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氧-燃料燃烧技术在国外玻璃行业中的应用 被引量:2
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作者 谢峻林 何峰 《国外建材科技》 1996年第3期8-12,共5页
氧-燃料燃烧技术以其高效节能减少污染的绝对优势在国外玻璃行业中得到广泛应用。本文综合介绍了世界各国应用此项技术的状况,并提出目前有待解决的问题,仅供我国玻璃同行参考借鉴。
关键词 氧-燃料燃烧 玻璃熔窑 节能 污染 粉尘 NDx
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氧-燃料燃烧气氛下木屑与聚氯乙烯焚烧时的重金属迁移特性
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作者 吴振东 马晓茜 +2 位作者 郑伟华 柯春成 唐玉婷 《可再生能源》 CAS 北大核心 2018年第9期1265-1270,共6页
文章在管式炉中开展燃烧实验,采用ICP-OES技术测试灰渣中的重金属含量,研究在氧-燃料燃烧气氛下木屑与聚氯乙烯(PVC)单独燃烧和混合燃烧过程中重金属的迁移规律,以及在此燃烧条件下有机氯(PVC)与无机氯(NaCl)对重金属迁移特性的影响。... 文章在管式炉中开展燃烧实验,采用ICP-OES技术测试灰渣中的重金属含量,研究在氧-燃料燃烧气氛下木屑与聚氯乙烯(PVC)单独燃烧和混合燃烧过程中重金属的迁移规律,以及在此燃烧条件下有机氯(PVC)与无机氯(NaCl)对重金属迁移特性的影响。研究结果表明:在氧-燃料燃烧气氛下,重金属熔沸点和燃烧温度决定了垃圾组分焚烧过程中重金属的迁移特性;与常规空气燃烧气氛相比,氧-燃料燃烧气氛提高了Pb和Zn的挥发率,降低了Cr的挥发率;木屑与PVC的混烧质量比为5∶5时,混烧对重金属挥发的促进作用要低于质量比例为7∶3和3∶7时;在氧-燃料燃烧气氛下,有机氯对Pb挥发的促进作用大于无机氯。 展开更多
关键词 氧-燃料燃烧 木屑 聚氯乙烯 重金属 迁移特性
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斯特林发动机燃烧室氧-柴油无焰燃烧的数值研究 被引量:6
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作者 叶拥拥 兰健 +2 位作者 吕田 顾根香 刘佳伟 《舰船科学技术》 北大核心 2016年第10期84-88,98,共6页
对斯特林发动机燃烧室氧-柴油无焰燃烧进行数值模拟。研究表明:氧-柴油无焰燃烧相比于传统氧-燃料燃烧需要卷吸更多的烟气来对纯氧进行稀释。直流燃烧室和旋流燃烧室内实现无焰燃烧的引射比分别为32和11.5,旋流燃烧室有助于无焰燃烧的... 对斯特林发动机燃烧室氧-柴油无焰燃烧进行数值模拟。研究表明:氧-柴油无焰燃烧相比于传统氧-燃料燃烧需要卷吸更多的烟气来对纯氧进行稀释。直流燃烧室和旋流燃烧室内实现无焰燃烧的引射比分别为32和11.5,旋流燃烧室有助于无焰燃烧的实现。氧-柴油无焰燃烧的火焰峰值温度比传统燃烧模式低600 K左右,火焰峰值温度大幅下降。氧-燃料模式下燃烧室温度变化在20%以上,而氧-柴油无焰燃烧模式下温度变化小于15%,燃烧室温度均匀性显著提高。 展开更多
关键词 斯特林发动机 氧-燃料燃烧 数值模拟
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Series Reports from Professor Wei's Group of Chongqing University:Advancements in Electrochemical Energy Conversions(1/4):Report 1:High-performance Oxygen Reduction Catalysts for Fuel Cells
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作者 Fa-Dong Chen Zhuo-Yang Xie +5 位作者 Meng-Ting Li Si-Guo Chen Wei Ding Li Li Jing Li Zi-Dong Wei 《电化学(中英文)》 CAS 北大核心 2024年第7期1-27,共27页
Two major challenges,high cost and short lifespan,have been hindering the commercialization process of lowtemperature fuel cells.Professor Wei's group has been focusing on decreasing cathode Pt loadings without lo... Two major challenges,high cost and short lifespan,have been hindering the commercialization process of lowtemperature fuel cells.Professor Wei's group has been focusing on decreasing cathode Pt loadings without losses of activity and durability,and their research advances in this area over the past three decades are briefly reviewed herein.Regarding the Pt-based catalysts and the low Pt usage,they have firstly tried to clarify the degradation mechanism of Pt/C catalysts,and then demonstrated that the activity and stability could be improved by three strategies:regulating the nanostructures of the active sites,enhancing the effects of support materials,and optimizing structures of the three-phase boundary.For Pt-free catalysts,especialiy carbon-based ones,several strategies that they proposed to enhance the activity of nitrogen-/heteroatom-doped carbon catalysts are firstly presented.Then,an indepth understanding of the degradation mechanism for carbon-based catalysts is discussed,and followed by the corresponding stability enhancement strategies.Also,the carbon-based electrode at the micrometer-scale,faces the challenges such as low active-site density,thick catalytic layer,and the effect of hydrogen peroxide,which require rational structure design for the integral cathodic electrode.This review finally gives a brief conclusion and outlook about the low cost and long lifespan of cathodic oxygen reduction catalysts. 展开更多
关键词 Fuel cell Oxygen reduction reaction Pt-based catalyst Carbon-based catalyst
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La_(0.8)M_(0.2)CrO_3(M=Ca,Mg,Sr)对硫—氧燃料电池催化性能的影响 被引量:2
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作者 朱伟长 孙颜刚 +3 位作者 俞海云 郑翠红 闫勇 卢异飞 《安徽工业大学学报(自然科学版)》 CAS 2010年第3期253-256,共4页
通过共沉淀法制备得到La_(0.8)M_(0.2)CrO_3(M=Ca,Mg,Sr)作为阳极催化剂,分别以钇稳定氧化锆(YSZ)粉体和La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)粉体作为硫—氧燃料电池的电解质材料和阴极材料。发现在700~800℃时,La_(0.8)Ca... 通过共沉淀法制备得到La_(0.8)M_(0.2)CrO_3(M=Ca,Mg,Sr)作为阳极催化剂,分别以钇稳定氧化锆(YSZ)粉体和La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)粉体作为硫—氧燃料电池的电解质材料和阴极材料。发现在700~800℃时,La_(0.8)Ca_(0.2)CrO_3对硫—氧燃料电池具有明显的催化效果,测得800℃时单电池开路电压为560 mV。La_(0.8)M_(0.2)CrO_3(M=Ca,Mg,Sr)作为硫—氧燃料电池的阳极催化剂,催化效果为:La_(0.8)Ca_(0.2)CrO_3>La_(0.8)Mg_(0.2)CrO_3>La_(0.8)Sr_(0.2)CrO_3。 展开更多
关键词 铬酸镧 -燃料电池 阳极
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氧—燃料燃烧器加热钢包钢水
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作者 Brunn.,M 周大恺 《湘钢译丛》 1991年第1期20-24,13,共6页
关键词 氧-燃料 燃烧器 钢包 钢水 加热
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在钢包内用氧—燃料加热钢水
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作者 徐长青 《钢铁译文集》 1990年第5期61-66,共6页
关键词 钢包炉 钢水 氧-燃料 加热
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氧─燃料烧咀提高电弧炉经济性
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作者 Martin,G 王怀宇 《舞钢译丛》 1993年第4期17-18,共2页
关键词 电弧炉 炼钢 氧-燃料烧咀 节能
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CH_(4)-O_(2)/H_(2)O(g)白云石煅烧与CO_(2)富集系统研究
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作者 房玉 蒋滨繁 夏德宏 《轻金属》 北大核心 2023年第1期47-53,共7页
白云石煅烧是皮江法炼镁的第一步,存在CO_(2)排放严重、能耗高等问题。为减少白云石煅烧工艺CO_(2)排放,创建了基于CH_(4)-O_(2)/H_(2)O(g)燃烧技术的白云石煅烧及其CO_(2)富集系统,可富集白云石分解和燃料燃烧产生的全部CO_(2),实现CO_... 白云石煅烧是皮江法炼镁的第一步,存在CO_(2)排放严重、能耗高等问题。为减少白云石煅烧工艺CO_(2)排放,创建了基于CH_(4)-O_(2)/H_(2)O(g)燃烧技术的白云石煅烧及其CO_(2)富集系统,可富集白云石分解和燃料燃烧产生的全部CO_(2),实现CO_(2)净零排放。通过Aspen plus建立系统换热网络,探究了系统热效率和火用效率随运行参数的变化,并分别以热效率最大和火用效率最大为目标对系统进行了优化。以单炉产能为150 t/d的白云石煅烧体系为例,该工艺CH_(4)燃烧量为5.184 mol/(kg-CaMg(CO_(3))_(2)),具有每年约460万吨的CO_(2)资源化回收潜力。热力学优化结果表明:当H_(2)O(g)掺入量为9.02 mol/(kg-CaMg(CO_(3))_(2))、CH_(4)燃烧温度为1592 K时,系统热效率最高为71.88%;当H_(2)O(g)掺入量为9.24 mol/(kg-CaMg(CO_(3))_(2))、CH_(4)燃烧温度为1673 K时,系统[火用]效率最高为51.93%。相较于传统白云石煅烧工艺,系统热效率、[火用]效率分别提高约8.28%、16.23%。 展开更多
关键词 白云石 煅烧 氧-燃料燃烧 热力学分析
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Na_2SO_4掺杂电解质对硫-氧SOFC性能的影响
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作者 吴鹏 朱伟长 +1 位作者 许苗苗 毛思萌 《电池》 CAS CSCD 北大核心 2013年第2期77-80,共4页
以Na2SO4掺杂8%Y2O3稳定的ZrO2(8YSZ)为复合电解质,La0.8Pr0.2CrO3、La0.7Sr0.3MnO3分别为阴、阳极催化剂,组装硫-氧固体氧化物燃料电池(SOFC)。使用硫蒸气作为燃料,测试了复合电解质的电化学性能。Na2SO4掺杂8YSZ复合电解质能提高SOFC... 以Na2SO4掺杂8%Y2O3稳定的ZrO2(8YSZ)为复合电解质,La0.8Pr0.2CrO3、La0.7Sr0.3MnO3分别为阴、阳极催化剂,组装硫-氧固体氧化物燃料电池(SOFC)。使用硫蒸气作为燃料,测试了复合电解质的电化学性能。Na2SO4掺杂8YSZ复合电解质能提高SOFC的电化学性能,其中25%Na2SO4-8YSZ的性能更好,在700℃时,具有最大开路电压833 mV;760℃时,达到最大电流密度168 mA/cm2;780℃时,达到最大功率密度127 mW/cm2。 展开更多
关键词 -固体化物燃料电池(SOFC) 复合电解质 硫酸钠(Na2SO4)
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Methanol Tolerant Non-noble Metal Co-C-N Catalyst for Oxygen Reduction Reaction Using Urea as Nitrogen Source 被引量:3
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作者 司玉军 陈昌国 +1 位作者 尹伟 蔡慧 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第3期331-334,I0002,共5页
A non-noble metal oxygen reduction reaction (ORR) catalyst labeled as Co-C-N(800) was synthesized by heat-treating a mixture of urea, cobalt chloride and acetylene black for 2 h at 800 ℃ in an inert nitrogen atmo... A non-noble metal oxygen reduction reaction (ORR) catalyst labeled as Co-C-N(800) was synthesized by heat-treating a mixture of urea, cobalt chloride and acetylene black for 2 h at 800 ℃ in an inert nitrogen atmosphere. X-ray diffraction pattern indicates that a metallic β-Co is generated after the heat-treating process. The results from cyclic voltammograms show that the obtained Co-C-N(800) catalyst has good ORR catalytic activity in 0.5 mol/L H2SO4 solution. The catalyst is also good at methanol tolerance and stability in the acidic solution. 展开更多
关键词 Direct methanol fuel ceil Oxygen reduction reaction CATALYST Non-noble metal Methanol resistance
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Recent developments in copper-based, non-noble metal electrocatalysts for the oxygen reduction reaction 被引量:6
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作者 杜诚 高小惠 陈卫 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第7期1049-1061,共13页
The high cost of Pt-based catalysts and the sluggish dynamics of the oxygen reduction reaction (ORR) severely hinder the rapid development of fuel cells, Therefore, the search for inexpensive, non-noble metal cataly... The high cost of Pt-based catalysts and the sluggish dynamics of the oxygen reduction reaction (ORR) severely hinder the rapid development of fuel cells, Therefore, the search for inexpensive, non-noble metal catalysts to substitute Pt-based catalysts has become a critical issue in the ORR research field, As an earth-abundant element, the use of Cu to catalyze the ORR has been explored with the ultimate target of finding a replacement for Pt-based catalysts in fuel cells. This review mainly focuses on recent research progress with Cu-based ORR catalysts and aims to aid readers' understanding of the status of development in this field. The review begins with a general update on the state of knowledge pertaining to ORR, This is followed by an overview of recent research based on Cu nanomaterial catalysts, which comprises Cu complexes, compounds, and other structures. Charting the development of Cu-based ORR catalysts shows that designing Cu-based materials to mimic active enzymes is an effective approach for ORR catalysis. By collecting recent developments in the field, we hope that this review will promote further development of Cu-based ORR catalysts and their application in fuel cells. 展开更多
关键词 CopperNon-noble metalElectrocatalysisOxygen reduction reactionFuel cell
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Modeling Study of Hydrogen/Oxygen and n-alkane/Oxygen Counterflow Diffusion Flames
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作者 汪小卫 蔡国飙 Vigor Yang 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2011年第2期231-238,I0004,共9页
A comprehensive analysis of hydrogen/oxygen and hydrocarbon/oxygen counterflow diffusion flames has been conducted using corresponding detailed reaction mechanisms. The hydrocarbon fuels contain n-alkanes from CH4 to ... A comprehensive analysis of hydrogen/oxygen and hydrocarbon/oxygen counterflow diffusion flames has been conducted using corresponding detailed reaction mechanisms. The hydrocarbon fuels contain n-alkanes from CH4 to C16H34. The basic diffusion flame structures are demonstrated, analyzed, and compared. The effects of pressure, and strain rate on the flame behavior and energy-release rate for each fuel are examined systematically. The detailed chemical kinetic reaction mechanisms from Lawrence Livermore National Laboratory (LLNL) are employed, and the largest one of them contains 2115 species and 8157 reversible reactions. The results indicate for all of the fuels the flame thickness and heat release rate correlate well with the square root of the pressure multiplied by the strain rate. Under the condition of any strain rate and pressure, H2 has thicker flame than hydrocarbons, while the hydrocarbons have the similar temperature and main products distributions and almost have the same flame thickness and heat release rate. The result indicates that the fuels composed with these hydrocarbons will still have the same flame properties as any pure n-alkane fuel. 展开更多
关键词 COUNTERFLOW Combustion HYDROGEN HYDROCARBON FLAME
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Influence of CO2 on Oxygen Surface Exchange Kinetics of Mixed- Conducting Ba0.5 Sr0.5 Co0.8 Feo.2O3_δ Oxide
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作者 宋春林 易建新 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2015年第2期203-205,I0002,共4页
The poisoning effect of CO2 on the oxygen surface exchange kinetics of BSCF (Ba0.5 Sr0.5 Co0.8 Feo.2O3_δ) is investigated with a novel pulse isotopic exchange technique. The surface exchange rate of BSCF severely d... The poisoning effect of CO2 on the oxygen surface exchange kinetics of BSCF (Ba0.5 Sr0.5 Co0.8 Feo.2O3_δ) is investigated with a novel pulse isotopic exchange technique. The surface exchange rate of BSCF severely decreases after in situ exposure to CO2, which is ascribed to carbonate formation on the material surface. The detrimental effect of CO2 starts at a low temperature of 375 ℃ and concentration as low as 1%, and becomes more pro- nounced at higher temperatures. Degradation of the surface exchange kinetics is associated with a rapid loss of oxygen permeation performance of BSCF in CO2. 展开更多
关键词 Surfaces Solid oxide fuel cells Oxygen separation Functional PEROVSKITE
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Enhanced ethanol electro-oxidation on CeO_2-modified Pt/Ni catalysts in alkaline solution 被引量:3
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作者 徐志花 饶丽霞 +3 位作者 宋海燕 严朝雄 张利君 杨水彬 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第2期305-312,共8页
Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2,and spontaneous Ni partial replacement by Pt processes.The as-prepared CeO2-modified Pt/Ni catalysts ... Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2,and spontaneous Ni partial replacement by Pt processes.The as-prepared CeO2-modified Pt/Ni catalysts showed enhanced catalytic performance for ethanol electro-oxidation compared with pure Pt/Ni,and acetate species were proposed to be the main products of the oxidation when using these catalysts.The content of CeO2 in the as-prepared catalysts influenced their catalytic activity,with Pt/NiCe2(obtained from an electrolyte containing 100 mg/L CeO2 nanoparticles) exhibiting higher activity and relatively better stability in ethanol electro-oxidation.This was mainly due to the oxygen storage capacity of CeO2,the interaction between Pt and CeO2/Ni,and the relatively small contact and charge transfer resistances.The results of this work thus suggest that electrocatalysts with low price and high activity can be rationally designed and produced by a simple route for use in direct ethanol fuel cells. 展开更多
关键词 Direct ethanol fuel cell Ethanol oxidation CeO2 nanoparticle Composite electrodeposition ELECTROCATALYST
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High-performance Pt catalysts supported on hierarchical nitrogen-doped carbon nanocages for methanol electrooxidation 被引量:5
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作者 蒋湘芬 王学斌 +5 位作者 沈丽明 吴强 王秧年 马延文 王喜章 胡征 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第7期1149-1155,共7页
Hierarchical nitrogen-doped carbon nanocages (hNCNC) with large specific surface areas were used as a catalyst support to immobilize Pt nanoparticles by a microwave-assisted polyol method. The Pt/hNCNC catalyst with... Hierarchical nitrogen-doped carbon nanocages (hNCNC) with large specific surface areas were used as a catalyst support to immobilize Pt nanoparticles by a microwave-assisted polyol method. The Pt/hNCNC catalyst with 20 wt% loading has a homogeneous dispersion of Pt nanoparticles with the average size of 3.3 nm, which is smaller than 4.3 and 4.9 nm for the control catalysts with the same loading supported on hierarchical carbon nanocages (hCNC) and commercial Vulcan XC-72, respec- tively. Accordingly, Pt/hNCNC has a larger electrochemical surface area than Pt/hCNC and Pt/XC-72. The Pt/hNCNC catalyst exhibited excellent electrocatalytic activity and stability for methanol oxidation, which was better than the control catalysts. This was attributed to the en- hanced interaction between Pt and hNCNC due to nitrogen participation in the anchoring function. By making use of the unique advantages of the hNCNC support, a heavy Pt loading up to 60 wt% was prepared without serious agglomeration, which gave a high peak-current density per unit mass of catalyst of 95.6 mA/mg for achieving a high power density. These results showed the potential of the Pt/hNCNC catalyst for methanol oxidation and of the new hNCNC support for wide applications. 展开更多
关键词 Methanol oxidationFuel cellsPlatinum catalystHierarchical nitrogen-doped carbon nanocagesHigh performance
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Ni doped La_(0.6)Sr_(0.4)FeO_(3-δ) symmetrical electrode for solid oxide fuel cells 被引量:1
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作者 马朝晖 孙春文 +3 位作者 马超 吴昊 占忠亮 陈立泉 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第8期1347-1353,共7页
The conventional Ni cermet anode suffers from severe carbon deposition and sulfur poisoning when fossil fuels are used. Alternative anode materials are desired for high performance hydrocarbon fuel solid oxide fuel ce... The conventional Ni cermet anode suffers from severe carbon deposition and sulfur poisoning when fossil fuels are used. Alternative anode materials are desired for high performance hydrocarbon fuel solid oxide fuel cells (SOFCs). We report the rational design of a very active Ni doped La0.6Sr0.4FeO3‐δ(LSFN) electrode for hydrocarbon fuel SOFCs. Homogeneously dispersed Ni‐Fe alloy nanoparticles were in situ extruded onto the surface of the LSFN particles during the operation of the cell. Sym‐metric SOFC single cells were prepared by impregnating a LSFN precursor solution onto a YSZ (yt‐tria stabilized zirconia) monolithic cell with a subsequent heat treatment. The open circuit voltage of the LSFN symmetric cell reached 1.18 and 1.0 V in humidified C3H8 and CH4 at 750??, respective‐ly. The peak power densities of the cells were 400 and 230 mW/cm2 in humidified C3H8 and CH4, respectively. The electrode showed good stability in long term testing, which revealed LSFN has good catalytic activity for hydrocarbon fuel oxidation. 展开更多
关键词 Solid oxide fuel cells Ni dopedLa0.6Sr0.4FeO3-δ Symmetrical electrode Hydrocarbon fuels
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Samaria-doped Ceria Modified Ni/YSZ Anode for Direct Methane Fuel in Tubular Solid Oxide Fuel Cells by Impregnation Method 被引量:1
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作者 张龙山 高建峰 +1 位作者 田瑞芬 夏长荣 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2009年第4期429-434,448,共7页
A porous NiO/yttria-stabilized zirconia was prepared by gel casting technique. anode substrate for tubular solid oxide fuel cells Nano-scale samaria-doped ceria (SDC) particles were formed onto the anode substrate t... A porous NiO/yttria-stabilized zirconia was prepared by gel casting technique. anode substrate for tubular solid oxide fuel cells Nano-scale samaria-doped ceria (SDC) particles were formed onto the anode substrate to modify the anode microstructure by the impregnation of solution of Sm(NO3)3 and Ce(NO3)3. Electrochemical impedance spectroscopy, current-voltage and current-powder curves of the cells were measured using an electrochemical workstation. Scanning electron microcopy was used to observe the microstructure. The results indicate that the stability of the performance of the cell operated on humidified methane can be significantly improved by incorporating the nano-structured SDC particles, compared with the unmodified cell. This verifies that the coated SDC electrodes are very effective in suppressing catalytic carbon formation by blocking methane from approaching the Ni, which is catalytically active towards methane pyrolysis. In addition, it was found that a small amount of deposited carbon is beneficial to the performance of the anode. The cell showed a peak power density of 225 mW/cm^2 when it was fed with H2 fuel at 700 ℃, but the power density increased to 400 mW/cm^2 when the fuel was switched from hydrogen to methane at the same flow rate. Methane conversion achieved about 90%, measured by gas chromatogram with a 10.0 mL/min flow rate of fuel at 700 ℃. Although the carbon deposition was not suppressed absolutely, some deposited carbon was beneficial for performance improvement. 展开更多
关键词 Tubular solid oxide fuel cell Gel casting IMPREGNATION METHANE
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A high performance non-noble metal electrocatalyst for the oxygen reduction reaction derived from a metal organic framework 被引量:6
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作者 白杨芝 衣宝廉 +4 位作者 李佳 蒋尚峰 张洪杰 邵志刚 宋玉江 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第7期1127-1133,共7页
The development of a non-precious metal electrocatalyst (NPME) with a performance superior to commercial Pt/C for the oxygen reduction reaction (ORR) is important for the commercialization of fuel cells. We report... The development of a non-precious metal electrocatalyst (NPME) with a performance superior to commercial Pt/C for the oxygen reduction reaction (ORR) is important for the commercialization of fuel cells. We report the synthesis of a NPME by heat-treating Co-based metal organic frameworks (ZIF-67) with a small average size of 44 nm. The electrocatalyst pyrolyzed at 600 ~C showed the best performance and the performance was enhanced when it was supported on BP 2000. The resulting electrocatalyst was composed of 10 nm Co nanoparticles coated by 3-12 layers of N doped graphite layers which as a whole was embedded in a carbon matrix. The ORR performance of the electrocatalyst was tested by rotating disk electrode tests in O2-saturated 0.1 mol/L KOH under ambient conditions. The electrocatalyst (1.0 mg/cm~] showed an onset potential of 1.017 V ([vs. RHE] and a half-wave potential of 0.857 V (vs. RHE], which showed it was as good as the commer- cial Pt/C (20 BgPt/cm2). Furthermore, the electrocatalyst possessed much better stability and re- sistance to methanol crossover than Pt/C. 展开更多
关键词 Fuel cellOxygen reduction reactionNon-precious metal catalystMetal organic frameworkAlkaline condition
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Hierarchically skeletal multi-layered Pt-Ni nanocrystals for highly efficient oxygen reduction and methanol oxidation reactions 被引量:6
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作者 Shibo Li Zhi Qun Tian +5 位作者 Yang Liu Zheng Jang Syed Waqar Hasan Xingfa Chen Panagiotis Tsiakaras Pei Kang Shen 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第4期648-657,共10页
Pt based materials are the most efficient electrocatalysts for the oxygen reduction reaction(ORR)and methanol oxidation reaction(MOR)in fuel cells.Maximizing the utilization of Pt based materials by modulating their m... Pt based materials are the most efficient electrocatalysts for the oxygen reduction reaction(ORR)and methanol oxidation reaction(MOR)in fuel cells.Maximizing the utilization of Pt based materials by modulating their morphologies to expose more active sites is a fundamental objective for the practical application of fuel cells.Herein,we report a new class of hierarchically skeletal Pt-Ni nanocrystals(HSNs)with a multi-layered structure,prepared by an inorganic acid-induced solvothermal method.The addition of H_(2)SO_(4)to the synthetic protocol provides a critical trigger for the successful growth of Pt-Ni nanocrystals with the desired structure.The Pt-Ni HSNs synthesized by this method exhibit enhanced mass activity of 1.25 A mgpt−1 at 0.9 V(versus the reversible hydrogen electrode)towards ORR in 0.1-M HClO_(4),which is superior to that of Pt-Ni multi-branched nanocrystals obtained by the same method in the absence of inorganic acid;it is additionally 8.9-fold higher than that of the commercial Pt/C catalyst.Meanwhile,it displays enhanced stability,with only 21.6%mass activity loss after 10,000 cycles(0.6–1.0 V)for ORR.Furthermore,the Pt-Ni HSNs show enhanced activity and anti-toxic ability in CO for MOR.The superb activity of the Pt-Ni HSNs for ORR and MOR is fully attributed to an extensively exposed electrochemical surface area and high intrinsic activity,induced by strain effects,provided by the unique hierarchically skeletal alloy structure.The novel open and hierarchical structure of Pt-Ni alloy provides a promising approach for significant improvements of the activity of Pt based alloy electrocatalysts. 展开更多
关键词 Hierarchically skeletal Pt-Ni NANOCRYSTALS SELF-ASSEMBLY Solvent thermal method Oxygen reduction reaction Methanol oxidation reaction Fuel cells ACTIVITY
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