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利用P204-正庚烷萃取体系制备纳米氧化氢氧化铁和氧化铁的研究 被引量:6
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作者 俞海云 孙思修 +3 位作者 林作栋 宋新宇 张卫民 樊唯镏 《无机化学学报》 SCIE CAS CSCD 北大核心 2004年第6期652-656,共5页
本文利用氨水皂化后P204-正庚烷体系,以不同的方式加入氢氧化钠,在水热条件下制备出了氧化氢氧化铁纳米棒和立方状纳米氧化铁,为纳米氧化氢氧化铁和氧化铁的制备提供了新途径.氧化氢氧化铁纳米棒宽约15~27 nm,长约100~250 nm,立方状... 本文利用氨水皂化后P204-正庚烷体系,以不同的方式加入氢氧化钠,在水热条件下制备出了氧化氢氧化铁纳米棒和立方状纳米氧化铁,为纳米氧化氢氧化铁和氧化铁的制备提供了新途径.氧化氢氧化铁纳米棒宽约15~27 nm,长约100~250 nm,立方状氧化铁粒径在80 nm左右.并对反应条件对产物的影响和生成机理进行了讨论. 展开更多
关键词 P204-正庚烷 萃取体系 纳米氧化氢氧化铁 聚四氟乙烯
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液相法合成单晶氧化氢氧化铁中空纳米棒
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作者 俞海云 孙思修 +1 位作者 宋新宇 印志磊 《功能材料》 EI CAS CSCD 北大核心 2007年第A06期2316-2319,共4页
选用壳聚糖为控制剂,采用两步法,在醇/水体系中成功得到了具有中空结构的β-FeOOH单晶纳米棒,得到的中空纳米棒长约70-110nm,直径20-30nm,内部空腔长约50-70nm,直径约10nm。通过SEM、TEM、XRD、IR、DSC-TG等分析手段对产物的形貌... 选用壳聚糖为控制剂,采用两步法,在醇/水体系中成功得到了具有中空结构的β-FeOOH单晶纳米棒,得到的中空纳米棒长约70-110nm,直径20-30nm,内部空腔长约50-70nm,直径约10nm。通过SEM、TEM、XRD、IR、DSC-TG等分析手段对产物的形貌和结构进行了表征,并对生成机理进行了讨论。 展开更多
关键词 氧化氢氧化铁 纳米棒 中空 溶解再结晶 胶体
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水热法制备纳米氧化铁的研究 被引量:6
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作者 杨旭 胡波 胡玲 《山东化工》 CAS 2010年第6期17-19,共3页
对水热法制备纳米氧化铁以及氧化氢氧化铁进行了研究。通过实验制得了多种不同形貌的纳米氧化铁以及纳米氧化氢氧化铁,利用X射线电子衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)对所得产物进行了表征,研究了反应时间、温度对... 对水热法制备纳米氧化铁以及氧化氢氧化铁进行了研究。通过实验制得了多种不同形貌的纳米氧化铁以及纳米氧化氢氧化铁,利用X射线电子衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)对所得产物进行了表征,研究了反应时间、温度对最终产物形貌、粒径的影响,对产物的变化规律进行了总结。 展开更多
关键词 氧化铁 氧化氢氧化铁 水热法
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通过β-FeOOH纳米棒无序聚集制备α-Fe_2O_3中空球 被引量:5
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作者 俞海云 陈国柱 +2 位作者 孙思修 印志磊 宋新宇 《无机化学学报》 SCIE CAS CSCD 北大核心 2007年第12期2115-2118,共4页
近年来.纳米材料的制备研究中的热点之一是各种中空独立几何结构的构筑^[1],这是由于中空结构除了可用来构建复杂结构量子器件外,还具有比表面积大、密度低和稳定性好等特点,因此在光子器件、药物载体、材料封装和催化剂载体等方面也... 近年来.纳米材料的制备研究中的热点之一是各种中空独立几何结构的构筑^[1],这是由于中空结构除了可用来构建复杂结构量子器件外,还具有比表面积大、密度低和稳定性好等特点,因此在光子器件、药物载体、材料封装和催化剂载体等方面也有着广泛的应用嘲。通过严格控制液相体系条件, 展开更多
关键词 氧化铁 氧化氢氧化铁 中空 溶剂热 无序聚集
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针状α-FeOOH微粒的成长规律 被引量:3
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作者 岳天仪 欧阳柬 +1 位作者 陈龙武 陈隽 《应用化学》 CAS CSCD 北大核心 1994年第2期53-56,共4页
通过酸性法制备了针状α-FeOOH微粒,并考察了Fe ̄(2+)浓度、pH值、温度和反应时间等对α-FeOOH微粒平均长度的影响。
关键词 针状微料 氧化氢氧化铁 成长规律
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Synthesis and characterization of colored layered double hydroxides for thermal stabilizer 被引量:1
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作者 刘循军 张玉超 +1 位作者 王娟 雷立旭 《Journal of Southeast University(English Edition)》 EI CAS 2015年第4期566-571,共6页
Colored layered double hydroxides (LDHs) can be synthesized by introducing colored cations such as Fe^3+ and Cr^3 +, which call be used as thermal stabilizers for polyvinyl chloride (PVC). The yellowish Mg/Fe an... Colored layered double hydroxides (LDHs) can be synthesized by introducing colored cations such as Fe^3+ and Cr^3 +, which call be used as thermal stabilizers for polyvinyl chloride (PVC). The yellowish Mg/Fe and bluish Mg/Cr LDHs are prepared by the co-precipitation method. The results show that the MgsCr_ CO3 and Mg3Fe_ CO3 colored layered double hydroxides can stabilize PVC for more than 30 min under the thermal aging temperature of 180 ℃. The preparation can use cheap Mg(OH) 2 instead of MgCl2, which produces a much smaller amount of the by-product NH4Cl. It is known that NH4Cl is a cheap fertilizer that is difficult to sell; therefore, the preparation is much greener and more economic than the one using magnesium salt. 展开更多
关键词 colored layered double hydroxides magnesiumhydroxide ferric chloride chromic chloride thermalstabilizer polyvinyl chloride
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Unveiling the active sites of ultrathin Co-Fe layered double hydroxides for the oxygen evolution reaction 被引量:2
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作者 Xue Bai Zhiyao Duan +3 位作者 Bing Nan Liming Wang Tianmi Tang Jingqi Guan 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第8期2240-2248,共9页
Two-dimensional layered double hydroxides(LDHs)have been identified as promising electrocatalysts for the oxygen evolution reaction(OER);however,the simple and effective synthesis of high-quality LDHs remains extremel... Two-dimensional layered double hydroxides(LDHs)have been identified as promising electrocatalysts for the oxygen evolution reaction(OER);however,the simple and effective synthesis of high-quality LDHs remains extremely challenging and the active sites have not been clarified.Herein,we report a facile solution-reaction method for preparing an ultrathin(thickness<2 nm)nonprecious CoFe-based LDH.Co_(1)Fe_(0.2) LDH delivers a current density of 10 mA cm^(-2) and a high turnover frequency of 0.082 s^(-1) per total 3d metal atoms at a low overpotential of 256 mV.Its mass activity is 277.9 A g^(-1) at an overpotential of 300 mV for the OER.Kinetic studies reveal the Co site as the main active center for the OER.The doped Fe lowers the reaction barrier by accelerating the charge-transfer process.Theoretical calculations reveal that the surface Co sites adjacent to Fe atoms are the active centers for the OER and the subsurface Fe dopants excessively weaken the OH^(*)adsorption,thus increasing the energy barrier of the rate-determining step.This study can guide the rational design of high-performance CoFe-based LDHs for water splitting. 展开更多
关键词 Cobalt hydroxide Iron hydroxide Layered double hydroxide Oxygen evolution reaction First-principle study
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Study on Kinetics of Iron Oxide Reduction by Hydrogen 被引量:11
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作者 HOU Baolin ZHANG Haiying +1 位作者 LI Hongzhong ZHU Qingshan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第1期10-17,共8页
Kinetics parameters of iron oxide reduction by hydrogen were evaluated by the isothermal method in a differential micro-packed bed. Influence of external diffusion, internal diffusion and heat transfer on the intrinsi... Kinetics parameters of iron oxide reduction by hydrogen were evaluated by the isothermal method in a differential micro-packed bed. Influence of external diffusion, internal diffusion and heat transfer on the intrinsic reaction rate was investigated and the conditions free of internal and external diffusion resistance have been determined. In the experiments, in order to correctly evaluate the intrinsic kinetics parameters for reducing Fe203 to Fe3O4, the reaction temperatures were set between 440 ℃ and 490 ℃. However, in order to distinguish the reduction of Fe304 to FeO from that of FeO to Fe, the reaction temperature in the experiment was set to be greater than 570 ℃. Intrinsic kinetics of iron oxide reduction by hydrogen was established and the newly established kinetic models were validated by the experimental data. 展开更多
关键词 isothermal method reduction kinetics iron oxide packed bed hydrogen reduction
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Ni(OH)_(2)quantum dots as a stable cocatalyst modifiedα-Fe_(2)O_(3) for enhanced photoelectrochemical water-splitting 被引量:2
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作者 Jiayue Rong Zhenzhen Wang +3 位作者 Jiaqi Lv Ming Fan Ruifeng Chong Zhixian Chang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第11期1999-2009,共11页
Depositing a cocatalyst has proven to be an important strategy for improving the photoelectrochemical(PEC)water-splitting efficiency of photoanodes.In this study,Ni(OH)2 quantum dots(Ni(OH)2 QDs)were deposited in situ... Depositing a cocatalyst has proven to be an important strategy for improving the photoelectrochemical(PEC)water-splitting efficiency of photoanodes.In this study,Ni(OH)2 quantum dots(Ni(OH)2 QDs)were deposited in situ onto anα-Fe_(2)O_(3)photoanode via a chelation-mediated hydrolysis method.The photocurrent density of the Ni(OH)2 QDs/α-Fe_(2)O_(3)photoanode reached 1.93 mA·cm^(−2)at 1.23 V vs.RHE,which is 3.5 times that ofα-Fe_(2)O_(3),and an onset potential with a negative shift of ca.100 mV was achieved.More importantly,the Ni(OH)2 QDs exhibited excellent stability in maintaining PEC water oxidation at a high current density,which is attributed to the ultra-small crystalline size,allowing for the rapid acceptance of holes fromα-Fe_(2)O_(3)to Ni(OH)_(2)QDs,formation of active sites for water oxidation,and hole transfer from the active sites to water molecules.Further(photo)electrochemical analysis suggests that Ni(OH)_(2)QDs not only provide maximal active sites for water oxidation but also suppress charge recombination by passivating the surface states ofα-Fe_(2)O_(3),thereby significantly enhancing the water oxidation kinetics over theα-Fe_(2)O_(3)surface. 展开更多
关键词 Photoelectrochemical water splitting α-Fe_(2)O_(3) COCATALYST Ni(OH)_(2) Quantum dots
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