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面向多功能非贵金属电催化剂的构筑和微尺度解析 被引量:1
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作者 敬海峰 宇博 +6 位作者 周兴伟 刘尚 张彩 刘红艳 宋可心 邹旭 张伟 《表面技术》 EI CAS CSCD 北大核心 2021年第11期49-74,共26页
相对于贵金属电催化剂制作成本高、地球储量稀少、电化学稳定性低等缺点,制备廉价、能量转换效率高、使用寿命长、环境友好的非贵金属电催化剂是推动能源存储和转换技术快速发展的重要途径。根据电催化过程中电催化析氢反应(Hydrogen Ev... 相对于贵金属电催化剂制作成本高、地球储量稀少、电化学稳定性低等缺点,制备廉价、能量转换效率高、使用寿命长、环境友好的非贵金属电催化剂是推动能源存储和转换技术快速发展的重要途径。根据电催化过程中电催化析氢反应(Hydrogen Evolution Reaction,HER)、电催化析氧反应(Oxygen Evolution Reaction,OER)及氧还原反应(Oxygen Reduction Reaction,ORR)这三个重要反应类型,概述了水裂解和燃料电池的电化学反应机制,同时归纳了单功能电催化剂、双功能电催化剂、多功能电催化剂及其他电化学材料的设计与制备方法、相互关系和各自功能特点。借助先进的电子显微技术,如扫描电子显微镜、原子力扫描电子显微镜、透射电子显微镜、X射线能谱仪、电子能量损失谱仪等对其微观结构进行表征,重点对其表面形貌、结构、内部成分、元素分布等相关信息进行解析。从提供更丰富的缺陷空位、潜在活性位点、优化界面相互作用、增大电化学比表面积、形成协同效应等方面,分析其在降低成本的同时,提高电催化剂的电导率、增强稳定性的相关机理,以期为非贵金属电催化剂的研究和推广应用提供新策略。 展开更多
关键词 非贵金属电催化剂 构筑化学 催化析氢反应 催化析氧反应 氧还原反应
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聚合物电解质燃料电池阴极非贵金属电催化剂 被引量:2
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作者 张新朋 蒋淇忠 马紫峰 《电源技术》 CAS CSCD 北大核心 2002年第3期180-181,共2页
为了开发替代聚合物电解质燃料电池 (PEFC)中用于阴极氧还原的贵金属催化剂 ,同时为了提高液体进料直接甲醇燃料电池 (LFDMFC)中阴极催化剂抗甲醇中毒性能 ,基于非贵金属的氧还原催化剂的研究开发工作大量展开 ,介绍了两类用于PEFC中阴... 为了开发替代聚合物电解质燃料电池 (PEFC)中用于阴极氧还原的贵金属催化剂 ,同时为了提高液体进料直接甲醇燃料电池 (LFDMFC)中阴极催化剂抗甲醇中毒性能 ,基于非贵金属的氧还原催化剂的研究开发工作大量展开 ,介绍了两类用于PEFC中阴极氧还原的非贵金属催化剂———N4 金属大环化合物催化剂和Chevrel相催化剂 ,包括催化剂制备方法、催化活性以及催化机理分析等。对LFDMFC抗甲醇中毒的阴极催化剂进行了分析 。 展开更多
关键词 聚合物解质 燃料 阴极 非贵金属电催化剂
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在酸性环境中非贵金属析氧反应电催化剂现状及发展趋势 被引量:3
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作者 冯敏 岳鑫 《材料研究与应用》 CAS 2023年第2期189-196,共8页
质子交换膜(PEM)电解水槽是最有前途的制氢技术之一,其阳极上发生的析氧反应(OER)的缓慢四电子过程决定了整体效率。因此,开发高活性且稳定的电催化剂用于酸性环境下的OER是一个长期的挑战。目前,PEM电解水槽中的阳极或电催化剂多使用... 质子交换膜(PEM)电解水槽是最有前途的制氢技术之一,其阳极上发生的析氧反应(OER)的缓慢四电子过程决定了整体效率。因此,开发高活性且稳定的电催化剂用于酸性环境下的OER是一个长期的挑战。目前,PEM电解水槽中的阳极或电催化剂多使用贵金属铱、钌及其氧化物,它们不仅在强酸性条件下表现出较差的稳定性,而且成本较高、地壳储量低,极大地阻碍了其商业化应用。因此,在酸性介质下,开发活性高,稳定性良好,价格低廉的非贵金属OER电催化剂对PEM电解槽的大规模应用具有重要的意义。综述了当前常见的各种非贵金属电催化剂,包括过渡金属氧化物、碳基材料和其他类型化合物,并对各类催化剂的优缺点进行了讨论,并提出了酸性OER非贵金属电催化剂的未来发展方向。 展开更多
关键词 质子交换膜(PEM)解水槽 析氧反应 非贵金属电催化剂 过渡金属氧化物 碳基纳米材料
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Mn掺杂Co_(3)O_(4)电催化剂的制备及析氧反应性能研究
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作者 黄楚蓉 岳鑫 《材料研究与应用》 CAS 2024年第2期235-240,共6页
氢能对于缓解能源危机和环境污染意义重大。电化学水分解过程中,阳极析氧反应(OER)作为能量转换装置的关键半反应,由于电子-质子转移形成了复杂的中间产物,导致动力学缓慢,限制了产氢速率。传统OER催化剂包括二氧化铱、二氧化钌等贵金属... 氢能对于缓解能源危机和环境污染意义重大。电化学水分解过程中,阳极析氧反应(OER)作为能量转换装置的关键半反应,由于电子-质子转移形成了复杂的中间产物,导致动力学缓慢,限制了产氢速率。传统OER催化剂包括二氧化铱、二氧化钌等贵金属,存在储量低、价格昂贵、稳定性差等缺点,因此设计开发高效、廉价的非贵金属OER催化剂是解决OER动力学缓慢问题的关键。尖晶石氧化物(AB_(2)O_(4))具有特殊的电子结构和优异的OER性能,并可通过杂元素原子掺杂进一步提高其OER性能,被认为是一种具有潜力的非贵金属电催化剂。采用一步水热法,合成了Mn掺杂Co_(3)O_(4)电催化剂Mn-Co_(3)O_(4),研究了其电催化性能和稳定性。结果表明,利用Mn原子的掺杂,构建了氧桥连的Mn-O-Co配位结构,通过协同耦合作用,提高了Mn-Co_(3)O_(4)的OER催化性能。制备的Mn-Co_(3)O_(4)催化剂表现出高效的催化活性,在电流密度10和100 mA·cm^(-2)下,其过电位分别为270和335 mV。Mn-Co_(3)O_(4)同时表现出快速的动力学性能,Tafel斜率低至74 mV·dec^(-1)。此外,Mn-Co_(3)O_(4)还具有优异的稳定性,在电流密度10 mA·cm^(-2)下可稳定保持40 h。本研究为开发高效的OER催化剂提供了思路。 展开更多
关键词 尖晶石氧化物 Co_(3)O_(4) Mn原子掺杂 一步水热法 阳极析氧反应 非贵金属电催化剂 催化活性 稳定性
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中性锌-空气电池的阴极非贵金属催化剂
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作者 盛况 杨孝昆 +2 位作者 余亮 邓中梁 易清风 《电源技术》 CAS 北大核心 2022年第2期119-122,共4页
采用中性或准中性溶液为电解质的锌-空气电池具有提高阳极锌稳定性并避免电解质溶液碳酸盐化的优点。开发新型非贵金属催化剂,使之在中性溶液中能有效催化氧还原反应(ORR),这将具有重要意义。通过总结近几年铁/钴/镍掺杂的碳氮复合物的... 采用中性或准中性溶液为电解质的锌-空气电池具有提高阳极锌稳定性并避免电解质溶液碳酸盐化的优点。开发新型非贵金属催化剂,使之在中性溶液中能有效催化氧还原反应(ORR),这将具有重要意义。通过总结近几年铁/钴/镍掺杂的碳氮复合物的制备、ORR活性测试以及应用于中性锌-空气电池的性能研究方面的主要工作成果,发现采用简单的热解法得到的具有管状结构的非贵金属掺杂的碳氮复合物可以成为中性锌-空气电池优异的阴极催化剂。 展开更多
关键词 锌-空气 氧还原反应 非贵金属电催化剂 碳纳米管
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Fe^(3+)协同Ni基金属-有机框架提升电催化析氧反应活性的研究
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作者 陈星亮 范文娟 +2 位作者 常会 黄海平 蒋志强 《无机盐工业》 CAS CSCD 北大核心 2024年第2期152-158,共7页
采用溶剂热法合成了金属-有机框架材料(phen-Ni),然后通过掺杂异金属Fe^(3+)制备了Fe@phen-Ni电催化剂。利用X射线单晶衍射仪、X射线光电子能谱仪、扫描电子显微镜和透射电子显微镜等对催化剂的物相、形貌及各成分化学状态进行表征。利... 采用溶剂热法合成了金属-有机框架材料(phen-Ni),然后通过掺杂异金属Fe^(3+)制备了Fe@phen-Ni电催化剂。利用X射线单晶衍射仪、X射线光电子能谱仪、扫描电子显微镜和透射电子显微镜等对催化剂的物相、形貌及各成分化学状态进行表征。利用线性扫描伏安法(LSV)和电化学阻抗谱(EIS)等研究了Fe@phen-Ni催化剂的电催化析氧(OER)性能。结果表明,当电流密度为10mA/cm^(2)时,Fe@phen-Ni的OER过电位为333mV,与phen-Ni相比显示出更优异的OER催化活性。Fe@phen-Ni电催化活性的提高归因于Fe^(3+)的引入,这不仅增加了电催化剂的活性位点,而且由于Fe^(3+)和Ni^(2+)的协同作用,促进了电子转移,从而提高了电催化活性。该工作不仅证实了异金属离子的掺杂有利于提高电催化析氧活性,而且为基于金属-有机框架材料制备电化学OER催化剂提供了新的思路。 展开更多
关键词 金属-有机框架 催化 析氧反应 非贵金属电催化剂
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氮硫共掺杂碳材料均匀担载核壳纳米颗粒Co@Co_(9)S_(8)作为氧还原催化剂的研究
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作者 宋金香 张传运 +1 位作者 袁志国 吴光平 《化工新型材料》 CAS CSCD 北大核心 2023年第S01期102-105,109,共5页
开发高效、稳定的非贵金属氧还原(ORR)催化剂是促进燃料电池商业化进程的关键。通过树脂衍生N、S共掺杂碳材料负载原位生成的Co@Co_(9)S_(8)核壳结构纳米颗粒,制备出一种具有良好活性和稳定的非贵金属催化剂Co@Co_(9)S_(8)/NSC。电化学... 开发高效、稳定的非贵金属氧还原(ORR)催化剂是促进燃料电池商业化进程的关键。通过树脂衍生N、S共掺杂碳材料负载原位生成的Co@Co_(9)S_(8)核壳结构纳米颗粒,制备出一种具有良好活性和稳定的非贵金属催化剂Co@Co_(9)S_(8)/NSC。电化学测试结果表明:Co@Co_(9)S_(8)/NSC催化剂的半波电位(E_(1/2))和极限电流密度可与商业Pt/C催化剂相媲美。同时相较商业Pt/C催化剂,其还具有极好的抗甲醇活性。此外,计时电流测试表明:持续老化10000s后,Co@Co_(9)S_(8)/NSC的电流密度保持了初始值的97.5%,远低于商业Pt/C催化剂的23.3%。为构建高活性高稳定性核壳结构ORR催化剂提供了新的思路,同时其思路也可以应用于其他新能源电极材料如Li-空气电池、Li-S电池及超级电容器等。 展开更多
关键词 核壳结构 非贵金属电催化剂 氧还原反应 燃料
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电沉积合成Ni-Fe(Co)/CF电催化剂及其催化性能 被引量:1
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作者 周熠铖 张翼婵 +1 位作者 刘剑文 吴王平 《电镀与涂饰》 CAS 北大核心 2022年第24期1786-1794,共9页
采用电化学合成技术在泡沫铜(CF)上制备镍铁(Ni-Fe)和镍钴(Ni-Co)合金薄膜作为析氢电催化剂。通过扫描电子显微镜和X射线能谱仪分析了催化剂的表面形貌和化学成分,并利用电化学测试技术探究了它们在1 mol/L KOH溶液中的电催化析氢活性... 采用电化学合成技术在泡沫铜(CF)上制备镍铁(Ni-Fe)和镍钴(Ni-Co)合金薄膜作为析氢电催化剂。通过扫描电子显微镜和X射线能谱仪分析了催化剂的表面形貌和化学成分,并利用电化学测试技术探究了它们在1 mol/L KOH溶液中的电催化析氢活性和耐久性。结果表明,Ni-Co/CF电催化剂聚集在一起形成了致密的薄膜,而Ni-Fe/CF电催化剂显示出沟壑状表面。两种合金薄膜催化剂的析氢反应动力学均由Volmer步骤控制。Ni-Co/CF电催化剂具有较大的电化学活性面积和良好的析氢性能,而Ni-Fe/CF电催化剂的析氢耐久性较好,两者的析氢稳定性均有待提升。 展开更多
关键词 泡沫铜 镍铁合金 镍钴合金 化学合成 非贵金属电催化剂 析氢反应
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moCNTs/PyPBI/Mela(Co)电催化剂的制备及性能研究 被引量:1
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作者 于书平 梁新凯 +3 位作者 朱红 杨文胜 韩克飞 汪中明 《北京化工大学学报(自然科学版)》 CAS CSCD 北大核心 2016年第5期14-21,共8页
采用溶液共混和高温热解两步法,以聚苯并咪唑(PyPBI)和三聚氰胺(Mela)为复合氮源,中度氧化的碳纳米管(moCNTs)为碳源,醋酸钴为金属源,制备出一系列moCNTs/PyPBI/Mela(Co)催化剂,对其进行TEM、TGA、XRD、XPS表征和电化学活性测试,结果表... 采用溶液共混和高温热解两步法,以聚苯并咪唑(PyPBI)和三聚氰胺(Mela)为复合氮源,中度氧化的碳纳米管(moCNTs)为碳源,醋酸钴为金属源,制备出一系列moCNTs/PyPBI/Mela(Co)催化剂,对其进行TEM、TGA、XRD、XPS表征和电化学活性测试,结果表明:当moCNTs/PyPBI(Co)前驱体与三聚氰胺的质量比为1∶2,热解温度为800℃时,催化剂的起始还原电位可达到0.87V(vs.RHE),接近于商业Pt20%/C催化剂。moCNTs/PyPBI/Mela(Co)催化剂催化性能的提高归因于其结构中的吡啶氮与钴结合形成Co-N活性位点,增加对O2的吸附能力,弱化了O—O键,促进氧分子的还原反应,促使ORR反应通过4e-途径进行。 展开更多
关键词 聚苯并咪唑 三聚氰胺 非贵金属电催化剂 氧还原反应 质子交换膜燃料
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Co_3O_4 nanoparticles assembled on polypyrrole/graphene oxide for electrochemical reduction of oxygen in alkaline media 被引量:3
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作者 任素贞 郭亚男 +6 位作者 马少博 毛庆 吴丹丹 杨莹 景洪宇 宋雪旦 郝策 《Chinese Journal of Catalysis》 EI CSCD 北大核心 2017年第7期1281-1290,共10页
The development of highly efficient catalysts for cathodes remains an important objective of fuel cell research. Here, we report Co3O4 nanoparticles assembled on a polypyrrole/graphene oxide electrocatalyst (C... The development of highly efficient catalysts for cathodes remains an important objective of fuel cell research. Here, we report Co3O4 nanoparticles assembled on a polypyrrole/graphene oxide electrocatalyst (Co3O4/Ppy/GO) as an efficient catalyst for the oxygen reduction reaction (ORR) in alkaline media. The catalyst was prepared via the hydrothermal reaction of Co2+ ions with Ppy-modified GO. The GO, Ppy/GO, and Co3O4/Ppy/GO were characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The incorporation of Ppy into GO nanosheets resulted in the formation of a nitrogen-modified GO po-rous structure, which acted as an efficient electron-transport network for the ORR. With further anchoring of Co3O4 on Ppy/GO, the as-prepared Co3O4/Ppy/GO exhibited excellent ORR activity and followed a four-electron route mechanism for the ORR in alkaline solution. An onset potential of -0.10 V vs. a saturated calomel electrode and a diffusion limiting current density of 2.30 mA/cm^2 were achieved for the Co3O4/Ppy/GO catalyst heated at 800 ℃; these values are comparable to those for noble-metal-based Pt/C catalysts. Our work demonstrates that Co3O4/Ppy/GO is highly active for the ORR. Notably, the Ppy coupling effects between Co3O4 and GO provide a new route for the preparation of efficient non-precious electrocatalysts with hierarchical porous structures for fuel cell applications. 展开更多
关键词 Non-precious metal electrocatalyst CO3O4 POLYPYRROLE Graphene Oxygen reduction reaction Proton-exchange membrane fuel cell
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Influence of counter electrode material during accelerated durability test of non-precious metal electrocatalysts in acidic medium 被引量:3
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作者 李佳 刘会园 +2 位作者 吕洋 郭新闻 宋玉江 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第7期1109-1118,共10页
Significant progress has been made in the development of non-precious metal electrocatalysts (NPMEs) during the past decade. Correspondingly, there is an urgent demand for an appropriate measurement method to be est... Significant progress has been made in the development of non-precious metal electrocatalysts (NPMEs) during the past decade. Correspondingly, there is an urgent demand for an appropriate measurement method to be established for the reliable evaluation of NPMEs. In this study, platinum and graphite counter electrodes were used to investigate the impact of counter electrode material on the accelerated durability testing (ADT) of NPMEs in acidic medium. Platinum used as the coun- ter electrode in a traditional three-electrode electrochemical cell was found to dissolve in acidic medium and re-deposit on NPME coated on the working electrode during ADT. Such re-deposition causes the oxygen reduction reaction (ORR) performance of NPMEs to remarkably improve, and thus will seriously mislead our judgment of NPMEs if we are unaware of it. The phenomenon can be avoided using a graphite counter electrode. 展开更多
关键词 Non-precious metal electrocatalystPlatinum counter electrodeGraphite counter electrodeAccelerated durability testAcid medium
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Ultrafine Ni-B nanoparticles for efficient hydrogen evolution reaction 被引量:2
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作者 Ting Huang Tao Shen +6 位作者 Mingxing Gong Shaofeng Deng Chenglong Lai Xupo Liu Tonghui Zhao Lin Teng Deli Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第12期1867-1873,共7页
The search for active,stable,and cost-effective electrocatalysts for hydrogen evolution reaction(HER)is desirable,but it remains a great challenge in the overall water splitting.Here,we report the synthesis of nickel ... The search for active,stable,and cost-effective electrocatalysts for hydrogen evolution reaction(HER)is desirable,but it remains a great challenge in the overall water splitting.Here,we report the synthesis of nickel boron nanoparticles supported on Vulcan carbon(Ni-B)via a simple,yet scalable,two-step chemical reduction–annealing strategy.The results of the electrochemical measurements suggest that the overpotentials of Ni-B-400 are 114 and 215 mV(in 1 mol L^–1 KOH)at current densities of 10 and 40 mA cm^?2,respectively,indicating an exceedingly good electrocatalytic activity in the HER.More importantly,Ni-B maintains a current density of 7.6 mA cm^-2 at an overpotential of 0.15 V for 20 h in the durability test.The excellent HER activity of Ni-B-400 is derived from the small particle size and the expanded lattice of Ni,which can optimize the hydrogen absorption energy and enhance the electrocatalytic properties. 展开更多
关键词 Ni-B Non-noble electrocatalyst Hydrogen evolution reaction Ultrafine nanoparticle Alkaline electrolyte
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Induced growth of Fe-N_x active sites using carbon templates 被引量:2
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作者 Shiming Zhang Heyou Zhang +3 位作者 Weimin Zhang Xianxia Yuan Shengli Chen Zi-Feng Ma 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第8期1427-1435,共9页
Highly active Fe-N_x sites that effectively improve the performance of non-precious metal electrocatalysts for oxygen reduction reactions(ORRs) are desirable. Herein, we propose a strategy for introducing a carbon t... Highly active Fe-N_x sites that effectively improve the performance of non-precious metal electrocatalysts for oxygen reduction reactions(ORRs) are desirable. Herein, we propose a strategy for introducing a carbon template into a melamine/Fe-salt mixture to inductively generate highly active Fe-N_x sites for ORR. Using 57 Fe M?sbauer spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction, we studied the structural composition of the Fe and N co-doped carbon catalysts.Interestingly, the results showed that this system not only converted inactive Fe and Fe-carbides into active Fe-N_4 and other Fe-nitrides, but also improved their intrinsic activities. 展开更多
关键词 Oxygen reductionreaction Non‐precious‐metalelectrocatalyst Fe‐NxInduced growth Carbon template
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Multi-dimensional hierarchical CoS_(2)@MXene as trifunctional electrocatalysts for zinc-air batteries and overall water splitting 被引量:8
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作者 Silin Han Yu Chen +9 位作者 Yanan Hao Yaoyi Xie Dengyu Xie Ying Chen Yixing Xiong Zhengyao He Feng Hu Linlin Li Jixin Zhu Shengjie Peng 《Science China Materials》 SCIE EI CAS CSCD 2021年第5期1127-1138,共12页
The demanding all-in-one electrocatalyst system for oxygen reduction reaction(ORR), oxygen evolution reaction(OER) and hydrogen evolution reaction(HER) in zinc-air batteries or water splitting requires elaborate mater... The demanding all-in-one electrocatalyst system for oxygen reduction reaction(ORR), oxygen evolution reaction(OER) and hydrogen evolution reaction(HER) in zinc-air batteries or water splitting requires elaborate material manufacturing, which is usually complicated and time-consuming.Efficient interface engineering between MXene and highly active electrocatalytic species(CoS_(2)) is, herein, achieved by an in situ hydrothermal growth and facile sulfurization process.The CoS_(2)@MXene electrocatalyst is composed by one-dimensional CoS_(2) nanowires and two-dimensional MXene nanosheets, which lead to a hierarchical structure(large specific surface area and abundant active sites), a spatial electron redistribution(high intrinsic activity), and high anchoring strength(superior performance stability). Therefore, the electrocatalyst achieves enhanced catalytic activity and longtime stability for ORR(a half-wave potential of 0.80 V), OER(an overpotential of 270 mV at 10 mA cm^(-2), i.e., η10= 270 mV)and HER(η10= 175 mV). Furthermore, the asymmetry water splitting system based on the CoS_(2)@MXene composites delivers a low overall voltage of 1.63 V at 10 mA cm^(-2). The solidstate zinc-air batteries using CoS_(2)@MXene as the air cathode display a small charge-discharge voltage gap(0.53 V at1 mA cm^(-2)) and superior stability(60 circles and 20-h continuous test). The energy interconversion between the chemical energy and electricity can be achieved by a self-powered system via integrating the water splitting system and quasisolid-state zinc-air batteries. Supported by in situ Raman analyses, the formation of cobalt oxyhydroxide species provides the active sites for water oxidation. This study paves apromising avenue for the design and application of multifunctional nanocatalysts. 展开更多
关键词 hierarchical structure sulfides multiple functionalities water splitting zinc-air batteries
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Recent advances in non-noble electrocatalysts for oxidative valorization of biomass derivatives 被引量:5
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作者 Ruixiang Ge Jing Li Haohong Duan 《Science China Materials》 SCIE EI CAS CSCD 2022年第12期3273-3301,共29页
Electrocatalysis is deemed as a promising approach for sustainable energy conversion and chemical production.Although a variety of cathode reactions(e.g.,hydrogen evolution and CO_(2)/N_(2)reduction)produce valuable f... Electrocatalysis is deemed as a promising approach for sustainable energy conversion and chemical production.Although a variety of cathode reactions(e.g.,hydrogen evolution and CO_(2)/N_(2)reduction)produce valuable fuels and chemicals,the extensively studied oxygen evolution reaction(OER)at anode only generates O_(2),which is not a high-value product.Substituting the OER with thermodynamically more favorable biomass derivative oxidation reactions(BDORs)not only enables energy-saving electrocatalysis,but also provides value-added anode products.Recent achievements have demonstrated that non-noble electrocatalysts are promising for BDORs.Herein,we provide a comprehensive review on recent achievements in the field of electrochemical BDORs catalyzed by non-noble catalysts.We start by summarizing the electrocatalytic oxidation of different types of biomass-derived substrates,aiming to show the advantages of the electrocatalytic pathway and to introduce the state-of-the-art non-noble catalysts.The reaction mechanisms of non-noble-material-catalyzed BDORs are then summarized and classified into three types according to the acceptor of hydrogen species during the dehydrogenation of biomass derivatives.Subsequently,discussions are devoted to the strategies for promoting the performances of non-noble electrocatalysts.Finally,we propose our opinions regarding future trends and major challenges in this field. 展开更多
关键词 biomass upgrading ELECTROOXIDATION non-noble electrocatalysts mechanism structure-performance relationship
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Melamine-assisted synthesis of ultrafine Mo_(2)C/Mo_(2)N@N-doped carbon nanofibers for enhanced alkaline hydrogen evolution reaction activity 被引量:6
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作者 Jing Chen Anqiang Pan +4 位作者 Wenchao Zhang Xinxin Cao Rou Lu Shuquan Liang Guozhong Cao 《Science China Materials》 SCIE EI CAS CSCD 2021年第5期1150-1158,共9页
Noble metal-free electrocatalysts with high activity are highly desirable for the large-scale application of hydrogen evolution reaction(HER). Mo_(2) C-based nanomaterials have been proved as a promising alternative t... Noble metal-free electrocatalysts with high activity are highly desirable for the large-scale application of hydrogen evolution reaction(HER). Mo_(2) C-based nanomaterials have been proved as a promising alternative to noble metal-based electrocatalysts owing to the Pt-resembled d-band density and optimal intermediates-adsorption properties.However, the aggregation and excessive growth of crystals often occur during their high-temperature synthesis procedure, leading to low catalytic utilization. In this study, the ultrafine Mo_(2) C/Mo_(2) N heterostructure with large surface and interface confined in the N-doped carbon nanofibers(NCNFs) was obtained by a melamine-assisted method. The synergistic effect of Mo_(2) C/Mo_(2) N heterostructure and plenty active sites exposed on the surface of ultrafine nanocrystals improves the electrocatalytic activity. Meanwhile, the N-CNFs ensure fast charge transfer and high structural stability during reactions. Moreover, the in-situ synthesis method strengthens the interfacial coupling interactions between Mo_(2)C/Mo_(2) N heterostructure and N-CNFs, further enhancing the electronic conductivity and electrocatalytic activity. Owing to these advantages, Mo_(2)C/Mo_(2) N@N-CNFs exhibit excellent HER performance with a low overpotential of 75 mV at a current density of 10 mV cm^(-2) in alkaline solution, superior to the single-phased Mo_(2)C counterpart and recently reported Mo_(2)C/Mo_(2) N-based catalysts. This study highlights a new effective strategy to design efficient electrocatalysts via integrating heterostructure, nanostructure and carbon modification. 展开更多
关键词 Mo2C hydrogen evolution reaction HETEROSTRUCTURE ULTRAFINE NANOFIBERS
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A highly-efficient oxygen evolution electrode based on defective nickel-iron layered double hydroxide 被引量:9
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作者 Xuya Xiong Zhao Cai +10 位作者 Daojin Zhou Guoxin Zhang Qian Zhang Yin Jia Xinxuan Duan Qixian Xie Shibin Lai Tianhui Xie Yaping Li Xiaoming Sun Xue Duan 《Science China Materials》 SCIE EI CSCD 2018年第7期939-947,共9页
Exploring efficient and cost-effective electro- catalysts for oxygen evolution reaction (OER) is critical to water splitting. While nickel-iron layered double hydroxide (NiFe LDH) has been long recognized as a pro... Exploring efficient and cost-effective electro- catalysts for oxygen evolution reaction (OER) is critical to water splitting. While nickel-iron layered double hydroxide (NiFe LDH) has been long recognized as a promising non- precious electrocatalyst for OER, its intrinsic activity needs further improvement. Herein, we design a highly-efficient oxygen evolution electrode based on defective NiFe LDH na- noarray. By combing the merits of the modulated electronic structure, more exposed active sites, and the conductive elec- trode, the defective NiFe LDH electrocatalysts show a low onset potential of 1.40 V (vs. RHE). An overpotential of only 200 mV is required for 10 mA cm-2, which is 48 mV lower than that of pristine NiFe-LDH. Density functional theory plus U (DFT+U) calculations are further employed for the origin of this OER activity enhancement. We find the introduction of oxygen vacancies leads to a lower valance state of Fe and the narrowed bandgap, which means the electrons tend to be ea- sily excited into the conduction band, resulting in the lowered reaction overpotential and enhanced OER performance. 展开更多
关键词 oxygen evolution reaction layered double hydroxide oxygen vacancy ELECTROCATALYSIS
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