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无掺杂石墨碳封装Fe_(3)C纳米颗粒的制备及其氧还原性能
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作者 于鑫浩 武军 +5 位作者 于巾媛 王德强 何佳艺 胡静 谷俐 曹雪波 《Journal of Central South University》 SCIE EI CAS CSCD 2023年第1期35-48,共14页
近年来,含氮金属碳化物氧还原反应(ORR)催化剂被广泛报道,但受到Fe_(x)N、N_(x)C和Fe纳米颗粒等多种反应活性位点的干扰,Fe_(3)C在催化过程中的具体作用尚不清楚。本文以Fe_(2)O_(3)纳米微球和细菌纤维素(BC)为原料,经热解得到了一种Fe_... 近年来,含氮金属碳化物氧还原反应(ORR)催化剂被广泛报道,但受到Fe_(x)N、N_(x)C和Fe纳米颗粒等多种反应活性位点的干扰,Fe_(3)C在催化过程中的具体作用尚不清楚。本文以Fe_(2)O_(3)纳米微球和细菌纤维素(BC)为原料,经热解得到了一种Fe_(3)C/C核壳催化剂。虽然被封装的无氮Fe_(3)C颗粒不接触电解液,但BC碳化后形成石墨层的ORR催化活性得到大幅提升。石墨层保护了内部碳化物,使其在酸性和碱性电解液中均表现出良好的催化活性和稳定性。该催化剂可作为理解此类无杂元素封装型催化剂ORR活性位点的模型系统。本文提出的碳化物催化剂及其作用机理为ORR催化剂的开发提供了新的思路。 展开更多
关键词 碳化铁 非贵金属电极催化剂 纳米结构 细菌纤维素 氧还原反应
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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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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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