Carbonaceous Hydrogen Evolution Catalyst Containing Cobalt Surrounded by Tuned Local Structure
Carbonaceous Hydrogen Evolution Catalyst Containing Cobalt Surrounded by Tuned Local Structure
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被调整的局部结构包围的含钴碳质析氢催化剂
DOI：
10.1002/cctc.201402253
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发表时间：
2014
期刊：
影响因子：
4.5
通讯作者：
Yoshiharu Uchimoto
中科院分区：
文献类型：
--
作者：
Jun Maruyama;Tsutomu Ioroi;Takahiro Hasegawa;Takuya Mori;Yuki Orikasa;Yoshiharu Uchimoto
无贵金属催化剂在酸性介质中的低活性和耐久性是阻碍其实际应用的主要问题。这项研究报告称，通过使用质子交换膜（PEM），用于水电解槽中析氢反应的含钴碳质催化剂的活性显着增强，质子交换膜是一种适用于间歇性可再生能源的高效能量转换装置。根据X射线吸收近边缘结构，活性的增强归因于Co原子周围局部结构的变化。采用优化结构和Co表面浓度的催化剂形成的PEM水电解槽在1 A cm−2时的焓效率为80 %。
The low activity and durability of noble‐metal‐free catalysts in acidic media are major problems that hinder their practical use. This study reports significantly enhanced activity of a cobalt‐containing carbonaceous catalyst used for the hydrogen‐evolution reaction in a water electrolyzer by using a proton‐exchange membrane (PEM), which is an efficient energy‐conversion device that is suitable for intermittent renewable energy sources. On the basis of X‐ray absorption near‐edge structure, the enhancement in activity was attributed to a change in the local structure surrounding the Co atom. The PEM water electrolyzer formed by using the catalyst with an optimized structure and Co surface concentration showed an enthalpy efficiency of 80 % at 1 A cm−2.