An Efficient Family of Misfit-Layered Calcium Cobalt Oxide Catalyst for Oxygen Evolution Reaction
An Efficient Family of Misfit-Layered Calcium Cobalt Oxide Catalyst for Oxygen Evolution Reaction
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DOI：
10.1002/admi.201801281
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发表时间：
2018-12-07
影响因子：
5.4
通讯作者：
Wang, Jian-Qiang
中科院分区：
文献类型：
--
作者：
Lin, Xiao;Bao, Hongliang;Wang, Jian-Qiang
析氧反应（OER）较差的动力学是水基氢燃料开发中需要克服的一个相当大的障碍。需要对使用地球丰富元素的 OER 催化剂进行研究，以实现理想的催化效率。在此，合成并研究了一系列错配层状钴酸钙和过渡金属（Mn、Fe 和 Cu）掺杂化合物，以评估它们在碱性环境中作为 OER 催化剂的潜力。研究发现，Ca3Co4O9 OER活性可以通过Fe的掺入得到显着提高，在10 mA cm(-2)电流密度下表现出低过电势(331 mV)，塔菲尔斜率小至52 mV dec(-1)，并且在1 M KOH碱性溶液中电解>100 h具有优异的长期稳定性。此外，所有使用的材料都使用各种表征技术进行了系统研究，从而提高了活性，这归因于导电性的增强、Co（III）和Co（IV）的优化比例以及Fe与Co之间的协同效应。
The oxygen evolution reaction's (OER) poor kinetics is a considerable obstacle to overcome in the development of water-derived hydrogen fuel. Research into OER catalysts using earth abundant elements is required to achieve desirable catalytic efficiency. Herein, a selection of misfit-layered calcium cobaltite and transition metal (Mn, Fe, and Cu)-doped compounds are synthesized and investigated in order to evaluate their potential as OER catalysts in an alkaline environment. It is discovered that Ca3Co4O9 OER activity may be substantially improved through incorporation of Fe, exhibiting low overpotential (331 mV) at 10 mA cm(-2) current density, small Tafel slope of 52 mV dec(-1), and an exceptional long-term stability of electrolysis in 1 M KOH alkaline solution >100 h. Moreover, all materials used are systematically studied using a variety of characterization techniques, resulting in enhanced activity, which is attributed to the enhanced electrical conductivity, and optimized proportion of Co (III) and Co (IV), as well as the synergistic effect between Fe with Co.