论文标题
通过引入Mn氧化
Stabilization of Co oxide during oxygen evolution in alkaline media by the introduction of Mn oxide
论文作者
论文摘要
通过材料设计提高电催化剂对氧气演化反应（OER）的稳定性比改善其催化活性的关注较少。我们通过比较碱性溶液中含有Na的Coox和（CO0.7MN0.3）的OX膜来探讨了MN添加到氧化钴中稳定催化剂的效果。使用X射线吸收光谱（XAS）将获得的无序膜分为分层氧化物。通过氧气检测证实，在循环过程中催化活性的催化活性持续降低，而（CO0.7MN0.3）的氧气量略有增加，如用电化学指标所测量的。这些趋势是根据对金属氧化态的XAS分析合理化的，金属氧化态在循环后靠近表面的CO2.8+和Mn3.7+。因此，将MN添加到Coox中，成功稳定了催化剂材料及其在OER循环过程中的活性。稳定方法的发展对于延长OER催化剂的耐用性至关重要。
Improving the stability of electrocatalysts for the oxygen evolution reaction (OER) through materials design has received less attention than improving their catalytic activity. We explored the effect of Mn addition to a cobalt oxide for stabilizing the catalyst by comparing Na-containing CoOx and (Co0.7Mn0.3)Ox films electrodeposited in alkaline solution. The obtained disordered films were classified as layered oxides using X-ray absorption spectroscopy (XAS). The CoOx films showed a constant decrease in the catalytic activity during cycling, confirmed by oxygen detection, while that of (Co0.7Mn0.3)Ox slightly increased as measured by electrochemical metrics. These trends were rationalized based on XAS analysis of the metal oxidation states, which were Co2.8+ and Mn3.7+ near the surface after cycling. Thus, adding Mn to CoOx successfully stabilized the catalyst material and its activity during OER cycling. The development of stabilization approaches is essential to extend the durability of OER catalysts.
