通过在现场生成的Mn3+ 引发双金属氧机制以增强酸性氧的进化
Jianyun Liu1, Tanyuan Wang1, Mingzi Sun2
1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
一种新型的银氧化物 (Ag/MnO) 异构催化剂可显著增强酸性条件下的氧化演化反应 (OER). 这种非/催化剂在质子交换膜水电解器中表现出显著的稳定性和性能.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 在质子交换膜水电解器 (PEMWE) 中,高性能非贵金属催化剂对于酸氧演化反应 (OER) 是至关重要的.
- 目前的催化剂经常面临活动,稳定性和成本方面的挑战,这限制了PEMWE的效率.
研究的目的:
- 在酸性介质中开发一种新型,高性能,非/催化剂,用于氧化演化反应 (OER).
- 研究Ag/MnO异构结构的结构和电子特性,以提高OER活动和稳定性.
主要方法:
- 在氧化物 (MnO) 纳米棒 (Ag/MnO) 异构结构上加载银纳米粒子 (Ag) 的合成.
- 在0.5M H2SO4中对OER性能进行电化学表征.
- 运行X射线吸收光谱 (XAS) 和理论计算 (DFT) 来阐明反应机制和稳定性.
主要成果:
- 对于酸性溶液中的OER,Ag/MnO催化剂在10 mA cm−2时达到196 mV的超电位.
- 在PEMWE中经过300多小时的200 mA cm-2的运行证明了极好的稳定性.
- 操作XAS和DFT计算显示,微量Ag促进Mn3+-O位点与氧空缺,使双金属位点格子氧介导通路并抑制Mn溶解.
结论:
- Ag/MnO异构是迄今为止关于酸性应用的最好的非铁/OER催化剂之一.
- 通过激活晶格氧和抑制金属溶解,Ag和MnO之间的协同作用增强了OER动力学和结构稳定性.
- 这种催化剂设计为通过PEMWE实现成本效益高效的生产提供了有前途的途径.
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