工程格子 氧气再生 NiFe分层双氧化物 增强氧气进化催化 耐用性
Fengyu Wu1, Fenyang Tian1, Menggang Li1
1State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
Angewandte Chemie (International ed. in English)
|October 25, 2024
概括
我们开发了一种NiFe氧化物/Ni4Mo合金电催化剂,以提高氧化演化反应 (OER) 的耐用性. 这种氧气策略通过平衡晶格氧气再生来提高催化剂的稳定性,这对于高效的水电解至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 在NiFe分层双氧化物 (NiFe-LDH) 中的格子氧机制 (LOM) 提供了高氧演化反应 (OER) 活性.
- 挑战包括由于频繁的晶格氧化物进化和缓慢的再生而导致活跃物种的溶解.
研究的目的:
- 为了提高OER的NiFe-LDH电催化剂的耐用性.
- 为了应对格子氧气再生和活性物种溶解的挑战.
主要方法:
- 构建一个NiFe氧化物/Ni4Mo合金 (NiFe-LDH/Ni4Mo) 异质连接电催化剂.
- 使用Ni4Mo合金作为"氧"供应中间体和电子.
- 现场光谱和第一原理模拟来研究该机制.
主要成果:
- NiFe-LDH/Ni4Mo催化剂在60小时内显著提高了耐用性,而仅使用NiFe-LDH的时间为10小时.
- 引入Ni4Mo增强了OH-吸附,促进了快速的晶格氧气再生.
- 使用NiFe-LDH/Ni4Mo的离子交换膜水电解器 (AEMWE) 在100 mA cm-2.2下显示了超过150小时的耐用性.
结论:
- 氧气的策略有效地平衡了晶格氧气的演变和再生,提高了OER催化剂的耐用性.
- NiFe-LDH/Ni4Mo异质连接是开发强大的电催化剂的有希望的方法.
- 这一战略为提高高效的OER催化剂的长期稳定性开辟了新的途径.
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