添加的NiFe氧化物,使得在波动功率下可实现长期性水氧化的混合途径
Suwen Wang1, Binbin Lin1, Menghui Qi1
1Advanced Materials and Catalysis Group, Zhejiang Key Laboratory of Low-Carbon Synthesis of Value-Added Chemicals, State Key Laboratory of Clean Energy Utilization, Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China.
ACS nano
|August 28, 2025
概括
我们开发了一种用替代的铁层双氧化物 (NiFe-Ce LDH) 催化剂, 这种先进的材料在波动的能源条件下稳定运行,
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 有效的水氧化对于可持续的生产至关重要.
- 铁层双氧化物 (NiFe-LDH) 是有前途的电催化剂,但需要进一步优化.
- 了解反应机制是设计更好的催化剂的关键.
研究的目的:
- 开发一种新的替代NiFe-LDH (NiFe-Ce LDH) 催化剂.
- 研究吸附物演化机制 (AEM) 和局部氧机制 (LOM) 的协同激活.
- 评估催化剂对性水的氧化性能和稳定性.
主要方法:
- 合成替代的NiFe-LDH.
- 在现场减弱总反射表面增强红外吸收光谱 (ATR-SEIRAS).
- 微分电化学质谱法 (DEMS).
- 在性介质和膜电极组件 (MEA) 电解剂中进行电化学测试.
主要成果:
- NiFe-Ce LDH通过Ce 4f-O 2p相互作用协同激活AEM和LOM.
- 原子Ce的结合稳定了Fe位点,并实现了受控的晶格氧氧化还原.
- 证实同时形成OOH和OO*中间体,表明混合途径.
- 优化的催化剂在10 mA cm2和500 mA cm2的电压下达到220 mV的超电位,持续650小时.
- MEA电解器显示稳定的20A运行超过800小时,电压增加最小.
- 在模拟的风力电压波动下,催化剂表现稳定.
结论:
- NiFe-Ce LDH 是一种高效且稳定的水氧化电催化剂.
- 通过Ce替代激活的混合AEM-LOM通路有效增强催化活性.
- 催化剂在动态可再生能源环境中显示出可持续生产的巨大潜力.
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