解开氧化的压缩应变和氧空缺效应,用于质子交换膜水电解器
Meihuan Liu1,2, Xiaoyan Zhong1, Xiaoxia Chen1
1Key Laboratory of Light Energy Conversion Materials of Hunan Province College, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan, 410081, China.
Advanced materials (Deerfield Beach, Fla.)
|March 11, 2025
概括
具有压力应变和氧气空缺的工程二氧化催化剂可提高酸氧演化反应 (OER) 活性,用于水电解. 这一突破克服了质子交换膜水电解 (PEMWE) 装置的局限性.
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:
- 基于的电催化剂对于在质子交换膜水电解 (PEMWE) 中的酸氧演化反应 (OER) 至关重要.
- 介质结合的线性缩放关系 (LSR) 限制了这些催化剂的活性增强.
- 开发新的策略来克服LSR对于高效的PEMWE至关重要.
研究的目的:
- 设计基于二氧化 (IrO2) 的催化剂,具有压力应变和氧气空缺,以增强酸性OER活性.
- 调查压力和空缺对OER性能影响的潜在机制.
- 打破中间结合的LSR,以提高电催化剂效率.
主要方法:
- 兴奋剂工程策略,在IrO2.2中引入压缩应变和氧气空缺.
- 在现场同步子表征以阐明结构和电子性质.
- 理论计算 (例如,DFT) 以了解反应路径和电子调制.
- 质子交换膜水电解 (PEMWE) 装置的制造和测试.
主要成果:
- 压缩应变增强了Ir-O共价性,并减少了Ir-Ir键距离.
- 氧气空缺充当电子调节器,促进水吸附和中间合.
- 在压力应变/氧气空隙和OER电流之间观察到的火山形曲线.
- (Ni) 兴奋剂调节了Ir 5d和O 2p频段中心,促进了协同机制.
- T-0.24Ni/IrO2催化剂实现了 500 mA cm-2 的电流密度,经过 500 小时的稳定运行.
结论:
- 在IrO2中压缩应变和氧空缺是提高酸性OER活动的有效策略.
- 开发的金属位点-氧空缺协同机制 (MS-OvSM) 途径成功地打破了LSR.
- 工程IrO2催化剂显示出高性能和稳定的质子交换膜水电解的巨大潜力.
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