带有稳定氧气空缺的格子菌株促进了Ceria的稳健性气进化,超越了基准Pt的表现
Xiaojing Liu1, Shuaichong Wei1, Shuyi Cao1
1Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, China.
Advanced materials (Deerfield Beach, Fla.)
|June 12, 2024
概括
重型稀土 (Y) 和过渡金属 (Co) 双重兴奋剂增强了二氧化 (CeO2) 强大的性进化反应 (HER). 这一策略增强了催化活性和稳定性,表现优于白金.
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:
- 地球上丰富的金属氧化物通常是稳定的,但对于演化反应 (HER) 具有催化不活性.
- 这种惰性源于它们表面中介的吸附性差.
研究的目的:
- 开发一种策略,以增强性HER的二氧化 (CeO2) 的催化活性和稳定性.
- 调查与 (Y) 和 (Co) 双重兴奋剂对CeO2.2的协同效应.
主要方法:
- 使用 (Y) 和 (Co) 诱导格子应变并稳定CeO2.2中的氧空缺 (Ov) 的双策略.
- 描述Y,Co-CeO2电催化剂,分析其结构性,电子性和电化学性质.
- 在性HER和离子交换膜水电解器中测试电催化剂的性能.
主要成果:
- Y,Co-CeO2催化剂显著增强了 HER 动力学,这是由于改善了氧空位点的水分离和吸附.
- 催化剂在10 mA cm-2时显示了27 mV的超低HER超电位,Tafel斜率为48 mV dec-1.
- Y,Co-CeO2电催化剂表现出极好的稳定性,在离子交换膜水电解器中在600 mA cm-2下运行了500小时.
结论:
- 协同的格子应变和氧空位稳定策略有效地提高了CeO2的强性HER.
- 这种方法为设计高效和稳定的氧化物基电催化剂用于生产提供了新的途径.
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