构建用于水激活和解离的异质接口,以协同促进整体水分裂
Xinzeng Zhang1, Lixin Chen2, Yuanyuan Liu1
1School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China.
Journal of colloid and interface science
|March 28, 2024
概括
这项研究引入了一种新的双功能电极,用于高效的电化学水分. Co/Co2Mo3O8/NF电极在进化反应 (HER) 和氧进化反应 (OER) 两方面都表现出卓越的性能.
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:
- 电化学分水对于清洁的生产至关重要.
- 开发高效和成本效益的电催化剂,用于演化反应 (HER) 和氧演化反应 (OER) 仍然是一个挑战.
- 具有双重活性成分的异质接口为增强催化活性提供了一个有希望的策略.
研究的目的:
- 构建一个有效的异质接口与双重活性成分 (Co和Co2Mo3O8) 协同HER和OER.
- 开发一种简单的合成程序,将这些活性成分集成到泡 (NF) 支上.
- 研究用于电化学水分裂的新型双功能电极的催化性能和机制.
主要方法:
- 合成Co/Co2Mo3O8/NF双功能电极,通过热还原聚酸前体.
- 电化学表征,包括对HER和OER在性介质中的电流密度为100mA cm-2的超电位测量.
- 理论计算 (例如,DFT) 阐明了界面电子转移和活性成分在水激活中的作用.
- 使用对称的Co/Co2Mo3O8/NF电极组装性电解器,以评估整体水分性能.
主要成果:
- Co/Co2Mo3O8/NF电极在100 mA cm-2.0下显示了HER的164 mV和OER的360 mV的低超电位,HER为164 mV,OER为360 mV.
- 理论计算显示,电子从Co转移到Co2Mo3O8,形成缺电子的界面原子,促进水的激活.
- 和Co2Mo3O8之间的协同效应显著降低了水解离的能量屏障.
- 一个带有对称Co/Co2Mo3O8/NF电极的性电解器在1.75V的低电压下实现了100mA cm-2,超过了商业Pt/RuO2催化剂的性能.
结论:
- Co/Co2Mo3O8/NF异质接口通过接口电子转移和增强水激活,有效地促进协同 HER 和 OER.
- 开发的合成方法简单且可扩展,用于生产高效的双功能电催化剂.
- Co/Co2Mo3O8/NF电极为高效和成本效益的电化学水分裂提供了对贵金属催化剂的有希望的替代品.
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