隔离的不对称的CoN4位点在添加的空心碳上作为双pH电解质中的演变反应的电催化剂
Yihang Xue1, Dahai Zeng1, Yuying Meng1
1Institute of Advanced Wear & Corrosion Resistant and Functional Materials, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, China.
Journal of colloid and interface science
|May 1, 2025
概括
这项研究介绍了添加空心碳 (CoSA/NHCs) 上的新型单一原子作为高效的电催化剂. 这些催化剂在性和酸性条件下都表现出卓越的演化反应 (HER) 活性和稳定性.
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:
- 碳上原子过渡金属- (Mx-N) 活性点是有前途的电催化剂.
- 由于水分离不良,对称的M-N4配置显示出有限的性演化反应 (HER) 活性.
- 开发高效和稳定的HER电催化剂对于能量转换至关重要.
研究的目的:
- 在N-doped空心碳基板 (CoSA/NHCs) 上制造孤立的单个原子.
- 调查性和酸性电解质中CoSA/NHCs增强的HER活性和稳定性.
- 探索不对称的Co-N4部分在促进水激活和吸附中的作用.
主要方法:
- 含有CO2+的聚乙烯 (Co-PPY) 前体的热解以形成CoSA/NHCs.
- 移除嵌入的颗粒以隔离单个原子.
- 在性和酸性介质中HER性能的电化学表征.
主要成果:
- 在CoSA/NHC中,不对称的Co-N4活性位点的密度很高.
- 电催化剂在1.0M KOH和0.5M H2SO4.4中显示出显著的HER活性和稳定性.
- CoSA/NHC-800 需要低超电位 (230 mV 在KOH,228 mV 在H2SO4) 对于-10 mA cm-2.
- 实现了高法拉第克效率 (~100%) 和卓越的长期稳定性.
结论:
- 原子分布不对称的Co-N4部分增强了高级HER的水激活和H*吸附.
- CoSA/NHCs为设计高性能单原子电催化剂提供了一种战略方法.
- 开发的催化剂显示出在各种电解质中高效生产的前景.
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