精确的原子结构 单原子催化剂的精确原子结构调节,以实现高效的进化反应反应
Chunqiao Jin1, Liuxiang Huo1, Jianli Tang1
1Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai), Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education), Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, China.
Small (Weinheim an der Bergstrasse, Germany)
|November 22, 2023
概括
贵金属单原子催化剂 (SACs) 对进化反应 (HER) 催化有望. 精确地将单个原子固定在Ni(OH) 2边缘上,在中性/性介质中显著提高了活性和稳定性.
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:
- 贵金属单原子催化剂 (SAC) 为演化反应 (HER) 提供高原子效率.
- 在优化SAC的活性位点和催化活性方面仍然存在挑战,特别是在中性/性环境中,导致动力学减慢和不稳定.
- 合理的SAC设计对于提高HER性能至关重要.
研究的目的:
- 为了精确地构建单个原子定在2D分层Ni(OH) 2 (Pt-Ni(OH) 2-E的边缘.
- 调查Pt-Ni(OH) 2-E与在基底平面 (Pt-Ni(OH) 2-BP) 上的Pt相比,其增强的催化活性和稳定性.
- 为 HER 提供设计高性能 SAC 的见解.
主要方法:
- 在现场用电解沉积来将金单个原子固定在2D层Ni(OH) 2.2.的边缘位置上.
- 使用电化学表征技术来评估HER的催化性能.
- 边缘固定 (Pt-Ni(OH) 2-E) 和基底平面固定 (Pt-Ni(OH) 2-BP) SACs之间的催化性能比较.
主要成果:
- 与Pt-Ni(OH) 2-BP相比,Pt-Ni(OH) 2-E表现出更高的电子亲和力和内在的催化活性.
- 工程催化剂表现出强烈的吸附和水分子的快速解离.
- 需要21mV (性) 和34mV (中性) 的低超电位才能达到10mA cm-2.
- 在100mV超电位下达到23.6A mg-1 (Pt) 的高质量活性,超过现有的催化剂和商业Pt/C.
结论:
- 在Ni(OH) 2边缘上精确地定Pt单个原子,产生高度活跃和稳定的HER催化剂.
- 在中性和性介质中,Pt-Ni(OH) 2-E催化剂表现出了卓越的性能.
- 这项研究为高效生产的先进单原子催化剂的合理设计提供了有价值的策略.
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