在强条件下,在Ni矩阵中化单原子Pt上的气进化反应
Xiurui An1,2, Ting-Ting Yao1,2, Yang Liu1,2
1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China.
单原子催化剂 (Ni-Pt(SAs)) 在性介质中显示出优异的演化反应 (HER) 性能. 这种中原子分散的增强了高电流密度的催化动力学和生产.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- (Pt) 是酸性介质中演化反应 (HER) 的基准催化剂.
- 在性条件下Pt对HER的催化动力学仍然不太清楚.
- 了解性环境中的HER催化对于高效的生产至关重要.
研究的目的:
- 在强条件下,研究原子分散的Pt在Ni矩阵 (Ni-Pt(SAs)) 中的HER性能.
- 为了比较Ni-Pt(SAs的催化动力学和效率与Pt纳米粒子修饰的Ni (Ni-Pt(NPs)).
- 通过理论计算,阐明了Ni-Pt (SAs) 的增强HER活性背后的机制.
主要方法:
- 在Ni矩阵中合成Ni-Pt ((SAs) 催化剂与原子分散的Pt.
- 在7M KOH电解质中对HER性能进行电化学评估.
- 动力学分析以了解反应机制.
- 密度函数理论 (DFT) 计算用于研究吸附能和反应途径.
主要成果:
- Ni-Pt ((SAs) 呈现出优越的 HER 性能,在 7 M KOH 中在 500 mA cm−2 时达到 210 mV 的过电位.
- 与Ni-Pt (NPs) 相比,Ni-Pt (SAs) 在高电流密度下显示出明显更好的HER动力学.
- 理论计算表明,原子分散的Pt减弱了H和OH吸附,并促进了Ni-Pt表面的H2形成.
结论:
- 在Ni矩阵中原子分散的Pt (Ni-Pt(SAs)) 是HER在强电解质中的高效催化剂.
- 增强的性能归因于加速的沃尔默步骤动力学和有利的H2形成路径.
- Ni-Pt ((SAs) 为性HER应用提供了一个对传统的Pt纳米粒子催化剂有希望的替代品.
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