氢溢流
氢
化学物理
材料科学
溢出效应
吸附
催化作用
金属
工作(物理)
化学
纳米技术
热力学
物理化学
物理
经济
冶金
有机化学
微观经济学
生物化学
作者
Jiayuan Li,Jun Hu,Mingkai Zhang,Wangyan Gou,Sai Zhang,Zhong Chen,Yongquan Qu,Yuanyuan Ma
标识
DOI:10.1038/s41467-021-23750-4
摘要
Hydrogen spillover phenomenon of metal-supported electrocatalysts can significantly impact their activity in hydrogen evolution reaction (HER). However, design of active electrocatalysts faces grand challenges due to the insufficient understandings on how to overcome this thermodynamically and kinetically adverse process. Here we theoretically profile that the interfacial charge accumulation induces by the large work function difference between metal and support (∆Φ) and sequentially strong interfacial proton adsorption construct a high energy barrier for hydrogen transfer. Theoretical simulations and control experiments rationalize that small ∆Φ induces interfacial charge dilution and relocation, thereby weakening interfacial proton adsorption and enabling efficient hydrogen spillover for HER. Experimentally, a series of Pt alloys-CoP catalysts with tailorable ∆Φ show a strong ∆Φ-dependent HER activity, in which PtIr/CoP with the smallest ∆Φ = 0.02 eV delivers the best HER performance. These findings have conclusively identified ∆Φ as the criterion in guiding the design of hydrogen spillover-based binary HER electrocatalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI