聚乙烯吡咯烷酮
催化作用
铂金
吸附
密度泛函理论
Atom(片上系统)
材料科学
分子
氢
化学
化学工程
组合化学
光化学
物理化学
计算化学
高分子化学
有机化学
计算机科学
工程类
嵌入式系统
作者
Can Li,Zheng Chen,Yi Hong,Yi Cao,Lei Du,Yunxia Hu,Fanpeng Kong,R. Kramer Campen,Yunzhi Gao,Chunyu Du,Geping Yin,Igor Ying Zhang,Yujin Tong
标识
DOI:10.1002/anie.202005282
摘要
The essence of developing a Pt-based single-atom catalyst (SAC) for hydrogen evolution reaction (HER) is the preparation of well-defined and stable single Pt sites with desired electrocatalytic efficacy. Herein, we report a facile approach to generate uniformly dispersed Pt sites with outstanding HER performance via a photochemical reduction method using polyvinylpyrrolidone (PVP) molecules as the key additive to significantly simplify the synthesis and enhance the catalytic performance. The as-prepared catalyst displays remarkable kinetic activities (20 times higher current density than the commercially available Pt/C) with excellent stability (76.3 % of its initial activity after 5000 cycles) for HER. EXAFS measurements and DFT calculations demonstrate a synergetic effect, where the PVP ligands and the support together modulate the electronic structure of the Pt atoms, which optimize the hydrogen adsorption energy, resulting in a considerably improved HER activity.
科研通智能强力驱动
Strongly Powered by AbleSci AI