期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 41, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202205985
关键词
defects; heterointerfaces; hydrogen evolution reactions; methanol oxidation reactions; Pt; Pt; P-5; (2) nanocages
类别
资金
- Ministry of Education in Singapore [RG105/19, RG63/21]
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [2022-K31]
A fast phosphating strategy is presented to establish a Pt/Pt5P2 porous nanocage with numerous heterointerfaces and defects. The resulting catalyst shows extraordinary activity and stability for both hydrogen evolution reaction and methanol oxidation reaction, surpassing conventional Pt/C catalyst.
Designing cost-effective and durable Pt-based catalysts is vital and challenging for practicable energy storage and conversion technologies. Here, a fast phosphating strategy to establish a Pt/Pt5P2 porous nanocage with numerous heterointerfaces and defects is presented. It exhibits extraordinary activity and stability for both hydrogen evolution reaction (HER) with a small overpotential of 29 mV at 10 mA cm(-2) and methanol oxidation reaction (MOR) with a high mass activity of 1.37 A mg(Pt)(-1) at peak values, surpassing Pt/C. Microstructural analyzes show that many stacking faults are induced around heterointerfaces, while rich vacancies and atomic steps are created by the phosphorus-induced thermal migration of Pt atoms, serving as highly active low-coordination sites. X-ray absorption spectroscopy and theoretical calculations reveal that introducing P atoms can modify the electronic configuration of Pt, thus optimizing H2O/H* binding strength and lowering water dissociation energy to accelerate HER, while decreasing the energy barrier of the rate-limiting step (*CHO to *HCOOH) to facilitate MOR.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据