金属间化合物
三元运算
纳米颗粒
氢
材料科学
氢气储存
化学
无机化学
化学工程
纳米技术
冶金
有机化学
合金
计算机科学
工程类
程序设计语言
作者
Yu‐Cheng Hou,Tao Shen,Kan Hu,Xue Wang,Qing‐Na Zheng,Jia‐Bo Le,Jin‐Chao Dong,Jianfeng Li
标识
DOI:10.1002/ange.202402496
摘要
Abstract Promoting the hydrogen oxidation reaction (HOR) activity and poisoning tolerance of electrocatalysts is crucial for the large‐scale application of hydrogen‐oxygen fuel cell. However, it is severely hindered by the scaling relations among different intermediates. Herein, lattice‐contracted Pt−Rh in ultrasmall ternary L1 2 ‐(Pt 0.9 Rh 0.1 ) 3 V intermetallic nanoparticles (~2.2 nm) were fabricated to promote the HOR performances through an oxides self‐confined growth strategy. The prepared (Pt 0.9 Rh 0.1 ) 3 V displayed 5.5/3.7 times promotion in HOR mass/specific activity than Pt/C in pure H 2 and dramatically limited activity attenuation in 1000 ppm CO/H 2 mixture. In situ Raman spectra tracked the superior anti‐CO* capability as a result of compressive strained Pt, and the adsorption of oxygen‐containing species was promoted due to the dual‐functional effect. Further assisted by density functional theory calculations, both the adsorption of H* and CO* on (Pt 0.9 Rh 0.1 ) 3 V were reduced compared with that of Pt due to lattice contraction, while the adsorption of OH* was enhanced by introducing oxyphilic Rh sites. This work provides an effective tactic to stimulate the electrocatalytic performances by optimizing the adsorption of different intermediates severally.
科研通智能强力驱动
Strongly Powered by AbleSci AI