过电位
电催化剂
材料科学
催化作用
石墨烯
化学工程
纳米颗粒
合金
电化学
金属间化合物
分解水
纳米技术
无机化学
电极
物理化学
冶金
化学
有机化学
工程类
光催化
作者
Caoxin Lin,Zhiqiao Huang,Zeyi Zhang,Tang Zeng,Runzhe Chen,Yangyang Tan,Wei Wu,Shichun Mu,Niancai Cheng
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2020-11-05
卷期号:8 (45): 16938-16945
被引量:24
标识
DOI:10.1021/acssuschemeng.0c06547
摘要
Developing highly efficient catalysts for hydrogen evolution reaction (HER) play a significant role in the large-scale application of electrochemical water splitting. Here, we develop an ultrafine ordered Pt3Co NPs supported on N-doped graphene (NG), which achieves high HER activity with a small overpotential of 13 mV at 10 mA cm–2. More importantly, at the overpotential of 20 mV, the ordered Pt3Co catalyst (Pt3Co/NG-700) indicates 19.0 and 51.8 times mass activity than that of the disordered Pt3Co catalyst (Pt3Co/NG) and commercialized Pt/C catalyst, respectively. Additionally, the Pt3Co/NG-700 electrocatalyst displays outstanding long-term stability under harsh chronopotentiometry and cycling tests in the acidic media. The theory calculations reveal that the extraordinary HER performance on Pt3Co/NG-700 electrocatalyst originates from the charge redistribution of Pt induced by Co in the structurally ordered Pt3Co intermetallic. The charge redistribution of Pt facilitates the adsorption and dissociation of H* and provides a higher electron transfer and better conductivity, resulting in high HER. Our work opens new opportunities to design noble based alloy catalysts for highly efficient HER.
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