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Structurally Ordered Pt3Co Nanoparticles Anchored on N-Doped Graphene for Highly Efficient Hydrogen Evolution Reaction
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-11-05 , DOI: 10.1021/acssuschemeng.0c06547
Caoxin Lin 1 , Zhiqiao Huang 1 , Zeyi Zhang 1 , Tang Zeng 1 , Runzhe Chen 1 , Yangyang Tan 1 , Wei Wu 1 , Shichun Mu 2 , Niancai Cheng 1
Affiliation  

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.

中文翻译:

固定在N掺杂石墨烯上的结构有序的Pt 3 Co纳米颗粒,用于高效的氢气析出反应

开发用于氢气析出反应(HER)的高效催化剂在电化学水分解的大规模应用中起着重要作用。在这里,我们开发了一种在N掺杂石墨烯(NG)上负载的超细有序Pt 3 Co NP,该纳米NP在10 mA cm –2时具有13 mV的小过电位,可实现高HER活性。更重要的是,在20 mV的超电势下,有序Pt 3 Co催化剂(Pt 3 Co / NG-700)的质量活性是无序Pt 3 Co催化剂(Pt 3 Co / NG)的19.0和51.8倍,并已商品化Pt / C催化剂。另外,Pt 3在苛刻的计时电位法和酸性介质中的循环测试下,Co / NG-700电催化剂显示出出色的长期稳定性。理论计算表明,Pt 3 Co / NG-700电催化剂具有非凡的HER性能,是由于Co在结构有序的Pt 3 Co金属间化合物中引起的Pt电荷重新分布所致。Pt的电荷重新分布有助于H *的吸附和解离,并提供更高的电子转移和更好的电导率,从而导致较高的HER。我们的工作为设计用于高效HER的贵族合金催化剂提供了新的机会。
更新日期:2020-11-16
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