Tuning the Cobalt–Platinum Alloy Regulating Single-Atom Platinum for Highly Efficient Hydrogen Evolution Reaction,Advanced Functional Materials

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Tuning the Cobalt–Platinum Alloy Regulating Single-Atom Platinum for Highly Efficient Hydrogen Evolution Reaction
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-07-20 , DOI: 10.1002/adfm.202205920
Weiwei Yang ₁ , Ping Cheng ₁ , Zhao Li ₁ , Yunxiang Lin ₂ , Mengyuan Li ₁ , Jiangzhi Zi ₁ , Huihui Shi ₁ , Guisheng Li ₁ , Zichao Lian ₁ , Hexing Li ₃

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Designing atomically dispersed metal catalysts for the electrocatalytic hydrogen evolution reaction (HER) is a promising strategy to efficiently convert electrical energy to chemical fuels. This strategy, however, still faces the challenge of finding a catalyst with high activity and long-term durability. Here, single-atom platinum and cobalt–platinum-alloy nanocrystals in a nitrogen-doped porous-carbon framework (CoPt-Pt_SA/NDPCF) is confined. The electrocatalyst exhibits ultralow overpotentials under both alkaline and acidic conditions at a high current density of −300 mA cm⁻² and excellent long-term durability up to 100 h or 10 000 cycles, which are attributed to the synergetic effects of Pt_SA and tuning of the CoPt alloy in the NDPCF. First-principles calculations suggested that Pt_SA aided by the CoPt alloy has high d-band occupation for promoting the reaction kinetics. This study opens a new avenue for designing heterostructures with the synergic effects of single metal atoms and metal alloys with outstanding performance in the HER.

中文翻译：

调整钴铂合金调节单原子铂以实现高效的析氢反应

设计用于电催化析氢反应（HER）的原子分散金属催化剂是一种有效地将电能转化为化学燃料的有前途的策略。然而，这种策略仍然面临着寻找具有高活性和长期耐久性的催化剂的挑战。_{在这里，氮掺杂多孔碳框架（CoPt-Pt SA} /NDPCF）中的单原子铂和钴-铂合金纳米晶体受到限制。^{该电催化剂在碱性和酸性条件下在 -300 mA cm -2}的高电流密度下均表现出超低的过电势，以及长达 100 小时或 10 000 次循环的出色长期耐久性，这归因于 Pt _{SA的协同作用}和调整 NDPCF 中的 CoPt 合金。第一性原理计算表明，CoPt合金辅助的Pt _{SA具有较高的}d带占有率，可促进反应动力学。本研究为设计异质结构开辟了一条新途径，该异质结构具有单金属原子和金属合金的协同效应，在 HER 中具有出色的性能。

更新日期：2022-07-20

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