Atomically dispersed platinum supported on curved carbon supports for efficient electrocatalytic hydrogen evolution
Atomically dispersed platinum supported on curved carbon supports for efficient electrocatalytic hydrogen evolution
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弯曲碳载体上负载的原子分散铂可实现高效电催化析氢
DOI：
10.1038/s41560-019-0402-6
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发表时间：
2019-06-01
期刊：
影响因子：
56.7
通讯作者：
Song, Li
中科院分区：
文献类型：
--
作者：
Liu, Daobin;Li, Xiyu;Song, Li
将催化活性金属作为单个原子分散在载体上代表了金属利用效率的最终结果，并且越来越多地用作设计析氢反应（HER）电催化剂的策略。尽管铂（Pt）对于HER是高度活性的，但考虑到其高成本，期望找到在使Pt负载最小化的同时进一步提高性能的方法。在这里，我们使用洋葱状碳纳米球（OLC）来锚稳定的原子分散的Pt以充当HER的催化剂（Pt 1/OLC）。Pt 1/OLC催化剂的性能（0.27wt%Pt），就低过电位而言（10 mA cm−2时为38 mV）和高转换频率（40.78 H2s-1，100 mV）优于具有类似Pt负载量的石墨烯负载的单原子催化剂，并且与具有20重量% Pt的商业Pt/C催化剂相当。第一性原理计算表明，尖端增强局部电场的Pt网站上的弯曲支持促进析氢的反应动力学。
Dispersing catalytically active metals as single atoms on supports represents the ultimate in metal utilization efficiency and is increasingly being used as a strategy to design hydrogen evolution reaction (HER) electrocatalysts. Although platinum (Pt) is highly active for HER, given its high cost it is desirable to find ways to improve performance further while minimizing the Pt loading. Here, we use onion-like nanospheres of carbon (OLC) to anchor stable atomically dispersed Pt to act as a catalyst (Pt1/OLC) for the HER. In acidic media, the performance of the Pt1/OLC catalyst (0.27 wt% Pt) in terms of a low overpotential (38 mV at 10 mA cm−2) and high turnover frequencies (40.78 H2s−1at 100 mV) is better than that of a graphene-supported single-atom catalyst with a similar Pt loading, and comparable to a commercial Pt/C catalyst with 20 wt% Pt. First-principle calculations suggest that a tip-enhanced local electric field at the Pt site on the curved support promotes the reaction kinetics for hydrogen evolution.