Hydrogenated graphene support for accelerating alkaline hydrogen evolution reaction

IF 3.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Carbon Trends Pub Date : 2024-06-20 DOI:10.1016/j.cartre.2024.100374

Siyi Jia , Mei Hong , He Xiao , Xingchen Liu , Xili Tong

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Abstract

Up to now, Platinum is still wildly regarded as the state-the-art catalyst toward hydrogen evolution reaction (HER) in acid, however alkaline HER is limited by its poor activity for water dissociation. In this regard, hydrogenated graphene (HG) was emerged as a functional support to boost alkaline HER for Pt catalysts. As a result, the optimized Pt/HG (4.15 % wt Pt) showed a wonderful activity in terms of an overpotential of 54 mV at 10 mA cm⁻² as well as a Tafel slope of 30.28 mV dec⁻¹, superior to the counterparts and even 20 wt% commercial Pt/C. Such a high activity was attributed to the fact HG can optimize electronic state and exposed facet of Pt to accelerate alkaline HER. In addition, density function theory (DFT) calculation revealed the energy barrier for H transfer from HG to Pt only required 0.02 eV, in line with experimental analysis. This work provides a promising strategy to design advanced catalysts toward alkaline HER and beyond.

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用于加速碱性氢进化反应的氢化石墨烯支架

迄今为止，铂仍被广泛认为是最先进的酸性氢进化反应（HER）催化剂，但碱性氢进化反应却因其较差的水解离活性而受到限制。为此，氢化石墨烯（HG）作为一种功能性载体应运而生，以提高铂催化剂的碱性氢催化反应活性。结果，优化后的 Pt/HG（4.15% wt Pt）显示出了极高的活性，在 10 mA cm-2 时过电位为 54 mV，Tafel 斜率为 30.28 mV dec-1，优于同类催化剂，甚至优于 20 wt% 的商用 Pt/C。如此高的活性归因于 HG 可以优化铂的电子状态和暴露面，从而加速碱性 HER。此外，密度函数理论（DFT）计算显示，HG 向铂转移 H 的能量势垒只需要 0.02 eV，与实验分析结果一致。这项工作为设计先进的催化剂以实现碱性 HER 及其他目标提供了一种前景广阔的策略。

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