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PtSe2/Pt Heterointerface with Reduced Coordination for Boosted Hydrogen Evolution Reaction
Angewandte Chemie International Edition ( IF 16.6 ) Pub Date : 2021-08-09 , DOI: 10.1002/anie.202110335
Zongpeng Wang 1 , Beibei Xiao 2 , Zhiping Lin 1 , Yaping Xu 1 , Yan Lin 1 , Fanqi Meng 3 , Qinghua Zhang 3 , Lin Gu 3 , Baizeng Fang 4 , Shaojun Guo 5 , Wenwu Zhong 1
Affiliation  

PtSe2 is a typical noble metal dichalcogenide (NMD) that holds promising possibility for next-generation electronics and photonics. However, when applied in hydrogen evolution reaction (HER), it exhibits sluggish kinetics due to the insufficient capability of absorbing active species. Here, we construct PtSe2/Pt heterointerface to boost the reaction dynamics of PtSe2, enabled by an in situ electrochemical method. It is found that Se vacancies are induced around the heterointerface, reducing the coordination environment. Correspondingly, the exposed Pt atoms at the very vicinity of Se vacancies are activated, with enhanced overlap with H 1s orbital. The adsorption of H. intermediate is thus strengthened, achieving near thermoneutral free energy change. Consequently, the as-prepared PtSe2/Pt exhibits extraordinary HER activity even superior to Pt/C, with an overpotential of 42 mV at 10 mA cm−2 and a Tafel slope of 53 mV dec−1. This work raises attention on NMDs toward HER and provides insights for the rational construction of novel heterointerfaces.

中文翻译:

PtSe2/Pt 异质界面,用于促进析氢反应的减少配位

PtSe 2是一种典型的贵金属二硫属化物(NMD),为下一代电子和光子学提供了广阔的前景。然而,当应用于析氢反应(HER)时,由于吸收活性物质的能力不足,它表现出缓慢的动力学。在这里,我们通过原位电化学方法构建了 PtSe 2 /Pt 异质界面以提高 PtSe 2的反应动力学。发现在异质界面周围诱导了Se空位,减少了配位环境。相应地,Se 空位附近暴露的 Pt 原子被激活,与 H 1s 轨道的重叠增强。H 的吸附中间体因此被强化,实现接近热中性的自由能变化。因此,所制备的PtSe 2 /Pt 表现出非凡的HER活性,甚至优于Pt/C,在10 mA cm -2 时具有42 mV的过电位和53 mV dec -1的Tafel斜率。这项工作引起了对 NMD 对 HER 的关注,并为合理构建新型异质界面提供了见解。
更新日期:2021-10-12
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