arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.06161cond-mat.mtrl-sciphysics.app-ph
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单分子膜2 H- CrS2的结构稳定性及析氢性能预测

Prediction for structure stability and ultrahigh hydrogen evolution performance of monolayer 2H-CrS2

Feng Sun, Aijun Hong, Wenda Zhou, Cailei Yuan, Wei Zhang

摘要:

结合第一性原理计算和爬像轻推弹性带方法(ciNEB)研究了单层2 H-CrS 2的结构稳定性和析氢反应性能.结果表明,在含S空位的2 H-CrS 2单分子膜中,Volmer反应的自由能为0.07 eV,与Pt基催化剂相当,单分子膜表面的HER反应符合Volmer-Heyrovsky机理,没有能垒.我们认为,高HER性能源于d带中心的能级的降低。此外,S空位导致电子带隙中间的缺陷态,降低了S原子层与真空之间的势垒,有利于提高HER性能。

英文摘要:

By a combination of the first-principles calculations and climbing image nudged elastic band method (ciNEB) we investigate structure stabilities and hydrogen evolution reaction (HER) performance of monolayer 2H-CrS2. The results suggest the free energy for the Volmer reaction in the monolayer 2H-CrS2 with S vacancy is 0.07 eV, comparable with Pt-based catalyst, and HER on the surface of the monolayer is prone to the Volmer-Heyrovsky mechanism with no energy barrier. We propose that high HER performance stems from the reduction of the energy level of d-band center. Additionally, the S vacancy leads to defect states in the middle of electronic bandgap and the reduction of potential barrier between the S atom layer and the vacuum, which is conducive to improve HER performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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