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Fe13+-ion irradiated WS2 with multi-vacancies and Fe dopants for hydrogen evolution reaction
FlatChem ( IF 5.9 ) Pub Date : 2021-04-18 , DOI: 10.1016/j.flatc.2021.100247
Dianliang Cao , Tongmin Zhang , Jian Zeng , Li Cai , Xiaofeng Pu , Jinmei Qian , Daqiang Gao , Jie Liu

The effect of ion irradiation on the activation and conductivity of the basal plane of 2H-phase WS2 remains elusive for the enhancement of hydrogen evolution reaction (HER) properties. The objective of this study is to increase the number of electrocatalytic active sites by creating multi-vacancies (W vacancy, S vacancy, or the coexistence of W and S vacancies), simultaneously combing with doping strategy to improve the intrinsic conductivity and activate the HER catalytic performance of S sites in the basal plane of pristine WS2 nanospheres. Herein, high-energy Fe13+-ion irradiation technology was used to irradiate the WS2 surface, which not only regulates multi-vacancies, but also introduces Fe dopants with Fe2+ and Fe3+ into WS2. Density functional theory firstly demonstrates that the creation of multi-vacancies coupling with Fe doping could significantly narrow the band gap of pristine WS2, which is beneficial to the acceleration of electron transfer during the HER process. Experimentally, moderate doses of the Fe13+-ion irradiated WS2 electrocatalyst (8*1013) achieved the optimum HER activity with a higher current density, lower onset overpotential and excellent stability in acidic electrolyte. This strategy is a promising perspective for the design of highly efficient electrocatalysts via the Fe13+-ion irradiation pathway.



中文翻译:

Fe 13+离子多空位和Fe掺杂的WS 2放氢反应

离子辐照对2H相WS 2基面的活化和电导率的影响对于增强析氢反应(HER)性能仍然难以捉摸。这项研究的目的是通过创建多个空位(W空位,S空位或W和S空位的共存)来增加电催化活性位点的数量,同时结合掺杂策略以提高固有电导率并激活HER原始WS 2纳米球基面中S部位的催化性能。此处,采用高能Fe 13+离子辐照技术辐照WS 2表面,不仅调节了多个空位,而且还引入了Fe 2+掺杂剂。和Fe 3+进入WS 2。密度泛函理论首先证明,与Fe掺杂形成多空位可显着缩小原始WS 2的带隙,这有利于HER过程中电子转移的加速。实验上,中等剂量的Fe 13+离子辐照的WS 2电催化剂(8 * 10 13)具有最佳的HER活性,具有更高的电流密度,更低的起始过电位和在酸性电解质中的出色稳定性。该策略是通过Fe 13+离子辐射途径设计高效电催化剂的一个有前途的观点。

更新日期:2021-04-18
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