Tunable d-Band Centers of Ni5P4 Ultra-Thin Nanosheets for Highly-Efficient Hydrogen Evolution Reaction

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Chengcheng Miao
  • Yanmei Zang
  • Hang Wang
  • Xinming Zhuang
  • Ning Han
  • Yanxue Yin
  • Yandong Ma
  • Ming Chen
  • Ying Dai
  • Zai-xing Yang

Detail(s)

Original languageEnglish
Article number2200739
Journal / PublicationAdvanced Materials Interfaces
Volume9
Issue number22
Online published6 Jul 2022
Publication statusPublished - 3 Aug 2022

Abstract

Although the recent advance of ultra-thin 2D nanosheets for hydrogen evolution reaction (HER) is remarkable, there are still substantial challenges to reliably control their physioelectric and electrochemical properties to employ as highly-efficient electrocatalysts. Herein, based on complementary theoretical and experimental studies, the d-band center position of ultra-thin 2D Ni5P4 nanosheets can be manipulated by simple heteroatom doping. Interestingly, the Fe-doped nanosheets yield the lowest d-band center position, but they do not display the optimal Gibbs free energy of adsorbed H atoms due to the imbalance of adsorption and desorption of adsorbed H atoms. With the proper Co doping (i.e., 20%), the nanosheets exhibit the best electrocatalytic performance along with an excellent stability. The overpotential is only 100.5 mV at 10 mA cm−2 with a Tafel slope of 65.8 mV dec−1, which is superior than those of Fe-doped, Cu-doped, and pristine Ni5P4 nanosheets. Ultraviolet photoelectron and X-ray photoelectron spectroscopy further verify the downshift of d-band centers of nanosheets by optimal doping, illustrating that Ni with the lower binding energy mainly dominates the active sites. All these results provide a valuable design scheme of dopants to control the d-band center position of nanosheets for next-generation highly-efficient HER electrocatalysts.

Research Area(s)

  • d-band center, doping, hydrogen evolution reaction, Ni5P4, ultra-thin nanosheets

Citation Format(s)

Tunable d-Band Centers of Ni5P4 Ultra-Thin Nanosheets for Highly-Efficient Hydrogen Evolution Reaction. / Miao, Chengcheng; Zang, Yanmei; Wang, Hang et al.
In: Advanced Materials Interfaces, Vol. 9, No. 22, 2200739, 03.08.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review