3D heterostructured pure and N-Doped Ni3S2/VS2 nanosheets for high efficient overall water splitting

Xiongwei Zhong, Jun Tang, Jingwei Wang, Mengmeng Shao, Jianwei Chai, Shuangpeng Wang, Ming Yang, Ye Yang, Ning Wang, Shijie Wang, Baomin Xu, Hui Pan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

89 Citations (Scopus)

Abstract

Exploring earth-abundant electrocatalysts with high activity and low-cost for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is vital to energy harvesting and storage, such as fuel cell and effective overall water splitting. Herein, novel heterostructures (Ni3S2/VS2) without nitrogen (N) and with N doping are reported as superior electrocatalysts for the OER and HER, respectively. The heterostructure without doping shows enhanced OER performance with an extremely low overpotential (227 mV at 10 mA/cm2) due to increased active sites and fantastic interfaces as well as unique structure. Moreover, N-doped Ni3S2/VS2 (N-Ni3S2/VS2) shows high electrocatalytic HER performance with a low HER overpotential (151 mV at 10 mA/cm2), because the N-doping greatly improves conductivity and increases large amounts of catalytic active sites. Finally, we construct a two-electrode electrolyzer system (Ni3S2/VS2//N-Ni3S2/VS2) and it achieves a current density of 10 mA/cm2 at a low cell voltage of 1.648 V. Our findings demonstrate that structure design and doping can effectively improve the catalytic activities of nanomaterials for OER and HER.

Original languageEnglish
Pages (from-to)55-61
Number of pages7
JournalElectrochimica Acta
Volume269
DOIs
Publication statusPublished - 10 Apr 2018

Keywords

  • Heterostructure
  • N-doping
  • Nickel sulfide
  • Over-all water splitting
  • Vanadium sulfide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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