Hydrophilic engineering of VOX-based nanosheets for ambient electrochemical ammonia synthesis at neutral pH

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Wei Fang
  • Jin Zhao
  • Tao Wu
  • Yinjuan Huang
  • Lan Yang
  • Chuntai Liu
  • Kevin Huang
  • Qingyu Yan

Detail(s)

Original languageEnglish
Pages (from-to)5913-5918
Journal / PublicationJournal of Materials Chemistry A
Volume8
Issue number12
Online published27 Feb 2020
Publication statusPublished - 28 Mar 2020
Externally publishedYes

Abstract

Achieving fast electrocatalytic nitrogen reduction reaction (NRR) at ambient conditions has an important implication to the low-cost synthesis of ammonia, a paramount raw material for agricultural and chemical industries. However, ambient NRR is severely challenged by the lack of active electrocatalysts and a serious competition between hydrogen evolution reaction (HER) and NRR. Herein, we report a low-cost, oxygen-deficient, and multivalent vanadium oxide (mVOx) nanosheets mixed with reduced graphene oxide (rGO) as an active electrocatalyst for NRR. The testing results show a high ammonia yield of 18.84 μg h-1 mgcat.-1 and a remarkable faradaic efficiency of 16.97% at -0.35 V versus reversible hydrogen electrode in a neutral 0.1 M Na2SO4 electrolyte. The outstanding performance is correlated by theoretical calculations to the hydrophilicity and high concentration of oxygen vacancies in mVOx, which promote nitrogen/water activation and lower the energy barrier for NRR. The presented insights of tailoring hydrophilicity via defect engineering are expected to significantly influence future designs of high-performance NRR electrocatalysts.

Citation Format(s)

Hydrophilic engineering of VOX-based nanosheets for ambient electrochemical ammonia synthesis at neutral pH. / Fang, Wei; Zhao, Jin; Wu, Tao; Huang, Yinjuan; Yang, Lan; Liu, Chuntai; Zhang, Qichun; Huang, Kevin; Yan, Qingyu.

In: Journal of Materials Chemistry A, Vol. 8, No. 12, 28.03.2020, p. 5913-5918.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review