Polyoxometalate-Derived Hexagonal Molybdenum Nitrides (MXenes) Supported by Boron, Nitrogen Codoped Carbon Nanotubes for Efficient Electrochemical Hydrogen Evolution from Seawater

Jun Miao, Zhongling Lang, Xinyu Zhang, Weiguang Kong, Ouwen Peng, Ye Yang, Shuangpeng Wang, Jiaji Cheng, Tingchao He, Abbas Amini, Qingyin Wu, Zhiping Zheng, Zikang Tang, Chun Cheng

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

MXenes and doped carbon nanotubes (CNTs) have entered into research arenas for high-rate energy storage and conversion. Herein, a method of postsynthesis of MXenes in boron, nitrogen codoped CNTs (BNCNTs) is reported with their electrocatalytical hydrogen evolution performance. The encapsulation of hexagonal molybdenum nitrate nanoparticles (h-MoN NPs) into BNCNTs protects h-MoN NPs from agglomeration and poisoning in the complex environment. In principle, the synergism of B and N dopants on the doped CNTs and confined h-MoN NPs produces extremely active sites for electrochemical hydrogen evolution. Density functional theory calculations reveal that the active sites for hydrogen evolution originate from the synergistic effect of h-MoN(001)/CN (graphitic N doping) and h-MoN(001)/BNC. The h-MoN@BNCNT electrocatalyst exhibits a small overpotential of 78 mV at 10 mA cm−2 and Tafel slope of 46 mV per decade, which are dramatically improved over all reported MoN-based materials and doped CNTs. Additionally, it also exhibits outstanding electrochemical stability in environments with various pH values and seawater media from South China Sea.

Original languageEnglish (US)
Article number1805893
JournalAdvanced Functional Materials
DOIs
StateAccepted/In press - Jan 1 2018

Keywords

  • density functional theory calculations
  • doped carbon nanotubes
  • hydrogen evolution reaction
  • MXenes
  • polyoxometalate

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Polyoxometalate-Derived Hexagonal Molybdenum Nitrides (MXenes) Supported by Boron, Nitrogen Codoped Carbon Nanotubes for Efficient Electrochemical Hydrogen Evolution from Seawater'. Together they form a unique fingerprint.

  • Cite this