Nitrogen-Doped MoS2/Ti3C2TX Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Dong Liu; Zepeng Lv; Jie Dang; Wansen Ma; Kailiang Jian; Meng Wang; Dejun Huang; Weiqian Tian

doi:10.1021/acs.inorgchem.1c01193

Nitrogen-Doped MoS₂/Ti₃C₂T_X Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Inorg Chem. 2021 Jul 5;60(13):9932-9940. doi: 10.1021/acs.inorgchem.1c01193. Epub 2021 Jun 16.

Authors

Dong Liu^{1

2}, Zepeng Lv^{1

2}, Jie Dang^{1

2}, Wansen Ma^{1

2}, Kailiang Jian^{1

2}, Meng Wang^{1

2}, Dejun Huang³, Weiqian Tian⁴

Affiliations

¹ College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China.
² Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, PR China.
³ Spectris Instrumentation and Systems Shanghai Ltd., Shanghai 200233, PR China.
⁴ Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, Stockholm 10044, Sweden.

PMID: 34133160
DOI: 10.1021/acs.inorgchem.1c01193

Abstract

Molybdenum disulfide (MoS₂) is intrinsically inert for the hydrogen evolution reaction (HER) in alkaline media due to its electronic structures. Herein, we tune the electronic structures of MoS₂ by a combined strategy of post-N doping coupled with the synergistic effect of Ti₃C₂T_X. The as-prepared N-doped MoS₂/Ti₃C₂T_X heterostructures show remarkable alkaline HER activity with an overpotential of 225 mV at 140 mA cm^-2, which ranks the N-doped MoS₂/Ti₃C₂T_X heterostructures among the best MoS₂/MXene-based electrocatalysts reported for alkaline HER. The first-principles calculations indicate that the N doping can enhance the activation of nearby S sites of MoS₂/Ti₃C₂T_X and thus promote the HER process. This strategy provides a promising way to develop high-efficiency MoS₂/MXene heterostructure catalysts for alkaline HER.