Ni-Directed biphase N-doped Mo2C as an efficient hydrogen evolution catalyst in both acidic and alkaline conditions. Issue 16 (8th April 2022)

• Record Type: Journal Article
• Authors: Du, Cheng-Feng; Wang, Yaxin; Zhao, Xiangyuan; Wang, Jinjin; Wang, Xiaomei; Wang, Weigang; Yu, Hong
• Is Part Of: Dalton transactions. Volume 51:Issue 16(2022)
• Page Start: 6464
• Page End: 6472
• Publication Date: 2022-04-08
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2dt00449f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : In this work, Ni is found to direct the formation of a biphase N-doped Mo2 C composite. With a Ni, N-codoped biphase structure, the material delivers enhanced hydrogen evolution activity under both acidic and alkaline conditions. Abstract : The development of efficient and low-cost catalysts is of great significance for the future application of the electrocatalytic hydrogen evolution reaction (HER). Herein, a series of Ni, N co-doped Mo2 C nanostructures (Ni x –Mo2 C/N) with different Ni content levels are fabricated. The phase-directing effect of Ni on Mo2 C/N is observed, which is in charge of the phase transformation of Mo2 C/N from an α - to a β -phase. At the optimized Ni-doping level, biphase Ni15 –Mo2 C/N exhibits outstanding HER activity under both acidic and alkaline conditions. In particular, under alkaline conditions, Ni15 –Mo2 C/N delivers an overpotential of only 105.0 mV, accompanied by a low Tafel slope of 44.96 mV dec −1 . The performance is comparable to commercial 20% Pt/C and higher than most state-of-the-art Mo2 C-based catalysts as well.