Small-sized Ni-Co/Mo2C/Co6Mo6C2@C for efficient alkaline and acidic hydrogen evolution reaction by an anchoring calcination strategy

doi:10.1007/s11705-024-2416-2

2024, Vol. 18

Issue (5) : 57 https://doi.org/10.1007/s11705-024-2416-2

Small-sized Ni-Co/Mo₂C/Co₆Mo₆C₂@C for efficient alkaline and acidic hydrogen evolution reaction by an anchoring calcination strategy

Jianxia Gu¹(

), Ying Zhu², Haiyan Zheng², Chunyi Sun²(

), Zhongmin Su²

¹. Department of Chemistry, Xinzhou Normal University, Xinzhou 034000, China
². School of Chemistry, Northeast Normal University, Changchun 130024, China

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Abstract

A novel, cheap and highly efficient Ni-Co/Mo₂C/Co₆Mo₆C₂@C nanocomposite has been successfully constructed through simple one-step carbonization method in a nitrogen atmosphere. Polyethyleneimine in the precursor can effectively anchor molybdenum-based Keggin-type polyoxometallate and NiCo-layered double hydroxide through electrostatic and coordination interactions, which avoids the aggregation of catalyst particles during the pyrolysis process. After optimization, the obtained Ni-Co/Mo₂C/Co₆Mo₆C₂@C possesses small size (3–8 nm), large specific surface area and hierarchical pore structure. More importantly, Ni-Co/Mo₂C/Co₆Mo₆C₂@C presents remarkable hydrogen evolution reaction activity with low overpotentials in 0.5 mol·L^–1 H₂SO₄ (102.3 mV) and 1 mol·L^–1 KOH (95 mV) to afford the current density of 10 mA·cm^–2, as well as small Tafel slopes of 82.49 and 99.92 mV·dec^–1, respectively. Simultaneously, this catalyst also shows outstanding stability for 12 h without a significant change in current density. The excellent catalytic performance of Ni-Co/Mo₂C/Co₆Mo₆C₂@C can put down to the synergistic effect between multiple components and the small size of the catalyst. This work provides unique insights into the preparation of efficient transition metal-based catalysts for HER.

Keywords polyoxometallates layered double hydroxide transition metal-based electrocatalysts hydrogen evolution reaction

Corresponding Author(s): Jianxia Gu,Chunyi Sun

Just Accepted Date: 25 January 2024 Issue Date: 19 March 2024

Cite this article:

Jianxia Gu,Ying Zhu,Haiyan Zheng, et al. Small-sized Ni-Co/Mo₂C/Co₆Mo₆C₂@C for efficient alkaline and acidic hydrogen evolution reaction by an anchoring calcination strategy[J]. Front. Chem. Sci. Eng., 2024, 18(5): 57.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-024-2416-2
https://academic.hep.com.cn/fcse/EN/Y2024/V18/I5/57

Scheme1 Synthesis diagram of Ni-Co/Mo₂C/Co₆Mo₆C₂@C.

Fig.1 XRD patterns of Ni-Co/Mo₂C/Co₆Mo₆C₂@C, Mo₂C@C, Ni-Co@C and C.

Fig.2 (a) TEM image of Ni-Co/Mo₂C/Co₆Mo₆C₂@C (illustrated as particle size distribution in Ni-Co/Mo₂C/Co₆Mo₆C₂@C), (b–e) HRTEM images of Ni-Co/Mo₂C/Co₆Mo₆C₂@C, (f–i) EDX mapping of Ni, Co, and Mo in Ni-Co/Mo₂C/Co₆Mo₆C₂@C.

Fig.3 XPS spectra of Ni–Co/Mo₂C/Co₆Mo₆C₂@C, (a) C 1s, (b) N 1s, (c) Mo 3d and (d) Co 2p.

Fig.4 LSV curves and corresponding Tafel plots of Ni-Co/Mo₂C/Co₆Mo₆C₂@C, Mo₂C@C, Ni-Co@C, C and commercial 20% Pt/C in (a, c) 0.5 mol·L^–1 H₂SO₄ and (b, d) 1 mol·L^–1 KOH. (e, f) C_dl fitting graphs of Ni-Co/Mo₂C/Co₆Mo₆C₂@C, Mo₂C@C, Ni-Co@C, C in 0.5 mol·L^–1 H₂SO₄ and 1 mol·L^–1 KOH.

Fig.5 (a, b) Comparison of polarization curves of Ni-Co/Mo₂C/Co₆Mo₆C₂@C during 2000 cycles in acidic and alkaline solutions. (c, d) Stability tests of Ni-Co/Mo₂C/Co₆Mo₆C₂@C at constant voltage in acidic and alkaline solutions.

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