Sequential self-reconstruction of localized Mo species in hierarchical carbon/Co-Mo oxide heterostructures for boosting alkaline hydrogen evolution kinetics and durability

Quan Quan, Xiuming Bu, Dong Chen, Fei Wang, Xiaolin Kang, Wei Wang, You Meng, Senpo Yip, Chuntai Liu, Johnny C. Ho

研究成果: ジャーナルへの寄稿学術誌査読

12 被引用数 (Scopus)

抄録

Surface self-reconstruction processes in alkaline hydrogen evolution reaction (HER), especially regarding the explicit structure-activity relationships, remain elusive. Here, we first design a hierarchical Co@NCNT/CoMoOx precatalyst constituted by defective CoMoOx nanosheets grafted with flexible Co@NCNT arrays, followed by a delicate anodic treatment for fast dissolution balance. Benefiting from the multi-level Co@NCNT arrays as a stable micro-environment, the resultant Co@NCNT/CoMoyOx displays excellent electrocatalytic activity with a low overpotential of 195 mV at -100 mA cm-2 and stable 600 h operation for the HER in alkaline media, including natural seawater, which is better than most reported carbon/transition metal-based catalysts. In situ Raman analyses disclose a local high-resolution self-reconstruction evolution of localized Mo species at controllable negative potentials. Density functional theory calculations further demonstrate that the ultimate Mo-Mo surface state accelerates reaction kinetics to promote H2 generation in alkaline media. Our findings provide a unique insight into the mechanism of the structural evolution in the alkaline HER process to pave a new avenue guiding the design of durable and efficient catalysts.

本文言語英語
ページ(範囲)3953-3962
ページ数10
ジャーナルJournal of Materials Chemistry A
10
8
DOI
出版ステータス出版済み - 2月 28 2022

!!!All Science Journal Classification (ASJC) codes

  • 化学一般
  • 再生可能エネルギー、持続可能性、環境
  • 材料科学一般

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