4.8 Article

Multi-hierarchical cobalt-based electrocatalyst towards high rate H2 production

Journal

APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 316, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apcatb.2022.121666

Keywords

Hydrogen evolution; Large current density; Non -precious metal catalyst; Multi -hierarchical

Funding

  1. National Key R&D Program of China [2021YFB3801600]
  2. National Natural Science Foundation of China [21872121, 21908189]
  3. Pioneer and Leading Goose R&D Program of Zhejiang Province [2022C01151, 2022C01218]

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A rational design of a multi-hierarchical tandem type electrocatalyst with cobalt, cobalt oxide, and cobalt molybdate was achieved, enabling efficient water dissociation and hydrogen recombination reactions. The electrocatalyst exhibited high catalytic activity and stability under both alkaline and neutral conditions.
Herein, a rational design of cobalt/cobalt oxide/cobalt molybdate/nickel foam multi-hierarchical tandem type electrocatalyst was achieved, where in situ reduced Co and CoO nanoparticles were dispersed uniformly and stabilized by CoMoO3 cuboids. This novel tandem type structure enables strong hydroxyl adsorption on CoO and moderated hydrogen adsorption on Co and therefore promotes the dissociation of water and the recombination of hydrogen intermediates into molecular hydrogen, respectively, and both act synergistically to catalyze the HER reaction. As a result, the current densities were up to 1.3 A cm-2 at only 173 mV overpotential in 1.0 M KOH and 379 mV in 1.0 M PBS solution, respectively. The high rate H2 production of 4.35 ml min-1 at - 1.18 V (vs. SCE) and the outstanding performance of 10 A lasting for more than 800 h in a MEA electrolyzer both indicate the prospect for the usage in practical.

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