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The Construction of g‐C 3 N 4 Coating Layer on CoN‐MoN Fiber via Thermopolymerization Nitriding Strategy for Enhanced Electrocatalytic Alkaline HER
Author(s) -
Zhang Delu,
Liu Ying,
Zhang Chao,
Wang Shengda
Publication year - 2025
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202500846
Abstract To achieve efficient electrocatalytic alkaline hydrogen evolution (HER), novel preparation methods for dual‐transition metal nitrides, with dense g‐C 3 N 4 /transition metal nitride interface, should be proposed. Herein, a novel g‐C 3 N 4 layer‐coated CoN‐MoN fiber electrocatalyst was prepared on Co foam (CF) via thermopolymerization nitriding strategy. During the fabrication process, CoN‐MoN fiber was prepared facilely on CF, and, meanwhile, a g‐C 3 N 4 layer was successfully coated on CoN‐MoN fiber. The synthesized electrocatalyst (g‐C 3 N 4 @CoN‐MoN/CF) exhibits a low overpotential of 138 mV at 100 mA cm −2 , a small Tafel slope (89 mV dec −1 ) during alkaline HER. The high water splitting capacity could be attributed to the special g‐C 3 N 4 coating structure on the CoN‐MoN fiber. From DFT calculation, an obvious electron transfer occurred at the g‐C 3 N 4 /CoN‐MoN interface, which not only improves the hydrolytic dissociation ability but also optimizes its Gibbs free energy of hydrogen (ΔG H* ). Compared with the ΔG H* of g‐C 3 N 4 and CoN‐MoN/CF, g‐C 3 N 4 @CoN‐MoN/CF showed a suitable ΔG H* of −2.97 eV, which is relatively close to the ideal ΔG H* (0 eV). Moreover, the H─O─H bond angle of adsorbed water on g‐C 3 N 4 @CoN‐MoN/CF increased to 105.47°, and the H─O bond was extended to 1.009 Å, which facilitates the breaking of the H─O bond, thus reducing H* to H 2 .

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