Abstract
AbstractTransition metal dichalcogenides (TMDCs), MoS2, and WS2 have emerged as low‐cost and earth‐abundant electrocatalysts for hydrogen evolution reaction (HER). In this work, electrocatalytic HER performance of these TMDCs, supported by few layered graphene and loaded on a 3D framework of Ni foam (Gr/NF), is reported. The graphene in Gr/NF is prepared from inexpensive camphor by atmospheric pressure chemical vapor deposition. The graphene‐supported TMDCs anchored on the Ni foam are demonstrated with a low overpotential for HER below 200 mV at a current density of 10 mA cm−2 which is comparable to their edge terminated counterparts and surpassing that of unsupported bulk or amorphous TMDCs. In addition, their small Tafel slopes (95 and 83 mV dec−1 for MoS2‐ and WS2‐based Gr/NF electrocatalysts, respectively), charge transfer resistance, and long‐term stability make them promising non‐noble electrocatalysts. First principle investigations of the (Mo/W)S2/Gr/NF heterostructure shows that their enhanced electrocatalytic activity can be attributed to the d‐band shift in the transition metals, Mo/W (a larger shift for WS2) by Ni, promoting unoccupied antibonding orbitals which facilitate the hydrogen adsorption–desorption process.
Published Version
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