Xinhui Zhang,Aiping Wu,Dongxu Wang,Ying Xie,Aleksandr I. Gubanov,Gennadiy A. Kostin,Chungui Tian
The bi-transition-metal interstitial compounds (BTMICs) are promising for water electrolysis. The previous BTMICs are usually composed of irregular particles. Here, this work shows the synthesis of novel 1D Co 6 Mo 6 C-based heterojunction nanowires (1D Co/Co 6 Mo 6 C) with diameters about 50 nm and a length-to-diameter ratio about 20 for efficient water electrolysis. An interesting growth process based on pyrolytically “squeezing” PMo 12 (Phosphomolybdic acid)/ZIF-67 (Zeolitic Imidazolate Framework-67) cube precursor is demonstrated. The “squeezing” growth is related to the role of Mo species for isolating Co species. A series of tests and theoretical calculation show the mutual regulation of Co and Mo to optimize the electronic structure, accelerating H 2 O dissociation and the reduction kinetics of H + . Additionally, the nanowires provide pathways for electron transfer and the transmission of reactants. Consequently, the 1D Co/Co 6 Mo 6 C exhibits high activity for hydrogen evolution reaction ( η 10 of 31 mV) and oxygen evolution reaction ( η 10 of 210 mV) in 1 m KOH. The electrolytic cell based on 1D Co/Co 6 Mo 6 C requires a low voltage of 1.43 V to drive 10 mA cm −2 . The catalyst also exhibits good HER performance in 1 m phosphate-buffered saline solution, exceeding Pt/C at a current density >42 mA cm −2 .
Shuo Geng,Shichong Xu,Yong Sheng Yu,Weiwei Yang,Ming Feng,Haibo Li
It is important to develop highly efficient and durable electrocatalysts for overall water splitting in industry application. Herein, we synthesized a novel 1D pea-like nitrogen-doped bimetallic carbide (N-Co 6 Mo 6 C) nanorods . Benefiting from the synergistic effect of N doping and good conductivity of the thin amorphous carbon shell on the surface of N-Co 6 Mo 6 C, the N-Co 6 Mo 6 C shows remarkable activity for both hydrogen evolution reaction (HER) in acid and alkaline solution and oxygen evolution reaction (OER) in alkaline solution, respectively. Furthermore, using the N-Co 6 Mo 6 C as both the anode and the cathode for overall water splitting, a cell voltage of only 1.58 V is needed to derive a current density of 10 mA/cm 2 . This work offers a new insight for the design of the non-noble bimetallic carbide with excellent electrocatalytic performance for overall water splitting.
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