Sulfur Recovery Assisted Electrochemical Water Splitting for H<sub>2</sub> Production Using CoMo-Based Nanorod Arrays Catalysts
Jinyan Huo, Qing Liu, Xiaofang Liu, Xue‐Feng Cheng, Dongyun Chen, Najun Li, Kin Liao, Qingfeng Xu, Jianmei Lu
Abstract
Swapping the sluggish oxygen evolution reaction (OER) for the thermodynamically advantageous sulfur ion oxidation reaction (SOR) makes it possible to produce low-energy hydrogen. We report here on an electrocatalytic SOR-coupled HER system that allows for the joint production of sulfur and hydrogen. We prepare a CoMoO 4 nanoarray on nickel foam (NF) for anodic SOR and N-doped CoMoO 4 /NF, CoMoN/NF, for cathodic HER. The current density of 100 mA cm –2 was obtained at 0.29 V (vs RHE) in the SOR process. After nitridation, the electrode can achieve a current density of 10 mA cm –2 in HER at a voltage of only 32 mV (vs RHE). The coupling system (SOR//HER) can run steadily for 150 h. Detailed exploration and discussion were conducted on the pathways of SOR. This work develops an energy-efficient mixed water electrolysis system for H 2, providing a viable option for toxic waste treatment.