Bimetallic Ni–Mo nitride@N-doped C as highly active and stable bifunctional electrocatalysts for full water splitting. (6th June 2022)

• Record Type: Journal Article
• Authors: Zhang, Yu; Zhang, Baiqing; Yin, Zhuoxun; Ma, Xinzhi; Zhou, Yang
• Is Part Of: New journal of chemistry. Volume 46:Number 24(2022)
• Page Start: 11893
• Page End: 11901
• Publication Date: 2022-06-06
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj01303g
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : NiMoN-2 nanosheets were used as bifunctional catalysts and exhibited high total water decomposition activity. Only a cell voltage of 1.58 V was required to attain a current density of 10 mA cm −2 . Abstract : Designing low-cost, highly active and stable electrocatalysts is important to various renewable energy storage and conversion devices. We fabricated a NiMoN nanosheet hybrid catalyst through a reduction reaction of NiMoO4 nanosphere and urea under high-temperature annealing. The effects of annealing temperature on the surface chemical compositions of the catalyst were investigated, and it was found that the relative contents of various N-type species, Ni and Mo changed with the temperature. The relative contents of metal–N, metallic Ni, Mo 3+ and Mo 4+ cations were increasing with the temperature increment, and significantly improved the activity of electrocatalytic water splitting. To drive a current density of 10 mA cm −2, the bimetallic NiMoN requires an overpotential of 202 mV and 191 mV for the OER and HER, respectively. The two-electrode system using the NiMoN needs a very low cell potential of 1.58 V to reach a current density of 10 mA cm −2 . The catalyst also shows high durability in the case of 40 hours, while the overpotential is only slightly attenuated. The superior activity and long-term stability demonstrate that the NiMoN catalyst has promising potential for application in large-scale water splitting.