Role of Physicochemical Features toward Bifunctional Redox Activity of Transition-Metal Molybdates
In recent years, the search for non-noble metal-based bi-functional electrode materials with excellent activity and stability for overall water splitting has led the energy field research toward transition-metal (TM)-based materials that are abundant and comparatively stable over a wide range of pH....
Saved in:
Published in: | ACS sustainable chemistry & engineering 2023-09, Vol.11 (35), p.13013-13023 |
---|---|
Main Authors: | , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | In recent years, the search for non-noble metal-based bi-functional electrode materials with excellent activity and stability for overall water splitting has led the energy field research toward transition-metal (TM)-based materials that are abundant and comparatively stable over a wide range of pH. Herein, a series of late first-row TM molybdates (TMMo, TM = Co, Ni, Cu, and Zn) were studied for alkaline water splitting, where the materials were synthesized through a surfactant confinement reaction via the hydrothermal process. The microscopic analyses showed varied morphology like, fusiform, forest, disks, and rugby ball with multivalency and monoclinic/triclinic crystal structures of the TMMo materials. Among the molybdates, CoMo, with a larger number of active sites with an inequivalent atomic position in the cluster and upshifted d/p bands showed the best activity as both cathode and anode materials with the overpotentials of 280 and 408 mV, respectively, to obtain a current density of 100 mA cm–2. CoMo exhibited faster reaction kinetics over other molybdates as it had lower charge-transfer resistance with significant stability. Furthermore, a two-electrode system with CoMo as the cathode and anode provided a lower cell voltage of 1.86 V at 100 mA cm–2 current density over commercial electrode materials, indicating CoMo can be an excellent commercial alternative electrocatalyst for overall water splitting. |
---|---|
ISSN: | 2168-0485 2168-0485 |
DOI: | 10.1021/acssuschemeng.3c02780 |