CoMoO4 enhanced anodized cobalt oxide nanotube as an efficient electrocatalyst for hydrogen evolution reaction

• Published in: Applied surface science Vol. 579; p. 152128
• Main Authors: Wang, Rundong, Li, Feng, Ji, Jing, Wang, Feng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.03.2022
• Subjects: Anodic cobalt oxide; Cobalt molybdate; Electrocatalytic hydrogen evolution; Tubular structure; Tubular structure; Anodic cobalt oxide; Electrocatalytic hydrogen evolution; Cobalt molybdate
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2021.152128

[Display omitted] •Nanotube array of anodic cobalt oxide (ACO) is prepared by a simple anode oxidation technique without any energy-intensive and time-consuming process.•CoMoO4 nanosheets are deposited on ACO to promote the HER catalytic activity.•The tubular structure of ACO offers nucleating and growing sites for precursor of CoMoO4.•The tubular structure of ACO has a positive effect on the exposure of active sites of CoMoO4.•CoMoO4/ACO exhibits an excellent electrocatalytic HER performance in 1 M KOH. We fabricate Co3O4 nanotube on Co foil (ACO) by using anode oxidation technique. Hydrangea-like CoMoO4 is then prepared on the anodic cobalt oxide (ACO) matrix for enhancement of the catalytic activity towards hydrogen evolution reaction (HER). More importantly, the tubular structure of ACO not only allows more CoMoO4 to grow, but also offers nucleating and growing sites for precursor of CoMoO4, and thus forming fascicular CoMoO4 nanosheets. Benefiting from the structural hierarchy and integrity of the electrode, the optimized catalyst exhibits an excellent HER activity with only 78 mV overpotential at −10 mA/cm2 in alkaline solution. Additionally, the electrode displays good stability during the long-term reaction, over 28 h at constant current or constant voltage, exhibiting promising potential in hydrogen production via. water splitting.