Boosting hydrogen production of uniform CuCo-ZIF nanododecahedrons by bimetal node and glycerol

Wang, Q.; Teng, Y.; Ma, B.; Zhang, X.; Yuan, X.; Li, Z.; Jiang, W.; Teng, F.; Ruan, W.; Ibhadon, A. O.

Abstract

Compared with fossil fuels reforming to hydrogen, electrolytic water to hydrogen is highly energy-intensive. It is still a big challenge to decrease the cost of electrolytic water to hydrogen. Herein, we investigate the electrocatalytic activity of uniform bimetal zeolite imidazole framework (CuxCoy-ZIFs, x: y = 1:3, 1:1, 3:1 mol ratio) nanododecahedrons. Bimetal CuxCoy-ZIFs show an obviously higher oxygen evolution reaction (OER) activity than ZIF-67, which is mainly attributed to the synergistic effect of Co and Cu. The Cu doping accelerates electron transfer and optimizes the electron structure of Co. In addition, the in-situ generated hydroxides/oxides (Co(OH)2, Cu(OH)2 Co3O4, Cu2O) during electrocatalytic reaction may be the main active sites are for ZIF-67 and CuxCoy-ZIF. Meanwhile, density functional theory calculations demonstrate that H+ and OH− adsorptions on Cu1Co1-ZIF are more favorable thermodynamically than that on ZIF-67. Furthermore, when OER is substituted by glycerol oxidation reaction (GOR), the anodic GOR current increases by 8.9 times than OER current. Compared with OER-based electrolyzer, the cell voltage of GOR-based electrolyzer has decreased by 18.81%, and its Faradaic efficiency rises to 94.4%. The innovative system can efficiently produce hydrogen at an ultra-low electric energy consumption and a high conversion of energy.

Citation

Wang, Q., Teng, Y., Ma, B., Zhang, X., Yuan, X., Li, Z., Jiang, W., Teng, F., Ruan, W., & Ibhadon, A. O. (2023). Boosting hydrogen production of uniform CuCo-ZIF nanododecahedrons by bimetal node and glycerol. Materials Today Chemistry, 28, Article 101359. https://doi.org/10.1016/j.mtchem.2022.101359

• Journal Article Type: Article
• Acceptance Date: Dec 22, 2022
• Online Publication Date: Jan 9, 2023
• Publication Date: Mar 1, 2023
• Deposit Date: Jan 9, 2023
• Journal: Materials Today Chemistry
• Electronic ISSN: 2468-5194
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 28
• Article Number: 101359
• DOI: https://doi.org/10.1016/j.mtchem.2022.101359
• Public URL: https://hull-repository.worktribe.com/output/4174184