Trinary metal oxides of Co, Ni, and Mn as efficient overall water splitting catalyst

• Published in: Ionics Vol. 30; no. 4; pp. 2287 - 2298
• Main Authors: Lin, Jie, Ding, Yihong, Jin, Huile, Zeng, Tianbiao
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2024; Springer Nature B.V
• Subjects: Aqueous solutions; Catalysts; Chemistry; Chemistry and Materials Science; Cobalt oxides; Condensed Matter Physics; Electrocatalysts; Electrochemistry; Electrode materials; Electrolysis; Energy Storage; Hydrogen evolution reactions; Hydrogen production; Lithium-ion batteries; Manganese; Metal oxides; Nickel; Optical and Electronic Materials; Oxygen evolution reactions; Rechargeable batteries; Renewable and Green Energy; Transition metal oxides; Water splitting; Water electrolysis; Nickel, manganese co-doped Co; Ternary metal oxides; O
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-024-05396-6

The development of inexpensive, highly effective and durable electrocatalysts for hydrogen production via water electrolysis is of paramount importance. Transition metal oxides, owing to their simplicity in preparation and cost-effectiveness, have been widely investigated, particularly cobalt, nickel, and manganese oxides. Inspired by the synergies of the ternary cathode materials of lithium-ion batteries (LiNi x Mn y Co 1- x - y O 2 , NMC), a simple and feasible method was used to prepare a graphite plate as the support, and Ni and Mn were co-doped with Co 3 O 4 as an efficient water decomposition catalyst. Experimental studies indicated that the 10% Ni and 10% Mn co-doped Co 3 O 4 (Co 2.4 Ni 0.3 Mn 0.3 O 4 , CNM-811) exhibited the lowest overpotential in the oxygen evolution reaction (OER), with CNM-811 achieving an overpotential of 338 mV at 30 mA cm −2 in NaOH aqueous solution, the Tafel slope is 79.71 mV dec −1 . In the hydrogen evolution reaction (HER), an overpotential of 190 mV was attained at 10 mA cm −2 . In overall water splitting, a cell voltage of 2.048 V was achieved at 100 mA cm −2 , which was superior to many analogous catalysts reported today.