Synergistic Cu-Co co-doping induced electronic reconstruction in NiO nanosheet arrays toward efficient bifunctional methanol-assisted overall water splitting

초록

We discuss the in-situ development of a Cu-Co-NiO nanosheet arrays binder-free catalyst for methanol-assisted overall water splitting. Notably, the Cu-Co-NiO nanosheet arrays reveals a small overpotential of 139 mV with a methanol-assisted electrolyte and 315 mV without a methanol-assisted electrolyte at 10 mA cm−2. Interestingly, the Cu-Co-NiO nanosheet arrays catalyst also elucidates a small overpotential of 157 mV in a methanol-assisted hydrogen evolution reaction (HER), whereas 202 mV without methanol-assisted HER at −10 mA cm−2. Besides, the Co-Cu-NiO nanosheet arrays catalyst shows excellent stability for both methanol oxidation reaction (MOR) at 10 and 150 mA cm−2 and methanol-assisted HER at −10 and −150 mA cm−2 for 100 h. Furthermore, the Cu-Co-NiO || Cu-Co-NiO nanosheet arrays cell unveils a low cell potential of 1.56 V for methanol-assisted, compared to 1.75 V without methanol-assisted electrocatalytic reaction. Also, the Cu-Co-NiO || Cu-Co-NiO nanosheet arrays cell shows outstanding stability at 10 mA cm−2 and 150 mA cm−2 for 100 h in methanol-assisted overall water splitting. Overall, the Co-Cu-NiO nanosheet arrays catalyst demonstrates the effectiveness of energy-band engineering as a strategic way for designing highly catalytically active and scalable catalysts for renewable hydrogen energy generation. © 2026 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

키워드