Wang, Jingyi; Feng, Jianrui; Li, Yuying; Lai, Feili; Wang, Gui-Chang; Liu, Tianxi; Huang, Jiajia; Wang, Jingyi; Feng, Jianrui; Li, Yuying; Lai, Feili; Wang, Gui-Chang; Liu, Tianxi; Huang, Jiajia; He, Guanjie; - view fewer (2023) Multilayered Molybdate Microflowers Fabricated by One-Pot Reaction for Efficient Water Splitting. Advanced Science , Article e2206952. 10.1002/advs.202206952. (In press).

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Abstract

The development of high-performance, low-cost and rapid-production bifunctional electrocatalysts towards overall water splitting still poses huge challenges. Herein, the authors utilize a facile hydrothermal method to synthesize a novel structure of Co-doped ammonium lanthanum molybdate on Ni foams (Co-ALMO@NF) as self-supported electrocatalysts. Owing to large active surfaces, lattice defect and conductive channel for rapid charge transport, Co-ALMO@NF exhibits good electrocatalytic performances which requires only 349/341 mV to achieve a high current density of 600 mA cm-2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Besides, a low cell voltage of 1.52 V is required to reach the current density of 10 mA cm-2 in alkaline medium along with an excellent long-term stability for two-electrode configurations. Density functional theory calculations are performed to reveal the reaction mechanism on Co-ALMO@NF, which shows that the Mo site is the most favorable ones for HER, while the introduction of Co is beneficial to reduce the adsorption intensity on the surface of Co-ALMO@NF, thus accelerating OER process. This work highlighted the importance of the structural design for self-supporting electrocatalysts.

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