Journal
CHEMSUSCHEM
Volume 12, Issue 12, Pages 2773-2779Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201900479
Keywords
electrocatalysis; electrodeposition; laser ablation; oxygen evolution reaction; water splitting
Funding
- Fundamental Research Funds for the Central Universities [31020195C001]
- Natural Science Basic Research Program of Shanxi Province [2019JM-192]
- Open Sharing Fund for the Large-scale Instruments and Equipment of Central South University
- Natural Science Foundation of Hunan Province, China [2018JJ3626]
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The development of simple and effective methods for the rapid preparation of electrocatalysts for overall water splitting from earth-abundant elements is an important and challenging task. A facile and ultrafast two-step method was developed to prepare a Ni/NiO@CoFe layered double hydroxide hierarchical nanostructure (NCF) within a few minutes by femtosecond laser ablation and electrodeposition. In 1 m KOH solution, the optimized NCF catalysts show a low overpotential of 230 mV for the oxygen evolution reaction (OER) at a current density of 10 mA cm(-2) with a low Tafel slope of 34.3 mV dec(-1), indicating fast and efficient OER kinetics. Owing to the synergistic effect between NiO and CoFe layered double hydroxide, the hydrogen evolution reaction performance of the NCF was also improved. The synthesized electrocatalysts were further utilized in overall water splitting with a potential of only 1.56 V at a current density of 10 mA cm(-2) and excellent durability, better than that of the commercial RuO2(+)//Pt/C(-) system. The present work provides new insights on the rapid and facile preparation of efficient electrocatalysts for overall water splitting on a large scale.
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