Journal
CHEMICAL ENGINEERING JOURNAL
Volume 430, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133117
Keywords
Heterojunction; Hydrogen evolution reaction; Oxygen evolution reaction; Overall water splitting; Large current density
Categories
Funding
- National Natural Science Foundation of China [21872040, 22162004]
- Opening Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensi-fication Technology [2020K011]
- Hundred Talents Program of Guangxi Universities
- Excellent Scholars and Innovation Team of Guangxi Universities
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Efficient and robust bifunctional catalysts based on Ru have great potential for water electrolysis. The NiO/RuO2/NF catalyst exhibits good activity and stability for oxygen and hydrogen evolution reactions, requiring only 1.44V for overall water splitting and maintaining steady operation for 72 hours.
It is of great potential to develop efficient and robust Ru based bifunctional catalysts for water electrolysis. In this work, NiO/RuO2 heterojunction nano-sheets in situ grown on nickel foam (NiO/RuO2/NF) is successfully prepared, which shows good activity and stability for both oxygen and hydrogen evolution reaction (OER and HER). For overall water splitting (OWS), it only needs 1.44 V to obtain 10 mA cm-2 in 1.0 M KOH solution. Notably, it can work for 72 h at +/- 1,500 mA cm-2 toward OER, HER and OWS with small activity decrease. Under simulated industrial conditions, 1.90 V is needed to drive 1,500 mA cm-2, and it also can work steadily for 72 h. The reason could be attributed to the heterogeneous interface coupling effect and nano-sheets with rough surface directly grown on NF. Hence, this work provides a feasible strategy for developing robust bifunctional Ru based water splitting catalysts.
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