Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 47, Pages 17520-17526Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c06782
Keywords
amorphous; bifunctional catalysts; RuO2 nanosheets; overall water splitting; large current density
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Funding
- National Natural Science Foundation of China [21872040]
- Hundred Talents Program of Guangxi Universities
- Excellent Scholars and Innovation Team of Guangxi Universities
- Open Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology [2019K004]
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Developing efficient bifunctional water electrolysis catalysts applied at large current density is desirable. Herein, an amorphous CoOx-decorated crystalline RuO2 nanosheet catalyst self-supported on nickel foam (CoOx-RuO2/NF) with high performance for both oxygen and hydrogen evolution reaction (OER and HER) is prepared successfully by hydrothermal method and annealing. The overpotentials at +/- 1500 mA cm(-2) for OER and HER are 420 and 215 mV, respectively, in 1.0 M KOH solution. Remarkably, it shows good durability with small decline in performance after 48 h durability test for OER and HER at +/- 1500 mA cm(-2). Furthermore, it only needs 1.49 V to reach 10 mA cm(-2) for overall water splitting (OWS); the decline of activity is satisfactory after 48 h durability test at 1500 mA cm(-2). The reason could be because of the sufficient active sites generated by the crystalline-amorphous combination and self-supporting nanosheet structure. This work therefore proposes an effective strategy for preparing a high-performance OWS catalyst, especially at large current density.
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