期刊
NANO ENERGY
卷 78, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105185
关键词
Oxygen evolution reaction; Defective RuO2; Confined oxygenation; Graphene; Heterostructure
类别
资金
- National Key R&D Program of China [2016YFA0200200]
- National Natural Science Foundation of China of China [51702078, 51872283]
- Liaoning BaiQianWan Talents Program
- Liao Ning Revitalization Talents Program [XLYC1807153]
- Natural Science Foundation of Liaoning Province
- Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science [20180510038]
- DICP [DICP ZZBS201802, DICP ZZBS201708, DICP I202032]
- DICPQIBEBT [DICPQIBEBT UN201702]
- DNL Cooperation Fund, CAS [DNL180310, DNL180308, DNL201912, DNL201915]
- Hebei Provincial Department of Education Foundation [BJ2019016]
- China Postdoctoral Science Foundation [2018M640262]
Exploring highly active and stable oxygen evolving electrocatalysts is the key for electrochemical water splitting and renewable chemical conversion. RuO2 is one of the benchmark oxygen evolving electrocatalysts, but remains challenging in high activity in all-pH electrolytes. Herein, we report a confined oxygenation strategy using the finite oxygen species from graphene oxide to synthesize two dimensional (2D) heterostructures of intrinsically defective RuO2 nanocrystals uniformly grown on graphene (2D D-RuO2/G), showing ultrathin thickness of 9 nm, high specific surface area of 125 m(2) g(-1), enriched hydroxylated surface and notably intrinsic defective RuO2 with low Ru-O coordination number of 5. Consequently, 2D D-RuO2/G exhibits a robust stability and an extraordinary oxygen evolution reaction (OER) performance both in acidic and alkaline solutions, achieving a current density of 10 mA cm(-2) at the overpotential of 169 and 175 mV, and a water oxidation turn over frequency of 1.07 and 1.25 S-1 at 270 mV, respectively, corresponding to 344 mV of total overpotential at 10 mA cm(-2) in acidic and alkaline electrolytes, which greatly exceeds the state-of-the-art of pH-universal OER electrocatalysts. Theoretical studies indicate that intrinsic defective Ru sites can enhance the adsorption and accelerate the decomposition of hydroxyl groups to boost the OER activity. This confined oxygenation strategy provides the opportunities to construct 2D advanced defective OER electrocatalysts in all-pH electrolytes.
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