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Channel‐Rich RuCu Nanosheets for pH‐Universal Overall Water Splitting Electrocatalysis
Author(s) -
Yao Qing,
Huang Bolong,
Zhang Nan,
Sun Mingzi,
Shao Qi,
Huang Xiaoqing
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201908092
Subject(s) - tafel equation , electrocatalyst , oxygen evolution , water splitting , electrolyte , electrolysis of water , electrolysis , chemical engineering , materials science , amorphous solid , chemistry , inorganic chemistry , electrochemistry , catalysis , electrode , crystallography , biochemistry , photocatalysis , engineering
Channel‐rich RuCu snowflake‐like nanosheets (NSs) composed of crystallized Ru and amorphous Cu were used as efficient electrocatalysts for oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and overall water splitting in pH‐universal electrolytes. The optimized RuCu NSs/C‐350 °C and RuCu NSs/C‐250 °C show attractive activities of OER and HER with low overpotentials and small Tafel slopes, respectively. When applied to overall water splitting, the optimized RuCu NSs/C can reach 10 mA cm −2 at cell voltages of only 1.49, 1.55, 1.49 and 1.50 V in 1 m KOH, 0.1 m KOH, 0.5 m H 2 SO 4 and 0.05 m H 2 SO 4 , respectively, much lower than those of commercial Ir/C∥Pt/C. The optimized electrolyzer exhibits superior durability with small potential change after up to 45 h in 1 m KOH, showing a class of efficient functional electrocatalysts for overall water splitting.