Channel-Rich RuCu Nanosheets for pH-Universal Overall Water Splitting Electrocatalysis
Qing Yao +1, Bolong Huang+2 , Nan Zhang1, Mingzi Sun2, Qi Shao1, and Xiaoqing Huang*1（黄小青）
1 College of Chemistry, Chemical Engineering and Materials Science Soochow University Ren’ai Road 199, 215123, Soochow (China)
2 Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom, Kowloon (Hong Kong SAR)
+ These authors contributed equally.
Angew. Chem. Int. Ed. 2019, 58, 13983--13988
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-3508C and RuCu NSs/C-2508C 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 1m KOH, 0.1m KOH, 0.5m H2SO4 and 0.05m H2SO4 , respectively, much lower than those of commercial Ir/C k Pt/C. The optimized electrolyzer exhibits superior durability with small potential change after up to 45 h in 1m KOH, showing a class of efficient functional electrocatalysts for overall water splitting.