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- Title
Palladium Phosphide as a Stable and Efficient Electrocatalyst for Overall Water Splitting.
- Authors
Luo, Fang; Zhang, Quan; Yu, Xinxin; Xiao, Shenglin; Ling, Ying; Hu, Hao; Guo, Long; Yang, Zehui; Huang, Liang; Cai, Weiwei; Cheng, Hansong
- Abstract
A palladium phosphide electrocatalyst supported on carbon black (PdP2@CB) shows efficient water splitting in both alkaline and neutral electrolytes. Significantly lower overpotentials are required for PdP2@CB (27.5 mV in 0.5 m H2SO4; 35.4 mV in 1 m KOH; 84.6 mV in 1 m PBS) to achieve a HER electrocatalytic current density of 10 mA cm−2 compared to commercial Pt/CB (30.1 mV in 0.5 m H2SO4; 46.6 mV in 1 m KOH; 122.7 mV in 1 m PBS). Moreover, no loss in HER activity is detectable after 5000 potential sweeps. Only 270 mV and 277 mV overpotentials are required to reach a current density of 10 mA cm−2 for PdP2@CB to catalyze OER in 1 m KOH and 1 m PBS electrolytes, which is better OER activity than the benchmark IrO2 electrocatalyst (301 mV and 313 mV to drive a current density of 10 mA cm−2). 1.59 V and 1.72 V are needed for PdP2@CB to achieve stable water splitting catalytic current density of 10 mA cm−2 in 1 m PBS and 50 mA cm−2 in 1 m KOH for 10 h, respectively.
- Subjects
PALLADIUM catalysts; PHOSPHIDES; ELECTROCATALYSTS; WATER electrolysis; CATALYST supports; CARBON-black
- Publication
Angewandte Chemie, 2018, Vol 130, Issue 45, p15078
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201810102