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Palladium Phosphide as a Stable and Efficient Electrocatalyst for Overall Water Splitting
Author(s) -
Luo Fang,
Zhang Quan,
Yu Xinxin,
Xiao Shenglin,
Ling Ying,
Hu Hao,
Guo Long,
Yang Zehui,
Huang Liang,
Cai Weiwei,
Cheng Hansong
Publication year - 2018
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.201810102
Subject(s) - electrocatalyst , phosphide , water splitting , electrolyte , current density , materials science , palladium , chemistry , catalysis , inorganic chemistry , analytical chemistry (journal) , electrochemistry , electrode , physics , quantum mechanics , chromatography , biochemistry , photocatalysis
A palladium phosphide electrocatalyst supported on carbon black (PdP 2 @CB) shows efficient water splitting in both alkaline and neutral electrolytes. Significantly lower overpotentials are required for PdP 2 @CB (27.5 mV in 0.5 m H 2 SO 4 ; 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 H 2 SO 4 ; 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 PdP 2 @CB to catalyze OER in 1 m KOH and 1 m PBS electrolytes, which is better OER activity than the benchmark IrO 2 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 PdP 2 @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.