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Palladium Phosphide as a Stable and Efficient Electrocatalyst for Overall Water Splitting.
Fang Luo1, Quan Zhang1, Xinxin Yu1
1Sustainable Energy Laboratory, Faculty of Materials Science and Chemistry, China University of Geosciences Wuhan, 388 Lumo RD, Wuhan, 430074, China.
Angewandte Chemie (International Ed. in English)
|September 22, 2018
Summary
A novel palladium phosphide electrocatalyst (PdP2 @CB) demonstrates superior performance for water splitting. This advanced catalyst requires lower overpotentials for both hydrogen and oxygen evolution reactions, outperforming commercial platinum and iridium benchmarks.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Efficient electrocatalysts are crucial for water splitting, a key process for sustainable hydrogen production.
- Developing cost-effective and high-performance alternatives to precious metal catalysts like platinum and iridium is an ongoing challenge.
Purpose of the Study:
- To synthesize and characterize a palladium phosphide electrocatalyst supported on carbon black (PdP2 @CB).
- To evaluate the electrocatalytic activity and stability of PdP2 @CB for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in various electrolytes.
- To compare the performance of PdP2 @CB with commercial benchmarks like Pt/CB and IrO2.
Main Methods:
- Electrochemical synthesis and characterization of palladium phosphide nanoparticles on carbon black support.
- Electrocatalytic performance evaluation using techniques such as cyclic voltammetry and chronoamperometry in acidic, alkaline, and neutral electrolytes.
- Durability testing through extended potential cycling and long-term electrolysis.
Main Results:
- PdP2 @CB exhibited significantly lower overpotentials for HER compared to commercial Pt/CB across different electrolytes (e.g., 27.5 mV vs. 30.1 mV in 0.5 M H2 SO4 at 10 mA cm-2).
- The catalyst demonstrated excellent HER stability, with no activity loss after 5000 potential sweeps.
- PdP2 @CB showed superior OER activity compared to IrO2, requiring lower overpotentials (e.g., 270 mV vs. 301 mV in 1 M PBS at 10 mA cm-2).
- Stable water splitting was achieved at low voltages (1.59 V in 1 M PBS and 1.72 V in 1 M KOH) for extended periods.
Conclusions:
- Palladium phosphide supported on carbon black is a highly efficient and stable electrocatalyst for both HER and OER.
- PdP2 @CB presents a promising, cost-effective alternative to precious metal catalysts for electrochemical water splitting.
- The catalyst's robust performance in various electrolytes highlights its potential for practical hydrogen production applications.
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