Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 4, Pages 3880-3888Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b17961
Keywords
nanoporous materials; cobalt pentlandite; overall water splitting; neutral water; hydrogen evolution reaction
Funding
- JST-CREST Phase Interface Science for Highly Efficient Energy Utilization, Japan Science and Technology Agency
- World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials, MEXT, Japan
- Whiting School of Engineering, Johns Hopkins University
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Significant progress has recently been achieved in developing noble-metal-free catalysts for electrochemical water splitting in acidic and alkaline electrolytes. However, high-performance bifunctional catalysts toward both hydrogen evolution and oxygen oxidation reactions of neutral water have not been realized in spite of the technical importance for electrochemical hydrogen production in natural environments powered by renewable energy sources of wind, solar, and so on. Here, we report a nanoporous Co9S4P4 pentlandite with three-dimensional bicontinuous nanoporosity for electrochemical water splitting in neutral solutions. The three-dimensional binder-free catalyst shows a negligible onset overpotential, low Tafel slope, and excellent poisoning tolerance for hydrogen evolution reaction, comparable to or even better than commercial Pt catalysts. Remarkably, the new catalyst also has excellent catalytic activities toward oxygen evolution and, hence, can be used as both anode and cathode for overall neutral water splitting. These extraordinary catalytic activities toward neutral water splitting have never been obtained from non-noble-metal catalysts before. The bifunctional and low-cost catalyst holds great promise for practical applications in electrochemical water splitting in natural environments.
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