Journal
ACS CATALYSIS
Volume 12, Issue 12, Pages 6958-6967Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c00751
Keywords
single atoms; overall water splitting; synergistic effects; spillover; photocatalysis
Categories
Funding
- National Natural Science Foundation of China [22072045, 21603073, 21574043]
- Ministry of Science and Technology of the People's Republic of China [2018YFC1602800]
- Xing-Fu-Zhi-Hua Foundation of ECNU
- Microscale Magnetic Resonance Platform of ECNU
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This study presents a two-component synergistic photocatalyst consisting of dispersed single-atom Co centers and PtCo alloy nanoparticles. The combination exhibits excellent activity for the photocatalytic water splitting reaction, bridging the gap between atom utilization and bifunctional activities. It provides a promising model for the development of atomically dispersed catalysts in the field of overall photocatalytic water splitting.
Atomically dispersed catalysts with maximum efficiencies for atom utilization have emerged as a frontier in the catalytic field. However, single- component monatomic catalysts are rarely reported for the overall photocatalytic water splitting reaction (OWS). Herein, a two-component synergistic photocatalyst was designed that contained a dispersion of single-atom Co (Co-SAs) centers and PtCo alloy nanoparticles (Nps), which were supported over C3N4 nanosheets. Among these components, Co-SAs centers act as highly active sites for the hydrogen evolution reaction (HER), and PtCo alloys act as highly active sites for the oxygen evolution reaction (OER). A synergistic effect between them occurs when the two different reactive centers are combined, indicating that there may be a spillover phenomenon of protons or hydroxyl groups between the Co-SAs, centers and PtCo alloy NPs. The synergistic promotion of Co-SAs centers and PtCo alloys bridges the gap between achieving maximum atom utilization and optimal bifunctional activities for OWS reactions. This combination provides a promising model for the development of OWS by atomically dispersed catalysts.
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