Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 125, Issue 42, Pages 23153-23161Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c06595
Keywords
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Funding
- National Key Research and Development Program of China [2017YFA0402800]
- National Natural Science Foundation of China [51925206, 21971229, U1932214]
- National Synchrotron Radiation Laboratory at USTC
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This study successfully fabricated an organo-inorganic hybrid photoanode with high photocurrent density and stability. Further investigations revealed that NiFe MOFs and molecular cobaloxime cocatalyst effectively facilitate charge separation and improve water oxidation kinetics, respectively.
It is a great challenge to develop efficient artificial photosynthesis systems by mimicking natural photosynthesis. In this present work, an organo-inorganic hybrid photoanode was fabricated by depositing ultrathin NiFe MOF nanolayers and molecular cobaloxime cocatalyst on the surface of Ti-doped porous hematite (Ti-PH). This hybrid photoanode exhibited a high photocurrent density of 2.45 mA/cm(2) at 1.23 V vs the reversible hydrogen electrode (RHE) under AM 1.5 G illumination with excellent stability. Moreover, the optimal incident photon-to-current efficiency (IPCE) of the hybrid photoanode reached 83.0% at 365 nm and the surface charge injection efficiency (eta(inj)) was improved to 87.5% at 1.23 V vs RHE. Detailed investigations reveal that NiFe MOFs can effectively facilitate charge separation as a hole-transport layer and molecular cobaloxime cocatalyst can passivate surface trap states to increase water oxidation kinetics.
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