Abstract
This work spotlights the facile method to deposit cobalt oxide (CoOx) nanoparticles as a cocatalyst on Fe-MOF-bpdc to enhance its photocatalytic activity for water oxidation reaction (WOR) under visible light irradiation to evolve gaseous O2. Due to the soft conditions needed for the process developed, the framework structure of Fe-MOF-bpdc was maintained even after the deposition of CoOx. The optimized CoOx@Fe-MOF-bpdc composite showed enhanced activity towards visible-light-driven WOR as compared to pristine Fe-MOF-bpdc, the amount of evolved O2 being increased by about 2 times at the maximum with CoOx loading of 2 wt% as Co metal. Investigations on the wavelength dependence of visible-light-driven WOR on CoOx@Fe-MOF-bpdc revealed that the direct photo-excitation of Fe-oxo clusters within Fe-MOF-bpdc plays an important role to initiate the reaction. Furthermore, it was found that the rate of 2-propanol oxidation reaction, which is a typical two-electron oxidation reaction, was hardly affected by CoOx deposition, suggesting that CoOx acts as a unique hole trapping site and more preferentially catalyse the four-electron oxidation reactions like WOR than the two-electron oxidation reaction.
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Acknowledgements
This work was financially supported by JST ACCEL, Japan (Grant No. JPMJAC1302), by the Grants-in-Aid for Scientific Research (KAKENHI) from the Ministry of Education, culture, Sports, Science and Technology of Japan (Nos. 15K17903, 15K13820 and 18K14305) and by the Global Research Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST), Korea (Grant No. 2010-00339). Z.L. acknowledges Toyota Tsusho for its financial help.
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Mine, S., Lionet, Z., Shigemitsu, H. et al. Design of Fe-MOF-bpdc deposited with cobalt oxide (CoOx) nanoparticles for enhanced visible-light-promoted water oxidation reaction. Res Chem Intermed 46, 2003–2015 (2020). https://doi.org/10.1007/s11164-019-04077-8
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DOI: https://doi.org/10.1007/s11164-019-04077-8