Hydrothermal Synthesis of CaMn2O4·xH2O Nanorods as Co-Catalysts on GaN Nanowire Photoanode

Abstract
Co-catalysts play a crucial role in photoelectrochemical (PEC) water splitting reactions by improving slow kinetics and reducing surface recombination, thereby enhancing PEC performance. However, achieving a well-defined interface between low-dimensional semiconductors and co-catalysts is challenging due to difficulties in depositing a uniform co-catalyst layer and attaining mixed and disordered states. CaMn2O4·xH2O has been extensively studied for the purpose of decreasing the overpotential in the oxygen evolution reaction. In this study, CaMn2O4·xH2O was synthesized via a hydrothermal method, and loaded onto a GaN nanowire (NW) photoanode. Optimized CaMn2O4·xH2O layers were decorated on GaN NWs to create CaMn2O4@GaN, which delivered a maximum photocurrent of 0.4 mA/cm2 at 0 V vs. the Ag/AgCl reference electrode under an AM 1.5 G solar simulator, 1.6-fold higher than that (0.25 mA/cm2) of bare GaN NWs. Thus, highly efficient and stable PEC water splitting was achieved on the GaN NW photoanode.

Citation
Bae, H., Kim, H., Burungale, V., Min, J., Cha, A., Rho, H., … Ha, J. (2021). Hydrothermal Synthesis of

          CaMn
          2
          O
          4
        
        ·
        
          xH
          2
          O
        
        Nanorods as Co-Catalysts on
        GaN
        Nanowire Photoanode. Bulletin of the Korean Chemical Society. doi:10.1002/bkcs.12297<br><br><h5>Acknowledgements</h5>This research was financially supported by the Ministry of Trade, Industry and Energy (MOTIE) and the Korean Institute for Advancement of Technology (KIAT) through the International Cooperative R&D program (No. P0006851) and Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2018R1A6A1A03024334) and Basic Science Research Capacity Enhancement Project through Korea Basic Science Institute (Energy Convergence Core Facility) grant funded by the Ministry of Education (2019R1A6C1030006).<br><br><h5>Publisher</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.publisher=Wiley,equals">Wiley</a><br><br><h5>Journal</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.journal=Bulletin of the Korean Chemical Society,equals">Bulletin of the Korean Chemical Society</a><br><br><h5>DOI</h5><a href="https://doi.org/10.1002/bkcs.12297">10.1002/bkcs.12297</a><br><br><h5>Additional Links</h5>https://onlinelibrary.wiley.com/doi/10.1002/bkcs.12297</span>
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