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Hydrothermal Synthesis of CaMn 2 O 4 · xH 2 O Nanorods as Co‐Catalysts on GaN Nanowire Photoanode
Author(s) -
Bae Hyojung,
Kim Hyunggu,
Burungale Vishal,
Min JungWook,
Cha Anna,
Rho Hokyun,
Ryu SangWan,
Kang Soon Hyung,
Ha JunSeok
Publication year - 2021
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.12297
Subject(s) - nanorod , catalysis , nanowire , photocurrent , hydrothermal circulation , chemical engineering , overpotential , materials science , nanotechnology , chemistry , electrode , optoelectronics , electrochemistry , engineering , biochemistry
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. CaMn 2 O 4 ·xH 2 O has been extensively studied for the purpose of decreasing the overpotential in the oxygen evolution reaction. In this study, CaMn 2 O 4 ·xH 2 O was synthesized via a hydrothermal method, and loaded onto a GaN nanowire (NW) photoanode. Optimized CaMn 2 O 4 ·xH 2 O layers were decorated on GaN NWs to create CaMn 2 O 4 @GaN, which delivered a maximum photocurrent of 0.4 mA/cm 2 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/cm 2 ) of bare GaN NWs. Thus, highly efficient and stable PEC water splitting was achieved on the GaN NW photoanode.