Hydrothermal Synthesis of CaMn2O4·xH2O Nanorods as Co‐Catalysts on GaN Nanowire Photoanode. (14th May 2021)

• Record Type: Journal Article
• Authors: Bae, Hyojung; Kim, Hyunggu; Burungale, Vishal; Min, Jung‐Wook; Cha, An‐na; Rho, Hokyun; Ryu, Sang‐Wan; Kang, Soon Hyung; Ha, Jun‐Seok
• Is Part Of: Bulletin of the Korean Chemical Society. Volume 42:Number 6(2021)
• Page Start: 938
• Page End: 944
• Publication Date: 2021-05-14
• Subjects: Water splitting -- Photoelectrochemistry -- Gallium nitride -- Calcium manganese oxide hydrates -- Hydrothermal synthesis -- Photoanode; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/bkcs.12297
• Languages: English
• ISSNs: 0253-2964

Abstract

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. CaMn2 O4 ·xH2 O has been extensively studied for the purpose of decreasing the overpotential in the oxygen evolution reaction. In this study, CaMn2 O4 ·xH2 O was synthesized via a hydrothermal method, and loaded onto a GaN nanowire (NW) photoanode. Optimized CaMn2 O4 ·xH2 O layers were decorated on GaN NWs to create CaMn2 O4 @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. Abstract : Synthetic scheme of the experimental procedure for CaMn2 O4 co‐catalysts and CaMn2 O4 @GaN samples and Schematic diagram for CaMn2 O4 @GaN.