Cu2O/Reduced Graphene Oxide Nanocomposites for Electrocatalytic Overall Water Splitting
- Authors
- Nallal, Muthuchamy; Park, Kang Hyun; Park, Sungkyun; Kim, Jaeyong; Shenoy, Sulakshana; Chuaicham, Chitiphon; Sasaki, Keiko; Sekar, Karthikeyan
- Issue Date
- Nov-2022
- Publisher
- American Chemical Society
- Keywords
- hierarchical Cu2O; RGO; photoredox; bifunctional electrocatalyst; HER and OER; sustainable hydrogen
- Citation
- ACS Applied Nano Materials, v.5, no.11, pp.17271 - 17280
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Applied Nano Materials
- Volume
- 5
- Number
- 11
- Start Page
- 17271
- End Page
- 17280
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/191100
- DOI
- 10.1021/acsanm.2c04491
- ISSN
- 2574-0970
- Abstract
- Hierarchical Cu2O/RGO nanocomposites were synthesized via a sustainable photoredox strategy and utilized as bifunctional electrocatalysts for oxygen and hydrogen evolution reactions (OER and HER) under alkaline conditions. The photoredox Cu2O/RGO electrocatalyst has potential for bifunctional electrocatalytic applications, owing to their small overpotentials (OER: 215 mV and HER: 142 mV), fast kinetics, Tafel slope of 58.2 mV dec-1, high mass performance (613.49 A g-1), high exchange current density (10.9 mA cm-2), long-term stability, and maximum Faradaic efficiency of 97% compared with hierarchical Cu2O, in situ synthesized Cu2O/RGO-1 catalyst, and most electrocatalysts reported thus far. The Cu2O/RGO-2 (+) ∥ Cu2O/RGO-2 (-) cell exhibits excellent durability for overall water splitting compared to the existing benchmark Pt@C (+) ∥ IrO2 (-) cell. This study presents a sustainable approach toward hydrogen fuel generation via overall water splitting and other catalytic and electrocatalytic applications.
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