An efficient g-C3N4-decorated CdS-nanoparticle-doped Fe3O4 hybrid catalyst for an enhanced H2 evolution through photoelectrochemical water splitting
- Authors
- Reddy A.S.; Kim J.
- Issue Date
- May-2020
- Publisher
- Elsevier B.V.
- Keywords
- CdS nanoparticle; Fe3O4 nanocube; g-C3N4; Melamine; Photoelectrochemical water splitting; Thiourea
- Citation
- Applied Surface Science, v.513
- Journal Title
- Applied Surface Science
- Volume
- 513
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/26428
- DOI
- 10.1016/j.apsusc.2020.145836
- ISSN
- 0169-4332
- Abstract
- We developed a highly efficient and stable g-C3N4-decorated CdS-nanoparticle-doped Fe3O4 nanocube catalyst, g-C3N4@CdS–Fe3O4 (gCNCSF), with a two-step solvo-thermal process in an aqueous phase. It enhanced H2 evolution via photoelectrochemical (PEC) water splitting. Melamine and isolated onion leaf extract were used to prepare g-C3N4 by calcination under an N2 atmosphere at 450 °C. Subsequently, a CdS@Fe3O4 catalyst was fabricated by doping CdS nanoparticles into the interfacial layers of Fe3O4, via a hydrothermal method, following calcination at 450 °C under N2. According to the PEC analysis, the gCNCSF catalyst exhibited a photo-current density of 0.023 mA/cm2, approximately 2.5 and 6.25 times higher than those of binary hybrids g-C3N4@CdS and CdS@Fe3O4, respectively. In addition, approximately 4.1 and 27.7 times higher performance has been recorded than those of neat CdS and g-C3N4, respectively. This was at an applied bias potential of 0.2 V vs. Ag/AgCl. The high rate of H2 evolution could be attributed to the interfacial coordination between g-C3N4 and CdS nanoparticles doped in the Fe3O4 nanocubes, which eventually promoted the bandgap-dependent interfacial charge transfer. © 2020 Elsevier B.V.
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