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Yoon KY, Lee JS, Kim K, et al. Hematite-based photoelectrochemical water splitting supported by inverse opal structures of graphene. ACS Appl Mater Interfaces. 2014;6(24):22634-9doi: 10.1021/am506721a.
Yoon, K. Y., Lee, J. S., Kim, K., Bak, C. H., Kim, S. I., Kim, J. B., & Jang, J. H. (2014). Hematite-based photoelectrochemical water splitting supported by inverse opal structures of graphene. ACS applied materials & interfaces, 6(24), 22634-9. https://doi.org/10.1021/am506721a
Yoon, Ki-Yong, et al. "Hematite-based photoelectrochemical water splitting supported by inverse opal structures of graphene." ACS applied materials & interfaces vol. 6,24 (2014): 22634-9. doi: https://doi.org/10.1021/am506721a
Yoon KY, Lee JS, Kim K, Bak CH, Kim SI, Kim JB, Jang JH. Hematite-based photoelectrochemical water splitting supported by inverse opal structures of graphene. ACS Appl Mater Interfaces. 2014 Dec 24;6(24):22634-9. doi: 10.1021/am506721a. Epub 2014 Dec 03. PMID: 25469502.
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ACS Appl Mater Interfaces. 2014 Dec 24;6(24):22634-9. doi: 10.1021/am506721a. Epub 2014 Dec 03.

Hematite-based photoelectrochemical water splitting supported by inverse opal structures of graphene.

ACS applied materials & interfaces

Ki-Yong Yoon, Jung-Soo Lee, Kwanghyun Kim, Chang Hong Bak, Sun-I Kim, Jin-Baek Kim, Ji-Hyun Jang

Affiliations

  1. School of Energy and Chemical Engineering, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Korea.

PMID: 25469502 DOI: 10.1021/am506721a

Abstract

By coupling α-Fe2O3 with a 3D graphene inverse opal (3D-GIO) conducting electrode, the short diffusion length of carriers and low absorption coefficient in α-Fe2O3 for photoelectrochemical applications were successfully addressed. GIO was directly grown on FTO substrate under low temperature conditions, removing the need for a graphene transfer process. α-Fe2O3 nanoparticles (NPs) were hydrothermally deposited on the surface of GIO, creating α-Fe2O3/GIO. The photocurrent density of α-Fe2O3/GIO in water splitting reactions reached 1.62 mA/cm(2) at 1.5 V vs RHE, which is 1.4 times greater than that of optimized α-Fe2O3. The EIS and IPCE data confirm reduced electron-hole recombination and fast electron transfer processes due to the short distance between active materials and the conducting electrode in the α-Fe2O3/GIO system. Our result may pave the way for designing devices in advanced energy conversion applications as well as a high efficiency hematite-based PEC system.

Keywords: 3D graphene; hydrogen generation; photoelectrochemical cells (PEC); short hole diffusion length; water splitting

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