Unassisted photoelectrochemical water splitting exceeding 7% solar-to-hydrogen conversion efficiency using photon recycling

Xinjian Shi, Hokyeong Jeong, Seung Jae Oh, Ming Ma, Kan Zhang, Jeong Kwon, In Taek Choi, Il Yong Choi, Hwan Kyu Kim, Jong Kyu Kim () and Jong Hyeok Park ()
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Xinjian Shi: Yonsei University
Hokyeong Jeong: Pohang University of Science and Technology
Seung Jae Oh: Pohang University of Science and Technology
Ming Ma: School of Chemical Engineering and SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University
Kan Zhang: Yonsei University
Jeong Kwon: School of Chemical Engineering and SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University
In Taek Choi: Global GET-Future Lab, Korea University
Il Yong Choi: Pohang University of Science and Technology
Hwan Kyu Kim: Global GET-Future Lab, Korea University
Jong Kyu Kim: Pohang University of Science and Technology
Jong Hyeok Park: Yonsei University

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Various tandem cell configurations have been reported for highly efficient and spontaneous hydrogen production from photoelectrochemical solar water splitting. However, there is a contradiction between two main requirements of a front photoelectrode in a tandem cell configuration, namely, high transparency and high photocurrent density. Here we demonstrate a simple yet highly effective method to overcome this contradiction by incorporating a hybrid conductive distributed Bragg reflector on the back side of the transparent conducting substrate for the front photoelectrochemical electrode, which functions as both an optical filter and a conductive counter-electrode of the rear dye-sensitized solar cell. The hybrid conductive distributed Bragg reflectors were designed to be transparent to the long-wavelength part of the incident solar spectrum (λ>500 nm) for the rear solar cell, while reflecting the short-wavelength photons (λ

Date: 2016
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DOI: 10.1038/ncomms11943

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