이정호
2018-02-05T05:25:34Z
2018-02-05T05:25:34Z
2015-04
JOURNAL OF POWER SOURCES, v. 279, Page. 151-156
0378-7753
1873-2755
http://www.sciencedirect.com/science/article/pii/S037877531500021X
http://hdl.handle.net/20.500.11754/35408
An externally biased overpotential is normally required for photoelectrochemically cleaving water molecules. Moreover, very few semiconductors exhibit the necessary performance for the efficient transfer of photon energy to the binding electrons of water molecules unless a suitable catalyst is present. Here, we present a catalyst-free photoelectrochemical (PEC) cell electrically coupled in series with a thermoelectric device, which is capable of utilizing the full solar spectrum by synergistically collecting photon and phonon energies. Thermodynamic overpotentials originally required for the PEC reaction were spontaneously offset by the thermovoltage, which adjusts the Fermi level of a counter-electrode. Using a catalyst-free Si photocathode of unbiased conditions, we achieved a photon-to-current efficiency of similar to 20% at an 56 degrees C temperature gradient by harnessing only solar energy. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.orgilicenses/by-nc-nd/4.0/).
This research was supported by the Pioneer Research Center Program (No. 2009-0083007) and the grant (No. 2011-0028604) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning. This work was also supported by the New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant (No. 20123010010160) funded by the Korea government Ministry of Trade, Industry and Energy.
en_US
ELSEVIER SCIENCE BV
Photoelectrochemical cell
Water splitting
Hydrogen
Thermovoltage
Hybrid device
PHOTO-CATHODES
EFFICIENCY
CELLS
ELECTRODES
REDUCTION
ENERGY
Catalyst-free hydrogen evolution of Si photocathode by thermovoltage-driven solar water splitting
Article
279
10.1016/j.jpowsour.2015.01.020
151-156
JOURNAL OF POWER SOURCES
Shin, SM
Jung, JY
Park, MJ
Song, JW
Lee, JH
2015001360
E
COLLEGE OF ENGINEERING SCIENCES[E]
DEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING
jungho