Catalyst-free hydrogen evolution of Si photocathode by thermovoltage-driven solar water splitting

Title
Catalyst-free hydrogen evolution of Si photocathode by thermovoltage-driven solar water splitting
Author
이정호
Keywords
Photoelectrochemical cell; Water splitting; Hydrogen; Thermovoltage; Hybrid device; PHOTO-CATHODES; EFFICIENCY; CELLS; ELECTRODES; REDUCTION; ENERGY
Issue Date
2015-04
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v. 279, Page. 151-156
Abstract
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/).
URI
http://www.sciencedirect.com/science/article/pii/S037877531500021Xhttp://hdl.handle.net/20.500.11754/35408
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2015.01.020
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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