Journal
APPLIED PHYSICS EXPRESS
Volume 4, Issue 11, Pages -Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/APEX.4.117101
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CO2 reduction with water and light illumination is realized using a gallium nitride (GaN) photoelectrode in which excited electrons induce CO2 conversion at the counter electrode. For the counter electrode, a copper (Cu) plate was chosen. The low affinity and wide gap of the nitride semiconductor enable us to create an electron-hole pair which has a sufficient energy for both CO2 reduction and water oxidation, in spite of the fact that a high energy for CO2 reduction is required. Within this system, the generation of formic acid (HCOOH) with 3% Faradic efficiency was confirmed by light illumination alone. (C) 2011 The Japan Society of Applied Physics
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