TY - JOUR
T1 - Thermodynamic analysis of a photoelectrochemical hydrogen production system
AU - Tseng, Chia Lin
AU - Tseng, Chung Jen
AU - Chen, Jyh Chen
PY - 2010/4
Y1 - 2010/4
N2 - The thermodynamic analysis of photoelectrochemical (PEC) hydrogen production is performed in this work for air mass 1.5 solar insolation. Because the energy required for splitting water decreases as temperature is increased, heating the system by using the long wavelength energy will increase the system efficiency. As the energy band gap of the photoelectrode increases, the induced photo-current is decreased. If photons absorbed are all excited, the maximum photo-current is 63.8 mA/cm2. For TiO2 (∼3.2 eV) and Fe2O3 (∼2.1 eV), the maximum photo-current is respectively 0.68 mA/cm2 and 10.4 mA/cm2. The maximum power conversion efficiency of a PEC cell is 44.1%. For TiO2 and Fe2O3, the power conversion efficiency is 2.8% and 21.9%, respectively. At 647 K and quantum efficiency = 30%, the maximum hydrogen production rate is 7.5 L/m2 h and 41.8 L/m2 h for TiO2 and Fe2O3, and the maximum efficiency of solar to hydrogen is 2.71% and 14.2% for TiO2 and Fe2O3 respectively. In order to increase the maximum hydrogen production rate, it is more effective to raise the quantum efficiency than raising the reaction temperature.
AB - The thermodynamic analysis of photoelectrochemical (PEC) hydrogen production is performed in this work for air mass 1.5 solar insolation. Because the energy required for splitting water decreases as temperature is increased, heating the system by using the long wavelength energy will increase the system efficiency. As the energy band gap of the photoelectrode increases, the induced photo-current is decreased. If photons absorbed are all excited, the maximum photo-current is 63.8 mA/cm2. For TiO2 (∼3.2 eV) and Fe2O3 (∼2.1 eV), the maximum photo-current is respectively 0.68 mA/cm2 and 10.4 mA/cm2. The maximum power conversion efficiency of a PEC cell is 44.1%. For TiO2 and Fe2O3, the power conversion efficiency is 2.8% and 21.9%, respectively. At 647 K and quantum efficiency = 30%, the maximum hydrogen production rate is 7.5 L/m2 h and 41.8 L/m2 h for TiO2 and Fe2O3, and the maximum efficiency of solar to hydrogen is 2.71% and 14.2% for TiO2 and Fe2O3 respectively. In order to increase the maximum hydrogen production rate, it is more effective to raise the quantum efficiency than raising the reaction temperature.
KW - Efficiency
KW - Hydrogen production
KW - Photoelectrochemical method
UR - http://www.scopus.com/inward/record.url?scp=77951024016&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2009.05.017
DO - 10.1016/j.ijhydene.2009.05.017
M3 - 期刊論文
AN - SCOPUS:77951024016
SN - 0360-3199
VL - 35
SP - 2781
EP - 2785
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 7
ER -
