TY - JOUR
T1 - Effects of operating conditions on performance of high-temperature polymer electrolyte water electrolyzer
AU - Li, Hua
AU - Inada, Akiko
AU - Fujigaya, Tsuyohiko
AU - Nakajima, Hironori
AU - Sasaki, Kazunari
AU - Ito, Kohei
N1 - Funding Information:
This study was supported by Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST) .
Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.
PY - 2016/6/30
Y1 - 2016/6/30
N2 - Effects of operating conditions of a high-temperature polymer electrolyte water electrolyzer (HT-PEWE) on the electrolysis voltage are evaluated, and the optimal conditions for a high performance are revealed. A HT-PEWE unit cell with a 4-cm2 electrode consisting of Nafion117-based catalyst-coated membrane with IrO2 and Pt/C as the oxygen and hydrogen evolution catalysts is fabricated, and its electrolysis voltage and high-frequency resistance are assessed. The cell temperature and pressure are controlled at 80-130 °C and 0.1-0.5 MPa, respectively. It is observed that increasing the temperature at a constant pressure of 0.1 MPa does not increase the ohmic overvoltage of the cell; however, it does increase the concentration overvoltage. It is also found that the increase in the overvoltage resulting from the rise in the temperature can be suppressed by elevating the pressure. When operating the cell at a temperature of 100 °C, pressure greater than 0.1 MPa suppresses the overvoltage, and so does pressures greater than 0.3 MPa at 130 °C. This behavior suggests that keeping the water in a liquid water phase by increasing the pressure is critical for operating PEWEs at high temperatures.
AB - Effects of operating conditions of a high-temperature polymer electrolyte water electrolyzer (HT-PEWE) on the electrolysis voltage are evaluated, and the optimal conditions for a high performance are revealed. A HT-PEWE unit cell with a 4-cm2 electrode consisting of Nafion117-based catalyst-coated membrane with IrO2 and Pt/C as the oxygen and hydrogen evolution catalysts is fabricated, and its electrolysis voltage and high-frequency resistance are assessed. The cell temperature and pressure are controlled at 80-130 °C and 0.1-0.5 MPa, respectively. It is observed that increasing the temperature at a constant pressure of 0.1 MPa does not increase the ohmic overvoltage of the cell; however, it does increase the concentration overvoltage. It is also found that the increase in the overvoltage resulting from the rise in the temperature can be suppressed by elevating the pressure. When operating the cell at a temperature of 100 °C, pressure greater than 0.1 MPa suppresses the overvoltage, and so does pressures greater than 0.3 MPa at 130 °C. This behavior suggests that keeping the water in a liquid water phase by increasing the pressure is critical for operating PEWEs at high temperatures.
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U2 - 10.1016/j.jpowsour.2016.03.108
DO - 10.1016/j.jpowsour.2016.03.108
M3 - Article
AN - SCOPUS:84962905508
VL - 318
SP - 192
EP - 199
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -
