TY - JOUR
T1 - Overvoltage reduction in membrane Bunsen reaction for hydrogen production by using a radiation-grafted cation exchange membrane and porous Au anode
AU - Sawada, Shin ichi
AU - Kimura, Takehiro
AU - Nishijima, Haruyuki
AU - Kodaira, Takehide
AU - Tanaka, Nobuyuki
AU - Kubo, Shinji
AU - Imabayashi, Shin ichiro
AU - Nomura, Mikihiro
AU - Yamaki, Tetsuya
N1 - Funding Information:
This work was partially supported by the Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program ( SIP ), “energy carrier” (Funding agency: JST ).
Publisher Copyright:
© 2020 Hydrogen Energy Publications LLC
PY - 2020/5/18
Y1 - 2020/5/18
N2 - An electrochemical membrane Bunsen reaction using a cation exchange membrane (CEM) is a key to achieving iodine-sulfur (IS) thermochemical water splitting for the mass-production of hydrogen. In this study, we prepared a radiation-grafted CEM with a high ion exchange capacity (IEC) and a highly-porous Au-electroplated anode, and then used them for the membrane Bunsen reaction to reduce cell overvoltage. The high ionic content of our CEM led to low resistivity for proton transport, while the high porosity of the electrode led to a large effective surface area for anodic SO2 oxidation. The cell overvoltage for the membrane Bunsen reaction was significantly reduced to 0.21 V at 200 mA/cm2, one-third of that achieved using a commercial CEM and non-porous anode. From the analysis of the current-voltage characteristics, the grafted CEM was demonstrated to play a dominant role in the overvoltage reduction compared to the porous Au anode.
AB - An electrochemical membrane Bunsen reaction using a cation exchange membrane (CEM) is a key to achieving iodine-sulfur (IS) thermochemical water splitting for the mass-production of hydrogen. In this study, we prepared a radiation-grafted CEM with a high ion exchange capacity (IEC) and a highly-porous Au-electroplated anode, and then used them for the membrane Bunsen reaction to reduce cell overvoltage. The high ionic content of our CEM led to low resistivity for proton transport, while the high porosity of the electrode led to a large effective surface area for anodic SO2 oxidation. The cell overvoltage for the membrane Bunsen reaction was significantly reduced to 0.21 V at 200 mA/cm2, one-third of that achieved using a commercial CEM and non-porous anode. From the analysis of the current-voltage characteristics, the grafted CEM was demonstrated to play a dominant role in the overvoltage reduction compared to the porous Au anode.
KW - Cation exchange membrane
KW - Cell overvoltage
KW - Membrane Bunsen reaction
KW - Porous anode electrode
KW - Radiation grafting
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U2 - 10.1016/j.ijhydene.2020.02.229
DO - 10.1016/j.ijhydene.2020.02.229
M3 - Article
AN - SCOPUS:85083336307
VL - 45
SP - 13814
EP - 13820
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 27
ER -