TY - JOUR
T1 - Tailoring the hydrophilic and hydrophobic reaction fields of the electrode interface on single crystal Pt electrodes for hydrogen evolution/oxidation reactions
AU - Tanaka, Syunnosuke
AU - Takaya, Shohei
AU - Kumeda, Tomoaki
AU - Hoshi, Nagahiro
AU - Miyatake, Kenji
AU - Nakamura, Masashi
N1 - Funding Information:
This work was financially supported by the JSPS KAKENHI , Japan Grant Number 19H05048 and 18H05515 (Hydrogenomics) and the Toyota Mobility Foundation (TMF) . X-ray measurements were supported by JASRI/SPring−8 ( 2019A1246 and 2020A1274 ).
Publisher Copyright:
© 2021 Hydrogen Energy Publications LLC
PY - 2021/8/10
Y1 - 2021/8/10
N2 - Interfacial hydrophobic/hydrophilic reaction fields significantly affect various reactions at the electrode surface. The hydrogen evolution reaction (HER) and the hydrogen oxidation reaction (HOR) have been investigated on single crystal Pt electrodes modified with hydrophobic/hydrophilic cations and anion-exchange copolymers in alkaline solutions. In alkali metal hydroxide solutions, Pt (110) exhibits the highest HER/HOR activity in the low-index planes of Pt. On the low-index planes of Pt, the hydrophilicity of the alkali metal cation in the supporting electrolyte activates the HER/HOR depending on its hydration energy. Hydrophilic cations at the interface facilitate the extraction of hydrogen from the hydrated water. The modification of anion-exchange copolymers with a hydrophobic skeleton on Pt (110) further enhanced the HER/HOR activity. The hydrogen bonding network formed around the hydrophobic species facilitated the mobility of water molecules and the OH− as the reactant/product of the HER/HOR. Appropriately forming hydrophilic and hydrophobic reaction fields at the interface improved the HER/HOR activity.
AB - Interfacial hydrophobic/hydrophilic reaction fields significantly affect various reactions at the electrode surface. The hydrogen evolution reaction (HER) and the hydrogen oxidation reaction (HOR) have been investigated on single crystal Pt electrodes modified with hydrophobic/hydrophilic cations and anion-exchange copolymers in alkaline solutions. In alkali metal hydroxide solutions, Pt (110) exhibits the highest HER/HOR activity in the low-index planes of Pt. On the low-index planes of Pt, the hydrophilicity of the alkali metal cation in the supporting electrolyte activates the HER/HOR depending on its hydration energy. Hydrophilic cations at the interface facilitate the extraction of hydrogen from the hydrated water. The modification of anion-exchange copolymers with a hydrophobic skeleton on Pt (110) further enhanced the HER/HOR activity. The hydrogen bonding network formed around the hydrophobic species facilitated the mobility of water molecules and the OH− as the reactant/product of the HER/HOR. Appropriately forming hydrophilic and hydrophobic reaction fields at the interface improved the HER/HOR activity.
KW - Anion exchange copolymer
KW - Electrical double layer
KW - Hydrogen evolution/oxidation reaction
KW - Platinum
KW - Single crystal electrode
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U2 - 10.1016/j.ijhydene.2021.06.064
DO - 10.1016/j.ijhydene.2021.06.064
M3 - Article
AN - SCOPUS:85109079484
SN - 0360-3199
VL - 46
SP - 28078
EP - 28086
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 55
ER -
