Journal
CHEMSUSCHEM
Volume 15, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202102294
Keywords
electrocatalysis; electrochemistry; gas-separator; near-neutral pH; water electrolysis
Funding
- Asahi Kasei Corporation, UTokyo-KAUST collaborative research OSR [4191]
- JSPS KAKENHI [19K23569]
- Mohammed bin Salman Center for Future Science and Technology [MbSC2030]
- Grants-in-Aid for Scientific Research [19K23569] Funding Source: KAKEN
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This study demonstrates that electrolyte engineering and the use of a glass sheet as a gas separator can reduce gas crossover and bubble permeation in near-neutral pH water electrolysis, leading to higher purity of hydrogen production.
Near-neutral pH water electrolysis driven by renewable electricity can reduce the costs of clean hydrogen generation, but its low efficiency and gas crossover in industrially relevant conditions remain a challenge. Here, it was shown that electrolyte engineering could suppress the crossover of dissolved gases such as O-2 by regulating their diffusion flux. In addition, a hydrophilized mechanically stable glass sheet was found to block the permeation of gas bubbles, further enhancing the purity of evolved gas from water electrolysis. This sheet had a lower resistance than conventional diaphragms such as Zirfon due to its high porosity and small thickness. A saturated K-phosphate solution at pH 7.2 was used as an electrolyte together with the hydrophilized glass sheet as a gas-separator. This led to a near-neutral pH water electrolysis with 100 mA cm(-2) at a total cell voltage of 1.56 V with 99.9 % purity of produced H-2.
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