Journal
CHEMSUSCHEM
Volume 13, Issue 22, Pages 5921-5933Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202001886
Keywords
electrocatalysis; energy conversion; heterogeneous catalysis; phosphate solutions; water electrolysis
Funding
- JSPS KAKENHI [19K23569]
- UTokyo-KAUST collaborative research OSR [4191]
- Grants-in-Aid for Scientific Research [19K23569] Funding Source: KAKEN
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Hydrogen production from renewable energy and ubiquitous water has a potential to achieve sustainability, although current water electrolyzers cannot compete economically with the fossil fuel-based technology. Here, we evaluate water electrolysis at pH 7 that is milder than acidic and alkaline pH counterparts and may overcome this issue. The physicochemical properties of concentrated buffer electrolytes were assessed at various temperatures and molalities for quantitative determination of losses associated with mass-transport during the water electrolysis. Subsequently, in saturated K-phosphate solutions at 80 degrees C and 100 degrees C that were found to be optimal to minimize the losses originating from mass-transport at the neutral pH, the water electrolysis performance over model electrodes of IrO(x)and Pt as an anode and a cathode, respectively, was reasonably comparable with those of the extreme pH. Remarkably, this concentrated buffer solution also achieved enhanced stability, adding another merit of this electrolyte for water electrolysis.
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