Water Electrolysis in Saturated Phosphate Buffer at Neutral pH.,ChemSusChem

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Water Electrolysis in Saturated Phosphate Buffer at Neutral pH.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-09-01 , DOI: 10.1002/cssc.202001886
Takahiro Naito ₁ , Tatsuya Shinagawa ₁ , Takeshi Nishimoto ₁ , Kazuhiro Takanabe ₁

Affiliation

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 °C and 100 °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.

中文翻译：

中性 pH 值下饱和磷酸盐缓冲液中的水电解。

尽管目前的水电解装置在经济上无法与基于化石燃料的技术竞争，但利用可再生能源和无处不在的水生产氢气具有实现可持续性的潜力。在这里，我们评估了 pH 7 下的水电解，该电解比酸性和碱性 pH 值更温和，可能会克服这个问题。在不同温度和摩尔浓度下评估浓缩缓冲电解质的物理化学性质，以定量测定水电解过程中与质量传输相关的损失。随后，在 80 °C 和 100 °C 的饱和磷酸钾溶液中，发现最适合最大限度地减少中性 pH 值下质量传输引起的损失，IrO _x和 Pt 模型电极的水电解性能作为阳极和阴极分别与极端 pH 值相当。值得注意的是，这种浓缩缓冲溶液还实现了增强的稳定性，增加了这种电解液用于水电解的另一个优点。

更新日期：2020-09-01

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