Cover Feature: Water Electrolysis in Saturated Phosphate Buffer at Neutral pH (ChemSusChem 22/2020)
Cover Feature: Water Electrolysis in Saturated Phosphate Buffer at Neutral pH (ChemSusChem 22/2020)
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封面专题：中性 pH 值下饱和磷酸盐缓冲液中的水电解 (ChemSusChem 22/2020)
DOI：
10.1002/cssc.202002330
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发表时间：
2020
期刊：
影响因子：
8.4
通讯作者：
Takanabe Kazuhiro
中科院分区：
文献类型：
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作者：
Naito Takahiro;Shinagawa Tatsuya;Nishimoto Takeshi;Takanabe Kazuhiro
从可再生能源和无处不在的水制氢具有实现可持续性的潜力，尽管目前的水电解槽无法与基于化石燃料的技术在经济上竞争。在这里，我们评估在pH 7下的水电解，其比酸性和碱性pH对应物温和，并且可以克服这个问题。 在不同温度和质量摩尔浓度下评估浓缩缓冲电解质的物理化学性质，以定量测定水电解期间与传质相关的损失。随后，在80 °C和100 °C下的饱和磷酸钾溶液中，发现其对于最小化源自中性pH下的传质的损失是最佳的，分别作为阳极和阴极的IrOx和Pt的模型电极上的水电解性能与极端pH下的那些相当。值得注意的是，这种浓缩的缓冲溶液还实现了增强的稳定性，增加了该电解质用于水电解的另一优点。
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 IrOxand 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.