电解质
电化学
阴极
化学
电解
电解水
缓冲溶液
电极
扩散
化学工程
缓冲器(光纤)
无机化学
氢
分析化学(期刊)
热力学
色谱法
物理化学
工程类
物理
有机化学
电信
计算机科学
作者
Jiazhe Wu,Wenyu Zheng,Yubin Chen
标识
DOI:10.1016/j.ijhydene.2022.04.035
摘要
Water reduction reaction to produce hydrogen has been extensively studied in electrochemical and photoelectrochemical water splitting. The cathode/electrolyte interfacial pH change (ΔpH) during water reduction has a non-negligible impact on the activity and stability. However, there are difficulties in experimentally detecting pH change of the localized solution close to the electrode. Herein, a one-dimensional finite element numerical computational model is proposed to simulate the water reduction process. Potential, bulk pH, temperature, and buffer species are considered as variable factors to investigate their effects on interfacial pH change. The interfacial ΔpH could decrease to a large extent as the bulk pH increases. The ΔpH in the whole diffusion layer would decrease when buffer species is introduced. Whereas, the impact of temperature is less significant. According to the simulation results, raising the bulk pH and introducing buffer species can keep the interfacial pH change within 1 unit, which is an efficient route to stabilize water electrolysis. • A numerical model to detect the electrode/electrolyte pH change is proposed. • The coupled effects of influencing factors on the interfacial pH change are examined. • Raising bulk pH and adding buffer species are effective to inhibit the pH change.
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