电解液pH值的影响,碱金属阳离子(Na+,K+),并对多晶金电极界面水结构上O2的存在进行了详细的实验研究。通过激光感应电流瞬态(LICT)技术确定了最大熵(PME)的潜力。我们的结果表明,增加电解质pH值并引入O2会使PME移至更多的正电势。有趣的是,与Na相比,PME在K存在下对pH变化具有更高的敏感性。将K2SO4溶液的pH值从4改变到6可以引起PME的急剧变化。这些发现表明,例如,K2SO4和Na2SO4不能被认为是相等的支持电解质:这不是可行的假设。这可能外推到其他常见的“惰性”支持电解质。除此之外,关于接近理想的电解质组成的知识可用于优化电化学装置,如电解槽,燃料电池,电池,和超级电容器。
The influence of electrolyte pH, the presence of alkali metal cations (Na+ , K+ ), and the presence of O2 on the interfacial water structure of polycrystalline gold electrodes has been experimentally studied in detail. The potential of maximum entropy (PME) was determined by the laser-induced current transient (LICT) technique. Our results demonstrate that increasing the electrolyte pH and introducing O2 shift the PME to more positive potentials. Interestingly, the PME exhibits a higher sensitivity to the pH change in the presence of K+ than Na+ . Altering the pH of the K2 SO4 solution from 4 to 6 can cause a drastic shift in the PME. These findings reveal that, for example, K2 SO4 and Na2 SO4 cannot be considered as equal supporting electrolytes: it is not a viable assumption. This can likely be extrapolated to other common \"inert\" supporting electrolytes. Beyond this, knowledge about the near-ideal electrolyte composition can be used to optimize electrochemical devices such as electrolyzers, fuel cells, batteries, and supercapacitors.