论文标题
磷酸物种对Ag（111）和Ag（100）电极的特异性吸附及其在氢进化反应低电势下的影响
Specific adsorption of phosphate species on Ag (111) and Ag (100) electrodes and their effect at low overpotentials of the hydrogen evolution reaction
论文作者
论文摘要
Investigation of phosphate species adsorption/desorption processes was performed on Ag(100) and Ag(111) electrodes in H$_{3}$PO$_{4}$, KH$_{2}$PO$_{4}$ and K$_{3}$PO$_{4}$ solutions by Current-Potential ($j-V$) profiles and电化学阻抗光谱（$ eis $）。我们使用等效电路方法符合阻抗光谱。根据所分析的潜在区域，采用了不同的电流电路（$ eecs $）。对于比氢进化反应（$ $ $）发作的潜力更负面，包括与$（rc）$分支并行的电荷转移电阻（r $ _ {ct} $）。 $ J-V $配置文件的高峰已集成以估计表面覆盖范围。观察到AG（HKL）/kh $ _ {2} $ po $ _ {4} $ Systems的可逆过程，其中获得了0.07 ml的值。 For Ag(111)/H$_{3}$PO$_{4}$, a coverage of about 0.024 ML was calculated from anodic/cathodic $j-V$ profiles, whereas for Ag(hkl)/K$_{3}$PO$_{4}$ systems different values were obtained from integration of anodic/cathodic peaks due to highly irreversible processes were观察到。对于AG（HKL）/K $ _ {3} $ PO $ _ {4} $，电容（C $ _ {（ϕ）} $）图在两个面上与众不同，并且从电阻参数中评估了OH $^{ - } $的共同吸附。每个电极都能获得特定面部特异性的松弛时间。此外，发现她的Ag $ $ $（111）在pH = 1.60时的发作潜力比AG（100）的负面值约为100 mV。
Investigation of phosphate species adsorption/desorption processes was performed on Ag(100) and Ag(111) electrodes in H$_{3}$PO$_{4}$, KH$_{2}$PO$_{4}$ and K$_{3}$PO$_{4}$ solutions by Current-Potential ($j-V$) profiles and Electrochemical Impedance Spectroscopy ($EIS$). We used the equivalent circuit method to fit the impedance spectra. Different electrical equivalent circuits ($EECs$) were employed depending on the potential region that was analyzed. For potentials more negative than the onset of the hydrogen evolution reaction ($her$), a charge transfer resistance (R$_{ct}$) in parallel to the $(RC)$ branches was included. Peaks from $j-V$ profiles were integrated to estimate surface coverage. A reversible process was observed for Ag(hkl)/KH$_{2}$PO$_{4}$ systems, where a value of 0.07 ML was obtained. For Ag(111)/H$_{3}$PO$_{4}$, a coverage of about 0.024 ML was calculated from anodic/cathodic $j-V$ profiles, whereas for Ag(hkl)/K$_{3}$PO$_{4}$ systems different values were obtained from integration of anodic/cathodic peaks due to highly irreversible processes were observed. In the case of Ag(hkl)/K$_{3}$PO$_{4}$, the capacitance (C$_{(ϕ)}$) plots are well differentiated for the two faces, and co-adsorption of OH$^{-}$ was evaluated from resistance parameters. Characteristic face-specific relaxation times are obtained for each electrode. In addition, it was found that the onset potential of $her$ for Ag(111) at pH=1.60 was about 100 mV more negative compare to Ag(100).
