EFFECTS OF PH AND ANION ON HYDROGEN SORPTION-DESORPTION AT WITHIN OXIDE-DERIVED PD ELECTRODES

被引：23

作者：

HU, CC

WEN, TC

机构：

[1] Department of Chemical Engineering, National Cheng Kung University, Tainan

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1995年 / 142卷 / 05期

关键词：

D O I：

10.1149/1.2048585

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Oxide-derived Pd electrodes were obtained by cathodic polarization of Pd oxide-coated titanium electrodes (fabricated by thermal decomposition) at 0 V (RHE) for 30 min in 1.5 mol dm(-3) NaOH. Hydrogen adsorption/absorption (denoted hereafter as sorption) and desorption within/at these electrodes were obtained using cyclic voltammetry (CV), chronopotentiometry, and linear sweep voltammetry (LSV). CV results revealed that beta-PdH formation/oxidation is more reversible in either concentrated acid or base solutions than in intermediate pH media and the rate of beta-PdH desorption is faster in a pH solution <10. The oxidation of beta-PdH is electron transfer controlled in intermediate pH media, especially in weakly basic solutions due to the adsorption of H2PO4-/HPO42-. The sequence of anions with respect to increasing ability to inhibit hydrogen sorption is: CH3COO- < Cl- < HSO4- similar or equal to ClO4- < HC2O4- < H2PO4-.

引用

页码：1376 / 1383

页数：8

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