Effects of pH and Anion on Hydrogen Sorption/Desorption at/within Oxide‐Derived Pd Electrodes
Effects of pH and Anion on Hydrogen Sorption/Desorption at/within Oxide‐Derived Pd Electrodes
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DOI：
10.1149/1.2048585
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发表时间：
1995-05
影响因子：
3.9
通讯作者：
Chi-Chang Hu;T. Wen
中科院分区：
文献类型：
--
作者：
Chi-Chang Hu;T. Wen
A lot of interest in the electrochemical behavior of H and D sorption within/at palladium has been prompted by Fleischmann and Pons` reports which had claimed to observe that nuclear fusion was induced by electrochemical compression of deuterium within a palladium lattice, although there are some disputes of this work in the open literature. 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{sup 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 H{sub 2}PO{sub 4}{sup {minus}}/HPO{sub 4}{sup 2{minus}}. The sequence of anions with respect to increasing ability to inhibit hydrogen sorption is: CH{sub 3}COO{sup {minus}} < Cl{sup {minus}} < HSO{sub 4}{sup {minus}} {approx_equal} ClO{sub 4} < HC{sub 2}O{sub 4}
