Wang Ying, Qu Jiuhui
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Beijing, China.
Water Environ Res. 2006 Jul;78(7):724-9. doi: 10.2175/106143006x110665.
A highly active electrocatalytic electrode for nitrate reduction was prepared by the electro-deposition of palladium onto a copper electrode. The capacity of nitrate reduction by a palladium-modified copper electrode has been studied using cyclic voltammetry (CV). The existence of a reduction peak at -0.605 V versus saturated calomel electrode in 0.1-M sodium nitrate + 0.1-M perchloric acid solution (pH = 0.86) can be found in the CV measurement. The influence of solution properties, such as pH, nitrate concentration, and other anions in solution, on nitrate reduction was determined in detail. Results showed that nitrate reduction was suppressed in alkaline solution, while it was beneficial to nitrate reduction in acid or neutral solution. At low nitrate concentrations (0.01 to 0.5 M), nitrate reduction current increased with increasing nitrate concentration, but was hindered by sulfate. At high nitrate concentrations (1 to 5 M), no significant difference on nitrate reduction was observed. Compared with other different electrodes prepared in our work (copper, titanium, and palladium-modified titanium electrodes), the palladium-modified copper electrode showed the highest electrocatalytic capacity and stability in the nitrate-reduction process.
通过将钯电沉积到铜电极上制备了一种用于硝酸盐还原的高活性电催化电极。使用循环伏安法（CV）研究了钯修饰铜电极对硝酸盐还原的能力。在0.1 M硝酸钠+0.1 M高氯酸溶液（pH = 0.86）中，相对于饱和甘汞电极，在-0.605 V处存在还原峰，这在CV测量中可以发现。详细确定了溶液性质，如pH、硝酸盐浓度和溶液中的其他阴离子对硝酸盐还原的影响。结果表明，在碱性溶液中硝酸盐还原受到抑制，而在酸性或中性溶液中则有利于硝酸盐还原。在低硝酸盐浓度（0.01至0.5 M）下，硝酸盐还原电流随硝酸盐浓度的增加而增加，但受到硫酸盐的阻碍。在高硝酸盐浓度（1至5 M）下，未观察到硝酸盐还原有显著差异。与我们工作中制备的其他不同电极（铜、钛和钯修饰钛电极）相比，钯修饰铜电极在硝酸盐还原过程中表现出最高的电催化能力和稳定性。
