酸性溶液中铼的电沉积行为

Electrodeposition of rhenium from acidic solution

采用电化学循环伏安法、恒电位沉积法和电化学石英微晶天平(EQCM)研究铼在酸性溶液中的电沉积行为。结果表明:当溶液接近中性(pH=6)时,金属铼难以被还原出来;当溶液酸度较低(pH=3)时,电沉积产物含有铼的氧化物(ReO_(3));当溶液酸度较高时(pH=1),电沉积产物为金属铼,所得产物的微观形貌中存在明显的裂纹;且随着溶液中ReO_(4)^(-)浓度的增加,铼的电沉积得到促进。在1.0 mmol/L ReO_(4)^(-)(pH=1)溶液中铼的沉积电位为−0.68 V。通过恒电位沉积得出不同条件下的电解效率,最高可达5.62%。

The electrodeposition of rhenium from acidic solution was studied by cyclic voltammetry,potentiostatic electrodeposition and electrochemical quartz microcrystal balance(EQCM).The results show that metal rhenium is difficult to be reduced from near neutral solutions(pH=6);the electrodeposition product contains rhenium oxide(ReO_(3))from solutions with low acidity(pH=3);In solutions with high acidity(pH=1),the electrodeposition product is metallic rhenium,increasing the concentration of ReO_(4)^(-)can promote the electrodeposition of rhenium,while there are obvious cracks in the morphology of metal rhenium.The electrodeposition potential of rhenium is determined to be−0.68 V in solutions containing 1.0 mmol/L ReO_(4)^(-)(pH=1).Current efficiency for different conditions is up to 5.62%,obtained by potentiostatic electrodeposition.