Influence of oxalate anions on manganese electrodeposition in sulfate solution |
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| Authors: | J R Xue H Zhong S Wang C X Li F F Wu |
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| Institution: | 1.College of Chemistry and Chemical Engineering,Central South University,Changsha,China;2.College of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan,China |
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| Abstract: | The influences of oxalate anions on manganese electrodeposition in sulfate solution were investigated on the basis of cathode current efficiency, characterization of SEM-EDX and XRD, solution chemistry calculation, thermodynamics and electrochemical test. The experimental results show that the range of (NH4)2C2O4 was adjusted from 0 mol/L to 4.8?×?10?3 mol/L. And 1.5?×?10?3 mol/L (NH4) 2C2O4 was suitably used with initial pH 7.0. The characterization of SEM indicates that oxalate anions can improve the morphology of electrodeposited films. The electrodeposited films containing manganese were characterized and determined by EDX and XRD. The solution chemistry calculation of catholyte and oxalate anions shows that the main active species are MnSO4, Mn(SO4)2? 2, Mn2+, Mn(SO4)C2O2? 4, MnC2O 4, Mn(NH3)2+, and C2O2? 4. The reaction trend between C2O2? 4 and Mn2+ ions is confirmed by computation of reaction energy. Electrochemical test analysis indicates oxalate anions increase the overpotentials of hydrogen evolution reaction and manganese electrodeposition. |
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