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Journal of the Electrochemical Society, Vol.163, No.7, H499-H507, 2016
Component-Controlled Synthesis of Gradient Electrode for Efficient Electrocatalytic Dye Decolorization
We present the multi-pulse electrodeposition fabrication of gradient Pd-Sb-SnO2 on Ti substrate to improve the electrocatalytic performance of electrodes. Scanning electron microscopy (SEM) results show that pulse-deposited electrodes possess the morphology of flower-like clusters. The discussion for growth mechanism demonstrates that the production of flower-like cluster is related to the diffusion limitation. The difference between traditionally electrodeposited electrode and pulse electrodeposited electrode was investigated and demonstrated that pulse deposited electrode possesses a higher Sb5+/Sb3+ ratio and higher O-ads/O-lat ratio. The electrochemical characterization shows that pulse deposited electrode has a significantly enhanced activity (98.57 ohm versus 362.7 ohm for electrochemical impedance). Moreover, the electrocatalytic dye decolorization experiments show that the morphology of flower-like clusters and the component gradient on pulse deposited electrode can provide more active specific surface area and advance the dye decolorization process (first-order kinetics constants: 24.2 x 10(-3) versus 9.19 x 10(-3) min(-1) for methylene blue, 39.7 x 10(-3) versus 24.3 x 10(-3) min(-1) for orange II and 51.7 x 10(-3) versus 24.2 x 10(-3) min(-1) for methyl orange, respectively). These results demonstrate that the pulse electrodeposited electrode possesses more efficient catalytic activity. At last, we expect that the approach for electrode preparation can provide a chance to develop the methodology of component/morphology-controlled synthesis. (C) 2016 The Electrochemical Society. All rights reserved.