Influence of surface oxygen groups on V(II) oxidation reaction kinetics |
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| Institution: | 1. Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;2. Laboratory of Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland;1. School of Biotechnology, Dublin City University, Collins Avenue, Dublin, Ireland;2. School of Physical Sciences and National Centre for Plasma Science and Technology, Dublin City University, Collins Avenue, Dublin, Ireland;3. National Centre for Sensor Research, Dublin City University, Collins Avenue, Dublin, Ireland;4. Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, 60 Nanyang Drive, SBS-01N-27, Singapore, 637551;1. Department of Chemistry, College of Science, Honghe University, Mengzi, 661199, Yunnan, China.;2. Local Characteristic Resource Utilization and New Materials Key Laboratory of Universities in Yunnan, Honghe University, Mengzi 661199, Yunnan, China. |
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| Abstract: | The role of surface oxygen groups on the kinetics of the V(II) oxidation reaction was studied on modified glassy carbon (GC) electrodes by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The reaction was found to be sensitive to the presence of oxygen groups on the electrode surface. Higher O/C ratios determined by X-ray photoelectron spectroscopy (XPS) corresponded to higher reactivities and lower charge transfer resistances measured in a 1 M V(II) electrolyte. The stability of an oxidised GC surface was also investigated in a 1 M V(II) electrolyte by potential holding and cycling experiments. It was found that after holding and cycling to successively more negative potentials up to − 0.8 V/RHE, the electrode surface lost its initial reactivity. |
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