Electrochemical cleaning of bare platinum electrodes

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Table of contents

Acknowledgements
Content
General Introduction
Chapter I: Introduction
I.1 Photosynthesis
I.2 Oxygen evolving complex (OEC)
I.3 Artificial photosynthesis
I.4 Water splitting
I.5 Oxygen evolution reaction (OER) catalyst
I.6 Manganese dioxides
I.7 Material preparation methods
I.8 Methods for OER evaluation
I.9 Motivation of this thesis
Chapter II: Experimental Methods
II.1 Introduction
II.2 Adopted chemicals
II.3 Preparation of MnO2 thin films
II.3.1 Substrates
II.3.2 Deposition electrolytes
II.3.3 Electrodeposition techniques
II.3.4 Post heat treatment
II.4 Characterization of structural, morphological and optical properties.
II.4.1 X-ray diffraction spectroscopy
II.4.2 Field emission gun scanning electron microscopy
II.4.3 Atomic force microscopy
II.4.4 Ultra-violet visible spectroscopy
II.4.5 X-ray photoelectron spectroscopy
II.5 Characterisation of electrochemical properties
II.5.1 Cyclic and linear sweep voltammetries
II.5.2 Chronoamperometry
II.5.3 Electrochemical impedance spectroscopy
II.6 Photoelectrochemical water splitting
Chapter III: Basic mechanism of electrodeposition of stable MnO2 thin films on different substrates
III.1 Introduction
III.2 Basic mechanism of water oxidation on a clean Pt electrode: preliminary checking experiments.
III.2.1 Electrochemical cleaning of bare platinum electrodes
III.2.2 Water oxidation on bare and clean platinum electrodes : influencing parameters
III.3 Electrodeposition of MnO2 films on Pt electrode
III.3.1 Electrodeposition and electrochemical reduction of MnO2 films
III.3.2 Influence of electrolyte pH on MnO2 electrodeposition
III.3.3 AFM images of MnO2 films electrodeposited on Pt electrode.
III.3.4 Optimisation of the electrodeposition conditions of MnO2 films on a Pt electrode
III.4 MnO2 electrodeposition on ITO
III.4.1 ITO electrode cleaning
III.4.2 Electrodeposition of MnO2 on ITO electrode
III.4.3 I-V curves of electrodeposited ITO/MnO2 films
III.4.4 Characterization of electrocatalytic activity of ITO/MnO2 films towards OER
III.5 MnO2 electrodeposition on FTO
III.5.1 FTO electrode cleaning
III.5.2 Electrodeposition of MnO2 films on FTO electrode
III.5.3 Nucleation and growth mechanism of MnO2 at different potentials
III.6 Comparison of glass/ITO and glass/FTO electrodes
III.7 MnO2 electrodeposition on a-CNx electrodes
III.8 Conclusion
Chapter IV: Heat treatment effect on the OER electrocatalysis of FTO/MnO2 electrodes .
IV.1 Introduction
IV.2 Effect of heating at low temperature
IV.2.1 On MnO2 films electrodeposited on FTO at 1.0 V vs. MSE
IV.2.2 On MnO2 films electrodeposited on FTO at 0.6 and 1.2 V vs. MSE
IV.3 Effect of heating at moderate temperature
IV.3.1 On MnO2 films electrodeposited on FTO at 0.6 V vs. MSE
IV.3.2 On MnO2 films electrodeposited on FTO at 1.2 V vs. MSE
IV.4 Effect of heating high temperature on FTO/MnO2 films
IV.5 Solar water splitting on heated FTO/MnO2 films
IV.6 Conclusions
Chapter V: Influence of cations insertion on the electrocatalytic activity of MnO2 films towards OER
V.1 Introduction
V.2 Preparation of FTO/C-MnO2 films containing different cations (C)
V.3 OER tests on electrodeposited FTO/C-MnO2 films
V.4 Structural and morphological analysis of electrodeposited FTO/C-MnO2 films
V.5 Element analysis of electrodeposited FTO/C-MnO2 films
V.6 Discussion
Conclusions
References
Appendix
A.1 Calibration of reference electrode
A.2 Calibration of solar simulator
Table list
Figure list