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Table of contents
I. Introduction
I.1. The molten carbonate fuel cell.
I.2. Molten Carbonate Fuel Cell Optimization
I.2.1. Cathode optimization
I.2.2. Electrolyte optimization
I.3. The aim of this thesis
II. Materials and Methods
II.1. Atomic Layer Deposition (ALD)
II.2. As-deposited and after-test material characterization
II.3. Electrochemical methods
II.3.1. Electrochemical Impedance Spectroscopy (EIS)
II.3.2. Chronopotentiometry and Chronoamperometry
II.3.3. Modified cathodes and electrolyte
II.3.4. CO2 reduction in carbonate media
II.4. Ni solubility measurements
II.5. Single-cell set-up
III. ALD processed coatings for MCFC cathode protection
III.1. Metal oxides deposited by ALD
III.1.1. Deposition parameters
III.1.2. Characterization of as-deposited materials
III.1.3. After tests characterization
III.1.4. Electrochemical performance of protective coatings
III.1.5. Ni solubility
III.2. Conclusions
III.3. Scientific papers
IV. Electrolyte modification with Cs and Rb additives
IV.1. Theoretical approach
IV.1.1. Reaction-rate equations for oxygen reduction
IV.1.2. Nishina’s reaction order analysis.
IV.2. Oxygen and CO2 kinetics in Cs modified electrolyte
IV.2.1. Data analysis by Nishina’s diffusion cases
IV.2.2. The charge transfer resistance dependency on and
IV.3. Porous NiO behavior in Cs and Rb modified electrolytes
IV.4. Conclusions
IV.5. Scientific papers
V. CO2 Reduction: study by chronopotentiometry
V.1. The importance of CO2 reduction in molten carbonates
V.2. Synthesis of previous works by cyclic voltammetry
V.3. Chronopotentiometry on Gold and Graphite electrodes
V.3.1. Chronopotentiometric measurements
V.3.2. Current reversal chronopotentiometry (CRC)
V.3.3. Transition time analysis
V.4. Chronoamperometry
V.5. Conclusions
V.6. Scientific papers
VI. Single-cell tests in fuel cell mode
VI.1. General concepts
VI.1.1. MCFC operated with hydrogen and CO
VI.1.2. MCEC for CO2 reduction
VI.2. Cell assembly and operation
VI.2.1. The gas recovery flange concept and design modification
VI.2.2. Tape-cast of carbonate eutectic
VI.2.3. Calculating the carbonate/matrix ratio
VI.3. Electrochemical measurements on reference cell
VI.3.1. OCP
VI.3.2. I-E curves and fuel cell output power
VI.3.3. EIS
VI.4. Conclusions
General conclusions and prospects
Bibliography
