Finite fossil fuels and destroyed nature make us to rely on develop renewable energy resources. One of the promising energy systems is metal-air battery which meets drawbacks of traditional metal-ion battery. The redox reaction of metal and oxygen (O2) in air generates electrical energy. A key issue of metal-air battery is to improve the efficiency of cathode that occur redox reaction of O2 such as oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). ⓒ 2014 DGIST
Table Of Contents
Ⅰ. INTRODUCTION 1-- 1.1. Foreword 1-- 1.2. Characteristics of metal-air batteries 2-- 1.2.1. Advantages & disadvantages of metal-air batteries 2-- 1.2.2. Basic principles of metal-air batteries 4-- 1.3. Studies of bi-functional catalysts 8-- 1.3.1. Various types of bi-functional catalysts 8-- 1.3.2. ORR & OER studies 10-- 1.4. Theoretical background 14-- 1.4.1. Concept of doping 14-- 1.4.2. Characteristic of materials 15-- 1.5. Objectives of work 16-- Ⅱ. EXPERIMENTAL 18-- 2.1. Chemicals 18-- 2.2. Synthesis of Graphene oxide (GO) 18-- 2.3. Synthesis of catalysts 19-- 2.3.1. Preparation of cobalt oxide/GO 19-- 2.3.2. Preparation of manganese doped cobalt oxide/GO 19-- 2.3.3. Preparation of nitrogen doped cobalt oxide/GO 19-- 2.3.4. Preparation of cobalt hydroxide/GO 20-- 2.4. Characterizations 20-- 2.4.1. Morphological analysis 20-- 2.4.2. Elemental characterization 21-- 2.4.3. Electrochemical studies 21-- Ⅲ. RESULTS $ DISCUSSIONS RESULTS 22-- PART 1: Studies of of catalysts with different doping 22-- 3.1. Morphology studies of catalysts 22-- 3.2. Structural studies of catalysts 22-- 3.3. Chemical and electronic properties of catalysts 25-- 3.4. Electrochemical activities of catalysts 27-- 3.4.1. Oxygen reduction reaction activities 27-- 3.4.2. Oxygen evolution reaction activities 31-- 3.4.3. Evaluation for bi-functional catalyst 32-- PART 2: Studies of OER mechanism 33-- 3.5. Comparison of catalysts morphologies 33-- 3.6. Comparison of catalyst structure 33-- 3.7. Comparison of chemical and electronic properties 37-- 3.8. Electrochemical studies 39-- 3.8.1. Oxygen reduction reaction activities 39-- 3.8.2. Oxygen evolution reaction activities 41-- Ⅳ. CONCLUSIONS 45-- REFERENCE 46
Research Interests
Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization