DGIST Scholar: A Non-precious Metal Oxide based Bi-functional Catalyst for Oxygen Reduction and Evolution Reactions in Alkaline medium

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Department of Energy Science and Engineering Theses Master

A Non-precious Metal Oxide based Bi-functional Catalyst for Oxygen Reduction and Evolution Reactions in Alkaline medium

Ahn, Tae Eun

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Title: A Non-precious Metal Oxide based Bi-functional Catalyst for Oxygen Reduction and Evolution Reactions in Alkaline medium

Alternative Title: 비금속 물질을 이용하여 효율적인 산소 환원 반응과 산소 생성 반응을 위한 촉매 연구

DGIST Authors: Ahn, Tae Eun ; Shanmugam, Sangaraju ; Kim, Soon Hyun

Advisor: Shanmugam, Sangaraju

Co-Advisor(s): Kim, Soon Hyun

Issued Date: 2014

Awarded Date: 2014. 2

Citation: Ahn, Tae Eun. (2014). A Non-precious Metal Oxide based Bi-functional Catalyst for Oxygen Reduction and Evolution Reactions in Alkaline medium. doi: 10.22677/thesis.2262548

Type: Thesis

Subject: Bi-functional catalyst ; Oxygen reduction reaction ; Oxygen evolution reaction ; Cobalt oxide ; 산화 /환원 촉매 ; 산소 환원 반응 ; 산소 산화 반응 ; 코발트 산화물

Abstract: 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
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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