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Bifunctional Electrocatalysts For Rechargeable Zinc-air Batteries Open Access

Descriptions

Other title
Subject/Keyword
Electrodeposition
Oxygen reduction reaction
Zinc-air battery
Electrocatalysts
Oxygen evolution reaction
Nanomaterials
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Elaheh, Davari
Supervisor and department
Ivey, Douglas G (Chemical and Materials Engineering)
Examining committee member and department
Etsell, Thomas H (Chemical and Materials Engineering)
Secanell, Marc (Mechanical Engineering)
Qi, Liu (Chemical and Materials Engineering)
Weixing, Chen (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Materials Engineering
Date accepted
2017-02-01T13:44:29Z
Graduation date
2017-06:Spring 2017
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
With the rapid development of electrified transportation, electrochemical energy storage devices will be more important than they have ever been in human history. Lithium-ion batteries are considered as the most energy efficient candidates, due to their relatively long cycle life. However, their limited energy density, as well as the safety issues, are concerns for their long-term application. As an attractive alternative, metal-air batteries have generated interest as promising large-scale electricity storage technologies. The light-weight architecture of metal-air batteries can provide high energy density with a simple and low cost cell design. Among various types of metal-air batteries, Zn-air batteries (ZABs) and Li-air batteries have been considered as the most promising metal-air batteries. Compared with Li, Zn is a more attractive metal due to its lower cost, abundance and environmentally friendliness. However, there are several technical issues associated with the structure of ZABs, including insufficient cycling durability, low charge-discharge activity and limited power density. One of the critical issues of rechargeable ZABs is the large overpotential associated with the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in the air cathode. Accordingly, developing novel bifunctional catalysts, which can enhance the kinetics of both OER and ORR, is one of the most critical factors to propel the ZABs to practical energy applications. Currently, the most effective bifunctional catalysts are based on precious metals (Pt-Ir based). However, the high cost and scarcity of precious metals limit their widespread use and remains a huge challenge for developing air cathodes. Therefore, it is important to develop inexpensive, stable and abundant non-precious metal catalysts in the design of ZABs. The purpose of this work is to design and synthesize novel non-precious metal catalysts among a wide range of materials using simple techniques. Non-precious metal materials are investigated in this thesis as potential ORR/OER catalysts, including Mn-Co mixed oxides, Mn-nitride, N-doped hollow mesoporous carbon and carbon coated N-doped Fe3O4.
Language
English
DOI
doi:10.7939/R3154F183
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Davari E, Ivey DG (2015) Mn-Co oxide/PEDOT as a bifunctional electrocatalyst for oxygen evolution/reduction reactions. MRS Proc 1777:1–6.Davari E, Johnson AD, Mittal A, et al (2016) Manganese-cobalt mixed oxide film as a bifunctional catalyst for rechargeable zinc-air batteries. Electrochim Acta. doi: 10.1016/j.electacta.2016.06.085Dalili N, Clark MP, Davari E, Ivey DG (2016) Microstructural characterization of the cycling behavior of electrodeposited manganese oxide supercapacitors using 3D electron tomography. J Power Sources 328:318–328. doi: 10.1016/j.jpowsour.2016.08.012Hadidi L, Davari E, Ivey D, Veinot J (2017) Microwave-assisted Synthesis and Prototype Oxygen Reduction Electrocatalyst Application of N-doped Carbon-Coated Fe3O4 Nanorods. Nanotechnology. doi: 10.1088/1361-6528/aa57161. Hadidi L, Davari E, Iqbal M, et al (2015) Spherical nitrogen-doped hollow mesoporous carbon as an efficient bifunctional electrocatalyst for Zn–air batteries. Nanoscale 7:20547–20556. doi: 10.1039/C5NR06028A

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