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Dr. Joonho Bae

Joonho Bae, Department of Nano-physics, Gachon University, Korea

  

Talk Title
Novel ZnO nanocones and multi-dimensional nanocarbons: preparations and applications in energy and optical devices

Talk Abstract
 

In this talk, we present interesting nano-engineered materials, ZnO nanocones (NCs) and multidimensional carbon nanostructures and their recent progress made in our group. Firstly, the morphology of ZnO nanostructures was engineered to demonstrate enhanced optical and electrochemical characteristics of ZnO NCs compared to ZnO nanowires (NWs). ZnO NCs are obtained by chemically etching ZnO NWs. Hence, the morphological effects on various physical properties can be directly compared between NCs and NWs. In recent work of ours, electrochemical characteristics of ZnO NCs and NWs are extensively investigated to demonstrate morphology dependent capacitive performance of one dimensional ZnO nanostructures. Cyclic voltammetry measurements on these two kinds of electrodes in a three-electrode cell confirms that ZnO NCs exhibit a high specific capacitance of 378.5 F g−1 at a scan rate of 20 mV s−1, which is almost twice that of ZnO NWs (191.5 F g−1). In addition, ZnO NCs demonstrated enhanced optical properties, in particular much lower reflectance compared to NWs. We will present recent progress on interesting applications of NCs for energy and optical devices. Secondly, we synthesized carbon nanoplatelets (CNPs) by simple thermal treatment of expandable graphites. By using CNPs as supports, multi- dimensional (1D+2D) carbon nanostructures (CNP-CNTs) were synthesized through direct growth of carbon nanotubes (CNTs) on CNPs. Based on these novel multi-dimensional nanocarbons, we were able to prepare various multi-dimensional and carbon-metal oxides such as hard carbon-CNTs, silica coated CNP-CNTs, and ZnO NCs hybridized CNTs. Basic cyclic voltammetry study on the CNPs and CNP-CNTs reveals that CNP-CNTs possessed enhanced mass specific capacitances compared to those of CNPs. We will present recent progress on our multi-dimensional nanocarbons for electrochemical energy storages. 

Short Biography

Dr. Joonho Bae received his B.S. and M. S. degrees in physics from Seoul National University, Korea in 1996 and 1998, respectively. He was awarded Ph. D. by the University of Texas at Austin in 2007, and carried out postdoctoral research at Georgia Institute of Technology until 2011. After the postdoctoral research, he worked in Samsung electromechanics as a senior researcher. He joined department of nano-physics at Gachon university in 2013, and served as department head for 2 years.

Dr. Bae’s research interests include synthesis of novel nanostructures (such as nanocones, multi-dimensional nanocarbons, and nanowires), their applications in next-generation electrochemical energy storages (supercapacitors and batteries), energy harvesting devices, and nano-optics (notably diffractive optics). In these research areas, he was awarded several significant grants funded by Korean National Research Foundation and Korean Ministry of Industry.

He made significant contributions in the areas. He published over 40 papers in SCI(E)-indexed journals. In particular, fibre supercapacitor, published in Angew. Chem. Int. Ed. (in 2011) and cited over 550 times to date, is considered as one of pioneering works in emerging field of fibre or fabric-based electrochemical energy storages.

Since his doctoral (and postdoctoral) study in the United States, he has been actively involved in international collaborations. He played a pivotal role to form two research projects between Georgia Tech and Samsung, and Korea Electronics Technology Institute. He also has been serving as a Korean delegate for the international standard establishment operated by International Electrotechnical Commission (IEC) TC 113 and 47. He was appointed as committee member of Institute of Electronics and Information Engineers (IEIE) and Korean Society of Computational Neuroscience. He frequently consults for several companies for technical and scientific issues.

 
Talk Keywords
ZnO;nanocones;nanocarbons;multi-dimension.
 
Target Audience
Students, Post doctoral researchers, Industry partners, University faculties
 
Speaker-intro video
TBA 
 

The International Conference on Innovative Applied Energy (IAPE’18)