Won Tae Choi
· Won Tae Choi Assistant ProfessorVerifiedUniversity of Florida · Chemical Engineering
Active 2012–2025
About
The page provides a list of members and students associated with the Choi Group at the University of Florida, led by Professor Won Tae Choi. The research focus of the group involves electrochemistry, photoelectrochemical processes, and energy conversion technologies. The group conducts projects on material design and characterizations, electrochemical analysis and modeling, microfabrication, and device engineering, with particular interest in soft materials and semiconductor electrodes. The group also explores applications such as carbon dioxide conversion, oxygen evolution reactions, bioelectrocatalysts, and electrocatalysis. Professor Choi's lab welcomes graduate students interested in these areas, offering fully-funded Ph.D. positions that cover stipend, tuition, and health insurance. The lab emphasizes interdisciplinary research involving material science, electrochemistry, and device engineering, and encourages applications from students with diverse backgrounds in chemical engineering, materials science, and related fields.
Research topics
- Materials science
- Chemical engineering
- Chemistry
- Nanotechnology
- Biochemistry
- Optoelectronics
- Organic chemistry
- Inorganic chemistry
- Chromatography
- Physical chemistry
- Composite material
Selected publications
Chemical Communications · 2025-01-01 · 5 citations
articleOpen accessSenior authorWe utilize scanning electrochemical microscopy (SECM) to study the electrocatalytic HMF reduction reaction in aqueous solutions.
Advanced Materials Technologies · 2025-12-12
articleSenior authorCorrespondingABSTRACT Ultramicroelectrodes (UMEs) are powerful electrochemical tools due to their high sensitivity, fast steady‐state response, minimal ohmic losses, and compatibility with in situ/operando measurements. To enable broader utilization of UMEs in electroanalysis, a reliable and broadly applicable fabrication method is needed, one that ensures chemical stability across various environments and supports diverse conductor materials. Here, we report a simple epoxy‐sealing method for fabricating leak‐free and chemically robust UMEs under mild curing conditions (60°C). A systematic investigation of resin‐to‐hardener ratios reveals that a 2:1 ratio optimizes seal integrity and electrochemical performance by eliminating interference from residual unreacted hardener species. The resulting UMEs maintain stable electrochemical responses in both highly acidic (1 M H 2 SO 4 ) and alkaline (1 M KOH) environments. Importantly, this low‐temperature process enables the successful fabrication of UMEs from heat‐sensitive materials (e.g., C, Cu, Mo, W) that are unsuitable for conventional high‐temperature glass sealing. The practical applicability of the epoxy‐sealed UMEs is demonstrated through chloride ion sensing using Ag UMEs (limit of detection: 0.02 m m , achieved without supporting electrolyte) and high‐resolution scanning electrochemical microscopy (SECM) using beveled epoxy‐sealed UMEs. These results underscore the broad utility of the epoxy‐sealing approach for diverse electroanalytical applications.
Journal of Agricultural Engineering · 2025-10-20
articleOpen accessSenior authorSingle-layer perforated air ducts made of plastic films are widely used in greenhouses to control the root-zone environment of crops. However, conventional ducts often exhibit non-uniform airflow and thermal distributions along the duct length, making it difficult to maintain consistent environmental conditions in the greenhouse. To address this issue, a double-layer perforated air duct has been developed and implemented in greenhouses. However, it is necessary to quantitatively evaluate its effectiveness in improving environmental uniformity. In this study, computational fluid dynamics (CFD) simulations were conducted to compare the internal airflow and jet flow characteristics between the conventional single-layer duct and the proposed double-layer duct. In addition, three double-layer duct designs with different hole arrangements, sizes, and spacings were analyzed. The double-layer duct significantly improved the uniformity of the jet flow temperature and mass flow rate compared with the single-layer duct. The space between the inner and outer tubes in the double-layer duct acted as both a thermal insulation layer and a pressure chamber, maintaining a high, uniform internal static pressure and a low, consistent air velocity. The maximum improvement in temperature uniformity was 75%, and that in mass flow rate was 42%. The proposed double-layer perforated air duct can contribute to enhanced environmental uniformity in greenhouses by supplying jet flows through its holes at a more consistent temperature and mass flow rate along the duct length.
The Journal of Physical Chemistry Letters · 2025-06-07
articleSenior authorCorrespondingPhotoelectrochemical cells based on polymer semiconductors are a viable platform for solar-to-fuel conversion, yet optimizing photogenerated charge transport remains a key challenge. Understanding and controlling these charge carrier dynamics are critical for advancing device efficiency. Here, we report that electrochemical doping of a semiconducting polymer, poly(benzo(1,2-b:4,5-b′)dithiophene-alt-dione) (PBDB-T), effectively enhances photoelectrochemical activity. We systematically investigate the influence of doping species (Cl–, Br–, and I–) on charge carrier dynamics using intensity-modulated photocurrent spectroscopy (IMPS). Our results indicate that (1) all halide dopants accelerate both charge transfer and recombination kinetics, (2) the greater relative increase in the charge transfer rate leads to an overall improvement in charge transfer efficiency, and (3) Cl– doping yields the highest photocurrent enhancement, which is attributed to efficient exciton separation. These findings provide valuable insight into how dopant identity influences charge carrier dynamics and offer a strategy for designing high-performance organic photoelectrodes through controlled electrochemical doping.
Journal of Materials Chemistry A · 2024-01-01 · 10 citations
articleSenior authorCorrespondingSurface interrogation scanning electrochemical microscopy was employed to assess the electrocatalytic activity of CuO films for the oxygen evolution reaction in an alkaline solution.
Bioinspired Black Nickel Films for Enhanced Electrocatalytic Hydrogen Evolution Reaction
SSRN Electronic Journal · 2024-01-01
preprintOpen accessSenior authorJournal of the Korean Society for Library and Information Science · 2021-02-01 · 2 citations
articleOpen accessSenior authorTransactions of the ASABE · 2020 · 2 citations
- Materials science
- Nanotechnology
- Chemical engineering
Highlights Nanoporous superhydrophobic surfaces were fabricated using electrochemical etching and Teflon coating. Adhesion of Listeria monocytogenes to the nanoengineered stainless steel surfaces was reduced. Self-cleanable food-contact surfaces prevent bacterial attachment and subsequent biofilm formation. Abstract . Bacterial attachment on solid surfaces and subsequent biofilm formation is a significant problem in the food industry. Superhydrophobic surfaces have potential to prevent bacterial adhesion by minimizing the contact area between bacterial cells and the surface. In this study, stainless steel-based superhydrophobic surfaces were fabricated by manipulating nanostructures with electrochemical etching and polytetrafluoroethylene (PTFE) film. The formation of nanostructures on stainless steel surfaces was characterized by field emission scanning electron microscopy (FESEM). The stainless steel surfaces etched at 10 V for 5 min and at 10 V for 10 min with PTFE deposition resulted in average water contact angles of 154° ±4° with pore diameters of 50 nm. In addition, adhesion of Listeria monocytogenes was decreased by up to 99% compared to the bare substrate. These findings demonstrate the potential for the development of antibacterial surfaces by combining nanoporous patterns with PTFE films. Keywords: Electrochemical etching, PTFE, Nanoengineered surface, L. monocytogenes, Superhydrophobic.
The Journal of Physical Chemistry C · 2020 · 22 citations
1st authorCorresponding- Materials science
- Inorganic chemistry
- Chemical engineering
We demonstrate the dependence of photoelectrochemical properties of the organic semiconductor film poly(3-hexylthiophene) (P3HT) on the dopant species. We use cyclic voltammetry to characterize electrochemical doping/undoping behavior and show that the reversibility of doping/undoping depends on the incorporated anions. Irreversible doping is achieved with the incorporation of hydrophilic or bulky anions such as bromide or tetraphenylborate. The irreversible doping on the P3HT film leads to an increase in photocurrent with a high photo-to-dark current ratio. This study highlights that interaction between dopant and organic semiconductor is a significant parameter for the design of stable organic photoelectrochemical and other optoelectronic cells.
LWT · 2020 · 25 citations
1st authorCorresponding- Materials science
- Chemistry
- Chromatography
Frequent coauthors
- 6 shared
Victor Breedveld
Bioproducts Institute
- 5 shared
Dennis W. Hess
- 5 shared
Preet M. Singh
Georgia Institute of Technology
- 5 shared
Xiaolong Yang
Nanjing University of Aeronautics and Astronautics
- 4 shared
Soojin Jun
University of Hawaiʻi at Mānoa
- 3 shared
Yeongseon Jang
University of Florida
- 3 shared
Kookheon Char
Seoul National University
- 3 shared
Zunlong Ke
The University of Texas at Austin
Labs
Not provided
Education
Ph.D., Chemical Engineering
Georgia Institute of Technology
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