Yu Seung Kim

The Effect of Patient Clothing Design Perception on Medical Service Satisfaction: The Mediating Effect of Perceived Dignity

Jang-Hyeon Kim, Yu Seung Kim

Adsorption‐Engineered Hydrocarbon Ionomers for Durable Proton‐Exchange Membrane Fuel Cells

Heemin Park, Kate Chen, Su Min Ahn, Hengquan Guo et autres

ABSTRACT Reducing reliance on perfluoroalkyl substances (PFAS) in proton‐exchange membrane fuel cells requires hydrocarbon ionomers that combine high performance with long‐term durability, a persistent challenge in catalyst‐layer design. Here, we identify oxidation‐driven ionomer‐catalyst interfacial degradation as a dominant failure pathway in hydrocarbon …

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Electrochemical hydrogen pumps: fundamentals, progress, and prospects

Liam Twight, Manjeet Chhetri, N. Ghorbani, Daryl Ludlow et autres

Abstract Electrochemical hydrogen pumps offer a promising approach for selectively extracting hydrogen from dilute gas streams while simultaneously enabling high-efficiency compression. Currently, three main EHP technologies are under development: low temperature proton exchange membrane systems, high temperature proton exchange membrane systems, and …

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A Relationship Study of Aromatic Ring Structures, Nanostructure Morphology, and Fuel Cell Performance of Anion Exchange Membranes

Ramali C. Walgama, Xinyu Guo, Gengyi Zhang, Fathy Attia et autres

The rational design of anion exchange membranes and ionomers is crucial for advancing high-performance, cost-effective anion exchange membrane fuel cells and water electrolyzers. This study systematically investigates the structure–property–performance relationships of a series of polyaromatic anion exchange polymers, including biphenyl (BPN1-100), m …

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The Effect of Perceived Quality on Brand Loyalty in Golfwear Purchases: The Mediating Role of Involvement among Active Seniors

Jang-Hyeon Kim, Yu Seung Kim

골프웨어는 기능성과 심미성, 브랜드 이미지를 동시에 요구하는 고관여 스포츠웨어로서, 특히 액티브 시니어 소비자의 신체적 특성과 라이프스타일을 반영한 실용적 접근이 요구된다. 본 연구는 골프웨어 구매 경험이 있는 액티브 시니어 소비자를 대상으로, 골프웨어 구매 시 인식되는 지각된 품질, 관여도, 브랜드 충성도 간의 구조적 관계를 …

Perceptions of Korean Symbolic Images among University Students

Jang-Hyeon Kim, Yu Seung Kim

본 연구는 현대 대학생들이 체감하는 한국의 상징적 이미지에 대한 인지적 인식과 감정적 반응을 탐색하는 것을 목적으로 하였다. 연구 결과는 다음과 같다. 첫째, 대학생들이 가장 대표적인 한국의 상징으로 인식한 요소는 태극기, 무궁화, 한글, 호랑이, 소나무, 까치, 봉황 등이었다. 둘째, 상징 요소별 연상된 인지적 …

Effect of Ionomer on CO 2 Reduction at Atomically Dispersed Ni─N─C Catalyst

Youngdon Ko, Hengquan Guo, Luigi Osmieri, Hanguang Zhang et autres

Abstract Ionomers play an important role in carbon dioxide (CO 2 ) electrolyzers by affecting CO 2 reduction reaction (CO 2 RR) at the cathode. In this study, we systematically examines the impact that different ionomers have on CO 2 RR at …

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Making hydrogen production durable

Yu Seung Kim

An interphase shields polymer electrolytes from electrochemical oxidation in an alkaline environment.

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Identification and Characterization of Airborne Bacteria and Air Disinfection of Indoor Spaces in Multi-use Facilities

Dongryeoul Bae, Yu Seung Kim, Chul‐Kyu Lee, Kwang‐Young Song et autres

Abstract Consequent to the coronavirus disease 2019 (COVID-19) pandemic, indoor disinfection using high-pressure sprays has been prioritized. For high-pressure sprays to be effective, particles must be dispersed within a range of 10–30 µm. We had previously developed a novel disinfection system, which …

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Sulfonated Diels–Alder Poly(Phenylene)s in Membrane Electrode Assemblies for Fuel Cells

Heemin Park, Tanya Agarwal, Youngkwang Kim, Cy Fujimoto et autres

The transition to environmentally sustainable materials in fuel cells requires alternatives to persistent polyfluoroalkyl substances (PFAS) like Nafion. This study investigates the performance‐limiting factors of membrane electrode assemblies (MEAs) utilizing sulfonated Diels–Alder poly(phenylene)s (sDAPPs) as PFAS‐free polymer electrolytes. Among the configurations evaluated, …

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Unitized bifunctional electrochemical hydrogen pumps for hydrogen-enriched natural gas

Manjeet Chhetri, Prashant Sharan, Daniel P. Leonard, Sandip Maurya et autres

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(Invited) Electrochemical Oxidation of Anion Exchange Membranes

Yu Seung Kim

Over the past five years, our group identified electrochemical oxidation of anion exchange polymers as a key performance-limiting factor in anion exchange membrane water electrolyzers [1-3]. In this presentation, we explore the mechanisms of electrochemical oxidation and strategies to mitigate it. We …