경희대학교 · 공학
Yung-Eun Sung 교수의 연구실은 에너지 변환 및 저장 기술을 위한 고성능 전기화학 촉매재료의 설계와 응용을 중심으로 연구를 진행하고 있습니다. 주요 연구 분야로는 산소 환원 반응(ORR)과 산소 발생 반응(OER)에 활용 가능한 질소 도핑된 다공성 탄소, 철-질소-탄소(Fe-N-C) 촉매, 고엔트로피 스팟릴 산화물, 그리고 생체 유래 다공성 탄소 기반 촉매 등이 포함되며, 특히 연료전지와 리튬-공기 배터리 등 실용적 에너지 장치에서의 안정성과 내구성을 확보하는 데 초점을 맞추고 있습니다. 또한, 반응 메커니즘 분석과 함께 실장치(메모브레인 전극 어셈블리, MEA)에서의 성능 평가를 통해 기초 연구에서의 성과를 실용화로 이어가는 데 기여하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
The effect of porous structures on the electrocatalytic activity of N-doped carbon is studied by using electrochemical analysis techniques and the result is applied to synthesize highly active and stable Fe-N-C catalyst for oxygen reduction reaction (ORR). We developed synthetic procedures to prepare three types of N-doped carbon model catalysts that are designed for systematic comparison of the porous structures. The difference in their catalytic activity is investigated in relation to the surf
Dye-sensitized solar cells (DSSCs) comprising chemically synthesized nanorods and nanoparticles are investigated. In identical circumstances, except for the charge-collection efficiency, nanorod-based DSSCs show improved photovoltaic properties (6.2 % versus 4.3 % for NP-based DSSCs) owing to the characteristics of slightly enhanced electron transport and predominantly degraded charge recombination, compared with nanoparticle-based DSSC.
The capacity limitations of insertion‐compound cathodes has motivated interest in a sulfur cathode for a rechargeable battery cell with a metallic‐lithium anode; but irreversible capacity loss owing to solubility of intermediate Li 2 S x (x = 2–8) polysulfides in the organic‐liquid electrolytes used has prevented practical application. A dual‐function cathode structure consisting of layered tungsten disulfide (WS 2 ) supported both on the cathode current collector and on a carbon cloth interlaye
Electrochemical production of H2O2 from O2 is a promising alternative to the energy-intensive anthraquinone process that is currently used as an industry standard. Although most research on the oxygen reduction reaction (ORR) has focused on the 4-electron pathway to water relevant to fuel cells, the 2-electron ORR to produce H2O2 is also of significant commercial interest. The first half of this Perspective deals with the progress made in developing noble metal, carbon-based, and single-atom ele
An aryl ether-free less-phenyl adsorbing poly-carbazole-based polymer shows superior performance and durability for anion exchange membrane fuel cells and electrolyzers.
Compared to nanostructured platinum (Pt) catalysts, ordered Pt-based intermetallic nanoparticles supported on a carbon substrate exhibit much enhanced catalytic performance, especially in fuel cell electrocatalysis. However, direct synthesis of homogeneous intermetallic alloy nanocatalysts on carbonaceous supports with high loading is still challenging. Herein, we report a novel synthetic strategy to directly produce highly dispersed MPt alloy nanoparticles (M = Fe, Co, or Ni) on various carbon
A substantial amount of research effort has been directed toward the development of Pt-based catalysts with higher performance and durability than conventional polycrystalline Pt nanoparticles to achieve high-power and innovative energy conversion systems. Currently, attention has been paid toward expanding the electrochemically active surface area (ECSA) of catalysts and increase their intrinsic activity in the oxygen reduction reaction (ORR). However, despite innumerable efforts having been ca
An earth-abundant and feasible air cathode electrocatalyst is of importance for energy devices including fuel cells and metal–air batteries. Herein, hierarchically porous S,N-co-doped carbon materials derived from bamboo are prepared via pyrolysis of bamboo and thiourea to function as oxygen reduction reaction electrocatalysts. Due to their controlled mesopore ratio and increased effective dopant amount, the S,N-co-doped bamboo carbons (SNBCs) present half-wave potentials and stabilities compara
Abstract High‐entropy spinel oxides (HESOs) are a promising class of electrocatalysts whose material properties and catalytic activity can be finely tuned by controlling the elemental composition. Although numerous HESOs are already reported, their compositions are primarily limited to the first‐row transition metals. Herein, the synthesis of a high‐entropy spinel (CrFeCoNiMo) 3 O 4 nanosheet (HEO‐NS) and its application as oxygen evolution reaction (OER) catalyst are reported. The high‐entropy
