경희대학교 · Engineering
Dongwhi Choi 교수의 연구실은 기계적 에너지를 효율적으로 전기로 변환하는 신소재 기반의 트라이보전기 나노발전기(TENG) 기술을 핵심으로 하며, 특히 액체-고체 접촉 전기화학 현상과 드롭렛 기반 전력 수확 기술에 초점을 맞추고 있습니다. 다양한 물질과 표면 구조를 활용한 고성능 TENG의 설계, 4D 프린팅을 통한 유연하고 생분해 가능한 구조의 통합, 그리고 초수성/초불착 나노구조를 활용한 에너지 수확 최적화 기술을 개발하고 있습니다. 특히, 액체의 전기적 성질을 정량적으로 기술하는 '액체 트라이보시리즈'의 수립은 이 분야의 기초 이론을 확립하는 데 기여하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Serious climate changes and energy-related environmental problems are currently critical issues in the world. In order to reduce carbon emissions and save our environment, renewable energy harvesting technologies will serve as a key solution in the near future. Among them, triboelectric nanogenerators (TENGs), which is one of the most promising mechanical energy harvesters by means of contact electrification phenomenon, are explosively developing due to abundant wasting mechanical energy sources
We report that a droplet dispensed from a micropipette almost always has a considerable electrical charge of a magnitude dependent on the constituents of the droplet, on atmospheric humidity and on the coating material of pipette tip. We show that this natural electrification of a droplet originates from the charge separation between a droplet and pipette tip surface by contact with water due to the ionization of surface chemical groups. Charge on a droplet can make it difficult to detach the dr
As the first invention to efficiently harvest electricity from ambient mechanical energy by using contact electrification, the triboelectric nanogenerator has elicited worldwide attention because of its cost-effectiveness and sustainability. This study exploits a superhydrophobic nanostructured aluminum tube to estimate electrical output for solid-water contact electrification inside a tubular system. The linearly proportional relationship of short-circuit current and open-circuit voltage to the
Using thermal nanoimprinting, a novel transparent and flexible nanotopographical triboelectric nanogenerator (TENG), with simultaneous nanoreplication and integration of the contact layer with the electrode layer, is first demonstrated. It is expected that the present rapid one-step fabrication methodology well give "disposability" to the TENG with extremely reduced manufacturing costs, which may allay commercialization concerns.
The triboelectric series is a generally accepted method for describing the triboelectric effect. It provides a way to control the double face of the ubiquitous triboelectric effect: causes of unpredictable accidents and the resultant surface charge as energy sources. However, previous studies have been biased in solids despite being observed in liquids (liquid-solid contact electrification). Therefore, a liquid triboelectric series is necessary to be established to manipulate the liquid triboele
