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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM

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Ag2S-CoS hetero-nanowires terminated with stepped surfaces for improved oxygen evolution reaction

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Title
Ag2S-CoS hetero-nanowires terminated with stepped surfaces for improved oxygen evolution reaction
Author
Lee, ChangsooLee, ChulheeShin, KihyunSong, TaeyoungJeong, Hu YoungJeon, Duk YoungLee, Hyuck Mo
Issue Date
2019-09
Publisher
Elsevier B.V.
Citation
CATALYSIS COMMUNICATIONS, v.129, pp.105749
Abstract
Water electrolysis has received great attention for producing hydrogen, but sluggish kinetics of oxygen evolution reaction (OER) has remained a big challenge. Recently, cobalt sulfide materials have been widely explored as great choice in highly efficient electrocatalysts due to their good electrical conductivity and bi-functionality toward OER and hydrogen evolution reaction (HER). However, cobalt sulfide shows outstanding HER activity, but its OER activity should be improved. Herein, hexagonal-phase cobalt sulfide (CoS) nanowires with abundant stepped surfaces and defect sites were prepared via a seed-growth approach with silver sulfide (Ag2S) nanoparticles. The Ag2S-CoS hetero-nanowires (HNWs) exhibited excellent electrochemical performances for oxygen evolution reaction (overpotential = 275 mV, Tafel slope = 77.1 mVdec−1, charge transfer resistance = 1.3 Ω) in 1.0 M KOH solution. The origin of superior activity was investigated using a combined experimental and theoretical approach. This work highlights the importance of surface defects for improving oxygen evolution reaction performance of water electrolysis.
URI
https://scholarworks.unist.ac.kr/handle/201301/27177
URL
https://www.sciencedirect.com/science/article/pii/S1566736719302110?via%3Dihub
DOI
10.1016/j.catcom.2019.105749
ISSN
1566-7367
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