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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Bifunctional non-noble metal oxide nanoparticle electrocatalysts through lithium-induced conversion for overall water splitting

Cited 10 times inthomson ciCited 9 times inthomson ci
Title
Bifunctional non-noble metal oxide nanoparticle electrocatalysts through lithium-induced conversion for overall water splitting
Author
Wang, HaotianLee, Hyun-WookDeng, YongLu, ZhiyiHsu, Po-ChunLiu, YayuanLin, DingchangCui, Yi
Keywords
HYDROGEN EVOLUTION REACTION; OXYGEN EVOLUTION; CATALYSIS; NANOSHEETS; OXIDATION; HYDROXIDE
Issue Date
2015-06
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.6, no., pp.7261 -
Abstract
Developing earth-abundant, active and stable electrocatalysts which operate in the same electrolyte for water splitting, including oxygen evolution reaction and hydrogen evolution reaction, is important for many renewable energy conversion processes. Here we demonstrate the improvement of catalytic activity when transition metal oxide (iron, cobalt, nickel oxides and their mixed oxides) nanoparticles (~20 nm) are electrochemically transformed into ultra-small diameter (2–5 nm) nanoparticles through lithium-induced conversion reactions. Different from most traditional chemical syntheses, this method maintains excellent electrical interconnection among nanoparticles and results in large surface areas and many catalytically active sites. We demonstrate that lithium-induced ultra-small NiFeOx nanoparticles are active bifunctional catalysts exhibiting high activity and stability for overall water splitting in base. We achieve 10 mA cm−2 water-splitting current at only 1.51 V for over 200 h without degradation in a two-electrode configuration and 1 M KOH, better than the combination of iridium and platinum as benchmark catalysts.
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DOI
10.1038/ncomms8261
ISSN
2041-1723
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ECHE_Journal Papers
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