期刊
ACS CATALYSIS
卷 5, 期 7, 页码 4066-4074出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b00349
关键词
water splitting; oxygen evolution; hydrogen evolution; cobalt phosphide nanoparticle; in situ transformation
资金
- Global Frontier R Program on Center for Multiscale Energy System [NRF-2012M3A6A7054283]
- NRF grant - MSIP [2014R1A2A2A04003865]
- KIST Institutional Program of Korea Institute of Science and Technology (KIST)
- New and Renewable Energy Core Technology Program of KETEP grant - MOTIE [20133030011320]
- KCRC grant - MSIP [2014M1A8A1049349]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20133030011320] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2011-0031571, 2014R1A2A2A04003865] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Reported herein is elucidation of a novel Co-based oxygen evolution catalyst generated in situ from cobalt phosphide (CoP) nanoparticles. The present CoP nanoparticles, efficient alkaline hydrogen-evolving materials at the cathode, are revealed to experience unique metamorphosis upon anodic potential cycling in an alkaline electrolyte, engendering efficient and robust catalytic environments toward the oxygen evolution reaction (OER). Our extensive ex situ characterization shows that the transformed catalyst bears porous and nanoweb-like dispersed morphologies along with unique microscopic environments mainly consisting of discrete cobalt-oxo/hydroxo molecular units within a phosphate-enriched amorphous network. Outstanding OER efficiency is achievable with the activated catalyst, which is favorably comparable to even a precious iridium catalyst. A more remarkable feature is its outstanding long-term stability, superior to iridium and conventional cobalt oxide-based materials. Twelve-hour bulk electrolysis continuously operating at high current density is completely tolerable with the present catalyst.
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