<P>The present work introduces spinel oxide nanocrystals self-assembled into mesoporous spheres that are bifunctionally active towards catalyzing both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). The electrochemic...
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https://www.riss.kr/link?id=A107735700
2017
-
SCOPUS,SCIE
학술저널
2258-2266(9쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>The present work introduces spinel oxide nanocrystals self-assembled into mesoporous spheres that are bifunctionally active towards catalyzing both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). The electrochemic...
<P>The present work introduces spinel oxide nanocrystals self-assembled into mesoporous spheres that are bifunctionally active towards catalyzing both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). The electrochemical evaluation reveals that (Ni, Co)(3)O-4 demonstrates a significantly positive-shifted ORR onset and half-wave potentials [-0.127 and -0.292 V vs. saturated calomel electrode (SCE), respectively], whereas Co3O4 results in a negative-shifted OER potential (0.65 V vs. SCE) measured at 10 mA cm(-2). Based on the DFT analysis, the potential at which all oxygen intermediate reactions proceed spontaneously is the highest for (Ni, Co)(3)O-4 (U= 0.66 eV) during ORR, whereas it is the lowest for Co3O4 (U= 2.09 eV) during OER. The high ORR activity of (Ni, Co)(3)O-4 is attributed to the enhanced electrical conductivity of the spinel lattice, and the high OER activity of Co3O4 is attributed to relatively weak adsorption energy promoting rapid release of evolved oxygen.</P>