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albert199010

新虫 (小有名气)

应助: 0 (幼儿园)
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虫号: 1359336
注册: 2011-08-02
专业: 电化学

[交流] Manthiram组最新氧催化文章已有1人参与

题目：Delineating the roles of Co3O4 and N-doped
carbon nanoweb (CNW) in bifunctional Co3O4/
CNW catalysts for oxygen reduction and oxygen
evolution reactions

关于氧催化催化剂中碳材料和金属氧化物的催化活性

摘要：While many synthesis methods have been reported for Co3O4–carbon nanocomposites as a bifunctional
electrocatalyst for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in
alkaline solutions, the individual contributions of Co3O4 and CNW towards ORR and OER are still not
clear. Here, we report the individual functionality of Co3O4 and the N-doped carbon nanoweb (CNW) in
ORR and OER. The Co3O4/CNW bifunctional catalysts were synthesized by an in situ growth of Co
precursors onto CNW followed by a controlled heat treatment. The specific functions of Co3O4 and
CNW were delineated by rotating disk electrode measurements. It was found that Co3O4 alone exhibited
poor ORR catalytic activity. However, in the presence of CNW, Co3O4 assisted the selective fourelectron
oxygen reduction over the two-electron pathway. Analyses of the Tafel slope and reaction
order suggested that Co3O4 acted as the primary catalytic site for OER. CNW improved the electronic
conduction between Co3O4 and the current collector. CNW underwent serious degradation at the high
potential of the OER but its stability improved greatly upon the deposition of Co3O4. Two possible
mechanisms for the improved catalytic stability are discussed. The findings demonstrate the specific
functions of Co3O4 and CNW in catalyzing the OER and ORR and further establish an understanding of
the synergy of the composite in electrocatalysis.

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