Tuning cobalt and nitrogen co-doped carbon to maximum catalytic sites by superabsorbent for efficient oxygen reduction.
CHEMSUSCHEM(2018)
摘要
The electrocatalytic performance and cost of oxygen reduction reaction (ORR) catalysts are crucial to many renewable energy conversion and storage systems/devices. Recently, transition-metal/nitrogen-doping carbon catalysts (M-N-C) have attracted tremendous attention due to their low cost and excellent catalytic activities; however, they are restricted in large-scale commercial applications by complex preparation processing. Here, a facile strategy to prepare Co-N-C catalysts has been developed. A kind of superabsorbent resin normally found in diapers, poly(acrylic acid-acrylamide), is used to adsorb a transition-metal cobalt salt and a pyrolysis strategy at 800 degrees C under an argon atmosphere is followed. The resin simultaneously plays a multiple role, which includes structural support, dispersing cobalt ions by coordinate bonds, and providing a carbon and nitrogen source. Attributed to the conductive carbon frameworks and abundant catalytic sites, the Co-N-C catalyst exhibits an excellent electrocatalytic performance. High onset potential (0.96 V vs. reversible hydrogen electrode, RHE), half-wave potential (0.80 V vs. RHE), and a large diffusion-limited current density (4.65 mA cm(-2)) are achieved for the ORR, which are comparable or superior to the commercial 20% Pt/C and reported M-N-C ORR electrocatalysts. This work provides a universal dispersion technology for Co-N-C catalyst, which makes it a very promising candidate toward the ORR.
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关键词
catalysts,cobalt,nitrogen,oxygen reduction reaction,superabsorbent resin
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