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Highly Crumpled Hybrids of Nitrogen/Sulfur Dual-Doped Graphene and Co 9 S 8 Nanoplates as Efficient Bifunctional Oxygen Electrocatalysts.
ACS Applied Materials & Interfaces 2017 April 13
A bifunctional electrocatalyst for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is highly attractive for the manufacture of clean energy conversion devices. In this work, highly crumpled hybrid of nitrogen and sulfur dual-doped graphene and quasi-hexagonal Co9 S8 nanoplates (Co9 S8 /NSGg-C3N4 ) is fabricated via a facile ionic assembly approach. The unique structure of Co9 S8 /NSGg-C3N4 renders it high specific surface area (288.3 m2 g-1 ) and large pore volume (1.32 cm3 g-1 ). As the electrocatalyst for ORR, Co9 S8 /NSGg-C3N4 demonstrates excellent performance with the onset potential of -0.02 V vs Ag/AgCl and the limited current density of 6.05 mA cm-2 at -0.9 V vs Ag/AgCl. Co9 S8 /NSGg-C3N4 also presents outstanding catalytic activity toward OER by delivering a limited current density of 48 mA cm-2 at 1 V vs Ag/AgCl. The bifunctional catalytic behaviors of Co9 S8 /NSGg-C3N4 enable the assembly of a rechargeable Zn-air battery with it as the cathode catalyst, which exhibits stable discharge/charge voltage plateaus upon long time cycling over 50 h.
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