【摘 要】
：
Exploring inexpensive and efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical for rechargeable metal-air batteries.Herein,we report a new 3D hierarchical sulfur and nitrogen co-doped
【机 构】
：
Key Laboratory of Mesoscopic Chemistry of MOE and Collaborative Innovation Center of Chemistry for L
论文部分内容阅读
Exploring inexpensive and efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical for rechargeable metal-air batteries.Herein,we report a new 3D hierarchical sulfur and nitrogen co-doped carbon nanocages (hSNCNC) as a promising bifunctional oxygen electrocatalyst by an in-situ MgO template method with pyridine and thiophene as the mixed precursor.The as-prepared hSNCNC exhibits a positive half-wave potential of 0.792V (vs.reversible hydrogen electrode,RHE) for ORR,and a low operating potential of 1.640V at a 10mA cm 2 current density for OER.The reversible oxygen electrode index is 0.847V,far superior to commercial Pt/C and lrO2,which reaches the top level of the reported bifunctional catalysts.Consequently,the hSNCNC as air cathodes in an assembled Zn-air battery features low charge/discharge overpotential and long lifetime.The remarkable properties arises from the introduced multiple heteroatom dopants and stable 3D hierarchical structure with multi-scale pores,which provides the abundant uniform high-active S and N species and efficient charge transfer as well as mass transportation.These results demonstrate the potential strategy in developing suitable carbon-based bi-/multi-functional catalysts to enable the next generation of the rechargeable metal-air batteries.
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