Journal
ELECTROCHIMICA ACTA
Volume 318, Issue -, Pages 272-280Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.06.081
Keywords
Oxygen reduction reaction; Supercapacitors; Heteroatom doping; Nanospheres
Categories
Funding
- National Key Research and Development Plan [2017YFB0103001]
- National Natural Science Foundation of China [U1705252]
- National Natural Science Foundation of Fujian Province [U1705252]
- Guangxi Science and Technology Project [AA17204083, AB16380030]
- Danish project of Initiative towards Non-Precious Metal Polymer Fuel Cells [4106-000012B]
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Heteroatom doped carbon materials have been emerging as active materials for electrochemical energy generation and storage. The activity of such carbon materials is strongly depended the specific molecular structure of selected precursors and their synthetic strategy. Herein, we report an efficient bifunctional N,S co-doped carbon nanosphere (NS/C) via pyrolysis of poly (2,6-Diaminopyridine) spheres as precursor for the first time, in which 2,6-Diaminopyridine was polymerized in water using ammonium persulfate as both initiator and sulfur source in the absence of templates and surfactants. The resultant NS/C exhibits uniformly spherical structure filled with hierarchical pores, outstanding electronic conductivity and highly effective doping content of N(4.02 at%) and S(0.87 at%) elements. Electrochemical measurements demonstrate that the NS/C not only exhibits outstanding specific capacitance of 800 F/g in 6.0 M KOH and 710 F/g in 1.0MH(2)SO(4), but also displays excellent catalytic performance for oxygen reduction reaction (ORR) with the onset potential at 1.01 V vs RHE and the half-wave potential at 0.85 V vs RHE in 0.1M KOH, outperforming the activity of carbon materials previously reported. The superior electrochemical properties of NS/C is directly attributed to the synergetic effect of N,S co-doping and its excellent conductivity, accessibility, high specific surface area as well as hierarchical pore structure. (C) 2019 Elsevier Ltd. All rights reserved.
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