Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 164, Issue 14, Pages A3595-A3601Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0461714jes
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Funding
- National Nature Science Foundation of China [21671200, 21571189]
- Fujian Provincial Natural Science Foundation of China [2015J01072]
- Hunan Provincial Science and Technology Plan Project, China [2016TP1007, 2017TP1001]
- Open-End Fund for Valuable and Precision Instruments of Central South University [CSUZC201729]
- Innovation-Driven Project of Central South University [2016CXS009, 2016CX037]
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Highly efficient and low-cost catalysts are greatly desirable for oxygen reduction reaction (ORR) to replace the costly Pt/C. Here, we report a novel Ag/Fe3O4-N-doped ketjenblack carbon (KB) composite synthesized by a facile and scalable strategy using silver nitrate, iron nitrate, glucose, urea and KB as raw materials. This method involves an initial one-pot hydrothermal treatment and the subsequent pyrolysis process as well as hydrochloric acid treatment. The as-prepared composite with a low Ag mass ratio of 4.22% shows excellent catalytic activity toward ORR in alkaline solution (half wave potential of 0.82 V, limiting current density of 6.0 mA cm(-2)). The half-wave potential is only 8.2 mV negative shift after 2000 cycles, even better than the 20% Pt/C, demonstrating remarkable stability. When used as cathode catalyst in home-made Al-air battery, this composite shows a higher discharge voltage of 1.49 V at a current density of 50 mA cm(-2) than that of Pt/C (1.45 V). This superior performance should be attributed to the synergistic effects of Ag nanoparticles, carbon surrounded Fe3O4, Fe-N active sites and N-doped KB. (c) 2017 The Electrochemical Society. All rights reserved.
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