However, it is still a great challenge to develop highly efficient and stable oxygen reduction reaction (ORR) electrocatalysts at a low cost since the scarcity, high cost and poor long-term stability of the Pt-based ORR catalysts are main obstacles for commercialization of the fuel cell technology. Actually, the catalysts for oxygen reduction play a key role in regulating the performance of fuel cells. Toward this end, advanced technologies for both energy conversion (e.g., solar cells 3, 4 and fuel cells 5) and storage (e.g., supercapacitors 6 and batteries 7, 8) are being studied extensively. Since the shortage of the traditional fossil fuels and CO 2 emission issues 1, 2, it become an urgent task to develop the renewable and clean energy sources. These results clearly suggest that PAF-derived N-doped carbon material is promising metal-free ORR catalyst for fuel cells and capacitor electrode materials. Moreover, N-PAF-Carbon also possesses large capacitance (385 F g −1) and excellent performance stability without any loss in capacitance after 9000 charge–discharge cycles.
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Moreover, the N-PAF-Carbon displays free from the CO and methanol crossover effect and better long-term durability compared with the commercial Pt/C benchmark.
Actually, the N-PAF-Carbon obtains ~70 mV half-wave potential enhancement and 80% increase as to the limiting current after N doping. Our results suggest the N-doping enhance not only the ORR electronic catalysis but also the supercapacitive performance. The “graphitic” and “pyridinic” N species, large surface area and similar pore size as electrolyte ions endow the nitrogen-doped PAF-Carbon with outstanding electronic performance. In this work, we use porous aromatic framework (PAF) as precursor to produce nitrogen-doped 3D carbon materials, i.e., N-PAF-Carbon, by exposing NH 3 media. Thus, advanced technologies for both energy conversion (e.g., solar cells and fuel cells) and storage (e.g., supercapacitors and batteries) are being studied extensively. Owing to the shortage of the traditional fossil fuels caused by fast consumption, it is an urgent task to develop the renewable and clean energy sources.