Template-directed synthesis of nitrogen- and sulfur-codoped carbon nanowire aerogels with enhanced electrocatalytic performance for oxygen reduction |
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| Authors: | Shaofang Fu Chengzhou Zhu Junhua Song Mark H. Engelhard Xiaolin Li Peina Zhang Haibing Xia Dan Du Yuehe Lin |
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| Affiliation: | 1. School of Mechanical and Materials Engineering, Washington State University, WA 99164, USA;2. Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, USA;3. Energy and Environmental Directory, Pacific Northwest National Laboratory, Richland, WA 99354, USA;4. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;5. School of Mechanical and Materials Engineering, Washington State University, WA 99164, USA;Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, USA |
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| Abstract: | Heteroatom doping,precise composition control,and rational morphology design are efficient strategies for producing novel nanocatalysts for the oxygen reduction reaction (ORR) in fuel cells.Herein,a cost-effective approach to synthesize nitrogen-and sulfur-codoped carbon nanowire aerogels using a hard templating method is proposed.The aerogels prepared using a combination of hydrothermal treatment and carbonization exhibit good catalytic activity for the ORR in alkaline solution.At the optimal annealing temperature and mass ratio between the nitrogen and sulfur precursors,the resultant aerogels show comparable electrocatalytic activity to that of a commercial Pt/C catalyst for the ORR.Importantly,the optimized catalyst shows much better long-term stability and satisfactory tolerance for the methanol crossover effect.These codoped aerogels are expected to have potential applications in fuel cells. |
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| Keywords: | heteroatom-doped carbons porous nanomaterials aerogels metal-free catalysts oxygen reduction reaction |
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