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Hierarchically Ordered Porous Carbon with Atomically Dispersed FeN4 for Ultraefficient Oxygen Reduction Reaction in Proton-Exchange Membrane Fuel Cells |
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| Authors: | Mengfei Qiao Ying Wang Quan Wang Guangzhi Hu Xamxikamar Mamat Shusheng Zhang Shuangyin Wang |
| Affiliation: | 1. Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, School of Chemical Science and Technology, Yunnan University, Kunming, 650504 China Key Laboratory of Chemistry of Plant Resources in Arid Regions, State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Science, Urumqi, 830011 China These authors contributed equally to this work.;2. Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, School of Chemical Science and Technology, Yunnan University, Kunming, 650504 China These authors contributed equally to this work.;3. Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, School of Chemical Science and Technology, Yunnan University, Kunming, 650504 China;4. Key Laboratory of Chemistry of Plant Resources in Arid Regions, State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Science, Urumqi, 830011 China;5. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450000 China;6. State Key Laboratory of Chem/Bio-Sensing and Chemometrics,Provincial Hunan Key Laboratory for Graphene Materials and Devices, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082 China |
| Abstract: | The low catalytic activity and poor mass transport capacity of platinum group metal free (PGM-free) catalysts seriously restrict the application of proton-exchange membrane fuel cells (PEMFCs). Catalysts derived from Fe-doped ZIF-8 could in theory be as active as Pt/C thanks to the high intrinsic activity of FeN4; however, the micropores fail to meet rapid mass transfer. Herein, an ordered hierarchical porous structure is introduced into Fe-doped ZIF-8 single crystals, which were subsequently carbonized to obtain an FeN4-doped hierarchical ordered porous carbon (FeN4/HOPC) skeleton. The optimal catalyst FeN4/HOPC-c-1000 shows excellent performance with a half-wave potential of 0.80 V in 0.5 m H2SO4 solution, only 20 mV lower than that of commercial Pt/C (0.82 V). In a real PEMFC, FeN4/HOPC-c-1000 exhibits significantly enhanced current density and power density relative to FeN4/C, which does not have an optimized pore structure, implying an efficient utilization of the active sites and enhanced mass transfer to promote the oxygen reduction reaction (ORR). |
| Keywords: | Brennstoffzellen Stofftransfer Mesoporöse Materialien Sauerstoffreduktionsreaktion Zeolith-Analoga |