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Arranging Electronic Localization of ptcu nanoalloys to Stimulate Improved Oxygen Electroreduction for High-Performance Fuel Cells

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CCS Chemistry 2023年第11期5卷 2545-2556页

作者： Bing Wu Jiayong Xiao Longbin Li Ting Hu Ming Qiu Dirk Lützenkirchen-Hecht Kai Yuan Yiwang Chen Institute of Polymers and Energy Chemistry College of Chemistry and Chemical EngineeringNanchang UniversityNanchang 330031 School of Physics and Materials Science Nanchang UniversityNanchang 330031 Central China Normal University Wuhan 430079 Faculty of Mathematics and Natural Sciences-Physics Department Bergische Universität WuppertalWuppertal D-42119 National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang 330022

Developing exceptionally durable and efficient oxygen reduction reaction(ORR)catalysts is of paramount importance to the widespread commercialization of proton exchange membrane fuel cells(PEMFCs)but is still ***,ptcu nanoalloys rooted on nitrogen-doped carbon nanosheets(ptcuNC-700)with fully exposed ptcu nanoalloys and strong metal–support interaction were *** from its structural and compositional merits,ptcuNC-700 showcases superior ORR activity and stability with a specific activity of 1.05mA cm^(−2)and mass activity of 0.45 A mgPt^(−1),4.2-fold and 3.7-fold higher than Pt/C(0.25 mA cm^(−2)and 0.12 A mgPt^(−1)),***,ptcuNC-700 exhibits first-class performance in H2/air PEMFC assessment and delivers a peak power density of 929.7 mW cm^(−2)and excellent cycling stability up to 30,000 *** calculations disclose that the synergistic effect of alloying Pt with Cu combined with the strong interaction between ptcu nanoalloys and nitrogen-doped carbon nanosheets can effectively modify the local electron configuration and density of states of Pt sites approaching the Fermi ***,the ptcu-alloy catalysts realized here diminish the energy barrier for ORR and accelerate their reaction *** work provides a reliable and effective approach to boost the activity and stability of Pt alloy-based ORR electrocatalysts in PEMFCs.

关键词： ptcu nanoalloy strong metal-support interaction stability oxygen reduction reaction fuel cells

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Wavy ptcu alloy nanowire networks with abundant surface defects enhanced oxygen reduction reaction

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Nano Research 2019年第11期12卷 2766-2773页

作者： Dahui Fang Lei Wan Qike Jiang Hongjie Zhang Xuejun Tang Xiaoping Qin Zhigang Shao Zidong Wei Fuel Cell Systerm and Engineering Laboratory Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Bejing 100049China The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversitBeijing 100084China Advanced Electrorn Microscopy Research Group Dalian Inrstitute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China

Bimetalic platinum-copper(Pt-Cu)alloy nanowires have emerged as a novel class of fuel cell electrocatalysts for oxygen reduction reaction(ORR)due to their intrinsic high catalytic activity and durability,but preparing such electrocatalysts with clean surface via facile method is still a ***,ptcu alloy with nanowire networks(NWNs)structure is obtained by a simple modified polyol method accompanied with a salt-mediated self-assembly process in a water/ethylene glycol(EG)mixing *** formation mechanism of ptcu NWNs including the morphological evolution and the relevant experimental parameters has been investigated *** propose that a micro-interface in H2O-EG media formed with the assistance of disodium dihydrogen pyrophosphate(Na2H2P2O7)and its unique nature of coordinating with Pt^2+ or Cu^2+ play critical roles in the formation of *** tested as ORR catalyst,the ptcuNWNs/C exhibits much higher activity and durability than that of PtNWNs/C and commercial PtC,even exceeding the target of DOE in *** excellent performance of ptcuNWNs/C could be attributed to the unique structure of NWNs with 2.4 nm ultrathin wavy nanowires and plentiful surface defects and the modified electronic effect caused by alloying with Cu atoms.

关键词： ptcu nanoalloy nanowire networks surface defect self-assembly,oxygen reduction reaction

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