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RuO_(2)-PdO nanowire networks with rich interfaces and defects supported on carbon toward the efficient alkaline hydrogen oxidation reaction

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能源化学:英文版 2023年第8期83卷 255-263,I0008页

作者： Yuanyuan Cong Fanchao Meng Haibin Wang Di Dou Qiuping Zhao Chunlei Li Ningshuang Zhang Junying Tian School of Petrochemical Technology Lanzhou University of TechnologyLanzhou 730050GansuChina Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province Lanzhou University of TechnologyLanzhou 730050GansuChina

Interfacial engineering is a promising approach for enhancing electrochemical performance,but rich and efficient interfacial active sites remain a challenge in fabrication.Herein,RuO_(2)-PdO heterostructure nanowire networks(NWs) with rich interfaces and defects supported on carbon(RuO_(2)-PdO NWs/C) for alkaline hydrogen oxidation reaction(HOR) was formed by a seed induction-oriented attachment-thermal treatment method for the first time.As expected,the RuO_(2)-PdO NWs/C(72.8% Ru atomic content in metal) exhibits an excellent activity in alkaline HOR with a mass specific exchange current density(jo,m) of 1061 A gRuPd-1,which is 3.1 times of commercial Pt/C and better than most of the reported nonPt noble metal HOR electrocatalysts.Even at the high potential(~0.5 V vs.RHE) or the presence of CO(5 vol%),the RuO_(2)-PdO NWs/C still effectively catalyzes the alkaline HOR.Structure/electrochemical analysis and theoretical calculations reveal that the interfaces between RuO_(2) and PdO act as the active sites.The electronic interactions between the two species and the rich defects for the interfacial active sites weaken the adsorption of Had,also strengthen the adsorption of OHad,and accelerate the alkaline HOR process.Moreover,OHadon RuO_(2) can spillover to the interfaces,keeping the RuO_(2)-PdO NWs/C with the stable current density at higher potential and high resistance to CO poisoning.

关键词： Hydrogen oxidation reaction Heterostructure nanowire networks Defects Interfacial active sites

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In-materio reservoir computing based on nanowire networks:fundamental,progress,and perspective

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Materials Futures 2023年第2期2卷 79-93页

作者： Renrui Fang Woyu Zhang Kuan Ren Peiwen Zhang Xiaoxin Xu Zhongrui Wang Dashan Shang State Key Laboratory of Fabrication Technologies for Integrated Circuits Institute of Microelectronics of Chinese Academy of SciencesBeijing 100029People’s Republic of China Department of Electrical and Electronic Engineering The University of Hong KongHong Kong 999077People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China

The reservoir computing(RC)system,known for its ability to seamlessly integrate memory and computing functions,is considered as a promising solution to meet the high demands for time and energy-efficient computing in the current big data landscape,compared with traditional silicon-based computing systems that have a noticeable disadvantage of separate storage and computation.This review focuses on in-materio RC based on nanowire networks(NWs)from the perspective of materials,extending to reservoir devices and applications.The common methods used in preparing nanowires-based reservoirs,including the synthesis of nanowires and the construction of networks,are firstly systematically summarized.The physical principles of memristive and memcapacitive junctions are then explained.Afterwards,the dynamic characteristics of nanowires-based reservoirs and their computing capability,as well as the neuromorphic applications of NWs-based RC systems in recognition,classification,and forecasting tasks,are explicated in detail.Lastly,the current challenges and future opportunities facing NWs-based RC are highlighted,aiming to provide guidance for further research.

关键词： reservoir computing nanowire networks short-term memory dynamic characteristics neuromorphic computing

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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 challenge.Herein,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 media.The formation mechanism of PtCu NWNs including the morphological evolution and the relevant experimental parameters has been investigated systematically.We 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 NWNs.When 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 2020.The 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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Facile fabrication of PdRuPt nanowire networks with tunable compositions as efficient methanol electrooxidation catalysts

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Nano Research 2018年第8期11卷 4348-4355页

作者： Changshuai Shang Yaxiao Guo Erkang Wang State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun 130022 China University of Chinese Academy of Sciences Beijing 100049 China

The preparation of nanomaterials with superior catalytic properties through simple and rapid protocols is a task of great importance. In the present study, we demonstrate the direct synthesis of trimetaUic PdRuPt nanowire networks through the reduction of the corresponding metal precursors with NaBH4, in the presence of KBr and polyvinylpyrrolidone （PV-P）. The elemental composition of the final products could be easily tuned by varying the added amounts of metal precursors. The obtained nanomaterials were then used as catalysts for methanol electrooxidation in an acidic medium. Among the synthesized PdRuPt and PtPd nanowire networks, Pd0.97Ru0.44Pt exhibits the highest catalytic activity and durabili~ along with a specific activity 3.5 times higher than that of commercial Pt/C. The enhanced catalytic properties of the present nanowire systems are attributed to their unique structures and the introduction of Ru into PtPd nanocrystals with outstanding properties.The preparation of nanomaterials with superior catalytic properties through simple and rapid protocols is a task of great importance. In the present study, we demonstrate the direct synthesis of trimetaUic PdRuPt nanowire networks through the reduction of the corresponding metal precursors with NaBH4, in the presence of KBr and polyvinylpyrrolidone （PV-P）. The elemental composition of the final products could be easily tuned by varying the added amounts of metal precursors. The obtained nanomaterials were then used as catalysts for methanol electrooxidation in an acidic medium. Among the synthesized PdRuPt and PtPd nanowire networks, Pd0.97Ru0.44Pt exhibits the highest catalytic activity and durability along with a specific activity 3.5 times higher than that of commercial Pt/C. The enhanced catalytic properties of the present nanowire systems are attributed to their unique structures and the introduction of Ru into PtPd nanocrystals with outstanding properties.

关键词： palladium ruthenium platinum nanowire networks methanol electrooxidation

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