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Nano-Micro Letters 2019年第1期11卷 64-77页

作者： Qi Shao Jiaqi Liu Qiong Wu Qiang Li Heng?guo Wang Yanhui Li Qian Duan School of Materials Science and Engineering Changchun University of Science and Technology

An in situ coupling strategy to prepare Co_9S_8/S and N dual?doped graphene composite(Co_9S_8/NSG) has been proposed. The key point of this strategy is the function?oriented design of organic compounds. Herein, cobalt porphyrin derivatives with sulfo groups are employed as not only the coupling agents to form and anchor Co_9S_8 on the graphene in situ, but also the heteroatom?doped agent to generate S and N dual?doped graphene. The tight coupling of multiple active sites endows the composite materials with fast electrochemical kinetics and excellent stability for both oxygen reduction reaction(ORR) and oxygen evolution reaction(OER). The obtained electrocatalyst exhibits better activity parameter(ΔE = 0.82 V) and smaller Tafel slope(47.7 mV dec^(-1) for ORR and 69.2 mV dec^(-1) for OER) than commercially available Pt/C and RuO_2. Most importantly, as electrocatalyst for rechargeable zn–air battery, Co_9S_8/NSG displays low charge–discharge voltage gap and outstanding long?term cycle stability over 138 h compared to Pt/C–RuO_2. To further broaden its application scope, a homemade all?solid?state zn–air battery is also prepared, which displays good charge–discharge performance and cycle performance. The function?oriented design of N_4?metallomacrocycle derivatives might open new avenues to strategic construction of high?performance and long?life multifunctional electrocatalysts for wider electro?chemical energy applications.

关键词： In situ coupling strategy Porphyrin derivate Doped graphene Metal sulfide Bifunctional electrocatalyst Rechargeable zn–air battery

Bifunctional Oxygen Electrocatalyst of Mesoporous Ni/NiO Nanosheets for Flexible Rechargeable zn–air Batteries

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Nano-Micro Letters 2020年第5期12卷 165-176页

作者： Peitao Liu Jiaqi Ran Baorui Xia Shibo Xi Daqiang Gao John Wang Key Laboratory for Magnetism and Magnetic Materials of MOE Key Laboratory of Special Function Materials and Structure Design of MOELanzhou UniversityLanzhou 730000People’s Republic of China Institute of Chemical and Engineering Sciences A*STAR1 Pesek RoadJurong Island 627833Singapore Department of Material Science and Engineering National University of SingaporeEngineering Drive 3Singapore 117575Singapore

One approach to accelerate the stagnant kinetics of both the oxygen reduction and evolution reactions(ORR/OER)is to develop a rationally designed multiphase nanocomposite,where the functions arising from each of the constituent phases,their interfaces,and the overall structure are properly ***,we successfully synthesized an oxygen electrocatalyst consisting of Ni nanoparticles purposely interpenetrated into mesoporous NiO nanosheets(porous Ni/NiO).Benefiting from the contributions of the Ni and NiO phases,the well-established pore channels for charge transport at the interface between the phases,and the enhanced conductivity due to oxygen-deficiency at the pore edges,the porous Ni/NiO nanosheets show a potential of 1.49 V(10 mA cm^-2)for the OER and a half-wave potential of 0.76 V for the ORR,outperforming their noble metal *** significantly,a zn-air battery employing the porous Ni/NiO nanosheets exhibits an initial charging-discharging voltage gap of 0.83 V(2 mA cm^-2),specific capacity of 853 mAh gzn^-1 at 20 mA cm^-2,and long-time cycling stability(120 h).In addition,the porous Ni/NiO-based solid-like zn-air battery shows excellent electrochemical performance and flexibility,illustrating its great potential as a next-generation rechargeable power source for flexible electronics.

关键词： Porous Ni/NiO Oxygen reduction reaction Oxygen evolution reaction Electrocatalysis Flexible zn–air battery

Flexible, Porous, and Metal–Heteroatom?Doped Carbon Nanofibers as Efficient ORR Electrocatalysts for zn–air Battery

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Nano-Micro Letters 2019年第1期11卷 147-163页

作者： Qijian Niu Binling Chen Junxia Guo Jun Nie Xindong Guo Guiping Ma Key Laboratory of carbon Fiber and Functional Polymers Ministry of Education Beijing University of Chemical Technology State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology College of Engineering Mathematics and Physical Sciences University of Exeter

Developing an e cient and durable oxygen reduction electrocatalyst is critical for clean-energy technology, such as fuel cells and metal–air batteries. In this study, we developed a facile strategy for the preparation of flexible, porous, and well-dispersed metal–heteroatom-doped carbon nanofibers by direct carbonization of electrospun zn/Co-ZIFs/PAN nanofibers(zn/Co-ZIFs/PAN). The obtained zn/Co and N co-doped porous carbon nanofibers carbonized at 800 °C(zn/Co–N@PCNFs-800) presented a good flexibility, a continuous porous structure, and a superior oxygen reduction reaction(ORR) catalytic activity to that of commercial 20 wt% Pt/C, in terms of its onset potential(0.98 V vs. RHE), half-wave potential(0.89 V vs. RHE), and limiting current density(-5.26 mA cm^(-2)). In addition, we tested the suitability and durability of zn/Co–N@PCNFs-800 as the oxygen cathode for a rechargeable zn–air battery. The prepared zn–air batteries exhibited a higher power density(83.5 mW cm^(-2)), a higher specific capacity(640.3 mAh g^(-1)), an excellent reversibility, and a better cycling life than the commercial 20 wt% Pt/C + RuO_2 catalysts. This design strategy of flexible porous non-precious metal-doped ORR electrocatalysts obtained from electrospun ZIFs/polymer nanofibers could be extended to fabricate other novel, stable, and easy-to-use multi-functional electrocatalysts for clean-energy technology.

关键词： Electrospinning zn/Co-ZIFs Carbon nanofibers Flexible porous structure ORR zn–air battery

Mesoporous Ternary Nitrides of Earth?Abundant Metals as Oxygen Evolution Electrocatalyst

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Nano-Micro Letters 2020年第6期12卷 190-202页

作者： Ali Saad Hangjia Shen Zhixing Cheng Ramis Arbi Beibei Guo Lok Shu Hui Kunyu Liang Siqi Liu John Paul Attfield Ayse Turak Jiacheng Wang Minghui Yang Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201Zhejiang ProvincePeople’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Department of Engineering Physics McMaster UniversityHamilton L8S 4L7Canada State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of Sciences1295 Dingxi RoadShanghai 200050People’s Republic of China Centre for Science at Extreme Conditions and EaStCHEM School of Chemistry University of EdinburghKings BuildingsWest Mains RoadEdinburgh EH93JJUK

As sustainable energy becomes a major concern for modern society,renewable and clean energy systems need highly active,stable,and low-cost catalysts for the oxygen evolution reaction(OER).Mesoporous materials offer an attractive route for generating efficient electrocatalysts with high mass transport ***,we report an efficient hard templating pathway to design and synthesize three-dimensional(3-D)mesoporous ternary nickel iron nitride(Ni3FeN).The as-synthesized electrocatalyst shows good OER performance in an alkaline solution with low overpotential(259 mV)and a small Tafel slope(54 mV dec?1),giving superior performance to IrO2 and RuO2 *** highly active contact area,the hierarchical porosity,and the synergistic effect of bimetal atoms contributed to the improved electrocatalytic performance toward *** a practical rechargeable zn–air battery,mesoporous Ni3FeN is also shown to deliver a lower charging voltage and longer lifetime than *** work opens up a new promising approach to synthesize active OER electrocatalysts for energy-related devices.

关键词： Ordered mesoporous structure Hard template Ni3FeN Oxygen evolution reaction zn–air battery