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Facile Synthesis of N-Doped graphene-like Carbon Nanoflakes as Efficient and Stable Electrocatalysts for the Oxygen Reduction Reaction

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Nano-Micro Letters 2018年第2期10卷 114-125页

作者： Daguo Gu Yao Zhou Ruguang Ma Fangfang Wang Qian Liu Jiacheng Wang School of Materials Engineering Yancheng Institute of Technology State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of Sciences Shanghai Institute of Materials Genome

A series of N-doped carbon materials(NCs)were synthesized by using biomass citric acid and dicyandiamide as renewable raw materials via a facile onestep pyrolysis method. The characterization of microstructural features shows that the NCs samples are composed of few-layered graphene-like nanoflakes with controlled in situ N doping, which is attributed to the confined pyrolysis of citric acid within the interlayers of the dicyandiamide-derived g-C_3N_4 with high nitrogen contents. Evidently, the pore volumes of the NCs increased with the increasing content of dicyandiamide in the precursor. Among these samples, the NCs nanoflakes prepared with the citric acid/dicyandiamide mass ratio of 1:6, NC-6,show the highest N content of ~6.2 at%, in which pyridinic and graphitic N groups are predominant. Compared to the commercial Pt/C catalyst, the as-prepared NC-6 exhibits a small negative shift of ~66 mV at the half-wave potential, demonstrating excellent electrocatalytic activity in the oxygen reduction reaction. Moreover, NC-6 also shows better long-term stability and resistance to methanol crossover compared to Pt/C. The efficient and stable performance are attributed to the graphene-like microstructure and high content of pyridinic and graphitic doped nitrogen in the sample, which creates more active sites as well as facilitating charge transfer due to the close four-electron reaction pathway. The superior electrocatalytic activity coupled with the facile synthetic method presents a new pathway to cost-effective electrocatalysts for practical fuel cells or metal–air batteries.

关键词： Nitrogen doping graphene-like Carbon nanoflakes Electrocatalyst Oxygen reduction reaction

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Analysis of graphene-like activated carbon derived from rice straw for application in supercapacitor

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Chinese Chemical Letters 2017年第12期28卷 2290-2294页

作者： Kevin Monthiego Horax Shujuan Bao Minqiang Wang Yanan Li Institute for Clean Energy&Advanced Materials Faculty of Materials EnergySouthwest UniversityChongqing 400715China

Activated carbons with large surface area, abundant microporosity and low cost are the most commonly used electrode materials for energy storage devices. However, activated carbons are conventionally made from fossil precursors, such as coal and petroleum, which are limited resources and easily aggregate large block in high temperature carbonization processes. In this novel work, we examined the use of rice straw as a potential alternative carbon source precursor for the production of graphene-like active carbon. A very slack activated carbon with ultra-thin two-dimensional （2D） layer structure was prepared by our proposed approach in this work, which includes a pre-treatment process and potassium hydroxide activation at high temperatures. The obtained active carbon derived from rice straw exhibited a capacitance of 255 Fig at 0.5 A/g, excellent rate capability, and long cycling capability （98% after 10,000 cycles）.

关键词： Rice straw graphene-like Activated carbon Supercapacitor 2D-layer

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Co/N co-doped graphene-like nanocarbon for highly efficient oxygen reduction electrocatalyst

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Science China Materials 2019年第3期62卷 359-367页

作者： Lei Liu Jian Zhang Wujun Ma Yunhui Huang School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore School of Chemistry Biology and Materials EngineeringSuzhou University of Science and TechnologySuzhou 215009China

The development of efficient and inexpensive graphene-based electrocatalysts is of great significance to promote the commercial application of fuel cell and metal-air batteries. In this paper, a new type of Co and N co-doped graphene-like nanocarbon(Co/N-GLC) material was prepared by nano-silicon protection and high temperature *** obtained Co/N-GLC catalyst not only has a similar morphology of graphene, but also possesses a high specific surface area(809 m2 g-1) with hierarchical porous structure(micropores/mesopores), and relative high active dopants *** properties endow it with a good oxygen reduction activity in alkaline media, which can be comparable to commercial Pt/C catalyst. Moreover, the assembled zinc-air batteries using Co/N-GLC catalyst as the air electrode display a better discharge performance and higher stability compared to that of Pt/C electrode. This work demonstrates that the prepared graphene-like carbon catalyst has a good prospect,which can replace noble metal catalyst at the cathode in metalair batteries.

关键词： graphene-like nanocarbon oxygen reduction reaction electrocatalyst zinc-air battery

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Enhancing kinetics of Li-S batteries by graphene-like N,S-codoped biochar fabricated in NaCl non-aqueous ionic liquid

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Science China Materials 2019年第4期62卷 455-464页

作者： Man Huang Jingyu Yang Baojuan Xi Kan Mi Zhenyu Feng Jing Liu Jinkui Feng Yitai Qian Shenglin Xiong Key Laboratory of the Colloid and Interface Chemistry Ministry of Education and School of Chemistry and Chemical Engineering Shandong University College of Materials Science and Engineering Qingdao University of Science and Technology Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials(Ministry of Education) School of Materials Science and Engineering Shandong University Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China

graphene-like N,S-codoped bio-carbon nanosheets(GNSCS) were prepared by a facile and environment-friendly NaCl non-aqueous ionic liquid route to house sulfur for lithium-sulfur battery. The natural nori powder was calcined at 900°C for 3 h under Ar, in which NaCl non-aqueous ionic liquid can exfoliate carbon aggregates into nanosheets. The structural characterization of GNSCS by a series of techniques demonstrates the graphene-like *** evaluated as the matrix for sulfur cathode, GNSCS/S exhibits more prominent cycling stability and rate capability.A discharge capacity of 548 mA h g-1 at a current density of 1.6 A g-1 after 400 cycles was delivered with a capacity fade rate of only 0.13% per cycle and an initial Coulombic efficiency(CE) as high as 99.7%. When increasing the areal sulfur loading up to 3 mg cm-2, the discharge capacity can still be retained at 647 mA h g-1 after more than 100 cycles with a low capacity degradation of only ~0.30% per cycle. The features of N/S dual-doping and the graphene-like structure are propitious to the electron transportation, lithium-ion diffusion and more active sites for chemically adsorbing polysulfides. It is anticipated that other functional biochar carbon can also be attained via the low-cost, sustainable and green method.

关键词： nori powder graphene-like N S-codoped bio-carbon nanosheets NaCl non-aqueous ionic liquid reaction kinetics lithium-sulfur batteries

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Controlled growth of uniform two-dimensional ZnO overlayers on Au(111)and surface hydroxylation

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Nano Research 2019年第9期12卷 2348-2354页

作者： Hao Wu Qiang Fu Yifan Li Yi Cui Rui Wang Nan Su Le Lin Aiyi Dong Yanxiao Ning Fan Yang Xinhe Bao State Key Lab of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Department of Chemical Physics University of Science and Technology of ChinaHefei 2300263China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Ultrathin ZnO nano structures prese nt in teresti ng two-dimensi on al(2D)graphene-like structure in contrast to wurtzite structure in bulk *** on Au(111)has been regarded as a well-established route to the 2D ZnO layers while controlled growth of uniform ZnO nano structures remains as a challe ***,reactive deposition of Zn in O3 and NO2 was employed,which is investigated by sea nning tunneling microscopy and X-ray photoelectr on spectroscopy(XPS).We dem on strate that uniform ZnO mono layer nanoislands and films can be obtained on Au(111)using O3 and uniform ZnO bilayer nanoislands and films form on Au(111)using NO2,*** of atomic oxyge n overlayers on Au(111)via exposure to O3 is critical to the formatio n of uniform ZnO mono layer nano structures *** ambient pressure XPS studies revealed that n early full hydroxy lati on occurs on mono layer ZnO structures upon exposure to near ambient pressure water vapor or atomic hydrogen species,while partial surface hydroxylation happens on bilayer ZnO under the same gaseous exposure conditions.

关键词： graphene-like ZnO two-dimensional materials hydroxylation near ambient pressure X-ray photoelectron spectroscopy(NAP-XPS) seanning tunneling microscopy(STM)

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Porous Carbon Grown by Chemical Vapor Deposition on Copper Substrates

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Journal of Materials Science and Chemical Engineering 2015年第8期3卷 16-20页

作者： D. Mendoza Instituto de Investigaciones en Materiales Universidad Nacional Autónoma de México México D. F. México

Amorphous porous carbon was synthesized by chemical vapor deposition on copper substrates. The average size of the pores is around 1.2 microns with some small pores decorating the big ones. Lamellar samples of this carbonaceous material can be separated from the copper support and may be useful as electrode due to its low electrical resistivity of the order of 0.4 Ωcm.

关键词： Porous Carbon graphene-like Materials Conductive Electrodes Chemical Vapor Deposition

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