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Highly Dispersed Cobalt nanoparticles Embedded in Nitrogen-Doped Graphitized Carbon for Fast and Durable Potassium Storage

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Nano-Micro Letters 2021年第2期13卷 1-12页

作者： Xiaodong Shi Zhenming Xu Cheng Han Runze Shi Xianwen Wu Bingan Lu Jiang Zhou Shuquan Liang School of Materials Science and Engineering Central South UniversityChangsha 410083People’s Republic of China University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Harvard John.A.Paulson School of Engineering and Applied Sciences Harvard University29 Oxford StreetCambridgeMA 02138USA School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000People’s Republic of China School of Physics and Electronics State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082People’s Republic of China Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangsha 410083People’s Republic of China

Potassium-ion batteries(KIBs)have great potential for applications in large-scale energy storage devices.However,the larger radius of K+leads to sluggish kinetics and inferior cycling performance,severely restricting its practical applicability.Herein,we propose a rational strategy involving a Prussian blue analogue-derived graphitized carbon anode with fast and durable potassium storage capability,which is constructed by encapsulating Cobalt nanoparticles in nitrogen-doped graphitized carbon(Co-NC).Both experimental and theoretical results show that N-doping effectively promotes the uniform dispersion of Cobalt nanoparticles in the carbon matrix through Co-N bonds.Moreover,the Cobalt nanoparticles and strong Co-N bonds synergistically form a threedimensional conductive network,increase the number of adsorption sites,and reduce the diffusion energy barrier,thereby facilitating the adsorption and the diffusion kinetics.These multiple effects lead to enhanced reversible capacities of 305 and 208.6 mAh g^−1 after 100 and 300 cycles at 0.05 and 0.1 A g^−1,respectively,demonstrating the applicability of the Co-NC anode for KIBs.

关键词： Cobalt nanoparticles Nitrogen-doped graphitized carbon Co-N bonds Cycling stability Potassium-ion batteries

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Theoretical study on the morphology of Cobalt nanoparticles modulated by alkali metal promoters

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矿物冶金与材料学报:英文版 2023年第10期30卷 2006-2013页

作者： Xiaobin Geng Hui Yang Wenping Guo Xiaotong Liu Tao Yang Jinjia Liu National Energy Center for Coal to Liquids Synfuels China Co.LtdBeijing 101400China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China University of Chinese Academy of Sciences Beijing 100049China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Information Science and Technology UniversityBeijing 100101China School of Computer Beijing Information Science and Technology UniversityBeijing 100101China College of Chemistry and Environmental Science Inner Mongolia Key Laboratory of Green CatalysisInner Mongolia Normal UniversityHohhot 010022China

Cobalt nanoparticles(NPs)catalysts are extensively used in heterogeneous catalytic reactions,and the addition of alkali metal promoters is a common method to modulate the catalytic performance because the catalyst's surface structures and morphologies are sensitive to the addition of promoters.However,the underlying modulation trend remains unclear.Herein,the adsorption of alkali metal promoters(Na and K)on the surfaces of face-centered-cubic(FCC)and hexagonal-closest packed(HCP)polymorphous cobalt was systematically investigated using density functional theory.Furthermore,the effect of alkali promoters on surface energies and nanoparticle morphologies was revealed on the basis of Wulff theory.For FCC-Co,the exposed area of the(111)facet in the nanoparticle increases with the adsorption coverage of alkali metal oxide.Meanwhile,the(311),(110),and(100)facets would disappear under the higher adsorption coverage of alkali metals.For HCPCo,the Wulff morphology is dominated by the(0001)and(1011)facets and is independent of the alkali metal adsorption coverage.This work provides insights into morphology modulation by alkali metal promoters for the rational design and synthesis of cobalt-based nanomaterials with desired facets and morphologies.

关键词： Cobalt nanoparticles alkali promoter density functional theory crystal morphology Wulff construction

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In-situ exsolution of Cobalt nanoparticles from La_(0.5)Sr_(0.5)Fe_(0.8)Co_(0.2)O_(3-δ) cathode for enhanced CO_(2) electrolysis performance

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Green Chemical Engineering 2022年第3期3卷 250-258页

作者： Jingwei Li Qingxue Liu Yuefeng Song Houfu Lv Weicheng Feng Yuxiang Shen Chengzhi Guan Xiaomin Zhang Guoxiong Wang State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China University of Chinese Academy of Sciences Beijing100039China Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201800China

Solid oxide electrolysis cell(SOEC)is a promising technology for CO_(2) conversion and renewable energy storage with high efficiency.It is highly desirable to develop catalytically active cathodes for CO_(2) electrolysis.Herein,cathode materials with different structural stabilities are designed by Nb substitution on La_(0.5)Sr_(0.5)Fe_(0.8)Co_(0.2)O_(3-δ)(LSFC82)to obtain La_(0.5)Sr_(0.5)Fe_(0.7)Co_(0.2)Nb_(0.1)O_(3-δ)(LSFCN721)and La_(0.5)Sr_(0.5)Fe_(0.8)Co_(0.1)Nb_(0.1)O_(3-δ)(LSFCN811),respectively.LSFC82-Sm_(0.2)Ce_(0.8)O_(2-δ)(SDC)cathode with inferior structural stability(ability to maintain the structure)shows desirable CO_(2) electrolysis performance with the generated current density of 1.80 A cm^(-2)2 at 1.6 V and stable performance during 110 h operation at 1.2 V and 800℃.However,LSFC82 particles are collapsed into pieces after stability test with the generation of Co nanoparticles simultaneously.The frameworks of LSFCN721 and LSFCN811 particles maintain well because of the high-valent niobium,but Co exsolution,ox-ygen vacancy content and the corresponding CO_(2) electrolysis performance are restricted.This work confirms that Co nanoparticles can be exsolved from LSFC82-SDC cathode during CO_(2) electrolysis,providing references for constructing metallic nanoparticles decorated-perovskite cathodes for SOECs.

关键词： Solid oxide electrolysis cell CO_(2)electrolysis Perovskite Cobalt nanoparticles Exsolution

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Boosting the Rate Performance of Li–S Batteries via Highly Dispersed Cobalt nanoparticles Embedded into Nitrogen-Doped Hierarchical Porous Carbon

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CCS Chemistry 2022年第8期4卷 2829-2841页

作者： Cheng Yuan Pan Zeng Chen Cheng Tianran Yan Genlin Liu Wenmin Wang Jun Hu Xin Li Junfa Zhu Liang Zhang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123 Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026 National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026

Lithium–sulfur(Li–S)batteries are one of the most promising alternatives to lithium–ion batteries because of the advantageous high energy density and low cost.However,the practical applications of Li–S batteries are hampered by a severe shuttle effect and sluggish polysulfide redox conversion.Herein,highly dispersed Cobalt nanoparticles(∼0.8 wt%)embedded into nitrogen-doped hierarchical porous carbon(Co@N-HPC)are designed as an effective electrocatalyst for Li–S batteries,which exhibit a synergistic effect of anchoring and dual-directional catalytic conversion of polysulfides.

关键词： Li–S batteries functional separators Cobalt nanoparticles shuttleeffect polysulfideredoxconversion

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Hierarchically porous, ultrathin N–doped carbon nanosheets embedded with highly dispersed Cobalt nanoparticles as efficient sulfur host for stable lithium–sulfur batteries

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Journal of Energy Chemistry 2020年第11期29卷 106-114页

作者： Mengrui Wang Xunfu Zhou Xin Cai Hongqiang Wang Yueping Fang Xinhua Zhong College of Materials and Energy.South China Agricultural University Guangzhou 510642GuangdongChina Guangdong Laboratory for Lingnan Modem Agriculture South China Agricultural UniversityGuangzhou 510642GuangdongChina Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry&Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004GuangxiChina

The sluggish redox kinetics and shuttle effect of soluble polysulfides intermediate primarily restrict the electrochemical performance of lithium–sulfur(Li–S) batteries. To address this issue, rational design of high–efficiency sulfur host is increasingly demanded to accelerate the polysulfides conversion during charge/discharge process. Herein, we propose a macro–mesoporous sulfur host(Co@NC), which comprises highly dispersed Cobalt nanoparticles embedding in N–doped ultrathin carbon nanosheets. Co@NC is simply synthesized via a carbon nitride–derived pyrolysis approach. Owing to the highly conductive graphene–like matrix and well defined porous structure, the designed multifunctional Co@NC host enables rapid electron/ion transport, electrolyte penetration and effective sulfur trapping. More significantly,N heteroatoms and homogeneous Co nanocatalysts in the graphitic carbon nanosheets could serve as chemisorption sites as well as electrocatalytic centers for sulfur species. These Co–N active sites can synergistically facilitate the redox conversion kinetics and mitigate the shuttling of polysulfides, thus leading to improved electrochemical cycling performance of Li–S batteries. As a consequence, the S/Co@NC cathode demonstrates high initial specific capacity(1505 mA h g-1 at 0.1 C) and excellent cycling stability at 1 C over 300 cycles, giving rise to a capacity retention of 91.7% and an average capacity decline of 0.03%cycle-1.

关键词： Rechargeable lithium–sulfur batteries Sulfur host Shuttling effect Carbon nanosheets Cobalt nanoparticles Carbon nitride

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Nitrogen-doped Cobalt nanoparticles/nitrogen-doped plate-like ordered mesoporous carbons composites as noble-metal free electrocatalysts for oxygen reduction reaction

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Journal of Energy Chemistry 2017年第1期26卷 63-71页

作者： Vincent Mirai Bau Xiangjie Bo Liping Guo Faculty of Chemistry Northeast Normal UniversityChangchun 130024JilinChina

In this work, nitrogen-doped Cobalt nanoparticlesinitrogen-doped plate-like ordered mesoporous carbons (N/Co/OMCs) were used as noble-metal free electrocatalysts with high catalytic efficiency. Compared with OMCs with long channel length, due to more entrances for catalytic target accessibility and a short pathway for rapid diffusion, the utilization efficiency of Cobalt nanoparticles inside the plate-like OMCs with short pore length is well improved, which can take full advantage of porous structure in electrocatalysis and increase the utilization of catalysts. The active sites in N/Co/OMCs for oxygen reduction reaction (ORR) are highly exposed to oxygen molecule, which results in a high activity for ORR. By combination of the catalytic properties of nitrogen dopant, incorporation of Co nanoparticles, and structural properties of OMCs, the N/Co/plate-like OMCs are highly active noble-metal free catalysts for ORR in alkaline solution. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Ordered mesoporous carbons Nitrogen doping Cobalt nanoparticles Oxygen reduction reaction

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Carbon nanotubes decorated α-Al_2O_3 containing Cobalt nanoparticles for Fischer-Tropsch reaction

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Journal of Energy Chemistry 2013年第2期22卷 279-289页

作者： Yuefeng Liu Thierry Dintzer Ovidiu Ersen Cuong Pham-Huu Laboratoire des Matriaux Surfaces et Procds pour la Catalyse (LMSPC) UMR 7515 CNRS-Universit de Strasbourg (UdS) 25 rue Becquerel 67087 Strasbourg Cedex 08 France Institut de Physique et Chimie des Matriaux de Strasbourg (IPCMS) UMR 7504 CNRS-Universit de Strasbourg (UdS) 23 rue du Loess 67037 Strasbourg Cedex 02 France

A new hierarchical composite consisted of multi-walled carbon nanotubes （CNTs） layer anchored on macroscopic a-A1203 host matrix was synthesized and used as support for Fischer-Tropsch synthesis （FTS）. The composite constituted by a thin shell of a homogeneous, highly entan-gled and structure-opened carbon nanotubes network and it exhibited a relatively high and fully accessible specific surface area of 76 m2.g-1, compared with that of 5 m2.g-1 of the original a-A1203support. The metal-support interaction between carbon nanotubes surface and cobalt precursor and high effective surface area led to a relatively high dispersion of Cobalt nanoparticles. This hierarchically supported cobalt catalyst exhibited a high FTS activity along with an extremely high selectivity towards liquid hydrocarbons compared with the cobalt-based catalyst supported on pristine a-A1203 or on CNTs carriers. This improvement can attribute to the high accessibility of composite surface area com- paring with the macroscopic host structure alone or to the bulk CNTs where the nanoscopic dimension induced a dense packing with low mass transfer which favoured the problem of reactants competitive diffusion towards the cobalt active site. In addition, intrinsic thermal conductivity of decorated CNTs could help the heat dissipating throughout the catalyst body, thus avoiding the formation of local hot spots which appeared in high CO conversion under pure syngas feed in FTS reaction. cobalt supported on CNTs decorated a-A1203 catalyst also exhibited satisfied high stability during more than 200 h on stream under relatively severe conditions compared with other catalysts reported in the literature. Finally, the macroscopic shape of such composite easily rendered its usage as catalyst support in a fixed-bed configuration without facing problems of transport and pressure drop as encountered with the bulk CNTs.

关键词： carbon nanotubes Fischer-Tropsch synthesis a-A1203 hierarchical support Cobalt nanoparticles

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A host-guest approach to fabricate metallic Cobalt nanoparticles embedded in silk-derived N-doped carbon fibers for efficient hydrogen evolution

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Green Energy & Environment 2017年第2期2卷 151-159页

作者： Fenglei Lyu Qingfa Wang Han Zhu Mingliang Du Li Wang Xiangwen Zhang Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and Technology Tianjin University Department of Materials Engineering College of Materials and Textiles Zhejiang Sci-Tech University

Hydrogen evolution reaction(HER) plays a key role in generating clean and renewable energy. As the most effective HER electrocatalysts, Pt group catalysts suffer from severe problems such as high price and scarcity. It is highly desirable to design and synthesize sustainable HER electrocatalysts to replace the Pt group catalysts. Due to their low cost, high abundance and high activities, cobalt-incorporated N-doped nanocarbon hybrids are promising candidate electrocatalysts for HER. In this report, we demonstrated a robust and eco-friendly host-guest approach to fabricate metallic Cobalt nanoparticles embedded in N-doped carbon fibers derived from natural silk fibers. Benefiting from the onedimensional nanostructure, the well-dispersed metallic Cobalt nanoparticles and the N-doped thin graphitized carbon layer coating, the best Cobased electrocatalyst manifests low overpotential(61 mV@10 mA/cm^2) HER activity that is comparable with commercial 20% Pt/C, and good stability in acid. Our findings provide a novel and unique route to explore high-performance noble-metal-free HER electrocatalysts.

关键词： Silk Carbon fibers Cobalt nanoparticles Hydrogen evolution Nitrogen doping

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Synthesis and surface modification of Cobalt nanoparticles and electromagnetic property of Co/PPy nanocomposites

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Rare Metals 2015年第4期34卷 223-228页

作者： Hai-Cheng Wang Zhi-Ran Yan Ling Deng Hua Dong Yi-He Jia Ning Ma Jun He Guang-Hua Yu School of Materials Science and Engineering University of Science and Technology Beijing Institute of Functional Materials Central Iron & Steel Research Institute

In this work, Cobalt nanoparticles were syn- thesized by chemical reduction procedure. After the hydrophilic functionalization, Co/polypyrrole （PPy） nanocomposites were prepared by in situ polymerization of pyrrole in aqueous dispersion of Co nanoparticles. The Co/ PPy nanocomposites show good electromagnetic properties with both magnetic loss and dielectric loss to electromag- netic wave. The electromagnetic wave absorbing band- width （reflection loss 〈-10 dB） for Co/PPy （20 wt%） is above 5.5 GHz at a thickness of 2 mm, and with a maximum reflection loss （around -20.02 dB） at 14.77 GHz. This magnetic nanoparticles/conducting polymer nanocomposites are great potential candidates for electromagnetic wave absorbent, because of their wide-absorbing frequency, strong absorption, good compatibility, low density, and controllable absorbing properties.

关键词： Cobalt nanoparticles Synthesis Surface modification Nanocomposites Electromagnetic property

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N-doped graphitic carbon encapsulating Cobalt nanoparticles derived from novel metal–organic frameworks for electrocatalytic oxygen evolution reaction

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中国化学快报:英文版 2023年第8期34卷 472-477页

作者： Yuanmeng Tian Hao Wu Aamir Hanif Yanli Niu Ying Yin Yangyi Gu Zuofeng Chen Qinfen Gu Yun Hau Ng Jin Shang Liangchun Li Mingxian Liu Shanghai Key Lab of Chemical Assessment and Sustainability School of Chemical Science and EngineeringTongji UniversityShanghai 200092China School of Energy and Environment City University of Hong KongHong Kong SAR 999077China City University of Hong Kong Shenzhen Research Institute Shenzhen 518000China Macao Institute of Materials Science and Engineering Faculty of Innovation EngineeringMacao University of Science and TechnologyMacao SAR 999078China Australian Synchrotron(ANSTO) Victoria 3168Australia

Nitrogen-doped carbon catalysts with hierarchical porous structure are promising oxygen evolution reaction(OER)catalysts due to the faster mass transfer and better charge carrying ability.Herein,an exquisite high nitrogen-containing ligand was designed and readily synthesized from the low-cost biomolecule adenine.Accordingly,three new MOFs(TJU-103,TJU-104 and TJU-105)were prepared using the Co(II)or Mn(II)ions as metal nodes.Through rationally controlling pyrolysis condition,in virtue of the high nitrogen content in well-defined periodic structure of the pristine MOFs,TJU-104–900 among the derived MOFs with hierarchical porous structure,i.e.,N-doped graphitic carbon encapsulating homogeneously distributed Cobalt nanoparticles,could be conveniently obtained.Thanks to the synergistic effect of the hierarchical structure and well dispersed active components(i.e.,C=O,Co–Nx,graphitic C and N,pyridinic N),it could exhibit an overpotential of 280 mV@10mA/cm^(2)on carbon cloth for OER activity.This work provides the inspiration for fabrication of nitrogen-doped carbon/metal electrocatalysts from cost-effective and abundant biomolecules,which is promising for practical OER application.

关键词： Metal-organic frameworks Oxygen evolution reaction High nitrogen content Cobalt nanoparticles Hierarchical structure

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