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Recent advances and influencing parameters in developing electrode materials for symmetrical solid oxide fuel cells

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矿物冶金与材料学报:英文版 2023年第10期30卷 1933-1956页

作者： Wan Nor Anasuhah Wan Yusoff Nurul Akidah Baharuddin Mahendra Rao Somalu Andanastuti Muchtar nigel p.brandon Huiqing Fan Solid Oxide Fuel Cell Group Fuel Cell InstituteUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Department of Mechanical and Manufacturing Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Faculty of Engineering 2.06 Faculty BuildingImperial College LondonSW72 AZUK State Key Laboratory of Solidification processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

This article delivers a robust overview of potential electrode materials for use in symmetrical solid oxide fuel cells(S-SOFCs),a relatively new SOFC technology.To this end,this article provides a comprehensive review of recent advances and progress in electrode materials for S-SOFC,discussing both the selection of materials and the challenges that come with making that choice.This article discussed the relevant factors involved in developing electrodes with nano/microstructure.Nanocomposites,e.g.,non-cobalt and lithiated materials,are only a few of the electrode types now being researched.Furthermore,the phase structure and microstructure of the produced materials are heavily influenced by the synthesis procedure.Insights into the possibilities and difficulties of the material are discussed.To achieve the desired microstructural features,this article focuses on a synthesis technique that is either the most recent or a better iteration of an existing process.The portion of this analysis that addresses the risks associated with manufacturing and the challenges posed by materials when fabricating S-SOFCs is the most critical.This article also provides important and useful recommendations for the strategic design of electrode materials researchers.

关键词： nano composites electrode microstructure tailoring oxidation symmetrical solid oxide fuel cell

Highly Aligned Ultra-Thick Gel-Based Cathodes Unlocking Ultra-High Energy Density Batteries

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Energy & Environmental Materials 2022年第4期5卷 1332-1339页

作者： Shichun Yang Chaochao Zhou Qiong Wang Binbin Chen Yan Zhao Bin Guo Zhengjie Zhang Xinlei Gao Ridwanur Chowdhury Huizhi Wang Chao Lai nigel p.brandon Billy Wu Xinhua Liu School of Transportation Science and Engineering Beihang UniversityBeijing 100191China School of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou 221116China Imperial College London Sough Kensington CampusLondon SW72AZUK

Increasing electrode thickness can substantially enhance the specific energy of lithium-ion batteries;however,ionic transport,electronic conductivity,and ink rheology are current barriers to adoption.Here,a novel approach using a mixed xanthan gum and locust bean gum binder to construct ultrathick electrodes is proposed to address above issues.After combining aqueous binder with single-walled carbon nanotubes(SWCNT),active material(LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)) and subsequent vacuum freeze-drying,highly aligned,and low-tortuosity structures with a porosity of ca.50%can be achieved with an average pore size of 10μm,whereby the gum binder-SWCNT-NMC811 forms vertical structures supported by tissue-like binder/SWCNT networks allowing for excellent electronic conducting phase percolation.As a result,ultra-thick electrodes with a mass loading of about 511 mg cm^(−2) and 99.5 wt%active materials have been demonstrated with a remarkable areal capacity of 79.3 mAh cm^(−2),which is the highest value reported so far.This represents a>25×improvement compared with conventional electrodes with an areal capacity of about 3 mAh cm^(−2).This route also can be expanded to other electrode materials,such as LiFepO_(4) and Li_(4)Ti_(5)O_(12),and thus opens the possibility for low-cost and sustainable ultra-thick electrodes with increased specific energy for future lithium-ion batteries.

关键词： binder gel-based cathodes high areal capacity lithium-ion battery ultrathick electrodes

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氢能源助力实现零碳排放的世界（英文）

Engineering 2023年第10期 8-10页

作者： nigel p.brandon James J.brandon Faculty of Engineering Imperial College London South Kensington Campus The First Element Ltd.

1. Why hydrogen?The concept of the “hydrogen economy” was first coined by prof. John Bockris during a talk he gave in 1970 at the General Motors Technical Center. Bockris’s talk introduced the vision of a world economy in which energy was carried in the form of hydrogen, resulting in zero emissions at its point of use-be that as a chemical feedstock or as a fuel for industrial or domestic heating,for power generation in a gas turbine, or in a fuel cell “engine” for transport applications.

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pores for thought:generative adversarial networks for stochastic reconstruction of 3D multi-phase electrode microstructures with periodic boundaries

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npj Computational Materials 2020年第1期6卷 971-981页

作者： Andrea Gayon-Lombardo Lukas Mosser nigel p.brandon Samuel J.Cooper Department of Earth Science and Engineering Imperial College LondonLondon SW72BPUK Earth Science Analytics ASA Professor Olav Hanssens vei 7AStavanger 4021Norge Dyson School of Design Engineering Imperial College LondonLondon SW72DBUK

The generation of multiphase porous electrode microstructures is a critical step in the optimisation of electrochemical energy storage devices.This work implements a deep convolutional generative adversarial network(DC-GAN)for generating realistic nphase microstructural data.The same network architecture is successfully applied to two very different three-phase microstructures:A lithium-ion battery cathode and a solid oxide fuel cell anode.A comparison between the real and synthetic data is performed in terms of the morphological properties(volume fraction,specific surface area,triple-phase boundary)and transport properties(relative diffusivity),as well as the two-point correlation function.The results show excellent agreement between datasets and they are also visually indistinguishable.By modifying the input to the generator,we show that it is possible to generate microstructure with periodic boundaries in all three directions.This has the potential to significantly reduce the simulated volume required to be considered“representative”and therefore massively reduce the computational cost of the electrochemical simulations necessary to predict the performance of a particular microstructure during optimisation.

关键词： microstructure electrode phase

Model-guided design of a high performance and durability Ni nanofiber/ceria matrix solid oxide fuel cell electrode

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Journal of Energy Chemistry 2021年第5期30卷 98-112页

作者： Mengzheng Ouyang Antonio Bertei Samuel J.Cooper Yufei Wu paul Boldrin Xinhua Liu Masashi Kishimoto Huizhi Wang Max Naylor Marlow Jingyi Chen Xiaolong Chen Yuhua Xia Billy Wu nigel p.brandon Department of Earth Science and Engineering Imperial College LondonExhibicion RoadLondon SW72AZUnired Kingdom Department of Civil and Industrial Engineering(D1CI) University of PisaLargo Lucio Lazzarino256J22 PisaItaly Dyson School of Design Engineering Imperial College LondonExhibition RoadLondon SW72AZUnited Kingdom Department of Computing Imperial College LondonExhibition RoadLondon SW72AZUnited Kingdom School of Transportation Science and Engineering Beihang UniversityKejiyuan RdHaidianBeijing 100083China Department of Aeronautics and Astronautics Kyoto UniversityYoshidahonmachiSakyo WardKyotoKyoto Prefecture 606-8501Japang Department of Mechanical Engineering Imperial College LondonExhibition RoadLondon SW72AZUnited Kingdom Department of Chemistry University of CambridgeThe Old SchoolsTrinity LnCambridge CB21TNUnited Kingdom

Mixed ionic electronic conductors(MIECs)have attracted increasing attention as anode materials for solid oxide fuel cells(SOFCs)and they hold great promise for lowering the operation temperature of SOFCs.However,there has been a lack of understanding of the performance-limiting factors and guidelines for rational design of composite metal-MIEC electrodes.Using a newly-developed approach based on 3 D-tomography and electrochemical impedance spectroscopy,here for the first time we quantify the contribution of the dual-phase boundary(DpB)relative to the three-phase boundary(TpB)reaction pathway on real MIEC electrodes.A new design strategy is developed for Ni/gadolinium doped ceria(CGO)electrodes(a typical MIEC electrode)based on the quantitative analyses and a novel Ni/CGO fiber-matrix structure is proposed and fabricated by combining electrospinning and tape-casting methods using commercial powders.With only 11.5 vol%nickel,the designer Ni/CGO fiber-matrix electrode shows 32%and 67%lower polarization resistance than a nano-Ni impregnated CGO scaffold electrode and conventional cermet electrode respectively.The results in this paper demonstrate quantitatively using real electrode structures that enhancing DpB and hydrogen kinetics are more efficient strategies to enhance electrode performance than simply increasing TpB.

关键词： Solid oxide fuel cells Electrospinning Electrochemical impedance spectroscopy Tomography 2-d model Ceria

Designer uniform Li plating/stripping through lithium–cobalt alloying hierarchical scaffolds for scalable high-performance lithium-metal anodes

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Journal of Energy Chemistry 2021年第1期30卷 385-392,I0013页

作者： Xinhua Liu Xiaojuan Qian Weiqiang Tang Hui Luo Yan Zhao Rui Tan Mo Qiao Xinlei Gao Yang Hua Huizhi Wang Shuangliang Zhao Chao Lai Magda Titirici nigel pbrandon Shichun Yang Billy Wub School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Imperial College London Sough Kensington CampusSW72AZLondonUnited Kingdom School of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou 221116JiangsuChina State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

Lithium metal anodes are of great interest for advanced high-energy density batteries such as lithiumair, lithium-sulfur and solid-state batteries, due to their low electrode potential and ultra-high theoretical capacity. There are, however, several challenges limiting their practical applications, which include low coulombic efficiency, the uncontrollable growth of dendrites and poor rate capability. Here, a rational design of 3D structured lithium metal anodes comprising of in-situ growth of cobalt-decorated nitrogen-doped carbon nanotubes on continuous carbon nanofibers is demonstrated via electrospinning.The porous and free-standing scaffold can enhance the tolerance to stresses resulting from the intrinsic volume change during Li plating/stripping, delivering a significant boost in both charge/discharge rates and stable cycling performance. A binary Co-Li alloying phase was generated at the initial discharge process, creating more active sites for the Li nucleation and uniform deposition. Characterization and density functional theory calculations show that the conductive and uniformly distributed cobalt-decorated carbon nanotubes with hierarchical structure can effectively reduce the local current density and more easily absorb Li atoms, leading to more uniform Li nucleation during plating. The current work presents an advance on scalable and cost-effective strategies for novel electrode materials with 3D hierarchical microstructures and mechanical flexibility for lithium metal anodes.

关键词： Li metal anode Mixed conductor interface 3D porous host Dendrite free Metal-carbon nanofibers

Utilization of Energy Storage and Hydrogen in power and Energy Systems:Viewpoints from Five Aspects

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CSEE Journal of power and Energy Systems 2023年第1期9卷 1-7页

作者： Yonghua Song Mohammad Shahidehpour Saifur Rahman nigel brandon Kai Strunz Jin Lin Yuxuan Zhao State Key Laboratory of Internet of Things for Smart City University of MacaoTaipaMacao 999078China Department of Electrical Engineering Tsinghua UniversityBeijing 100084China Galvin Center for Electricity Innovation Illinois Institute of TechnologyChicagoIL 60616USA Department of Advanced Research Institute Virginia Polytechnic Institute and State UniversityArlingtonVA 22203USA Department of Earth Science and Engineering Imperial College LondonLondon SW72AZU.K Department of Sustainable Electric Networks and Sources of Energy Technische Universitt Berlin10587 BerlinGermany State Key Laboratory of Control and Simulation of power Systems and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Decarbonizing power systems is crucial to mitigating climate change impacts and achieving carbon neutrality.Increasing renewable energy supply can reduce greenhouse gas emissions and accelerate the decarbonization process.However,renewable energy sources(RESs)such as wind and solar power are characterized by intermittency and often non-dispatchability,significantly challenging their high-level integration into power systems.Energy storage is acknowledged as a vital indispensable solution for mitigating the intermittency of renewables such as wind and solar power and boosting the penetrations of renewables.In the CSEE JpES Forum,five well-known experts were invited to give keynote speeches,and the participating experts and scholars had comprehensive exchanges and discussions on energy storage technologies.Specifically,the views on the design,control,performance,and applications of new energy storage technologies,such as the fuel cell vehicle,water electrolysis,and flow battery,in the coordination and operation of power and energy systems were analyzed.The experts also provided experience that could be used to develop energy storage for constructing and decarbonizing new power systems.

关键词： Electrolysis electric vehicle energy storage flow battery fuel cell electric vehicle hydrogen energy