Imperial College London

Professor Nigel Brandon OBE FREng

Faculty of Engineering

Dean of the Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 8600n.brandon Website

 
 
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Location

 

2.06Faculty BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

424 results found

Howey DA, Mitcheson PD, Yufit V, Offer GJ, Brandon NPet al., 2014, Online Measurement of Battery Impedance Using Motor Controller Excitation, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, Vol: 63, Pages: 2557-2566, ISSN: 0018-9545

Journal article

Ruiz-Trejo E, Boldrin P, Lubin A, Tariq F, Fearn S, Chater R, Cook SN, Gruar RI, Tighe CJ, Brandon NP, Darr J, Atkinson Aet al., 2014, Novel Composite Cermet for Low-Metal-Content Oxygen Separation Membranes, Chemistry of Materials

Journal article

Lomberg M, Ruiz-Trejo E, Offer G, Brandon NPet al., 2014, Characterization of Ni-Infiltrated GDC Electrodes for Solid Oxide Cell Applications, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 161, Pages: F899-F905, ISSN: 0013-4651

Journal article

Maskell WC, Brett DJL, Brandon NP, 2014, Thick-film amperometric zirconia oxygen sensors: influence of cobalt oxide as a sintering aid, Publisher: IOP PUBLISHING LTD, ISSN: 0957-0233

Conference paper

Tariq F, Yufit V, Eastwood DS, Merla Y, Biton M, Wu B, Chen Z, Freedman K, Offer GJ, Peled E, Lee PD, Golodnitsky D, Brandon NPet al., 2014, In-Operando X-ray Tomography Study of Lithiation Induced Delamination of Si Based Anodes for Lithium-Ion Batteries, Electrochemistry Letters, Vol: 3

Silicon-Lithium based rechargeable batteries offer high gravimetric capacity. However cycle life and electrode microstructure failure mechanisms remain poorly understood. Here we present an X-ray tomography method to investigate in-operando lithiation induced stress cracking leading to the delamination of a composite Si based electrode. Simultaneous voltage measurements show increased cell resistance correlating with severe delamination and microstructural changes. 3D analysis revealed 44.1% loss of the initial electrode-current collector area after 1 hour of operation at 2.4 mA/cm2 and a 21.2% increase in new anode surface area. The work represents a new basis for future investigation of Si based anodes.

Journal article

Chakrabarti MH, Brandon NP, Hajimolana SA, Tariq E, Yufit V, Hashim MA, Hussain MA, Low CTJ, Aravind PVet al., 2014, Application of carbon materials in redox flow batteries, JOURNAL OF POWER SOURCES, Vol: 253, Pages: 150-166, ISSN: 0378-7753

Journal article

Kalyvas C, Kucernak A, Brett D, Hinds G, Atkins S, Brandon Net al., 2014, Spatially resolved diagnostic methods for polymer electrolyte fuel cells: a review, WILEY INTERDISCIPLINARY REVIEWS-ENERGY AND ENVIRONMENT, Vol: 3, Pages: 254-275, ISSN: 2041-8396

Journal article

Wu B, Parkes MP, Yufit V, De Benedetti L, Veismann S, Wirsching C, Vesper F, Martinez-Botas RF, Marquis AJ, Offer GJ, Brandon NPet al., 2014, Design and testing of a 9.5 kWe proton exchange membrane fuel cell-supercapacitor passive hybrid system, International Journal of Hydrogen Energy

The design and test of a 9.5 kWe proton exchange membrane fuel cell passively coupled with a 33 × 1500 F supercapacitor pack is presented. Experimental results showed that the system reduced dynamic loads on the fuel cell without the need for additional DC/DC converters. Fuel efficiency gains of approximately 5% were achieved by passive hybridisation in addition to addressing two main operational degradation mechanisms: no-load idling and rapid load cycling.Electrochemical Impedance Spectroscopy measurements indicated that the supercapacitor capacitance dropped with decreasing cell voltage and suggested that operation below 1.3 V is not recommended. Knee-frequency measurements suggested little benefit was gained in using passive systems with load cycles that have frequency components above 0.19 Hz. Analysis of system sizing suggested using the minimum number of supercapacitors to match the open circuit voltage of the fuel cell to maximise load buffering.

Journal article

Eastwood DS, Bradley RS, Tariq F, Cooper SJ, Taiwo OO, Gelb J, Merkle A, Brett DJL, Brandon NP, Withers PJ, Lee PD, Shearing PRet al., 2014, The application of phase contrast X-ray techniques for imaging Li-ion battery electrodes, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, Vol: 324, Pages: 118-123, ISSN: 0168-583X

Journal article

Eastwood DS, Yufit V, Gelb J, Gu A, Bradley RS, Harris SJ, Brett DJL, Brandon NP, Lee PD, Withers PJ, Shearing PRet al., 2014, Lithiation- Induced Dilation Mapping in a Lithium- Ion Battery Electrode by 3D X- Ray Microscopy and Digital Volume Correlation, ADVANCED ENERGY MATERIALS, Vol: 4, ISSN: 1614-6832

Journal article

Tariq F, Yufit V, Kishimoto M, Shearing PR, Menkin S, Golodnitsky D, Gelb J, Peled E, Brandon NPet al., 2014, Three-dimensional high resolution X-ray imaging and quantification of lithium ion battery mesocarbon microbead anodes, JOURNAL OF POWER SOURCES, Vol: 248, Pages: 1014-1020, ISSN: 0378-7753

Journal article

Tariq F, Yufit V, Kishimoto M, Cui G, Somalu M, Brandon Net al., 2014, Advanced 3D Imaging and Analysis of SOFC Electrodes, Symposium on Solid State Ionic Devices 10 held during the 226th Meeting of the Electrochemical-Society, Publisher: ELECTROCHEMICAL SOC INC, Pages: 81-86, ISSN: 1938-5862

Conference paper

Kishimoto M, Lomberg M, Ruiz-Trejo E, Brandon NPet al., 2014, Towards the Microstructural Optimization of SOFC Electrodes Using Nano Particle Infiltration, Symposium on Solid State Ionic Devices 10 held during the 226th Meeting of the Electrochemical-Society, Publisher: ELECTROCHEMICAL SOC INC, Pages: 93-102, ISSN: 1938-5862

Conference paper

Chung D-W, Shearing PR, Brandon NP, Harris SJ, Garcia REet al., 2014, Particle Size Polydispersity in Li-Ion Batteries, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 161, Pages: A422-A430, ISSN: 0013-4651

Journal article

Kishimoto M, Lomberg M, Ruiz-Trejo E, Brandon NPet al., 2014, Towards the microstructural optimisation of solid oxide fuel cell electrodes

One-dimensional numerical simulation and microstructural analysis of solid oxide fuel cell (SOFC) electrodes are carried out to investigate the effect of the characteristic length scale of the porous electrodes on the performance. The sensitivity of the current density is analysed over a wide range of triple-phase boundary (TPB) density and mean-pore size, which affect the electrochemical reaction and gas transport. Comparison between conventional electrodes and nano-particle infiltrated electrodes reveals that reducing characteristic length scale in the conventional electrodes helps improve the electrode performance by reducing the reaction resistance; however, introducing nano particles into the electrodes is expected to be more effective as it has a potential to increase the TPB density whilst keeping better gaseous transport through the electrodes. The three-dimensional microstructures of both types of electrodes are obtained with focused ion beam scanning electron microscopy and provide useful microstructural information that supports the numerical analysis.

Conference paper

Guerra C, Lanzini A, Leone P, Santarelli M, Brandon NPet al., 2014, Optimization of dry reforming of methane over Ni/YSZ anodes for solid oxide fuel cells, JOURNAL OF POWER SOURCES, Vol: 245, Pages: 154-163, ISSN: 0378-7753

Journal article

kucernak, brandon, yufit, 2013, regenerative fuel cells

The present invention provides a regenerative fuel cell comprising an anionic membrane capable of selectively passing anions, wherein the pH of the anolyte and/or catholyte is at least 10. The present invention also relates to a method of operating a regenerative fuel cell comprising an anionic membrane capable of selectively passing anions, wherein the pH of the anolyte and/or catholyte is at least 10.

Patent

Wu B, Yufit V, Marinescu M, Offer GJ, Martinez-Botas RF, Brandon NPet al., 2013, Coupled thermal–electrochemical modelling of uneven heat generation in lithium-ion battery packs, Journal of Power Sources, Vol: 243, Pages: 544-554, ISSN: 0378-7753

Abstract In battery packs with cells in parallel, the inter-cell connection resistances can cause unequal loads due to non-uniform interconnect overpotentials and consequentially lead to non-uniform heating. This article explores how load imbalances are generated in automotive applications, by describing a battery pack with finite interconnect resistances. Each cell inside the pack is represented by a pseudo 2D electrochemical model coupled with a lumped thermal model. Increasing the number of cells in parallel results in a linear increase in load non-uniformity, whilst increasing the ratio of interconnect to battery impedance results in a logarithmic increase in load non-uniformity, with cells closest to the load points experiencing the largest currents. Therefore, interconnect resistances of the order of mΩ can have a significant detrimental impact. Under steady state discharge the cell impedance changes until the loads balance. This process, however, can take hundreds of seconds and therefore may never happen under dynamic load cycles. Cycling within a narrow state-of-charge range and pulse loading are shown to be the most detrimental situations. Upon load removal, re-balancing can occur causing further heating. Simulation of a 12P7S pack under a real world load cycle shows that these effects could cause localised thermal runaway.

Journal article

Chakrabarti MH, Brandon NP, Mjalli FS, Bahadori L, Al Nashef IM, Hashim MA, Hussain MA, Low CTJ, Yufit Vet al., 2013, Cyclic Voltammetry of Metallic Acetylacetonate Salts in Quaternary Ammonium and Phosphonium Based Deep Eutectic Solvents, JOURNAL OF SOLUTION CHEMISTRY, Vol: 42, Pages: 2329-2341, ISSN: 0095-9782

Journal article

Lorente E, Berrueco C, Millan M, Brandon NPet al., 2013, Effect of tar fractions from coal gasification on nickel-yttria stabilized zirconia and nickel-gadolinium doped ceria solid oxide fuel cell anode materials, JOURNAL OF POWER SOURCES, Vol: 242, Pages: 824-831, ISSN: 0378-7753

Journal article

Cooper SJ, Kishimoto M, Tariq F, Bradley RS, Marquis AJ, Brandon NP, Kilner JA, Shearing PRet al., 2013, Microstructural Analysis of an LSCF Cathode Using In Situ Tomography and Simulation, ECS Transactions, Vol: 57, Pages: 2671-2678, ISSN: 1938-6737

Electrode tortuosity factor is a key input parameter in many fuel cell simulations. Three-dimensional microstructural data obtained from in-situ synchrotron X-ray nano-computed tomography is used as the basis for comparing five approaches to quantify the tortuosity factor. Three of these techniques are based on diffusivity simulations and showed strong correlation, but had consistently different absolute values. A random walk method showed a good degree of correlation to the diffusive approaches, but had the largest values overall. Lastly, a calculation that used a mean pore centroid approach showed little correlation to any of the other three methods, but compared well with the conventional Bruggeman correlation. Due to the diffusive nature of the ionic transport in electrodes, the authors would recommend calculating tortuosity factors using a diffusive approach based on the voxels rather than a remeshed volume.

Journal article

Tariq F, Kishimoto M, Cooper SJ, Shearing PR, Brandon NPet al., 2013, Advanced 3D Imaging and Analysis of SOFC Electrodes, ECS Transactions, Vol: 57, Pages: 2553-2562, ISSN: 1938-6737

Solid Oxide Fuel Cells (SOFC) are electrochemical devices where performance is dependent on reactions inside porous electrode microstructures; their complexity is inadequately described using 2D imaging. Here we use X-ray Nano-CT tomographic techniques to probe 3D electrode structures (anodes and cathodes) at micro-nanometer length scales produced using a focused ion beam. Subsequently, micro/nano structural changes in SOFC electrodes are followed and quantified to facilitate understanding changes that occur in shape, structures and morphology at high sub-100nm resolution. Time-resolved (4D) imaging revealed Ni-YSZ oxidation markedly increased above 500 ºC and LSCF densification at 700 ºC may close pores. Utilising 3D electrode data as geometric inputs for numerical models, revealed that increased strains were located at Ni-YSZ interfaces and at microstructure constrictions for both anodes and cathodes when heated. The results show nano/micro structural changes can affect the performance of SOFC electrodes. This combined experimental and modelling approach can help in establishing structure/performance relationships providing key insights important for transport, electrochemistry and strains in both SOFC anodes and cathodes and understanding sources of performance degradation.

Journal article

Brandon NP, Corcoran D, Cummins D, Duckett A, EI-Khoury K, Haigh D, Leah R, Lewis G, Maynard N, McColm T, Trezona R, Selcuk A, Schmidt Met al., 2013, Development of metal supported solid oxide fuel cells for operation at 500-600 °c, Pages: 2900-2903, ISSN: 1059-9495

A novel metal-supported solid oxide fuel cell has been developed that is capable of operating at temperatures of 500-600 °C. The rationale behind the materials used to construct this fuel cell type is given, and results are presented from cell testing on hydrogen and reformed natural gas, including durability trials of some 2500 h duration. This new fuel cell variant is shown to be tolerant of carbon monoxide, durable, robust to thermal and redox cycling, and capable of delivering technologically relevant power densities. © 2013 ASM International.

Conference paper

Chakrabarti MH, Low CTJ, Brandon NP, Yufit V, Hashim MA, Irfan MF, Akhtar J, Ruiz-Trejo E, Hussain MAet al., 2013, Progress in the electrochemical modification of graphene-based materials and their applications, Electrochimica Acta, Vol: 107, Pages: 425-440, ISSN: 0013-4686

Graphene is a 2D allotrope of carbon with exciting properties such as extremely high electronic conductivity and superior mechanical strength. It has considerable potential for applications in fields such as bio-sensors, electrochemical energy storage and electronics. In most cases, graphene has been functionalized and modified with other materials to prepare composites. This work reviews the electrochemical modification of graphene. Commencing with a brief history, a summary of several different means of modifying graphene to effect diverse applications is provided. This is followed by a discussion on different composite materials that have been prepared with reduced graphene oxide prior to moving onto a detailed consideration of six different methods of electrochemically modifying graphene to prepare composite materials. These methods involve cathodic reduction of graphene oxide, electrophoretic deposition, electro-deposition techniques, electrospinning, electrochemical doping and electrochemical polymerization. Finally a consideration on the applications of electrochemically modified graphene composite materials in various fields is presented prior to discussing some prospects in enhancing the electrochemical process to realize excellent and economic composite materials in bulk.

Journal article

Rhazaoui K, Cai Q, Adjiman CS, Brandon NPet al., 2013, Towards the 3D modeling of the effective conductivity of solid oxide fuel cell electrodes: I. Model development, CHEMICAL ENGINEERING SCIENCE, Vol: 99, Pages: 161-170, ISSN: 0009-2509

Journal article

Maher RC, Duboviks V, Offer GJ, Kishimoto M, Brandon NP, Cohen LFet al., 2013, Raman Spectroscopy of Solid Oxide Fuel Cells: Technique Overview and Application to Carbon Deposition Analysis, FUEL CELLS, Vol: 13, Pages: 455-469, ISSN: 1615-6846

Journal article

Millichamp J, Mason TJ, Brandon NP, Brown RJC, Maher RC, Manos G, Neville TP, Brett DJLet al., 2013, A study of carbon deposition on solid oxide fuel cell anodes using electrochemical impedance spectroscopy in combination with a high temperature crystal microbalance, JOURNAL OF POWER SOURCES, Vol: 235, Pages: 14-19, ISSN: 0378-7753

Journal article

Somalu MR, Yufit V, Brandon NP, 2013, The effect of solids loading on the screen-printing and properties of nickel/scandia-stabilized-zirconia anodes for solid oxide fuel cells, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Vol: 38, Pages: 9500-9510, ISSN: 0360-3199

Journal article

Chakrabarti MH, Brandon NP, Hashim MA, Mjalli FS, AlNashef IM, Bahadori L, Manan NSA, Hussain MA, Yufit Vet al., 2013, Cyclic Voltammetry of Iron (III) Acetylacetonate in Quaternary Ammonium and Phosphonium Based Deep Eutectic Solvents, INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, Vol: 8, Pages: 9652-9676, ISSN: 1452-3981

Journal article

Somalu MR, Yufit V, Shapiro IP, Xiao P, Brandon NPet al., 2013, The impact of ink rheology on the properties of screen-printed solid oxide fuel cell anodes, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Vol: 38, Pages: 6789-6801, ISSN: 0360-3199

Journal article

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