Research Reports

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Institute: St Andrews

Tailoring of microstructural evolution in impregnated SOFC electrodes

Prof. John Irvine

The objective of this project is to develop and demonstrate solution methods for introducing the active constituents into SOFCs. If successful, the new approach could be applied to the manufacture of fuel cells that combine high performance with durability and resistance to contaminants.

Methodologies will be developed to tailor impregnations over a broad range of composition space. Studies utilising electrochemical, spectroscopic and microstructural techniques will be used to test performance, durability and resistance to contaminants, thus informing a choice of impregnate systems.

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For a detailed presentation on the project, click through here.

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Institute: Imperial College

Control of structure, strain and chemistry: route to designer interfaces in SOFCs

Prof. Stephen Skinner

This project will provide unique insights into the processes that control charge transport at interfaces in fuel cells, and will provide routes to engineer optimized electrodes. The key objectives in this project are to:

  1. Determine surface chemistry of air-electrode environment interfaces under operating conditions (in operando).
  2. Relate catalytic activity to surface structure and cation segregation effects.
  3. Probe strain and structure at buried interfaces (electrolyte/electrode).
  4. Design and manufacture electrode structures with 2D and/or 3D engineered interfaces.
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Institute: Imperial College

Electrodes by design – microstructural engineering of high performance electrodes for solid oxide fuel cells

Prof. Nigel Brandon

The electrode, and the electrolyte-electrode interface, play a critical role in the performance of all cells. In Solid Oxide Fuel Cells (SOFCs) the microstructures of the porous composite anode and cathode are particularly critical, as they determine the electrochemical, electrical, mechanical and transport properties of the electrode, and of current distribution to/from the electrode/electrolyte interface.

Current state of the art SOFC electrodes rely on a largely empirical understanding to establish the electrode microstructure. Our prior work has established a new suite of tools and techniques that offer the prospect of moving towards a design-led approach to manufacture of improved electrodes, based on our ability to image, model, simulate and fabricate new electrode structures with controlled properties.

This proposal seeks to develop and further demonstrate our analysis and modelling tools; using design optimum structures fabricated with three novel processing techniques established by the academic team, and then measuring device performance to feedback into the design process.

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Institute: Imperial College

Novel diagnostic tools and techniques for monitoring and control of SOFC stacks – understanding mechanical and structural change

Prof. Nigel Brandon

This proposal seeks to develop two novel diagnostic techniques, pioneered by UK researchers, and apply them to advanced cell testing and characterisation in conjunction with partners in South Korea. The measurements are used to validate models developed in the UK to relate the measured data to degradation and failure modes, transferring this to South Korean partners to offer the potential for real time monitoring and control of SOFC stacks.

This will give valuable understanding required to refine and develop the next generation of SOFC systems in the most time efficient manner, and have wider impact on UK and other international developers. The programme will also support an exchange of researchers between the UK and South Korea.

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Institute: Warwick

Flame Solid Oxide Fuel Cells, Simple Devices to Extract Electricity Directly from Natural Gas and Liquid Petroleum Gas Flames

Prof. Shanwen Tao

The aim of this proposal is to demonstrate the capacity of direct flame solid oxide fuel cells (DFFCs) to extract electricity directly from natural gas and liquid petroleum gas (LPG) flames. We will demonstrate DFFCs which can be directly put in the flame of a burner/cooker to generate electricity with the application of advanced materials.

The novelty of these DFFCs lies in optimising the flame positioning and the use of a redox stable cathode to improve the durability during redox and thermal cycling. Sealing is not required and DFFCs are relatively safe.

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Institute: Lancaster & St-Andrews

Application of novel electrode structures developed for SOFC technologies into AFC systems to increase anode performance and cycling durability

Dr Richard Dawson

Prof John Irvine

GRANT COMPLETED

This project will be investigating the use of exsolution decorated, electronically conductive, perovskite materials to produce alkaline fuel cell (AFC) electrode structures. It is hoped these structures will display enhanced activity, improved startup characteristics, and improved cycling and steady state durability.

Work has been completed at St Andrews developing and tailoring methods for generating high surface area powders with large numbers of active exsolutions of candidate electrocatalyst. This has been complemented by electrode development and testing at Lancaster University.

Institute: Imperial College

Application of 3D imaging and analysis to the design of improved current collectors for Solid Oxide Fuel Cells

Prof Nigel Brandon

Prof Alan Atkinson

GRANT COMPLETED

This project sought to apply 3D imaging and modelling methods to develop a design tool that would support the design of current collectors for SOFC electrodes.

The result was the development and demonstration of a new methodology to understand how porous ceramic materials respond to point loads. This was validated against 3D imaging and nano-indentation experiments on SOFC cathodes.

Institute: UCL (all)

Dimensional change in polymer electrolyte fuel cells: from electrode to stack

Dr Dan Brett

Dr Paul Shearing

Prof Xiao Guo

This project will examine dimensional change at the electrode, electrolyte, gas diffusion layer, cell and stack level.

The project has delivered a controlled compression stack assembly that can be used by commercial stacks. The use of X-ray computed tomography has been demonstrated for examining the deformation of the fibres in gas diffusion layers when put under compression, while the quartz crystal microbalance was used to probe water uptake dynamics and associated membrane dimensional change.

Ongoing work is being undertaken to use neutron imaging to understand the role of water in determining dimensional change in components, and to use electrochemical atomic force microscopy to examine the effect of dimensional change induced by ionomer swelling in electrodes.

An extensive presentation on the project’s progress can be found here.