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Utilisation of coal in direct carbon fuel cells

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Author(s)

John Thomas Sirr Irvine, Aida Fuente Cuesta, Andrew Mottram, Cairong Jiang, Cristian Daniel Savaniu, Sneh Lata Jain

School/Research organisations

Abstract

Hybrid Direct Carbon Fuel Cells merge Solid Oxide Fuel Cell (SOFC) and MCFC technologies, using a solid oxide electrolyte to separate the cathode and anode compartments, while a molten carbonate electrolyte is utilised to extend the anode/electrolyte region. Oxygen is reduced to O2- ions at the cathode and transported across the solid electrolyte membrane to the anode compartment, where carbon is oxidised to CO2. Molten carbonate could enhance the carbon oxidation in two ways as a fuel carrier or as an electrochemical mediator. The maximum energy density can be achieved by fully oxidising carbon to CO2 offering very high efficiencies. This concept has been demonstrated using a wide range of carbons and carbon-rich fuels such as coal, plastics, carbon colloids, activated carbons and charcoals. In a short stack of 3 cells delivered a maximum power output at 650°C of 5.4 W, at over 100mWcm-2. The underlying chemical processes in DCFCs are complex involving a series of catalytic and electrochemical reactions of a complex fuel. Coal and biochars are quite far from pure carbon comprising of high hydrogen content and often significant oxygen, sulphur and nitrogen contents as well as inorganic, ash components. Here we report on the pyrolysis and oxidation reactions and processes that occur in situ and in DCFC relevant conditions. Of key importance is interplay between carbon and its oxides as direct oxidation of carbon to carbon dioxide delivers the ultimate efficiency. There is a change in process above 750°C where the reverse Boudouard reaction becomes dominant and our focus is on understanding the lower temperature electrochemical processes.
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Details

Original languageEnglish
Title of host publication14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015
EditorsS. C. Singhal, K. Eguchi
PublisherElectrochemical Society
Pages2681-2684
Number of pages4
ISBN (Print)9781607685395
DOIs
Publication statusPublished - 2015
EventECS Conference on Electrochemical Energy Conversion & Storage with SOFC-XIV - Glasgow, United Kingdom
Duration: 26 Jul 201531 Jul 2015

Publication series

NameECS Transactions
PublisherElectrochemical Society
Number1
Volume68
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

ConferenceECS Conference on Electrochemical Energy Conversion & Storage with SOFC-XIV
CountryUnited Kingdom
CityGlasgow
Period26/07/1531/07/15

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