Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 43, Issue 7, Pages 2468-2477Publisher
WILEY
DOI: 10.1002/er.3968
Keywords
biochar; Boudouard reaction; carbon fuel; direct carbon fuel cell; solid oxide fuel cells
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Funding
- National Science Foundation of Guangdong Province [U1601207]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
- Special Funds of Guangdong Province Public Research and Ability Construction [2014A010106008]
- National Science Foundation of China [U1601207, 21276097]
- Environmental Conservation Fund of Hong Kong SAR [ECF 54/2015]
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Direct carbon solid oxide fuel cell (DC-SOFC) is a promising technology for electricity generation from biomass with high conversion efficiency and low pollution. Biochar derived from wheat straw is utilized as the fuel of a DC-SOFC, with cermet of silver and gadolinium-doped ceria as the material of both cathode and anode and yttrium stabilized zirconia as electrolyte. The output performance of a DC-SOFC operated on pure wheat straw is 197 mW cm(-2) at 800 degrees C and increases to 258 mW cm(-2) when 5% of Ca, as a catalyst of the Boudouard reaction, is loaded on the wheat straw char. Higher power and fuel conversion utilization are achieved by using Ca as the Boudouard reaction catalyst. X-ray diffraction, scanning electron microscopy, energy-dispersive spectrometer, and programmed-temperature gravimetric experiment are applied to characterize the leaf char. It turns out that the wheat straw char is with porous structure and composed of C, K, Mg, Cl, Fe, and Ca elements. The effects of the Ca catalyst on the Boudouard reaction, the performance of the DC-SOFCs operated on the wheat straw char, and the economic advantages of the wheat straw char are demonstrated and analyzed in detail.
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