A direct carbon solid oxide fuel cell fueled with char from wheat straw

Weizi Cai, Jiang Liu, Peipei Liu, Zhijun Liu, Haoran Xu, Bin Chen, Yuzhi Li, Qian Zhou, Meilin Liu, Meng Ni

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

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-2at 800°C and increases to 258 mW cm-2when 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.
Original languageEnglish
JournalInternational Journal of Energy Research
DOIs
Publication statusPublished - Jun 2019

Keywords

  • Biochar
  • Boudouard reaction
  • Carbon fuel
  • Direct carbon fuel cell
  • Solid oxide fuel cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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