Highly efficient utilization of walnut shell biochar through a facile designed portable direct carbon solid oxide fuel cell stack

Yongmin Xie, Jie Xiao, Qingsheng Liu, Xiaoqiang Wang, Jiang Liu, Peijia Wu and Shaobo Ouyang

Energy, 2021, vol. 227, issue C

Abstract: The direct carbon solid oxide fuel cell (DC-SOFC) is a green and efficient energy conversion device with all-solid-state structure, which can convert carbon fuel into electricity directly. Recently, using biomasses as fuels for DC-SOFC has become fascinating due to their abundance and renewable property. However, it usually provides inferior performance compared to that with gas fuel feeding (hydrogen). Here, we report a promising and high-performing tubular segmented-in-series YSZ electrolyte-supported DC-SOFC stack. Thereinto, the YSZ electrolyte supports are fabricated by dip-coating and both pure walnut shell biochar and Fe-loaded biochar are used as fuels. The single cell can achieve a maximum power density of 147 mW cm−2 at 800 °C and it is improved to 205 mW cm−2 as FenOm catalyst is loaded on the biochar fuel. Furthermore, a two-cell-stack of DC-SOFC operated with Fe-loaded walnut shell char is assembled and tested. It delivers an outstanding performance, with an OCV of 1.98 V, an output power of 1.11 W and a maximum volumetric power density of 505 mW cm−3 at 800 °C, indicating high potentials for developing into a high performance battery for portable or distributed applications.

Keywords: Direct carbon solid oxide fuel cells; Tubular; Biochar; Cell stack; High performance (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:227:y:2021:i:c:s0360544221007052

DOI: 10.1016/j.energy.2021.120456

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