Direct carbon solid oxide fuel cells fed with ash-free bagasse versus bagasse-derived biochar: A comparative study

IF 7.5 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-10-03 DOI:10.1016/j.fuel.2025.137049

Zhenxi Han , Hanwen Tan , Haisheng Wang , Jie Chen , Han Zhang , Zongying Han

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Abstract

Direct carbon solid oxide fuel cells (DC-SOFCs) have attracted considerable attention as highly efficient power generation systems. This study provides a comparative assessment of performance and operational stability of Ni-YSZ anode-supported SOFCs fueled by ash-free raw bagasse versus its pyrolyzed biochar. Structural analysis confirmed pyrolysis-driven transformation of bagasse into a carbon-enriched biochar, evidenced by an elevated C/O ratio (7.6 vs. 1.6). Electrochemical evaluation demonstrated that SOFCs operating on direct bagasse achieved higher peak power density (324 mW/cm² at 800 °C) than those fueled by bagasse-derived biochar (277 mW/cm²), which is attributed to the in-situ generation of pyrolysis gases (H₂/CO/CH₄) during operation. Durability tests revealed divergent failure mechanisms: biochar-fueled cells experienced voltage collapse after 20 h at 0.3 A/cm² due to carbon depletion, whereas direct bagasse operation exhibited premature failure within 10 h at 0.4 A/cm² owing to fuel supply discontinuity. This study reveals that ash-free bagasse is a promising carbon–neutral fuel for SOFCs, and underscores the need for strategies to ensure continuous fuel delivery for sustained operation.

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以无灰甘蔗渣和甘蔗渣衍生生物炭为燃料的直接碳固体氧化物燃料电池：比较研究

直接碳固体氧化物燃料电池（DC-SOFCs）作为一种高效的发电系统受到了广泛的关注。本研究提供了Ni-YSZ阳极负载sofc的性能和运行稳定性的比较评估，这些sofc由无灰原料甘蔗渣和其热解生物炭作为燃料。结构分析证实了热解驱动的甘蔗渣转化为富含碳的生物炭，C/O比升高（7.6 vs. 1.6）证明了这一点。电化学评价表明，直接使用甘蔗渣的SOFCs在800°C时的峰值功率密度（324 mW/cm2）高于使用甘蔗渣衍生生物炭的SOFCs (277 mW/cm2)，这是由于在运行过程中现场产生了热解气体（H2/CO/CH4）。耐久性试验揭示了不同的失效机制：由于碳耗尽，生物炭燃料电池在0.3 A/cm2的电压下运行20小时后会发生电压崩溃，而甘蔗酯直接操作由于燃料供应中断，在0.4 A/cm2的电压下运行10小时就会过早失效。该研究表明，无灰甘蔗渣是sofc很有前途的碳中性燃料，并强调了确保持续运行的连续燃料输送策略的必要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.