Direct carbon fuel cell (DCFC) with biomass as fuel is a promising power generation technology due to the high efficiency of DCFC system and renewability of biomass. This study aims to find the relationship of electrochemical performance between biomass and its thermal decomposition products, and also to reveal their degradation mechanisms during durability tests in solid oxide fuel cells. The thermochemical properties of biomass and biochar, the electrochemical behaviors of biomass, biochar and biogas were characterized comprehensively, and subsequently the degradation process of biomass, biochar and biogas fueled cells were analyzed. The results showed that raw biomass fueled cells produced considerable peak power density (PPD, 0.144 W cm⁻² at 1123 K) but experienced rapid discharge degradation. Torrefaction pretreatment (573K) of raw samples compromised PPDs while pyrolysis pretreatment (973K) enhanced PPDs. The electrochemical performance of raw biomass was the combined electrochemical contribution of its decomposition products (biochar and biogas). With biochar as fuel, the power was generated from CO electro-oxidation and biochar-CO₂ gasification. Feeding of CO₂ into the anode chamber continuously did not improve the output performance. The discharge degradation was mainly caused by the gradually decreasing gasification reactivity of biochar with CO₂ and slight anode carbon deposition. With biogas as fuel, the anode reactions were electro-oxidation of active species like H₂, CO, CH₄, and the cell degraded due to severe carbon deposition. Biomass, biochar and biogas fueled cells all suffered from anode carbon deposits, most of which were in the form of graphitic carbon.

由于DCFC系统的高效率和生物质的可再生性，以生物质为燃料的直接碳燃料电池（DCFC）是一种有前途的发电技术。这项研究旨在发现生物质及其热分解产物之间的电化学性能之间的关系，并揭示其在固体氧化物燃料电池的耐久性测试过程中的降解机理。全面表征了生物质和生物炭的热化学性质，生物质，生物炭和沼气的电化学行为，然后分析了生物质，生物炭和沼气供能的电池的降解过程。结果表明，以生物质为燃料的原始电池产生了可观的峰值功率密度（PPD，0.144 W cm ^-2）在1123 K时），但放电迅速退化。原始样品的焙烧预处理（573K）损害了PPD，而热解预处理（973K）增强了PPD。原始生物质的电化学性能是其分解产物（生物炭和沼气）的综合电化学贡献。以生物炭为燃料，通过CO电氧化和生物炭-CO ₂气化来发电。连续将CO ₂进料到阳极室中并没有改善输出性能。放电性能下降主要是由于生物炭与CO _2的气化反应性逐渐降低以及阳极碳的沉积所致。以沼气为燃料，阳极反应是H ₂等活性物质的电氧化。，CO，CH ₄和由于严重的碳沉积而导致细胞降解。生物质，生物炭和沼气燃料电池均遭受阳极碳沉积，其中大多数为石墨碳形式。