以椰壳生物质炭为燃料的直接炭固体氧化物燃料电池

通过热裂解制得椰壳炭，表征了其结构和组成，并将其用于电解质为钇稳定化氧化锆（YSZ）、电极材料为银和钆掺杂氧化铈（Ag-GDC）的固体氧化物燃料电池（SOFC）的燃料，对所构成的直接炭固体氧化物燃料电池（DC-SOFC）的性能进行了测试研究。结果表明，所制得的椰壳炭颗粒粒径在微米级别，具有介孔结构，而且椰壳炭中含有K、Ca等元素，可用作Boudouard反应催化剂。当使用椰壳炭作为DC-SOFC燃料时，在800 ℃下电池最大功率密度为255 mW/cm²；负载Fe催化剂后，最大功率密度提升为274 mW/cm²。以0.5 A/cm²的恒电流放电，0.5 g负载Fe椰壳炭燃料电池能够连续工作17.6 h，燃料利用率为39%，表明椰壳炭作为DC-SOFC燃料具有优异的性能和潜力。

Biochar derived from coconut as fuel for the direct carbon solid oxide fuel cell

Coconut char is prepared by pyrolysis and used as the fuel for the direct carbon solid oxide fuel cell (DC-SOFCs), which are composed of yttrium-stabilized zirconia (YSZ) electrolyte and silver and gadolinium-doped ceria (Ag-GDC) cermet electrodes. The microstructure and composition of coconut char are characterized and the performances of DC-SOFCs with coconut char as fuel was investigated. The results show that the as-prepared coconut biochar has a mesoporous structure and a particle size of several microns; moreover, it contains K and Ca elements, favorable for the Boudouard reaction. A peak power density of 255 mW/cm² is observed for the DC-SOFC operated at 800 ℃ with coconut char as fuel; it increases to 274 mW/cm² when the char is loaded with Fe as a promoter to improve the reverse Boudouard reaction. The discharging time of the cell with 0.5 g Fe-loaded coconut char operated at a constant current density of 0.5 A/cm² lasts for 17.6 h, representing a fuel conversion of 39%, demonstrating the feasibility and superiority of coconut char as a fuel for DC-SOFCs.