Jiali Yan , Mingchuan Zhang , Xi Chen , Chuanjie Chen , Xinyang Xu , Shaoyan Jiang
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引用次数: 0
摘要
MFC 的大规模应用受到电极成本高和功率密度低的限制。本研究讨论了三种新型秸秆生物炭的电化学结构和功率输出性能,并通过扫描电子显微镜、比表面积、循环伏安法、拉曼光谱、电化学阻抗谱等对其进行了表征。与普通碳毡电极相比,玉米秸秆生物炭电极获得了最佳的发电能力和电化学亲和性:具有大孔结构的粗糙表面和高度石墨化有利于电活性细菌的附着;最大输出电压、开路电压、功率密度和库仑效率分别达到 662.最大输出电压、开路电压、功率密度和库仑效率分别达到 662±4.03 mV、798.24±3.65 mV、1.54±0.18 W m-2 和 50.39±1.68%;最大 COD 去除率为 77.45±1.69%;玉米秸秆电极的交换电流密度(4.6142×10-4 A cm-2)比碳毡电极具有更好的电化学活性。这意味着玉米秸秆衍生生物炭是一种具有竞争力的 MFC 阳极原材料。
Straw-derived macroporous biochar as high-performance anode in microbial fuel cells
Large-scale application of MFCs is limited by the high cost of electrode and low power density. In this study, the electrochemical structure and power output performance of three novel straw-derived biochar are discussed and characterized by scanning electron microscope, specific surface area, cyclic voltammetry, Raman spectrum, electrochemical impedance spectroscopy etc. Compared with the common carbon felt electrode, the optimal electricity generation ability and electrochemical affinity are obtained in corn straw biochar electrode: the rough surface with macroporous structure and high degree of graphitization facilitates the attachment of electroactive bacteria; the maximum output voltage, open circuit voltage, power density and coulombic efficiency reach 662.64±4.03 mV, 798.24±3.65 mV, 1.54±0.18 W m−2 and 50.39±1.68 %, respectively; the maximum COD removal efficiency of 77.45±1.69 % is achieved; exchange current density (4.6142×10−4 A cm−2) in corn straw electrode presents the better electrochemical activity than that of carbon felt electrode. These implies that corn straw-derived biochar is a competitive raw material for MFC anode.
期刊介绍:
Process Biochemistry is an application-orientated research journal devoted to reporting advances with originality and novelty, in the science and technology of the processes involving bioactive molecules and living organisms. These processes concern the production of useful metabolites or materials, or the removal of toxic compounds using tools and methods of current biology and engineering. Its main areas of interest include novel bioprocesses and enabling technologies (such as nanobiotechnology, tissue engineering, directed evolution, metabolic engineering, systems biology, and synthetic biology) applicable in food (nutraceutical), healthcare (medical, pharmaceutical, cosmetic), energy (biofuels), environmental, and biorefinery industries and their underlying biological and engineering principles.