Department of Biotechnology, Indian Institute of Technology, Kharagpur, Kharagpur 721302, India.
Materials Science Centre, Indian Institute of Technology, Kharagpur, Kharagpur 721302, India.
Bioresour Technol. 2014 Aug;166:451-7. doi: 10.1016/j.biortech.2014.05.075. Epub 2014 May 29.
Three different approaches were employed to improve single chambered microbial fuel cell (sMFC) performance using Shewanella putrefaciens as biocatalyst. Taguchi design was used to identify the key process parameter (anolyte concentration, CaCl₂ and initial anolyte pH) for maximization of volumetric power. Supplementation of CaCl₂ was found most significant and maximum power density of 4.92 W/m(3) was achieved. In subsequent approaches, effect on power output by riboflavin supplementation to anolyte and anode surface modification using nano-hematite (Fe₂O₃) was observed. Volumetric power density was increased by 44% with addition of 100 nM riboflavin to anolyte while with 0.8 mg/cm(2) nano-Fe₂O₃ impregnated anode power density and columbic efficiency increased by 40% and 33% respectively. Cyclic voltammetry revealed improvement in electrochemical activity of Shewanella with nano-Fe₂O₃ loading and electrochemical impedance depicted inverse relationship between charge transfer resistance and nano-Fe₂O₃ loading. This study suggests anodic improvement strategies for maximization of power output.
采用三种不同的方法，使用腐生脱硫肠弧菌（Shewanella putrefaciens）作为生物催化剂来提高单室微生物燃料电池（sMFC）的性能。Taguchi 设计用于确定关键工艺参数（阳极电解液浓度、CaCl₂和初始阳极电解液 pH），以实现体积功率的最大化。结果发现，添加 CaCl₂的效果最为显著，最大体积功率密度达到 4.92 W/m³。在随后的方法中，观察了向阳极电解液中添加核黄素以及用纳米-赤铁矿（Fe₂O₃）修饰阳极对功率输出的影响。向阳极电解液中添加 100 nM 核黄素可使体积功率密度提高 44%，而 0.8 mg/cm²的纳米-Fe₂O₃浸渍阳极可使功率密度和库仑效率分别提高 40%和 33%。循环伏安法表明，纳米-Fe₂O₃负载可提高 Shewanella 的电化学活性，电化学阻抗谱显示，电荷转移电阻与纳米-Fe₂O₃负载呈反比关系。本研究提出了阳极改进策略，以最大限度地提高功率输出。
