Environmental Technology ( IF 2.8 ) Pub Date : 2020-10-13 , DOI: 10.1080/09593330.2020.1829088 Aicha Zerrouki 1 , Mostefa Kameche 2 , Ahcene Ait Amer 1 , Ahlem Tayeb 1 , Douniazeed Moussaoui 1 , Christophe Innocent 3
ABSTRACT
A microbial fuel cell is a biological electrochemical system that extracts electrons stored in organic matter by oxidation using catalytic properties of microorganisms at bioanode. The major problem in such device, is however limited power production due to slow kinetic of oxygen reduction at cathode. It is worthwhile to develop new materials that fulfil these requirements. The polymerization of aniline onto carbon cloth for effective electrodeposition of platinum nanoparticles has been carried out by chronoamperometry and cyclic voltammetry. Three materials were thus elaborated, namely pristine carbon cloth, carbon cloth modified with platinum and carbon cloth modified by polymerization of aniline for immobilization of Pt-nanoparticles. The FTIR spectroscopy analysis revealed characteristic band located in 1720–1650 cm−1, attributed to imine function, main component in skeleton of polymer PANI chain. The modified materials have been utilized as cathode in cell inoculated with medicinal plant wastes for improvement of oxygen reduction. Modified cathode with CC-PANI-Pt proved higher performances in all respects: increase of cell voltage from 338 to 765 mV and power density from 862 to 1510 mW/m2 and abatement of COD of microbial inoculum leachate to 88%. Another feature of cell with modified cathode CC-PANI-Pt, was the enormous electric charge density harvested upon oxidation of 1 mL of acetate 7.62 C/cm2 compared to that of cell with pristine CC cathode 0.54 C/cm2. Nevertheless, coulombic efficiency for conversion of medicinal plant wastes into bioenergy was relatively lower 9%, making in evidence that elaborated electrochemical device was rather efficient and benificial environmentally than energetically.
中文翻译:
铂纳米粒子嵌入碳布上的聚苯胺中:改善用于将药用植物废物转化为生物能源的微生物燃料电池阴极的氧还原
摘要
微生物燃料电池是一种生物电化学系统,它利用生物阳极上微生物的催化特性,通过氧化提取储存在有机物中的电子。然而,这种装置的主要问题是由于阴极处氧还原的缓慢动力学而限制了功率产生。开发满足这些要求的新材料是值得的。通过计时电流法和循环伏安法将苯胺聚合到碳布上以有效电沉积铂纳米粒子。因此,开发了三种材料,即原始碳布、铂改性碳布和苯胺聚合改性碳布,用于固定铂纳米颗粒。FTIR光谱分析揭示了位于1720-1650 cm -1的特征带,归因于亚胺功能,是聚合物聚苯胺链骨架中的主要成分。改性材料已被用作接种药用植物废物的电池中的阴极,以改善氧还原。使用 CC-PANI-Pt 改性的阴极在各个方面都证明了更高的性能:电池电压从 338 提高到 765 mV,功率密度从 862 提高到 1510 mW/m 2以及微生物接种浸出液的 COD 降低到 88%。具有改性阴极 CC-PANI-Pt 的电池的另一个特点是,与具有原始 CC 阴极 0.54 C/cm 2的电池相比,在氧化 1 mL 醋酸盐时获得的巨大电荷密度为 7.62 C/ cm 2. 然而,将药用植物废物转化为生物能源的库仑效率相对较低,为 9%,这表明精心制作的电化学装置在环境方面比在能源方面更有效和有益。