钼钨双金属碳化物改性碳布阳极对微生物燃料电池产电性能的影响  

Effect of MoW bimetallic carbide modified carbon cloth anode on the power generation performance of microbial fuel cells

作　　者：刘佳璇 邱峥辉 朱轩亿 王少川 刘康楠 陈野[1] LIU Jiaxuan;QIU Zhenghui;ZHU Xuanyi;WANG Shaochuan;LIU Kangnan;CHEN Ye(College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China;State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute Qingdao 266237,China)

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001 [2]中国船舶集团有限公司第七二五研究所,海洋腐蚀与防护重点实验室,青岛266237

出　　处：《环境工程学报》2024年第12期3538-3547,共10页Chinese Journal of Environmental Engineering

摘　　要：产电微生物与阳极之间缓慢的胞外电子传递过程(EET)是限制微生物燃料电池(MFCs)输出功率的重要因素。为了提高EET效率,该研究采用牺牲模板、原位聚合和高温碳化相结合的方法,合成了由碳化钼、碳化钨纳米晶共掺杂的碳纳米管(MoW-CNTs)复合阳极催化剂。结果表明,MoW CNTs呈现二维纳米片接枝的中空纳米管结构,有利于微生物附着以及胞外电子捕获。同时,碳化钼和碳化钨的共掺杂有利于界面电催化活性的提升。MoW CNTs@CC在MFCs中的最大输出功率密度达到了2.80 W m^(−2),与碳布(CC)和Mo CNTs@CC相比分别提升了近4.51和1.94倍。MoW CNTs@CC还表现出最大的催化氧化峰值电流(1.25 mA cm^(−2))和最低的电荷转移电阻(84.15Ω),表明其具有优异的电催化活性和胞外电子传递效率。此外,MoW CNTs具有促进细菌定殖和富集电活性细菌的双重功能。与CC和Mo CNTs@CC相比,电活性菌Sulfurovum在MoW CNTs@CC表面的相对丰度显著有所提升,达到67.6%。MoW CNTs具有的高交联纳米片结构、超细双金属碳化物赋予了改性电极更大的比表面积、更高的电导率以及优异的生物电催化活性,从而显著提升了MFCs的产电性能。该研究为构建高性能MFCs阳极提供了一种新的选择。The sluggish extracellular electron transfer(EET)process between electroactive bacteria and the anode interface is the key factor for limiting the power output of microbial fuel cells(MFCs).To boost the EET efficiency,herein the anode electrocatalysts,carbon nanotubes co-doped with molybdenum carbide and tungsten carbide nanocrystals,are synthesized via a combination of sacrificial templates,in-situ polymerization,and hightemperature carbonization.The results showed that MoW CNTs present a hollow nanotube structure with uniformly grafted two-dimensional nanosheets,which is beneficial for bacterial adhesion and extracellular charge capture.Meanwhile,the co-doping of molybdenum carbide and tungsten carbide is conducive to enhancing the interfacial electrocatalytic activity.The MFCs equipped with MoW CNTs@CC attain a maximum power density of 2.80 W m^(−2),which is about 4.51 and 1.94 times higher than those of the CC and Mo CNTs@CC,respectively.In addition,MoW CNTs@CC exhibits the maximum catalytic oxidation peak current(1.25 mA cm^(−2))and the lowest charge transfer resistance(84.15Ω),demonstrating its excellently electrocatalytic activity and EET efficiency.Furthermore,MoW CNTs possess dual functions of promoting bacterial colonization and enriching electroactive bacteria.Compared with CC and Mo CNTs@CC,the relative abundance of the Sulfurovum genus on MoW CNTs@CC significantly increases to 67.6%.The highly crosslinked nanosheet architecture and ultrafine MoW bimetallic carbides of MoW CNTs endow the modified electrode with a larger surface area,elevated electronic conductivity,and enhanced bioelectrocatalytic activity,thus boosting the bioenergy output performance of MFCs.This study provides a new option for constructing high-performance anodes for MFCs.

关 键 词：微生物燃料电池 阳极 双金属碳化物 电活性微生物 产电性能 

分 类 号：X703[环境科学与工程—环境工程]