W2N-MXene composite anode catalyst for efficient microbial fuel cells using domestic wastewater

被引:41
作者
Kolubah, Pewee Datoo [1 ]
Mohamed, Hend Omar [1 ]
Ayach, Maya [2 ]
Hari, Ananda Rao [3 ]
Alshareef, Husam N. [4 ]
Saikaly, Pascal [3 ,5 ]
Chae, Kyu-Jung [6 ,7 ]
Castano, Pedro [1 ,8 ]
机构
[1] King Abdullah Univ Sci & Technol KAUST, KAUST Catalysis Ctr KCC, Multiscale React Engn MuRE, Thuwal 239556900, Saudi Arabia
[2] KAUST, Core Labs & Res Infrastruct, Thuwal 23955, Saudi Arabia
[3] KAUST, Water Desalinat & Reuse Res Ctr, Biol & Environm Sci & Engn BESE Div, Thuwal, Saudi Arabia
[4] KAUST, Mat Sci & Engn, Phys Sci & Engn PSE, Thuwal, Saudi Arabia
[5] KAUST, Environm Sci & Engn Program, BESE, Thuwal, Saudi Arabia
[6] Korea Maritime & Ocean Univ, Coll Ocean Sci & Engn, Dept Environm Engn, 727 Taejong Ro, Busan 49112, South Korea
[7] Korea Maritime & Ocean Univ, Interdisciplinary Major Ocean Renewable Energy En, 727 Taejong ro, Busan 49112, South Korea
[8] KAUST, Chem Engn Program, PSE, Thuwal, Saudi Arabia
关键词
Microbial fuel cell; MXene; Tungsten nitride; Domestic wastewater; Electricity generation; Anode modification; POWER-GENERATION; PERFORMANCE; CARBIDE; NANOPARTICLES; ELECTRODES; DECORATION; MXENE; METAL;
D O I
10.1016/j.cej.2023.141821
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Microbial fuel cells (MFCs) have enormous potential to treat wastewater and reduce the energy demands of wastewater treatment plants while generating electricity using active microorganisms as biocatalysts. However, the practical application of MFCs is limited by the low power density produced, mainly due to poor anode performance. A tungsten nitride (W2N)-MXene composite catalyst is introduced to modify the anode surface for use in microbial fuel cells during domestic wastewater treatment. The aim is to improve the wettability, electrical conductivity, electron transfer efficiency, and microorganism attachment capability of the anode and ultimately increase the overall performance of the microbial fuel cell to produce electricity during wastewater treatment. In detail, a hydrofluoric acid etching approach is used to synthesize the Ti3C2Tx MXene, the urea glass technique is used to prepare the W2N particles, and an adequate mixing and heat treatment approach is used to produce the W2N-Ti3C2Tx composite catalyst. The W2N-Ti3C2Tx composite on carbon cloth anode provides one of the best performances recorded for MXene in this type of fuel cells and using real domestic wastewater: with a 523 % increase in the power density (548 mW m-2), an 83 % decrease in the chemical oxygen demand (COD), and a 161 % increase in the electron transfer efficiency compared to those of the plain carbon cloth. We demonstrate that this outstanding performance is due to the improvements in hydrophilicity and microorganism attachment, particularly nanowires (or pili) which promote electron transfer. The present work offers an exciting avenue toward the process scale-up and optimization of single-chamber microbial fuel cells.
引用
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页数:9
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