CNT@Ti3C2TxMXene Nanocomposite Catalysts as Anodes to Improve the Electricity Production Performance of Microbial Fuel Cells

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2024-10-11 DOI:10.1007/s12678-024-00897-4

Meng Yu, Wenzheng Wang, Pengjie Wu, Hongyu Wen

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Abstract

The inherent disadvantages of carbon-based anodes, including their low hydrophilicity, significant charge transfer resistance, and limited power density, hinder their widespread commercial utilization in microbial fuel cells (MFC). Addressing these challenges, this study involved the surface modification of a carbon-based anode. To improve the adhesion of electroactive microorganisms (EAM) on the anode surface and increase the extracellular electron transfer rate, CNT@Ti₃C₂T_xMXene was applied to the surface of carbon cloth (CC) using drip coating. Initially, we conducted a comprehensive investigation on the optimal amount of modification required. To achieve this, we designed four distinct groups of modified electrodes. Through electrochemical analysis and phase characterization, it was determined that a modification dosage of 1.5 mg/cm² for CNT@Ti₃C₂T_xMXene/CC electrodes yielded the most optimal electrical conductivity and the highest capacitance. The Rs of CC is reduced from 1.48 to 0.55 Ω and the Rct from 2.62 to 2.09 Ω, and the capacitance is increased from 3.98 10⁻⁰⁷F to 9.11 10⁻⁰⁶F. Subsequently, the CNT@Ti₃C₂T_xMXene/CC with a modification of 1.5 mg/cm² was used as the anode of the microbial fuel cell. The modification of CNT@Ti₃C₂T_xMXene improved the power generation performance. The maximum output voltage of the MFC was increased from 546 to 709 mv, and the power density was increased from 44.9 to 101.8 mW/m². The underlying factor lies in the ability of CNT@Ti₃C₂T_xMXene/CC to significantly lower the internal resistance within the microbial fuel cell, thereby fostering the development of biofilm. Notably, our observations revealed that the biofilm formation was particularly facilitated on the anode surface of CNT@Ti₃C₂T_xMXene/CC. In essence, the CNT@Ti₃C₂T_xMXene-modified carbon cloth not only minimizes internal resistance but also enhances the electroactive surface area, exhibiting superior electrical conductivity. These attributes make it an advantageous material for biological applications.

Graphical Abstract

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CNT@Ti3C2TxMXene纳米复合催化剂作为阳极提高微生物燃料电池的发电性能

碳基阳极的固有缺点，包括其低亲水性、显著的电荷转移电阻和有限的功率密度，阻碍了其在微生物燃料电池（MFC）中的广泛商业应用。为了解决这些挑战，本研究涉及碳基阳极的表面改性。为了提高电活性微生物（EAM）在阳极表面的粘附能力，提高胞外电子传递速率，采用滴涂法在炭布（CC）表面涂覆CNT@Ti3C2TxMXene。最初，我们对所需的最佳修改量进行了全面的调查。为了达到这个目的，我们设计了四组不同的修饰电极。通过电化学分析和相表征，确定CNT@Ti3C2TxMXene/CC电极的改性用量为1.5 mg/cm2时电导率最佳，电容最高。CC的Rs从1.48降低到0.55 Ω， Rct从2.62降低到2.09 Ω，电容从3.98 10−07F提高到9.11 10−06F。随后，将改性为1.5 mg/cm2的CNT@Ti3C2TxMXene/CC用作微生物燃料电池的阳极。CNT@Ti3C2TxMXene的修改提高了发电性能。MFC的最大输出电压从546 mv提高到709 mv，功率密度从44.9 mW/m2提高到101.8 mW/m2。其根本原因在于CNT@Ti3C2TxMXene/CC能够显著降低微生物燃料电池内部的内阻，从而促进生物膜的发育。值得注意的是，我们的观察显示，在CNT@Ti3C2TxMXene/CC的阳极表面，生物膜的形成特别容易。实质上，CNT@Ti3C2TxMXene-modified碳布不仅使内阻最小化，而且还提高了电活性表面积，表现出优越的导电性。这些特性使其成为生物应用的有利材料。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

期刊介绍： Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies. Electrocatalysis publishes original submissions in the form of letters, research papers, review articles, book reviews, and educational papers. Letters are preliminary reports that communicate new and important findings. Regular research papers are complete reports of new results, and their analysis and discussion. Review articles critically and constructively examine development in areas of electrocatalysis that are of broad interest and importance. Educational papers discuss important concepts whose understanding is vital to advances in theoretical and experimental aspects of electrochemical reactions.