Role of cadmium gallate nanoparticles on the cathode of microbial fuel cells for enhanced bioelectricity production

IF 2.4 4区化学 Q3 CHEMISTRY, PHYSICAL Ionics Pub Date : 2024-07-30 DOI:10.1007/s11581-024-05727-7

Mohit Sahni, Ankit Kumar, Pankaj Gupta, Azmat Ali Khan, Abhilasha Singh Mathuriya, Soumya Pandit, Kuldeep Sharma, Amit Roy, Nishant Ranjan, M. Z. A. Yahya, I. M. Noor

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Abstract

Bringing microbial fuel cells (MFCs) to market requires the use of non-precious metal catalysts. Therefore, we replaced the platinum (Pt) cathode with more cost-effective cadmium gallate (CdGa2O4) nanoparticles in the present research. The synthesis and characterization of cadmium gallate (CdGa₂O₄), and further its application as a cathode catalyst for oxygen reduction reaction (ORR) in a MFC. The physiochemical characterization indicates a high ORR property of CdGa₂O₄, attributed to the presence of active sites, high electronic conductivity, and high surface area. These features enhanced the bioelectricity production with simultaneous wastewater treatment which resulted into comparable performances to catalysts such as platinum (Pt). The electrochemical analysis shows that the loading rate of CdGa₂O₄ has a significant impact on the power output of the MFC. The highest volumetric power density was observed in CdGa₂O₄ with a loading of 1 mg/cm³ (8.2 W/m³). COD removal efficiency also showed a similar trend with respect to different loading rates. 1 mg/cm³ of CdGa₂O₄ showed the highest COD removal and Columbic efficiency of 83.8% and 11.7%, respectively. The low cost-to-performance ratio, high ORR activity, and high electric conductivity of CdGa₂O₄ prove that CdGa₂O₄ is a feasible substitute for Pt in large-scale operations of MFC.

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没食子酸镉纳米颗粒在微生物燃料电池阴极上对提高生物发电量的作用

将微生物燃料电池（MFC）推向市场需要使用非贵金属催化剂。因此，在本研究中，我们用更具成本效益的没食子酸镉（CdGa2O4）纳米颗粒取代了铂（Pt）阴极。我们合成并表征了没食子酸镉（CdGa2O4），并进一步将其用作 MFC 中氧还原反应（ORR）的阴极催化剂。理化特性分析表明，CdGa2O4 具有较高的 ORR 特性，这归功于活性位点的存在、高电子传导性和高表面积。这些特性提高了生物发电量，并同时处理了废水，使其性能与铂（Pt）等催化剂相当。电化学分析表明，CdGa2O4 的负载率对 MFC 的功率输出有显著影响。当 CdGa2O4 的负载量为 1 mg/cm3 时，体积功率密度最高（8.2 W/m3）。COD 去除效率也呈现出与不同负载率类似的趋势。1 mg/cm3 CdGa2O4 的 COD 去除率和哥伦布效率最高，分别为 83.8% 和 11.7%。CdGa2O4 的低成本性能比、高 ORR 活性和高导电性证明，在大规模运行的 MFC 中，CdGa2O4 是一种可行的铂替代品。

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.