{"title":"用于微生物燃料电池碳纱阳极的生物催化剂:前驱体和催化剂负载对整体性能的影响","authors":"Karnapa Ajit, Juliana John, Haribabu Krishnan","doi":"10.1016/j.electacta.2024.145296","DOIUrl":null,"url":null,"abstract":"Biocatalysts in anodes have been crucial in improving microbial fuel cell (MFC) performance. Biocatalysts derived from biomass such as coconut wood sawdust (SD-B) and pepper processing residue (PS-B), were used to improve the electrocatalytic properties of Carbon Veil (CV) electrodes. The amorphous graphitic carbon biocatalyst with a mesoporous structure was found to have a surface area of 889.31 m<sup>2</sup>/g for SD-B and 763.56 m<sup>2</sup>/g for PS-B. Surface functional groups such as -OH which imparts hydrophilicity and -C=O and COOH which promotes bacterial compatibility have been revealed to be present in both catalysts. Catalyst loading played a major role and at an optimal loading of 2 mg/cm<sup>2</sup>, the electrodes exhibited maximum electrocatalytic activity in the case of both biocatalysts. The voltammetric capacitances of SD-B and PS-B modified electrodes were 191.6 mF/cm<sup>2</sup> and 106.6 mF/cm<sup>2</sup> demonstrating their pseudocapacitive behaviour too. The performance of MFC with SD-B revealed a maximum power density of 10.1 W/m<sup>3</sup> (Open Circuit Voltage (OCV) of 850 mV), followed by PS-B at 6.89 W/m<sup>3</sup> (OCV of 825 mV) whereas the plain CV was at 0.168 W/m<sup>3</sup> (OCV of 760 mV). Anode polarization studies indicated reduced slopes for biocatalyst-modified anodes, signifying improved electrode kinetics, particularly notable in the SD-B modified MFC where the cathode became the limiting electrode. Coulombic efficiencies of the biocatalyst-modified MFCs increased to 54.50%, (SD-B 2 mg/cm<sup>2</sup>) and 37.78% (PS-B 2 mg/cm<sup>2</sup>) respectively from 12.74% as noticed in the case of unmodified MFC. This study emphasizes the potential of biocatalysts as a simple and low-cost means of enhancing the anode properties – porosity, conductivity, hydrophilicity, and biocompatibility.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":5.5000,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Biocatalyst for Carbon Veil anode in Microbial Fuel Cells: The effect of precursor and catalyst loading on overall performance\",\"authors\":\"Karnapa Ajit, Juliana John, Haribabu Krishnan\",\"doi\":\"10.1016/j.electacta.2024.145296\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Biocatalysts in anodes have been crucial in improving microbial fuel cell (MFC) performance. Biocatalysts derived from biomass such as coconut wood sawdust (SD-B) and pepper processing residue (PS-B), were used to improve the electrocatalytic properties of Carbon Veil (CV) electrodes. The amorphous graphitic carbon biocatalyst with a mesoporous structure was found to have a surface area of 889.31 m<sup>2</sup>/g for SD-B and 763.56 m<sup>2</sup>/g for PS-B. Surface functional groups such as -OH which imparts hydrophilicity and -C=O and COOH which promotes bacterial compatibility have been revealed to be present in both catalysts. Catalyst loading played a major role and at an optimal loading of 2 mg/cm<sup>2</sup>, the electrodes exhibited maximum electrocatalytic activity in the case of both biocatalysts. The voltammetric capacitances of SD-B and PS-B modified electrodes were 191.6 mF/cm<sup>2</sup> and 106.6 mF/cm<sup>2</sup> demonstrating their pseudocapacitive behaviour too. The performance of MFC with SD-B revealed a maximum power density of 10.1 W/m<sup>3</sup> (Open Circuit Voltage (OCV) of 850 mV), followed by PS-B at 6.89 W/m<sup>3</sup> (OCV of 825 mV) whereas the plain CV was at 0.168 W/m<sup>3</sup> (OCV of 760 mV). Anode polarization studies indicated reduced slopes for biocatalyst-modified anodes, signifying improved electrode kinetics, particularly notable in the SD-B modified MFC where the cathode became the limiting electrode. Coulombic efficiencies of the biocatalyst-modified MFCs increased to 54.50%, (SD-B 2 mg/cm<sup>2</sup>) and 37.78% (PS-B 2 mg/cm<sup>2</sup>) respectively from 12.74% as noticed in the case of unmodified MFC. This study emphasizes the potential of biocatalysts as a simple and low-cost means of enhancing the anode properties – porosity, conductivity, hydrophilicity, and biocompatibility.\",\"PeriodicalId\":305,\"journal\":{\"name\":\"Electrochimica Acta\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.5000,\"publicationDate\":\"2024-10-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Electrochimica Acta\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1016/j.electacta.2024.145296\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ELECTROCHEMISTRY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electrochimica Acta","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.electacta.2024.145296","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ELECTROCHEMISTRY","Score":null,"Total":0}
Biocatalyst for Carbon Veil anode in Microbial Fuel Cells: The effect of precursor and catalyst loading on overall performance
Biocatalysts in anodes have been crucial in improving microbial fuel cell (MFC) performance. Biocatalysts derived from biomass such as coconut wood sawdust (SD-B) and pepper processing residue (PS-B), were used to improve the electrocatalytic properties of Carbon Veil (CV) electrodes. The amorphous graphitic carbon biocatalyst with a mesoporous structure was found to have a surface area of 889.31 m2/g for SD-B and 763.56 m2/g for PS-B. Surface functional groups such as -OH which imparts hydrophilicity and -C=O and COOH which promotes bacterial compatibility have been revealed to be present in both catalysts. Catalyst loading played a major role and at an optimal loading of 2 mg/cm2, the electrodes exhibited maximum electrocatalytic activity in the case of both biocatalysts. The voltammetric capacitances of SD-B and PS-B modified electrodes were 191.6 mF/cm2 and 106.6 mF/cm2 demonstrating their pseudocapacitive behaviour too. The performance of MFC with SD-B revealed a maximum power density of 10.1 W/m3 (Open Circuit Voltage (OCV) of 850 mV), followed by PS-B at 6.89 W/m3 (OCV of 825 mV) whereas the plain CV was at 0.168 W/m3 (OCV of 760 mV). Anode polarization studies indicated reduced slopes for biocatalyst-modified anodes, signifying improved electrode kinetics, particularly notable in the SD-B modified MFC where the cathode became the limiting electrode. Coulombic efficiencies of the biocatalyst-modified MFCs increased to 54.50%, (SD-B 2 mg/cm2) and 37.78% (PS-B 2 mg/cm2) respectively from 12.74% as noticed in the case of unmodified MFC. This study emphasizes the potential of biocatalysts as a simple and low-cost means of enhancing the anode properties – porosity, conductivity, hydrophilicity, and biocompatibility.
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.