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Islam J, Obulisamy PK, Upadhyayula VKK, Dalton AB, Ajayan PM, Rahman MM, Tripathi M, Sani RK, Gadhamshetty V. Graphene as Thinnest Coating on Copper Electrodes in Microbial Methanol Fuel Cells. ACS NANO 2023; 17:137-145. [PMID: 36535017 DOI: 10.1021/acsnano.2c05512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Dehydrogenation of methanol (CH3OH) into direct current (DC) in fuel cells can be a potential energy conversion technology. However, their development is currently hampered by the high cost of electrocatalysts based on platinum and palladium, slow kinetics, the formation of carbon monoxide intermediates, and the requirement for high temperatures. Here, we report the use of graphene layers (GL) for generating DC electricity from microbially driven methanol dehydrogenation on underlying copper (Cu) surfaces. Genetically tractable Rhodobacter sphaeroides 2.4.1 (Rsp), a nonarchetypical methylotroph, was used for dehydrogenating methanol at the GL-Cu surfaces. We use electrochemical methods, microscopy, and spectroscopy methods to assess the effects of GL on methanol dehydrogenation by Rsp cells. The GL-Cu offers a 5-fold higher power density and 4-fold higher current density compared to bare Cu. The GL lowers charge transfer resistance to methanol dehydrogenation by 4 orders of magnitude by mitigating issues related to pitting corrosion of underlying Cu surfaces. The presented approach for catalyst-free methanol dehydrogenation on copper electrodes can improve the overall sustainability of fuel cell technologies.
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Affiliation(s)
- Jamil Islam
- Department Civil and Environmental Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, United States
- BuGReMeDEE Consortium, South Dakota School of Mines and Technology, 501 E St Joseph St, Rapid City, South Dakota 57701, United States
| | - Parthiba Karthikeyan Obulisamy
- Department Civil and Environmental Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, United States
- BuGReMeDEE Consortium, South Dakota School of Mines and Technology, 501 E St Joseph St, Rapid City, South Dakota 57701, United States
| | | | - Alan B Dalton
- Department of Physics and Astronomy, University of Sussex, Brighton BN1 9RH, United Kingdom
| | - Pulickel M Ajayan
- Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
| | - Muhammad M Rahman
- Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
| | - Manoj Tripathi
- Department of Physics and Astronomy, University of Sussex, Brighton BN1 9RH, United Kingdom
| | - Rajesh Kumar Sani
- Department Civil and Environmental Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, United States
- BuGReMeDEE Consortium, South Dakota School of Mines and Technology, 501 E St Joseph St, Rapid City, South Dakota 57701, United States
- 2Dimensional Materials for Biofilm Engineering Science and Technology (2DBEST) Center, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, United States
| | - Venkataramana Gadhamshetty
- Department Civil and Environmental Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, United States
- BuGReMeDEE Consortium, South Dakota School of Mines and Technology, 501 E St Joseph St, Rapid City, South Dakota 57701, United States
- 2Dimensional Materials for Biofilm Engineering Science and Technology (2DBEST) Center, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, United States
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Guette-Marquet S, Basseguy R, Roques C, Bergel A. The electrochemical potential is a key parameter for cell adhesion and proliferation on carbon surface. Bioelectrochemistry 2022; 144:108045. [PMID: 35016068 DOI: 10.1016/j.bioelechem.2021.108045] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/26/2021] [Accepted: 12/22/2021] [Indexed: 01/05/2023]
Abstract
The Nernst potential of the support/cell interface is suspected to play a key role in cell adhesion and proliferation. However, the studies that have addressed this topic have generally varied the electrochemical potential of the interface by comparing different materials or by varying the chemical composition of the surface coating. It is consequently hard to definitively separate the actual effect of the potential from possible side-effects due to differences in the surface composition or topography. Here, a 3-electrode set-up was used to apply different values of potential to identical carbon electrodes. Potentials were applied in the range -200 to 400 mV vs. silver pseudo-reference (SPR), i.e. 90 to 690 mV/SHE, to screen-printed carbon electrodes used to grow Vero or Raw 264.7 cell lines. Values up to 200 mV/SPR prohibited cell adhesion and even caused detachment of cells that were previously adhered. The value of 400 mV/DRP allowed cell adhesion and proliferation, leading to confluent and sometimes very compact mats. The zero charge potential, measured around 200 mV/DRP, showed that the drastic effect of the applied potential was probably due to the negative/positive switch of the surface charge.
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Affiliation(s)
- Simon Guette-Marquet
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Faculté des Sciences Pharmaceutiques, 35 chemin des maraîchers, 31062 Toulouse cedex 4, France
| | - Régine Basseguy
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, 4 allée Emile Monso, 31432 Toulouse, France
| | - Christine Roques
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Faculté des Sciences Pharmaceutiques, 35 chemin des maraîchers, 31062 Toulouse cedex 4, France
| | - Alain Bergel
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, 4 allée Emile Monso, 31432 Toulouse, France.
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Champigneux P, Delia ML, Bergel A. Impact of electrode micro- and nano-scale topography on the formation and performance of microbial electrodes. Biosens Bioelectron 2018; 118:231-246. [PMID: 30098490 DOI: 10.1016/j.bios.2018.06.059] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Revised: 06/25/2018] [Accepted: 06/27/2018] [Indexed: 02/05/2023]
Abstract
From a fundamental standpoint, microbial electrochemistry is unravelling a thrilling link between life and materials. Technically, it may be the source of a large number of new processes such as microbial fuel cells for powering remote sensors, autonomous sensors, microbial electrolysers and equipment for effluent treatment. Microbial electron transfers are also involved in many natural processes such as biocorrosion. In these contexts, a huge number of studies have dealt with the impact of electrode materials, coatings and surface functionalizations but very few have focused on the effect of the surface topography, although it has often been pointed out as a key parameter impacting the performance of electroactive biofilms. The first part of the review gives an overview of the influence of electrode topography on abiotic electrochemical reactions. The second part recalls some basics of the effect of surface topography on bacterial adhesion and biofilm formation, in a broad domain reaching beyond the context of electroactivity. On these well-established bases, the effect of surface topography is reviewed and analysed in the field of electroactive biofilms. General trends are extracted and fundamental questions are pointed out, which should be addressed to boost future research endeavours. The objective is to provide basic guidelines useful to the widest possible range of research communities so that they can exploit surface topography as a powerful lever to improve, or to mitigate in the case of biocorrosion for instance, the performance of electrode/biofilm interfaces.
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Affiliation(s)
- Pierre Champigneux
- Laboratoire de Génie Chimique, CNRS, Université de Toulouse (INPT), 4 allée Emile Monso, 31432 Toulouse, France
| | - Marie-Line Delia
- Laboratoire de Génie Chimique, CNRS, Université de Toulouse (INPT), 4 allée Emile Monso, 31432 Toulouse, France
| | - Alain Bergel
- Laboratoire de Génie Chimique, CNRS, Université de Toulouse (INPT), 4 allée Emile Monso, 31432 Toulouse, France.
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Champigneux P, Renault-Sentenac C, Bourrier D, Rossi C, Delia ML, Bergel A. Effect of surface nano/micro-structuring on the early formation of microbial anodes with Geobacter sulfurreducens: Experimental and theoretical approaches. Bioelectrochemistry 2018; 121:191-200. [DOI: 10.1016/j.bioelechem.2018.02.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 02/03/2018] [Accepted: 02/10/2018] [Indexed: 12/24/2022]
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