Papers by Keyword: Biofuel Cell

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Authors: Jaroslav Filip, Jana Šefčovičová, Peter Gemeiner, Jan Tkac
Abstract: An electrode interface was prepared using a mixture of a cheap carbon nanomaterial KetjenBlack (KB) and carbon nanotubes (CNT) dispersed in a biopolymer chitosan. Bilirubin oxidase (BOD) was proved to adsorb effectively on such a nanointerface, retaining its catalytic activity for reduction of dioxygen to water, which was proved by cyclic voltammetry. Moreover, three distinct cathodic redox reactions were determined in the absence of oxygen, suggesting that KB/CNT template provides a suitable micro and nanoporosity for direct electron transfer between BOD and the modified electrodes revealing all three known active sites of BOD. Furthermore, BOD was adsorbed on graphene oxide with subsequent electrochemical reduction of graphene oxide into a conductive graphene film with BOD trapped within the matrix. Two active sites of BOD were observed on the electrode modified by graphene suggesting the enzyme is oriented in a different way compared to the KB/CNT nanointerface due to changes in the nature of functional groups within the nanocomposite, changed porosity of the nanointerface or as a result of electrochemical perturbation of the matrix during reduction of graphene oxide. A more detailed fundamental investigation of the influence of the nanointerface matrix on an adsorption and orientation of BOD will without any doubt allow us to tailor ability of such composites to reduce dioxygen to water with high efficiency, what is a feature important for construction of robust and effective biocathodes of enzymatic biofuel cells.
Authors: Franz Moraw, Khalid Fatih, David Wilkinson, François Girard
Abstract: The use of redox fuel cells, in which oxygen is replaced by other oxidants such as ferric ions, can have significant advantages. The redox fuel cell can achieve high efficiencies and has other fuel cell advantages. Bioregeneration is one method of creating a closed cathode system with efficient catholyte regeneration. In the work discussed here, a Fe3+/Fe2+ redox simulated bio-electrolyte catholyte is characterized over a range of electrolyte concentrations and fuel cell operating conditions using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).
Authors: Jian Mei Zhang, Yi Hua Zhu, Jie Ping Yun, Xiao Ling Yang, Chun Zhong Li
Abstract: In this paper, a method of carbon nanotube coated with the dendrimer encapsulated platinum nanoparticles(Pt-DENs/CNTs) was introduced, and the properties of enzyme electrode modified by the Pt-DENs/CNTs were investigated. The formation of the self-assembled (GOx/Pt-DENs)n/CNTs construction was expiored by high resolution transmission electron microscopy (HRTEM). And the results indicated that the uniform growth of the layer-by-layer nanostructures onto carboxyl-functionalized CNTs. The electrochemical properties of the enzyme anode modified by (GOx/Pt-DENs)n/CNTs, which act as biofuel cell anode, was studied by electrochemica measurements. Owing to its nanostructure, the (GOx/Pt-DENs)n/CNTs heterostructures have a large specific area, a high surface active center, good conductivity and macro tunnel effect, therefore the electrode modified by (GOx/Pt-DENs)n/CNTs has series of attractive electrochemical characteristics so as to enhance biofuel cell’s function.
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