Nanopalladium catalysts can be synthesized by the precipitation of palladium (Pd) on the surface of bacteria leading to the production of biogenic Pd nanoparticles (bio-Pd). For example, Shewanella oneidensis can reduce Pd(II) and subsequently precipitate it as Pd(0) nanocrystals on their cell wall and in their periplasmic space when a hydrogen donor is provided (De Windt et al., 2005). No expe...

Fluorinated quaternary ammonium-containing polymers were used as catalyst binders in microbial fuel cell (MFC) cathodes. The performance of the cathodes was examined and compared to NAFION and other sulfonated aromatic cathode catalyst binders using linear sweep voltammetry (LSV), impedance spectroscopy, and performance tests in single chamber air-cathode MFCs. The cathodes with quaternary ammo...

Electrochemical conversion of CO2 into fuels or chemical feedstocks is one the most promising methods for solving problems both fossil fuel depletion and global warming. Herein, we report...

In this work, we investigated the influence of catalyst supports, particularly Brunauer, Emmett, and Teller (BET) surface area support materials, on membrane electrode assembly (MEA) performance. Keeping anode layer (CL), membrane, Pt loading, operating condition unchanged, prepared cathode CLs using catalysts identical content (30 wt% Pt) which were supported carbon black materials having diff...

Microbial electrolysis cells (MECs) are often examined for hydrogen production using nonsustainable phosphate buffered solutions (PBS), although carbonate buffers have been shown to work in other bioelectrochemical systems with a platinum (Pt) catalyst. Stainless steel (SS) has been shown to be an effective catalyst for hydrogen evolution in MECs, but it has not been tested with carbonate buffe...

The hydroxide-exchange-membrane water electrolyzer (HEMWE) is a promising means to store intermittent renewable energy in the form of hydrogen chemical energy. hydroxide-exchange ionomer (HEI) gas-evolving electrodes and membrane (HEM) are key components HEMWE. In this work, we simulate cell examine explicitly impact HEI HEM properties with focus on improving HEMWE performance when operated dis...

A characterization of the ionic conduction of the active layer of a polymer electrolyte membrane fuel cell ~PEMFC! cathode by ac impedance measurement at open-circuit potential conditions was conducted. Porous electrode theory was used to derive a compact equation, ]2F& 2 /]y 1 ] ln f(y)/]y 3 ]F& 2 /]y 2 R/ f (y)(1 1 jV)F& 2 5 0, to solve for the impedance response of a cathode at open-circuit ...

Various models have been devoted to the operation mechanism of porous diffusion electrodes. They are, however, suffering from the lack of accuracy concerning the acid-film thickness on which they are based. In the present paper the limiting current density has been measured for oxygen reduction on polytetrafluorine-ethyl bonded gas-diffusion electrodes in phosphoric acid with and without fluori...

A new three-dimensional numerical model of a polymer electrolyte fuel cell (PEFC) with single straight channel was developed to primarily investigate the important impact double-sided microporous layer (MPL) coating on overall performance and distribution current oxygen concentration within cathode gas diffusion layers (GDLs). Realistic experimentally estimated interfacial contact resistance va...