We study the isothermal hydrogen adsorption and reaction at the E-TEK electrode of a polymer electrolyte fuel cell with a Nafion 117 membrane by impedance spectroscopy at 30 degrees C. We find that the impedance diagram must include a Gerischer phase element. Constant phase elements are not sufficient to describe the experimental data. This means that an adsorption reaction takes place in combi...

Experimental data for electron exchange between two electrodes covered by electroactive films are presented and discussed in terms of the Gerischer model. A model Hamiltonian is proposed for such indirect electron exchange involving two intermediate species. Explicit model calculations are performed for the case in which the coupling between the two adsorbates is weak and determines the overall...

The effect of the thickness of ceramic membrane on the productivity of microbial fuel cells (MFCs) was investigated with respect to the electricity generation and domestic wastewater treatment efficiencies. The thickest ceramic membrane (9 mm) gained the highest coulombic efficiency (27.58±4.2 %), voltage (681.15±33.1 mV), and current and power densities (447.11±21.37 mA/m2, 63.82±10.42 mW/m2) ...

Electrochemical electron transfer reactions are reviewed, starting with the works of Marcus and Hush, who evolved the concept of solvent reorganization. The resulting equations for the electrochemical rate constants are derived, and interpreted within the Gerischer formulation. A quantum mechanical version points out the importance of the electronic interaction between reactant and electrode, a...

The electrochemical reactions of hydrogen oxidation and steam reduction have been investigated for a porous cermet electrode made Ni 3YSZ. characterizations performed over large range gas compositions at 700°C. It has shown that the fuel response is activated by potential under anodic current while limiting density appears cathodic polarization. Moreover, impedance diagrams exhibit shape repres...

In this work, we explore how electrochemical tunneling reactions can be understood within the single-particle picture. That is, formal approach in which band diagrams are typically utilized to understand electronic processes solid-state materials and devices. This perspective is based upon Gerischer–Hopfield description of electron transfer at solid–liquid interfaces. Both single multiple discu...

Developing sustainable and clean energy technology is critial to address the current environmental crisis. As an carrier, hydrogen has been getting attention due its abundance, high density, zero carbon emission. Due difficulty of storage transport, electro-oxidation ammonia shows great potential for renewable since it satisfies both supply protection as a carbon-free fuel with content. However...

Ammonia electro-oxidation is an extremely significant reaction with regards to the nitrogen cycle, hydrogen economy, and wastewater remediation. The design of efficient electrocatalysts for use in ammonia (AOR) requires comprehensive understanding mechanism intermediates involved. In this study, aggregation-induced emission (AIE), a robust fluorescence sensing platform, employed sensitive quali...