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Related Concept Videos

Electrolysis03:00

Electrolysis

In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
Resting Membrane Potential01:24

Resting Membrane Potential

The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Processes at Electrodes01:30

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate light...

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An oxygen cathode operating in a physiological solution.

Nicolas Mano1, Hyug-Han Kim, Yongchao Zhang

  • 1Department of Chemical Engineering and the Texas Materials Institute, The University of Texas, Austin, Texas 78712, USA.

Journal of the American Chemical Society
|May 30, 2002
PubMed
Summary
This summary is machine-generated.

This study demonstrates efficient electroreduction of oxygen to water under physiological conditions using a novel immobilized electrocatalyst. The system achieves significant current density and stability, paving the way for advanced electrochemical applications.

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Area of Science:

  • Electrochemistry
  • Biocatalysis
  • Materials Science

Background:

  • Oxygen reduction reaction (ORR) is crucial for energy conversion.
  • Developing efficient and stable electrocatalysts for ORR under physiological conditions remains a challenge.

Purpose of the Study:

  • To report the electroreduction of O(2) to water under physiological conditions.
  • To develop and characterize a novel immobilized electrocatalyst for efficient oxygen reduction.

Main Methods:

  • Immobilization of bilirubin oxidase and a redox copolymer on carbon cloth.
  • Electrochemical characterization of the electrocatalyst under physiological conditions (pH 7.4, 37.5°C).
  • Evaluation of operational stability and current density limits.

Main Results:

  • Achieved electroreduction of O(2) to water at 5 mA cm(-2) and a potential of 0.18 V.
  • The immobilized electrocatalyst demonstrated O(2) transport-limited current density up to 8.8 mA cm(-2).
  • Operational stability showed a decrease from 2.4 mA cm(-2) to 1.3 mA cm(-2) over 6 days at 300 rpm and 37.5°C.

Conclusions:

  • The developed electrocatalyst shows promise for efficient oxygen electroreduction under physiological conditions.
  • Electrode operational life is influenced by rotation speed, affecting current density and catalyst stability.
  • Further optimization is needed to enhance long-term operational stability for practical applications.