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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...
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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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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...
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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Decoupling Electrolytic Water Splitting by an Oxygen-Mediating Process.

Mingze Xu1, Jianying Wang1, Shi-Gang Sun2

  • 1School of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.

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|November 1, 2024
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Summary
This summary is machine-generated.

This study introduces oxygen-mediating redox mediators (ORMs) for membrane-free water electrolysis, producing high-purity hydrogen. Bismuth oxide (Bi2O3) demonstrates excellent performance, enabling combined energy conversion and storage.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Decoupled water electrolysis offers flexible, high-purity hydrogen production using membrane-free electrolyzers.
  • Effective mediator electrodes with suitable redox potential, capacity, and stability are critical for practical applications.

Purpose of the Study:

  • To introduce a novel concept of oxygen-mediating redox mediators (ORMs) for decoupled water electrolysis.
  • To investigate the performance of Bismuth oxide (Bi2O3) as an ORM material.

Main Methods:

  • Fabrication and electrochemical characterization of Bi2O3 electrodes.
  • Testing of the Bi2O3 electrode in a decoupled alkaline water electrolysis system.
  • Integration with a Bi2O3-Zn battery for combined energy conversion and storage.

Main Results:

  • The Bi2O3 electrode exhibited a reversible specific capacity of 300.8 mA h g-1.
  • Outstanding cycling stability was achieved for over 1000 cycles at 2.0 A g-1.
  • Successful demonstration of power-to-fuel (hydrogen) and chemical-to-power (battery) conversion.

Conclusions:

  • Oxygen-mediating redox mediators offer a competitive route for membrane-free decoupled water splitting.
  • Bi2O3 is a promising material for ORMs, enabling efficient hydrogen production and energy storage.
  • The developed system provides a versatile platform for combined energy transformation and storage applications.