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Electrolysis03:00

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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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Batteries and Fuel Cells03:12

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Voltammetric Techniques: Pulse Voltammetry01:17

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Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
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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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High Pulsed Voltage Alkaline Electrolysis for Water Splitting.

Matías Albornoz1, Marco Rivera1,2, Patrick Wheeler2

  • 1Department of Electrical Engineering, Faculty of Engineering, Campus Curicó, Universidad de Talca, Merced 437, Curicó 3341717, Chile.

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High-voltage pulsed electrolysis, enabled by advanced power converters, shows promise for efficient water splitting. This method, utilizing pulsed plasmolysis, offers a viable route for hydrogen production.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Power Electronics

Background:

  • Advances in solid-state semiconductor devices have spurred interest in pulsed electrolysis.
  • New power converter technologies allow for simpler, efficient, and cost-effective high-voltage and high-frequency systems.

Purpose of the Study:

  • Investigate high-voltage pulsed electrolysis.
  • Analyze the impact of power converter parameters and cell configuration on the process.
  • Evaluate the potential of pulsed plasmolysis for hydrogen production.

Main Methods:

  • Conducted experiments on high-voltage pulsed electrolysis.
  • Varied power converter parameters: frequency (10 Hz to 1 MHz), voltage (2 V to 500 V).
  • Modified cell configuration: electrode separation (0.1 to 2 mm).

Main Results:

  • Demonstrated feasibility of pulsed electrolysis across a wide range of frequencies and voltages.
  • Observed significant effects of electrode separation on electrolysis efficiency.
  • Identified optimal operating windows for pulsed electrolysis.

Conclusions:

  • Pulsed electrolysis is a viable and promising technology for water decomposition.
  • Pulsed plasmolysis presents an effective method for sustainable hydrogen production.
  • Further research into optimizing cell design and power electronics is warranted.