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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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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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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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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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Related Experiment Video

Updated: Nov 26, 2025

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
13:29

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All-in-One, Solid-State, Solar-Powered Electrochemical Cell.

Yu Zhao1, Chenyang Li1, Fanxin Song1

  • 1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren'ai Road, Suzhou 215123, Jiangsu, PR China.

ACS Applied Materials & Interfaces
|December 10, 2020
PubMed
Summary

This study presents a novel solid-state solar-powered electrochemical cell (SPEC) using a hydrogel electrolyte. This innovation offers a safer, more cost-effective alternative to traditional liquid electrolyte SPECs.

Keywords:
charge-transfer dynamicselectrochemical cellenergy storage and conversionhydrogelinterface engineering

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Solar-powered electrochemical cells (SPECs) offer a solution to solar power intermittency.
  • Current SPECs often use hazardous liquid electrolytes and require complex packaging, limiting applications and increasing costs.

Purpose of the Study:

  • To develop an all-in-one, solid-state SPEC with improved safety and reduced fabrication costs.
  • To enhance the performance of SPECs through interfacial engineering.

Main Methods:

  • Fabrication of a solid-state SPEC using FTO/BiVO4 photoanode and FTO/Prussian blue anode.
  • Utilization of a LiBr/polyacrylamide (PAM) hydrogel as a multifunctional electrolyte, mediator, and separator.
  • Characterization of the SPEC's performance under AM 1.5 G irradiation.

Main Results:

  • Achieved a solar-to-output energy conversion efficiency of approximately 2.8%.
  • The solid-state PAM hydrogel facilitated charge transfer at the photoanode interface.
  • Suppressed undesirable side reactions, such as electrolyte decomposition.

Conclusions:

  • The developed solid-state SPEC demonstrates a viable and efficient alternative to liquid electrolyte systems.
  • Interfacial engineering with solid-state hydrogels is a promising strategy for high-performance SPEC development.
  • This approach enhances safety and reduces the cost of solar energy conversion devices.