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Reverse Electrodialysis-Assisted Solar Water Splitting.

Jihye Lee1, Jeongse Yun1, Seung-Ryong Kwon1

  • 1Department of Chemistry, Seoul National University, Seoul, 08826, Korea.

Scientific Reports
|September 27, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a novel hybrid system combining solar water splitting with reverse electrodialysis (RED) to enhance efficiency. The integrated system successfully splits water using a silicon photoelectrode and RED stack, eliminating the need for external power sources.

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Area of Science:

  • Renewable Energy Technologies
  • Materials Science for Energy
  • Electrochemistry

Background:

  • Photoelectrochemical (PEC) water splitting is promising for solar energy storage but limited by photoelectrode efficiency and stability.
  • Relaxing photoelectrode band gap requirements is crucial for advancing PEC water splitting.
  • External power sources can supplement limited photoelectrode voltage.

Purpose of the Study:

  • To introduce and demonstrate a novel hybrid system for solar water splitting.
  • To integrate reverse electrodialysis (RED) as a tunable power source in a PEC setup.
  • To enable solar water splitting with greater flexibility in photoelectrode material selection.

Main Methods:

  • Developed a hybrid system combining a single-junction p-Si photoelectrode with a reverse electrodialysis (RED) stack.
  • Utilized the RED stack as both a separator and an auxiliary power source.
  • Operated the hybrid system to achieve solar water splitting without external bias.

Main Results:

  • Successfully enabled solar water splitting using the integrated p-Si and RED system.
  • Demonstrated that the RED stack effectively compensates for the photoelectrode's limited voltage.
  • Showcased the system's ability to operate without external electrical bias.

Conclusions:

  • The hybrid solar water splitting system with RED offers a viable alternative to conventional PEC setups.
  • This approach relaxes constraints on photoelectrode material selection, particularly the band gap requirement.
  • The integration of RED provides a tunable power source, enhancing the overall feasibility of solar energy storage via water splitting.