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Microalgae-Based Hybrid Biophotoelectrode for Efficient Light Energy Conversion.

Caio C G Silva1,2, Guilherme Martins1, André Luís1

  • 1Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal.

ACS Electrochemistry
|July 10, 2025
PubMed
Summary
This summary is machine-generated.

This study developed a hybrid biophotoelectrode using microalgae and WO3 for sustainable energy. The novel electrode enhances electron transfer, enabling efficient CO2 conversion to formate using light.

Keywords:
CO2 reductionbiophotoelectrochemical deviceshybrid catalystsmicroalgaepolydopamine

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Electrochemistry

Background:

  • Photosynthetic microorganisms offer potential for sustainable energy via photobio-electrochemical systems.
  • Integrating microalgae into electrodes is difficult due to cell complexity and low electron transfer rates.

Purpose of the Study:

  • To develop a hybrid biophotoelectrode integrating microalgae with a WO3 semiconductor electrode.
  • To enhance cell entrapment and charge transfer for improved electrochemical communication.

Main Methods:

  • Fabrication of a hybrid biophotoelectrode using intact microalgae, WO3, and polydopamine.
  • Characterization of photocurrent generation under visible light.
  • Investigation of electron flow and electrode performance.
  • Assembly of a biophoto-electrochemical cell for CO2 conversion.

Main Results:

  • The hybrid biophotoelectrode achieved photocurrents up to 24 μA cm-2 under low light intensity (<6.0 mW cm-2).
  • Immobilized microalgae significantly contributed to the overall photocurrent.
  • A proof-of-concept biophoto-electrochemical cell converted CO2 to formate using the microalgae electrode and a biocathode.

Conclusions:

  • The study demonstrates a viable strategy for integrating microalgae into electrodes for photobio-electrochemical applications.
  • This approach facilitates efficient CO2 conversion into valuable chemicals, powered by light.
  • Findings advance understanding of photosynthetic cell-electrode interactions for novel bio-electrochemical device development.