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Microenvironment-Engineered Multilayered Electrode Design for Sustainable Seawater Oxidation.

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Summary
This summary is machine-generated.

This study presents a novel multilayered electrode for direct seawater electrolysis, overcoming corrosion and fouling challenges. The design enables efficient, sustainable hydrogen production from seawater without desalination.

Keywords:
Direct seawater electrolysisLewis BaseOERmicroenvironment engineeringmultilayered electrode design

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • High-purity water reliance for hydrogen production strains freshwater resources.
  • Direct seawater electrolysis faces challenges like chloride corrosion and electrode fouling.
  • Developing stable and efficient seawater electrolysis is crucial for sustainable hydrogen generation.

Purpose of the Study:

  • To present a microenvironment-engineered, multilayered electrode for sustainable direct seawater electrolysis.
  • To address chloride-induced corrosion and electrode fouling in saline environments.
  • To enhance the efficiency and stability of hydrogen production from seawater.

Main Methods:

  • Fabrication of a multilayered electrode using Cobalt layered double hydroxides (Co LDH) and NiBOx nanostructures on a Ni(OH)2/NF microarray.
  • Integration of carbonate (CO₃²⁻) Lewis base sites onto Cobalt active sites.
  • Incorporation of boron into the Ni-OOH matrix to form a protective metaborate film.

Main Results:

  • The electrode design demonstrated enhanced corrosion resistance in saline conditions due to a protective metaborate film.
  • Localized acidic microenvironments were generated, improving oxygen evolution reaction (OER) kinetics and preventing chloride attack.
  • The anode achieved an industrially relevant current density of 1.0 A cm⁻² at 1.65 V, showcasing high efficiency and stability.

Conclusions:

  • The microenvironment-engineered electrode design offers a viable solution for stable and efficient direct seawater electrolysis.
  • This advancement paves the way for scalable, desalination-free hydrogen production directly from seawater.
  • The developed electrode technology significantly contributes to sustainable energy solutions by utilizing abundant seawater resources.