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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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Energy-Efficient Seawater Lithium Extraction via a Reversible Redox-Hydrogen Coupled System.

Yigang Wang1, Sixie Yang1,2, Yiwen Liu1

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This study presents a novel electrochemical system for efficient lithium extraction from seawater, simultaneously producing energy and hydrogen. This sustainable method unlocks vast ocean lithium reserves, enhancing energy security.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Growing global lithium demand challenges supply security and sustainability.
  • Seawater contains vast lithium reserves but is difficult to access due to low concentrations and competing ions.

Purpose of the Study:

  • To develop an integrated electrochemical system for direct lithium extraction from seawater.
  • To couple lithium extraction with in situ energy storage and hydrogen co-production.
  • To create a sustainable and practical method for utilizing seawater as a lithium resource.

Main Methods:

  • An electrochemical system using a reversible Ni(OH)2/NiOOH redox electrode for energy storage.
  • A Zn-NiOOH battery configuration for on-demand energy recovery.
  • A NiS2/MoS2 catalyst to reduce hydrogen evolution overpotential.

Main Results:

  • Generated approximately 807 mL of hydrogen gas per gram of lithium extracted.
  • Reduced net energy consumption to 6.40 Wh/gLi.
  • Upgraded seawater from 0.183 mg/L Li+ to 306.2 mg/L Li+ and lowered the Mg/Li ratio by seven orders of magnitude.

Conclusions:

  • The developed system offers a practical and sustainable route for lithium extraction from seawater.
  • This approach enhances energy security by unlocking a vast, previously untapped lithium resource.
  • The integrated system demonstrates efficient energy storage and hydrogen co-production alongside lithium recovery.