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In Situ Transformed Organic Redox Molecules for a Hydrogen Battery Operated at -70 °C.

Xiang Chu1,2, Zaichun Liu1,2, Hengjie Liu3

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This study introduces a green electrochemical synthesis for 1,2-Naphthoquinone (1,2-NQ) for high-performance hydrogen batteries. The new method enables sustainable energy storage with excellent capacity and cycle life, even at low temperatures.

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aqueous proton batteryhigh areal capacityhydrogen gas batterylong cycling lifelow-temperature operationorganic cathode

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Rechargeable hydrogen batteries require sustainable and safe organic materials for large-scale energy storage.
  • 1,2-Naphthoquinone (1,2-NQ) offers high theoretical capacity for hydrogen batteries via a reversible enolization reaction.
  • Current 1,2-NQ synthesis involves costly catalysts and toxic solvents, hindering its practical application.

Purpose of the Study:

  • To develop a green and economical in situ electrochemical synthesis of 1,2-NQ from 2-nitro-1-naphthol (2N1N).
  • To evaluate the performance of 1,2-NQ synthesized via this method in hydrogen batteries.
  • To demonstrate the potential of this approach for practical, large-scale energy storage solutions.

Main Methods:

  • Electrochemical in situ transformation of 2-nitro-1-naphthol (2N1N) to 1,2-Naphthoquinone (1,2-NQ).
  • Operando synchrotron radiation Fourier transformed infrared (SR-FTIR) spectroscopy for structural characterization.
  • Performance testing of NQ-H2 batteries, including specific capacity, cycle life, and low-temperature performance.

Main Results:

  • The NQ-H2 battery achieved a high specific capacity of 323.4 mAh g-1 at 0.2 A g-1, close to the theoretical limit.
  • Demonstrated exceptional stability with 10,000 cycles at 10 A g-1.
  • Maintained a capacity of 155.9 mAh g-1 at -70 °C.
  • A prototype NQ-H2 pouch cell showed an expanded capacity of 375.4 mAh and high areal capacity (6.3 mAh cm-2).

Conclusions:

  • A green and economical electrochemical synthesis of 1,2-NQ from 2N1N is feasible for high-performance hydrogen batteries.
  • The synthesized 1,2-NQ enables sustainable energy storage with excellent capacity, stability, and low-temperature performance.
  • This strategy offers a viable pathway for practical applications of sustainable hydrogen battery chemistry.