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Electrolysis03:00

Electrolysis

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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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Controlled-Potential Coulometry: Electrolytic Methods01:17

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Highly Efficient All-3D-Printed Electrolyzer toward Ultrastable Water Electrolysis.

Xi Xu1,2, Gangwen Fu1,2, Yuxuan Wang1

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Engineered 3D-printed nickel electrodes with unique pore structures enhance electrochemical water splitting. This innovation facilitates efficient hydrogen and oxygen evolution reactions for clean energy production.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Technology

Background:

  • Electrochemical water splitting is crucial for clean energy but hindered by bubble formation and surface blockage.
  • Sluggish kinetics and inefficient bubble management limit performance at high current densities.

Purpose of the Study:

  • To develop 3D-printed nickel electrodes with optimized structures for efficient bubble management in water splitting.
  • To enhance electrode performance by incorporating MoNi4 and NiFe layered double hydroxide active materials.

Main Methods:

  • Fabrication of 3D-printed nickel (3DP Ni) electrodes with designed periodic macro- and microporosity.
  • Loading of 3DP Ni electrodes with MoNi4 and NiFe layered double hydroxide catalysts.
  • Electrochemical testing of electrodes and an all-3D-printed alkaline electrolyzer.

Main Results:

  • The 3DP Ni electrodes exhibited fast bubble evolution and emission due to macroscopic pores and high electrochemically active surface area from microporosity.
  • Achieved low overpotentials: 104 mV for hydrogen evolution reaction (HER) and 310 mV for oxygen evolution reaction (OER) at 500 mA cm⁻².
  • An all-3D-printed alkaline electrolyzer operated at 1.63 V for 500 mA cm⁻² with stable performance over 1000 hours.

Conclusions:

  • Tailored bubble management in 3D-printed electrodes offers a viable solution for efficient electrochemical water splitting.
  • The developed technology shows promise for scalable clean energy production through advanced electrolyzer design.