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Related Concept Videos

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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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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Synergistic A-Site Compensation and Oxygen Vacancy Engineering Boost High-Entropy Electrolyte Performance in Protonic

Xiaolin Xiang1, Junmeng Jing2, Haoran Wang1

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High-entropy perovskite oxides (HEPOs) offer stable proton-conducting electrolytes for protonic ceramic fuel cells (PCFCs). This new HEPO material demonstrates excellent performance and durability in challenging conditions.

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Pr-dopedconductivityhigh-entropy perovskite oxide (HEPO)protonic ceramic fuel cells (PCFCs)stability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Protonic ceramic fuel cells (PCFCs) are advanced energy devices requiring stable, efficient proton-conducting electrolytes.
  • Extreme environments (moisture, acidic gases) pose significant challenges to PCFC electrolyte performance and durability.

Purpose of the Study:

  • To develop a novel high-entropy perovskite oxide (HEPO) material for proton-conducting electrolytes in PCFCs.
  • To enhance electrolyte stability and efficiency under harsh operating conditions.

Main Methods:

  • Synthesized a novel HEPO material (Ba1.05Ce0.45ZYYbPr0.10Gd0.15O3-δ) using synergistic A-site stoichiometric compensation and oxygen vacancy engineering.
  • Characterized material properties including conductivity and electrochemical performance in anode-supported single cells.
  • Conducted stability tests using electrochemical impedance spectroscopy under various atmospheres.

Main Results:

  • The developed HEPO exhibited a conductivity of 8.9 mS cm⁻¹ at 600 °C in wet air.
  • Single cells with HEPO electrolytes achieved a peak power density of 397 mW cm⁻² at 600 °C.
  • The HEPO material demonstrated good chemical and phase structure stability.

Conclusions:

  • High-entropy perovskite oxides are a promising class of materials for developing stable and efficient proton-conducting electrolytes for PCFCs.
  • The novel HEPO composition shows significant potential for advancing PCFC technology.