Novel inorganic tin phosphate gel: multifunctional material

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Development of advanced materials for energy applications, such as proton exchange membrane (PEM) fuel cells and capacitors, is crucial.
• Layered phosphates are explored for their potential in energy storage and conversion due to their unique structural properties.
• There is a need for cost-effective, environmentally benign synthesis methods for high-performance energy materials.

Purpose of the Study:

• To report the synthesis and characterization of a novel nanolayered tin phosphate material.
• To evaluate the material's performance as a proton conductor for PEM fuel cells.
• To assess its potential as an electrode material for electrochemical capacitors.

Main Methods:

• Facile, environmentally benign synthesis of 15 Å nanolayered tin phosphate, Sn(HPO4)2·3H2O (SnP), and its clay-like gel.
• Characterization of the material's structure and properties.
• Proton conductivity measurements at elevated temperatures.
• Electrochemical testing for lithium-ion storage kinetics.

Main Results:

• The synthesized SnP exhibits excellent proton conductivity (> 1 × 10⁻² S cm⁻¹ at 100 °C), outperforming known layered phosphates.
• The material demonstrates fast Li-storage kinetics with a charging time of 13 seconds, indicating suitability for capacitor applications.
• The synthesis process utilizes earth-abundant tin and phosphorus, offering a potentially cost-effective and sustainable route.

Conclusions:

• Sn(HPO4)2·3H2O is a multifunctional energy material with superior proton conductivity and rapid Li-storage capabilities.
• This novel layered phosphate holds significant promise for next-generation PEM fuel cells and electrochemical capacitors.
• The facile and eco-friendly synthesis method makes this material highly attractive for scalable industrial applications.