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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate

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Phase-Selective Precrystallization Enables the Topological Conversion of Uniform Mesoporous Titanium Nitride.

Yalin He¹, Yuqi Zhao^1,2, Chenxi Guo¹

¹College of Energy Materials and Chemistry, College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China.

Journal of the American Chemical Society

|April 21, 2026

Summary

Researchers developed a new method to create mesoporous titanium nitride (TiN) microspheres by precrystallizing rutile titanium dioxide (TiO2) intermediates. This preserves mesostructure at lower temperatures, enabling efficient catalysts for water electrolysis.

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Area of Science:

Materials Science
Nanotechnology
Catalysis

Background:

Nonoxide ceramics possess desirable properties but integrating mesoporosity is challenging due to high-temperature processing.
Conventional methods disrupt mesoscopic order via lattice reconstruction and grain coarsening.

Purpose of the Study:

To develop a novel strategy for synthesizing mesoporous nonoxide ceramics with preserved mesostructure.
To enable topology-preserving oxide-to-nitride conversion at reduced temperatures.

Main Methods:

Phase-selective precrystallization of mesostructured rutile TiO2 intermediates.
Utilizing a transient carbon scaffold to suppress grain coarsening.
Low-temperature nitridation at 700 °C.

Main Results:

Successfully synthesized mesoporous titanium nitride (TiN) microspheres with preserved mesoscale topology.
Achieved high surface area (82 m2 g-1), controlled pore size (17.5 nm), and minimal volume contraction (7.3%).
Demonstrated superior performance as Ir catalyst supports for proton-exchange membrane water electrolysis (1.64 V at 1.0 A cm-2, >500 h durability at low Ir loading).

Conclusions:

Phase-selective precrystallization is a viable strategy for creating high-performance mesoporous nonoxide ceramics.
The developed TiN material offers enhanced catalytic activity and stability for electrochemical applications.
This approach reconciles mesoporosity and crystallinity in nonoxide materials.