Ti‐MOF‐derived titanium oxycarbonitride for high‐durability oxygen reduction reaction catalysts

Abstract Titanium oxycarbonitride (TiO x C y N z ) was synthesized using a metal‐organic framework (MOF), MIL‐125‐NH 2 , as a precursor. TiO x C y N z was prepared through the carbonization of the MOF and optimized as a supporting material with a high surface area and uniform structure. The MOF synthesis process was tailored by adjusting the metal‐to‐ligand ratio and solvent composition to enhance particle size and structural uniformity. TiO x C y N z was thermally treated at 1000°C, resulting in a stable structure with a high nitrogen and carbon composition, thereby enhancing metal‐support interactions and improving electron transfer capabilities. Uniformly loaded Pt nanoparticles on TiO x C y N z exhibited 2.3 times higher mass activity for the oxygen reduction reaction compared to commercial Pt/C, along with exceptional durability under long‐term accelerated degradation tests. This study demonstrates the potential of TiO x C y N z as a high‐performance catalyst support for fuel cells and sustainable energy system.