導電性Ti₄O₇支持体にPtナノ粒子を固定化することによる電気化学的水素発生速度論の促進

Ensuring efficient noble metal utilization while maintaining rapid electron transport and long-term durability remains a central challenge in the acidic hydrogen evolution reaction (HER). Herein, we report a platinum catalyst supported on Magneli phase Ti₄O₇, a conductive oxide obtained via the hydrogen reduction of TiO₂(B), in which the support plays an active electronic role rather than serving as an inert scaffold. Electrochemical and spectroscopic analyses reveal that the mixed Ti³⁺/Ti⁴⁺ valence states and high electrical conductivity of Ti₄O₇ enable strong electronic coupling with Pt, leading to reduced charge-transfer resistance and more favorable hydrogen adsorption kinetics. As a result, the optimized 3 wt % Pt/Ti₄O₇ catalyst achieves an overpotential of 13 mV at 10 mA cm^-2 with sustained activity over 100 h in 0.5 M H₂SO₄. These findings demonstrate that conductive oxide supports can actively regulate interfacial electron transfer and reaction kinetics, offering a viable strategy for low noble metal loading and high-performance HER catalysts.