Activated Single‐Phase Ti₄O₇ Nanosheets with Efficient Use of Precious Metal for Inspired Oxygen Reduction Reaction

Abstract

The oxygen reduction reaction (ORR) is central to modern energy storage and conversion technologies for grids such as fuel cells and electrolyzers, but challenges remain due to the lack of reliable, economic, and durable electrocatalysts. Here, we develop single‐crystal conductive black titanium (Ti4O7) nanosheets (NSs) as a new precious metal carrier based on sacrificial hard templates and ultrasonic‐assisted peeling, and deposit Pt clusters on Ti4O7 NSs induced by wetness impregnation under the irradiation of visible light (VI; 650 nm). Pt/Ti4O7 NSs provide Ti3+, Pt2+, and Pt0+ continuous active sites for the ORR multielectron process, achieving synergy among them. The assistance of visible light not only makes a more uniform and smaller distribution of Pt nanoclusters, but also strengthens the charge transfer, thereby constructing a strong metal‐support interaction interface. VI−Pt/Ti4O7 NSs show superior initial oxidation potential and a mass activity of 1.61 A mg−1Pt at a E1/2=0.91 V, which is nine times higher than that of commercial Pt/C. This work provides an effective strategy for achieving high‐value applications of titanium sub‐oxides and further explores the enhanced interface in metals TinO2n‐1 by light radiation.

Polyoxometalate-based frameworks for photocatalysis and photothermal catalysis

“…Compared with the rigid structures of MOFs and COFs, supramolecular frameworks (SFs) based on noncovalent interactions have attracted extensive attention due to their flexibility, dynamic tunability, and unique solution processability. 59,60 In addition to PMOFs and PCOFs, PSFs driven by noncovalent interactions have also been reported (Fig. 1c).…”

Two-dimensional organic–inorganic hybrid perovskite ferroelastics: (PEA)2[CdCl4], (3-FPEA)2[CdCl4], and (4-FPEA)2[CdCl4]

“…13,14 Ferroelasticity perovskites are characterized by a ferroelastic to paraelastic phase transition, and the symmetry of the crystal changes from a lower ferroelastic phase to a higher paraelastic phase. 15–19 At the same time, the spontaneous strain and consequent stress–strain hysteresis behaviors are observed within distinct domain structures. 20,21 Similar to ferroelectricity's switching of spontaneous polarization induced by an applied electric field, ferroelastics can switch between different ferroelastic domains by applying external stress.…”

Increasing the ferroelastic phase transition temperature of hybrid perovskites through a mixed phosphonium and ammonium cation strategy

“…Ferroelastic materials have been well applied in the fields of data storage, mechanical switches, sensing and actuation, and shape memory due to their unique physical and mechanical properties, such as superelasticity and shape memory effect. 1–6 A good understanding of ferroelastic properties can further advance a deeper and more comprehensive understanding of the switching behavior of ferroelectric, ferromagnetic and multiferroic materials. 7–10 However, since ferroelastic materials must meet the strict crystallographic requirements of 94 ferroelastic phase transitions proposed by Aizu, it is challenging to explore and design new organic–inorganic hybrid perovskite materials with ferroelasticity above room temperature.…”