Microwave Quasi‐Solid State to Construct Boron‐Doped Black TiO 2 Supported Ru as Advanced Electrocatalyst for Seawater Hydrogen Generation

Metal oxides have emerged as the dominant choice of matrix for the design and synthesis of supported catalysts with high‐performance, because of the tunable surface properties, low cost, and strong interactions with active components. Herein, the nanoflower‐like titanium dioxide (TiO 2 ) is achieved through solvothermal approach. Then, boron (B) doped black TiO 2 loaded with Ru (Ru/B‐TiO 2 ) is achieved through rapid (40 s) microwave quasi‐solid approach. The incorporation of B modulates the energy band structure of the electrocatalyst, creating additional active sites, and then favors the water dissociation and following hydrogen desorption. The presence of oxygen vacancy defects and metal‐support interactions (MSI) lead to satisfactory stabilization of the catalysts. These effects collectively contributed to the superior performance in 1 M KOH and alkaline seawater for the hydrogen evolution reaction (HER) with small overpotentials of 39 and 61 mV, respectively, which also demonstrates excellent activity and stability. This work presents a novel microwave‐assisted strategy for constructing metal oxide supported low‐content noble metals for energy conversion and storage applications.