TiO₂ is an important material used in photocatalytic H₂ evolution. Here nanosheets with a Ti_0.5Ru_0.5O₂/TiO₂(B)/TiO₂(A) three-phase-junctions, composed of solid solution rutile phase Ti_0.5Ru_0.5O₂, bronze phase TiO₂(B), and anatase phase TiO₂(A), are constructed via a hydrothermal method and subsequent calcination. At the optimal calcination temperature of 350 °C, the highest H₂ evolution rate reaches 27.817 mmol∙g⁻¹∙h⁻¹ at 25 °C, which is further increased up to 62.357 mmol∙g⁻¹∙h⁻¹ at 70 °C by synergistic photothermal catalysis. The photocatalytic activity of the optimized catalyst was further enhanced by loading with Pt as a co-catalyst. It is found that, in addition to helping charge separation, migration, and inhibiting the charge recombination, the three-phase-junctions structure is a key to present strong oxidation and reduction ability. Ti_0.5Ru_0.5O₂ solid solution has excellent co-catalytic ability, much better than Ru oxide, metallic Ru, as well as Pt. It works as hole acceptor, accelerating the generation and quench of photo induced peroxyl radicals, and thus significantly enhancing the H₂ generation rate.

TiO ₂是用于光催化H ₂析出的重要材料。这里的纳米片具有 Ti _0.5 Ru _0.5 O ₂ /TiO ₂ (B)/TiO ₂ (A) 三相结，由固溶体金红石相 Ti _0.5 Ru _0.5 O ₂、青铜相 TiO ₂ (B) 和锐钛矿相TiO ₂ (A)，是通过水热法和随后的煅烧构建的。在350°C的最佳煅烧温度下，最高的H ₂析出率达到27.817 mmol∙g ^-1 ∙h ^-1在 25 °C 时，通过协同光热催化在 70 °C 下进一步增加至 62.357 mmol∙g ^-1 ∙h ^-1。通过负载Pt作为助催化剂，优化催化剂的光催化活性得到进一步提高。研究发现，三相结结构除了有助于电荷分离、迁移和抑制电荷复合外，是呈现强氧化还原能力的关键。Ti _0.5 Ru _0.5 O ₂固溶体具有优异的助催化能力，远优于Ru氧化物、金属Ru以及Pt。它作为空穴受体，加速光致过氧自由基的产生和猝灭，从而显着提高 H ₂ 生成率。