Despite substantial progress in various application fields of polyoxometalates (POMs), the use of POMs as ligands to alter the structure of solid catalysts in heterogeneous catalysis requires additional efforts. Herein, we used the reduced α-SiW₁₂O₄₀^4- (RSTA) as an inorganic ligand to mediate Co₃O₄ nanoparticles that efficiently promote the hydrolysis of NaBH₄ to generate hydrogen with multiple activities (4747 mL/(g_cat·min)) compared with NaBH₄-pretreated Co₃O₄ (1236 mL/(g_cat·min)), pristine Co₃O₄ (inactive) and commercial Co₃O₄ (inactive) at 25℃. RSTA induced both electronic and morphology effects on Co₃O₄ through in situ driving 3D Co₃O₄ nanoparticles to 2D Co₃O₄ nanosheets with rich surface oxygen vacancies or Co²⁺ during the hydrolysis process. This modulation by RSTA allowed more active sites, including both electron-rich Co⁰ and electron-deficient Co²⁺, facilitating BH₄^- and H₂O adsorption and thus hydrogen generation. The promoted mechanism of the RSTA on both the microstructure and the catalytic performance was further proposed.

尽管在多金属氧酸盐（POM）的各种应用领域中取得了重大进展，但在异相催化中使用POM作为配体来改变固体催化剂的结构仍需要额外的努力。在此，我们使用的降低的α-硅钨酸₁₂ ø ₄₀ ^4-（RSTA）作为无机配体介导共₃ ö ₄纳米颗粒有效地促进将NaBH的水解₄，以产生具有多个活动（4747毫升/（克氢_猫· min））与NaBH ₄预处理的Co ₃ O ₄（1236 mL /（g _cat ·min）），原始的Co ₃ O _{4进行比较}（惰性）和市售的Co ₃ O ₄（惰性）在25℃下。RSTA通过在水解过程中将3D Co ₃ O ₄纳米颗粒原位驱动到具有丰富表面氧空位或Co ^2+的2D Co ₃ O ₄纳米片上，对Co ₃ O ₄产生了电子和形态学效应。该调制通过RSTA允许更多的活性位点，包括钴富电子⁰和缺电子有限公司²⁺，促进BH ₄ ^-和H ₂O吸附并因此产生氢。进一步提出了RSTA在微观结构和催化性能上的促进机理。