We report the electronic modification of silica supported Pt nanoparticles (SiO₂@Pt) by coating 1 nm thin layer of nanosized graphene oxide (NGO). The resulted SiO₂@Pt@NGO showed much enhanced catalytic activity and stability for hydrogen production from hydrolysis of ammonia-borane comparing with SiO₂@Pt and graphene supported Pt nanoparticles, with an impressive initial TOF value reaching 324.6 mol_H2 mol_Pt⁻¹ min⁻¹. Detailed characterization by means of HRTEM and EDS element mapping proved the structural correctness of SiO₂@Pt@NGO. The XPS results showed that the binding energy of Pt⁰ 4f_7/2 in SiO₂@Pt@NGO was 71.12 eV slightly higher than Pt⁰ 4f_7/2 of 70.84 eV in SiO₂@Pt, indicating the more electron-deficient Pt atoms after the interaction with NGO, which may be responsible for the enhanced catalytic performance.

中文翻译：

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纳米氧化石墨烯表面涂层用于氨-硼烷水解制氢的作用增强了Pt纳米颗粒的催化活性和稳定性

我们报告了通过涂覆1 nm纳米尺寸的氧化石墨烯（NGO）薄层，对二氧化硅负载的Pt纳米颗粒（SiO ₂ @Pt）进行电子改性。与SiO ₂ @Pt和石墨烯负载的Pt纳米颗粒相比，所得SiO ₂ @ Pt @ NGO表现出大大增强的氨硼烷水解制氢活性和催化活性，初始TOF值达到324.6 mol _H2 mol _Pt ^-1 min ^-1。通过HRTEM和EDS元素图谱进行的详细表征证明了SiO ₂ @ Pt @ NGO的结构正确性。XPS结果表明，Pt ⁰ 4f _7/2的结合能SiO ₂ @ Pt @ NGO中的Pt原子为71.12 eV，略高于SiO ₂ @Pt中70.84 eV的Pt ⁰ 4f _7/2，这表明与NGO相互作用后，Pt原子电子更多，这可能是催化作用增强的原因。表现。