Enhanced catalytic activity and stability of Pt nanoparticles by surface coating of nanosized graphene oxide for hydrogen production from hydrolysis of ammonia-borane
Enhanced catalytic activity and stability of Pt nanoparticles by surface coating of nanosized graphene oxide for hydrogen production from hydrolysis of ammonia-borane
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通过纳米级氧化石墨烯表面涂层增强 Pt 纳米颗粒的催化活性和稳定性，用于氨硼烷水解制氢
DOI：
10.1039/c7se00384f
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发表时间：
2017
影响因子：
5.6
通讯作者：
Zhang Shufen
中科院分区：
文献类型：
--
作者：
Ye Wanyue;Ge Yuzhen;Gao Zhanming;Lu Rongwen;Zhang Shufen
我们报道了通过涂覆1 nm的纳米级氧化石墨烯（NGO）薄层来对二氧化硅负载的Pt纳米颗粒（SiO2@Pt）进行电子改性。与SiO2@Pt和石墨烯负载的Pt纳米颗粒相比，所得SiO2@Pt@NGO对氨-硼烷水解制氢表现出更高的催化活性和稳定性，其初始TOF值达到令人印象深刻的324.6 molH 2 molPt-1 min-1。通过HRTEM和EDS元素图谱的详细表征证明了SiO2@Pt@NGO结构的正确性。XPS结果表明，在SiO2@Pt@NGO中Pt 0 4f 7/2的结合能为71.12 eV，略高于SiO2@Pt中Pt 0 4f 7/2的结合能70.84 eV，表明与NGO相互作用后，Pt原子中缺电子量增加，这可能是催化性能增强的原因.
We report the electronic modification of silica supported Pt nanoparticles (SiO2@Pt) by coating a 1 nm thin layer of nanosized graphene oxide (NGO). The resulting SiO2@Pt@NGO showed much enhanced catalytic activity and stability for hydrogen production from hydrolysis of ammonia–borane compared with SiO2@Pt and graphene supported Pt nanoparticles, with an impressive initial TOF value reaching 324.6 molH2 molPt−1 min−1. Detailed characterization by means of HRTEM and EDS elemental mapping proved the structural correctness of SiO2@Pt@NGO. The XPS results showed that the binding energy of Pt0 4f7/2 in SiO2@Pt@NGO was 71.12 eV slightly higher than 70.84 eV of Pt0 4f7/2 in SiO2@Pt, indicating more electron-deficient Pt atoms after the interaction with NGO, which may be responsible for the enhanced catalytic performance.