Enhanced hydrogen generation by reverse spillover effects over bicomponent catalysts.

Enhanced hydrogen generation by reverse spillover effects over bicomponent catalysts.
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通过双组分催化剂的反向溢出效应增强氢气的产生

DOI:
10.1038/s41467-021-27785-5
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发表时间:
2022-01-10
影响因子:
16.6
通讯作者:
Qin Y
Qin Y
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Gao Z;Wang G;Lei T;Lv Z;Xiong M;Wang L;Xing S;Ma J;Jiang Z;Qin Y

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反向溢出效应对制氢反应的贡献仍然存在争议。本文通过原子层沉积法构建了空间分离的NiO/Al 2 O3/Pt双组分催化剂,并进行了原位快速X射线吸收近边结构(XANES)表征,证明了氨硼烷水解反应中反向溢出的促进作用。对于NiO/Al 2 O3/Pt催化剂,NiO和Pt纳米颗粒分别附着在Al 2 O3纳米管的外表面和内表面。原位XANES结果表明,氨硼烷水解,在NiO网站产生的H物种溢出整个支持Pt网站的Pt。相反的溢出效应解释了NiO/Al 2 O3/Pt的H2生成速率的增强。对于CoOx/Al_2O_3/Pt和NiO/TiO_2/Pt催化剂,也证实了反向溢出效应。我们相信,深入了解的逆效应将有助于澄清催化机理,并提供一个指导,设计高效的催化剂用于制氢反应。
The contribution of the reverse spillover effect to hydrogen generation reactions is still controversial. Herein, the promotion functions for reverse spillover in the ammonia borane hydrolysis reaction are proven by constructing a spatially separated NiO/Al2O3/Pt bicomponent catalyst via atomic layer deposition and performing in situ quick X-ray absorption near-edge structure (XANES) characterization. For the NiO/Al2O3/Pt catalyst, NiO and Pt nanoparticles are attached to the outer and inner surfaces of Al2O3nanotubes, respectively. In situ XANES results reveal that for ammonia borane hydrolysis, the H species generated at NiO sites spill across the support to the Pt sites reversely. The reverse spillover effects account for enhanced H2generation rates for NiO/Al2O3/Pt. For the CoOx/Al2O3/Pt and NiO/TiO2/Pt catalysts, reverse spillover effects are also confirmed. We believe that an in-depth understanding of the reverse effects will be helpful to clarify the catalytic mechanisms and provide a guide for designing highly efficient catalysts for hydrogen generation reactions.
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