Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol Hydrogenation
Heterogeneous catalysis often involves charge transfer between adsorbed molecules and the surface of catalyst, and thus their activity depends on the surface charge density. The efficiency of charge transfer could be optimized by adjusting the concentration of oxygen vacancies (O<sub>v</sub...
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doaj-7b69469402244e17891f8b32bc90e7eb2020-11-25T02:29:51ZengMDPI AGCatalysts2073-43442019-11-0191194410.3390/catal9110944catal9110944Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol HydrogenationJun Zhou0Yue Zhang1Song Li2Jing Chen3Key Lab for Anisotropy and Texture of Materials (MoE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, ChinaKey Lab for Anisotropy and Texture of Materials (MoE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, ChinaKey Lab for Anisotropy and Texture of Materials (MoE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, ChinaInstitute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen 518060, ChinaHeterogeneous catalysis often involves charge transfer between adsorbed molecules and the surface of catalyst, and thus their activity depends on the surface charge density. The efficiency of charge transfer could be optimized by adjusting the concentration of oxygen vacancies (O<sub>v</sub>). In this work, hexagonal Ni(OH)<sub>2</sub> nanoparticles were initially synthesized by a hydrothermal process using aluminum powder as the sacrificial agent, and were then converted into 2D Ni/NiO nanocomposites through in situ reduction in hydrogen flow. The oxygen vacancy concentration in the NiO nanosheet could be well-controlled by adjusting the reduction temperature. This resulted in strikingly high activities for hydrogenation of nitrophenol. The Ni/NiO nanocomposite could easily be recovered by a magnetic field for reuse. The present finding is beneficial for producing better hydrogenation catalysts and paves the way for the design of highly efficient catalysts.https://www.mdpi.com/2073-4344/9/11/944metal-oxide interactionoxygen vacancyhydrogenationcatalyst |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jun Zhou Yue Zhang Song Li Jing Chen |
spellingShingle |
Jun Zhou Yue Zhang Song Li Jing Chen Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol Hydrogenation Catalysts metal-oxide interaction oxygen vacancy hydrogenation catalyst |
author_facet |
Jun Zhou Yue Zhang Song Li Jing Chen |
author_sort |
Jun Zhou |
title |
Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol Hydrogenation |
title_short |
Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol Hydrogenation |
title_full |
Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol Hydrogenation |
title_fullStr |
Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol Hydrogenation |
title_full_unstemmed |
Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol Hydrogenation |
title_sort |
ni/nio nanocomposites with rich oxygen vacancies as high-performance catalysts for nitrophenol hydrogenation |
publisher |
MDPI AG |
series |
Catalysts |
issn |
2073-4344 |
publishDate |
2019-11-01 |
description |
Heterogeneous catalysis often involves charge transfer between adsorbed molecules and the surface of catalyst, and thus their activity depends on the surface charge density. The efficiency of charge transfer could be optimized by adjusting the concentration of oxygen vacancies (O<sub>v</sub>). In this work, hexagonal Ni(OH)<sub>2</sub> nanoparticles were initially synthesized by a hydrothermal process using aluminum powder as the sacrificial agent, and were then converted into 2D Ni/NiO nanocomposites through in situ reduction in hydrogen flow. The oxygen vacancy concentration in the NiO nanosheet could be well-controlled by adjusting the reduction temperature. This resulted in strikingly high activities for hydrogenation of nitrophenol. The Ni/NiO nanocomposite could easily be recovered by a magnetic field for reuse. The present finding is beneficial for producing better hydrogenation catalysts and paves the way for the design of highly efficient catalysts. |
topic |
metal-oxide interaction oxygen vacancy hydrogenation catalyst |
url |
https://www.mdpi.com/2073-4344/9/11/944 |
work_keys_str_mv |
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1724831393044758528 |