A nickel nanocatalyst within a h-BN shell for enhanced hydrogen oxidation reactions

Gao, Lijun; Wang, Ying; Li, Haobo; Li, Qihao; Ta, Na; Zhuang, Lin; Fu, Qiang; Bao, Xinhe

doi:10.1039/c7sc01615h

Cited by 127 publications

(101 citation statements)

References 48 publications

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Section: Catalysis With 2d Cover‐confined Metalsmentioning

confidence: 99%

“…The confined nanospace between 2D cover and inner metal offers an ideal micro‐environment for exploring the confinement catalysis experimentally and theoretically. For instance, Gao et al presented a simple and practical synthesis way to encapsulate Ni nanoparticles within few‐layer h‐BN cover . This unique catalyst exhibited an improved catalytic performance in the hydrogen oxidation reaction process compared with bulk metal nanoparticles (Figure c).…”

Section: Catalysis With 2d Cover‐confined Metalsmentioning

confidence: 99%

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Confinement Catalysis with 2D Materials for Energy Conversion

et al. 2019

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in catalysis but the latter is indispensable to modulate the electronic and geometric structure of active sites. In this respect, confinement catalysis is recognized for its ability to control the structural and electronic properties of active centers at nano or atom precision via the coordination environments. [3] The electronic states of the confined active sites will receive direct influence from their coordination environments, which finally alters the adsorption energetics of catalytic intermediates and consequently changes the catalytic activity and selectivity. For confinement catalysis, one important target is to search the suitable substrates to efficiently confine the active sites, and meanwhile to efficiently stabilize and fully expose the active sites. It needs the substrate materials should have stable structures, novel electronic properties, and highly exposed surface.Emerging as a novel and promising class of materials, 2D nanomaterials have captured widespread interest and achieved great development over the past two decades. [4] The well-defined structures and unique electronic properties of 2D materials have triggered wide research interest in various catalysis systems, especially in the conversion of small energy-related molecules like the O 2 , CO 2 , CH 4 , CO, H 2 O, and CH 3 OH, [5] because these small molecules are more sensitive to the electronic properties of the catalytic materials with less structure effect such as steric hindrance compared with the conversion of macromolecules. The lattice of 2D materials and the interface between 2D cover and other active components provide meaningful confining environments for active sites, which has stimulated a new area of "confinement catalysis with 2D materials." Within this lattice-and interface-confined environment, the electronic state of catalytic sites can be easily manipulated to the appropriate values matching the energy level of the substrates, which realizes the feasibility of turning activity. In addition to the precise turning of activity, the unique nanostructure of 2D materials affects kinetic reaction barriers governed by the surroundings of the active site allowing for enhanced selectivity. In addition, the high mechanical strength and thermal stability of 2D materials render it as a promising host for confined active sites. Finally, because of the relatively simple type of catalytic site and the well-defined structure, the atomically thin 2D nanosheets can serve as an ideal model for understanding confinement catalysis. Considering that 2D lattice-and interface-confined catalysts afford a highly active, selective and stable system, The unique electronic and structural properties of 2D materials have triggered wide research interest in catalysis. The lattice of 2D materials and the interface between 2D covers and other substrates provide intriguing confinement environments for active sites, which has stimulated a rising area of "confinement catalysis with 2D materials." Fundamental understanding of confinement catalysis with 2D...

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Section: Catalysis With 2d Cover‐confined Metalsmentioning

confidence: 99%

Section: Catalysis With 2d Cover‐confined Metalsmentioning

confidence: 99%

Confinement Catalysis with 2D Materials for Energy Conversion

et al. 2019

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“…This is attributed to the fact that the hexagonal BN lacks the delocalized p electrons, and the electron penetration of Ni to the BN layers is limited. [33,34] The study of the electron-shift-induced catalysis over Ni@C for promoting ethanol formation is in progress.…”

Section: Catalytic Performancementioning

confidence: 99%

Selective Cellulose Hydrogenolysis to Ethanol Using Ni@C Combined with Phosphoric Acid Catalysts

et al. 2019

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Ethanol is an important bulk chemical with diverse applications. Biomass‐derived ethanol is traditionally produced by fermentation. Direct cellulose conversion to ethanol by chemocatalysis is particularly promising but remains a great challenge. Herein, a one‐pot hydrogenolysis of cellulose into ethanol was developed by using graphene‐layers‐encapsulated nickel (Ni@C) catalysts with the aid of H3PO4 in water. The cellulose was hydrolyzed into glucose, which was activated by forming cyclic di‐ester bonds between the OH groups of H3PO4 and glucose, promoting ethanol formation under the synergistic hydrogenation of Ni@C. A 69.1 % yield of ethanol (carbon mole basis) was obtained, which is comparable to the theoretical value achieved by glucose fermentation. An ethanol concentration of up to 8.9 wt % was obtained at an increased cellulose concentration. This work demonstrates a chemocatalytic approach for the high‐yield production of ethanol from renewable cellulosic biomass at high concentration.

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“…Whereas PGM‐free oxygen reduction reaction (ORR) catalysts exhibit comparable activity to PGM catalysts, PGM‐free hydrogen oxidation reaction (HOR) catalysts are much inferior . Despite several decades of research, only nickel and its metallic alloys have been shown to be active PGM‐free HOR catalysts ,. Recently Yan and co‐workers significantly improved the activity of Ni nanoparticles in HOR using a nitrogen‐doped carbon nanotube support .…”

Section: Figurementioning

confidence: 99%

Ni₃N as an Active Hydrogen Oxidation Reaction Catalyst in Alkaline Medium

Krammer

Hsu

et al. 2019

Angewandte Chemie

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Hydroxide‐exchange membrane fuel cells can potentially utilize platinum‐group‐metal (PGM)‐free electrocatalysts, offering cost and scalability advantages over more developed proton‐exchange membrane fuel cells. However, there is a lack of non‐precious electrocatalysts that are active and stable for the hydrogen oxidation reaction (HOR) relevant to hydroxide‐exchange membrane fuel cells. Here we report the discovery and development of Ni3N as an active and robust HOR catalyst in alkaline medium. A supported version of the catalyst, Ni3N/C, exhibits by far the highest mass activity and break‐down potential for a PGM‐free catalyst. The catalyst also exhibits Pt‐like activity for hydrogen evolution reaction (HER) in alkaline medium. Spectroscopy data reveal a downshift of the Ni d band going from Ni to Ni3N and interfacial charge transfer from Ni3N to the carbon support. These properties weaken the binding energy of hydrogen and oxygen species, resulting in remarkable HOR activity and stability.

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A nickel nanocatalyst within a h-BN shell for enhanced hydrogen oxidation reactions

Abstract: The confinement effect of h-BN shells helps to maintain active metallic Ni cores and strengthen the HOR processes occurring at h-BN/Ni interfaces.

Cited by 127 publications

References 48 publications

Confinement Catalysis with 2D Materials for Energy Conversion

Confinement Catalysis with 2D Materials for Energy Conversion

Selective Cellulose Hydrogenolysis to Ethanol Using Ni@C Combined with Phosphoric Acid Catalysts

Ni₃N as an Active Hydrogen Oxidation Reaction Catalyst in Alkaline Medium

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A nickel nanocatalyst within a h-BN shell for enhanced hydrogen oxidation reactions

Abstract: The confinement effect of h-BN shells helps to maintain active metallic Ni cores and strengthen the HOR processes occurring at h-BN/Ni interfaces.

Cited by 127 publications

References 48 publications

Confinement Catalysis with 2D Materials for Energy Conversion

Confinement Catalysis with 2D Materials for Energy Conversion

Selective Cellulose Hydrogenolysis to Ethanol Using Ni@C Combined with Phosphoric Acid Catalysts

Ni3N as an Active Hydrogen Oxidation Reaction Catalyst in Alkaline Medium

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Ni₃N as an Active Hydrogen Oxidation Reaction Catalyst in Alkaline Medium