Stabilisierung von Eisenoxid‐Nanostrukturen mit mehrlagigem Kohlenstoff und Einsatz als Oxidationskatalysator

Gao, Yongjun; Ma, Ding; Hu, Gang; Zhai, Peng; Bao, Xinhe; Zhu, Bo; Zhang, Bingsen

doi:10.1002/ange.201101737

Angewandte Chemie

2011

DOI: 10.1002/ange.201101737

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Stabilisierung von Eisenoxid‐Nanostrukturen mit mehrlagigem Kohlenstoff und Einsatz als Oxidationskatalysator

Yongjun Gao

Ding Ma

Gang Hu

et al.

Abstract: Kompositkatalysatoren aus mehrlagigem Kohlenstoff und Eisenoxid sind sehr aktiv in der katalytischen Oxidation von sekundären Alkoholen. Größe und Struktur der Eisenoxid-Partikel (blau im Transmissionselektonenmikroskopiebild), die in den mehrlagigen Kohlenstoff eingebettet sind, können relativ einfach über eine Änderung der Reduktionstemperatur kontrolliert werde

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Cited by 6 publications

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“…Graphene is an outstanding supporting material for efficient catalysts, because it can enhance the catalytic performance with synergetic effects. [10][11][12][13][14][15][16][17][18] Recently, graphene was used to support various non-noble metal nanoparticles (NPs) for efficient catalysts for the hydrolysis of AB. [14][15][16] Although the hybrids showed enhanced catalytic properties, their performance remained insufficient and their electronic structure had not been well studied.…”

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Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

et al. 2016

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Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

et al. 2016

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Synthesis of Carbon/Sulfur Nanolaminates by Electrochemical Extraction of Titanium from Ti₂SC

et al. 2015

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Herein we electrochemically and selectively extract Ti from the MAX phase Ti 2 SC to form carbon/sulfur (C/S) nanolaminates at room temperature. The products are composed of multi-layers of C/S flakes, with predominantly amorphous and some graphene-like structures. Covalent bonding between C and S is observed in the nanolaminates, which render the latter promising candidates as electrode materials for Li-S batteries. We also show that it is possible to extract Ti from other MAX phases, such as Ti 3 AlC 2 , Ti 3 SnC 2 , and Ti 2 GeC, suggesting that electrochemical etching can be a powerful method to selectively extract the "M" elements from the MAX phases, to produce "AX" layered structures, that cannot be made otherwise. The latter hold promise for a variety of applications, such as energy storage, catalysis, etc.

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Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

et al. 2016

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Ammonia-borane (AB) is an excellent material for chemical storage of hydrogen. However,t he practical utilization of AB for production of hydrogen is hindered by the need of expensive noble metal-based catalysts.H ere,w er eport Cu x Co 1Àx Onanoparticles (NPs) facilely deposited on graphene oxide (GO) as alow-cost and high-performance catalyst for the hydrolysis of AB.T his hybrid catalyst exhibits an initial total turnover frequency (TOF) value of 70.0 (H 2 )m ol/(Cat-metal) mol·min, which is the highest TOFe ver reported for noble metal-free catalysts,and agood stability keeping 94 %activity after 5c ycles.S ynchrotron radiation-based X-ray absorption spectroscopy( XAS) investigations suggested that the high catalytic performance could be attributed to the interfacial interaction between Cu x Co 1Àx ON Ps and GO.M oreover,t he catalytic hydrolysis mechanismw as studied by in situ XAS experiments for the first time,w hichr eveal asignificant water adsorption on the catalyst and clearly confirm the interaction between AB and the catalyst during hydrolysis.Controlled storage and release of hydrogen are well-known challenges in establishing av iable fuel-cell-based hydrogen economy. [1][2][3] Recently,the chemical storage of hydrogen was considered as af easible way for practical applications. [1][2][3][4][5][6][7][8] Among the chemical hydrogen-storage materials,a mmoniaborane (AB) has been regarded as aleading contender owing to its high hydrogen content (19.6 wt %), high stability in both aqueous solutions and air at room temperature,a nd nontoxicity. [1][2][3][4][5][6][7][8][9] However,u ntil now,e ffective catalysts for the hydrolysis of AB are typically based on expensive and rare noble metals (such as Pt, Ru), [4,7,8] which has largely hampered applications. [3,5,7] Thus,a lternate catalysts for high-efficiencyh ydrolysis of AB based on inexpensive nonnoble metal elements are highly required and intensely studied. [3,5,7] Despite many catalysts for the hydrolysis of AB,h igh-performance noble metal-free catalyst with practical efficiency and sustainability remains unavailable and adaunting challenge.T he catalytic mechanism regarding the electronic structure changes of the catalysts is also unclear and has largely limited the design of high-efficiencycatalysts.Graphene is an outstanding supporting material for efficient catalysts,b ecause it can enhance the catalytic performance with synergetic effects. [10][11][12][13][14][15][16][17][18] Recently,g raphene was used to support various non-noble metal nanoparticles (NPs) for efficient catalysts for the hydrolysis of AB. [14][15][16] Although the hybrids showed enhanced catalytic properties, their performance remained insufficient and their electronic structure had not been well studied. [14][15][16] Herein we report af acile way to prepare the hybrids of Cu x Co 1Àx ON Ps on graphene oxide (GO). Theo ptimized hybrid (Cu x Co 1Àx O-GO) shows superior catalytic performance in the hydrolysis of AB with ah igh initial TOF value of 70.0 (H 2 )m ol/(Catmetal) mol...

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Stabilisierung von Eisenoxid‐Nanostrukturen mit mehrlagigem Kohlenstoff und Einsatz als Oxidationskatalysator

Cited by 6 publications

References 28 publications

Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

Synthesis of Carbon/Sulfur Nanolaminates by Electrochemical Extraction of Titanium from Ti₂SC

Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

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Stabilisierung von Eisenoxid‐Nanostrukturen mit mehrlagigem Kohlenstoff und Einsatz als Oxidationskatalysator

Cited by 6 publications

References 28 publications

CuxCo1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

CuxCo1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

Synthesis of Carbon/Sulfur Nanolaminates by Electrochemical Extraction of Titanium from Ti2SC

CuxCo1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

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Product

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Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane

Synthesis of Carbon/Sulfur Nanolaminates by Electrochemical Extraction of Titanium from Ti₂SC

Cu_xCo_1−xO Nanoparticles on Graphene Oxide as A Synergistic Catalyst for High‐Efficiency Hydrolysis of Ammonia–Borane