Thermally Pretreated 46% Pt/Vulcan XC72: Characterisation by TGA/DSC/TEM and Cyclic Voltammetry

Pinchuk, O. A.; Aubuchon, Steven R.; Marks, Carolyn B.; Dominey, Raymond N.; Dundar, F.; Deniz, Ömer Faruk; Ata, Ali; Wynne, Kenneth J.

doi:10.1002/fuce.200800183

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…From the left-hand side of Figure a, one can identify two to three peaks between 100 and 250 °C. These peaks correspond primarily to the decomposition of the nitrate salt and/or Cu(OH) 2 , elimination of NH 3 , , and oxidation of functional groups on the carbon support itself. , Whereas the low-temperature peaks are assigned to Cu(NO 3 ) 2 ·3H 2 O melting and NH 3 elimination, peaks at temperatures between 200 and 250 °C are allocated to the decomposition of Cu(NO 3 ) 2 ·3H 2 O or Cu(OH) 2 to CuO. , It is noticeable that the latter peak is more pronounced in the case of Cu–Ni–N–AC and Cu–Ni–N–EC, and this is associated with a saturation of the surface with ion-exchanged copper, leading to the formation of two particle-size populations.…”

Section: Resultsmentioning

confidence: 99%

Bifunctional Nickel–Nitrogen-Doped-Carbon-Supported Copper Electrocatalyst for CO₂Reduction

et al. 2020

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Bifunctionality is a key feature of many industrial catalysts, supported metal clusters and particles in particular, and the development of such catalysts for the CO 2 reduction reaction (CO 2 RR) to hydrocarbons and alcohols is gaining traction in light of recent advancements in the field. Carbonsupported Cu nanoparticles are suitable candidates for integration in the state-ofthe-art reaction interfaces, and here, we propose, synthesize, and evaluate a bifunctional Ni−N-doped-C-supported Cu electrocatalyst, in which the support possesses active sites for selective CO 2 conversion to CO and Cu nanoparticles catalyze either the direct CO 2 or CO reduction to hydrocarbons. In this work, we introduce the scientific rationale behind the concept, its applicability, and the challenges with regard to the catalyst. From the practical aspect, the deposition of Cu nanoparticles onto carbon black and Ni−N−C supports via an ammonia-driven deposition precipitation method is reported and explored in more detail using X-ray diffraction, thermogravimetric analysis, and hydrogen temperature-programmed reduction. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and energy-dispersive X-ray spectroscopy (EDXS) give further evidence of the presence of Cu-containing nanoparticles on the Ni−N−C supports while revealing an additional relationship between the nanoparticle's composition and the electrode's electrocatalytic performance. Compared to the benchmark carbon black-supported Cu catalysts, Ni−N−C-supported Cu delivers up to a 2-fold increase in the partial C 2 H 4 current density at −1.05 V RHE (C 1 /C 2 = 0.67) and a concomitant 10-fold increase of the CO partial current density. The enhanced ethylene production metrics, obtained by virtue of the higher intrinsic activity of the Ni−N−C support, point out toward a synergistic action between the two catalytic functionalities.

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Section: Resultsmentioning

confidence: 99%

Bifunctional Nickel–Nitrogen-Doped-Carbon-Supported Copper Electrocatalyst for CO₂Reduction

et al. 2020

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“…[177,178] In addition to CH4N, the peak at m/z value of 30 could also attribute to oxidized carbon species such as CH2O. [179] Other fragments such as C2H4O, CH4N2, CONH2 may correspond to peak at m/z value of 44 and C4H7 to peak at m/z value of 55. [176,179] Thus, based on the TGA curve and MS signals, we could clearly see that OLAC and OLAM…”

Section: Nanorods Formation Mechanismmentioning

confidence: 99%

“…[179] Other fragments such as C2H4O, CH4N2, CONH2 may correspond to peak at m/z value of 44 and C4H7 to peak at m/z value of 55. [176,179] Thus, based on the TGA curve and MS signals, we could clearly see that OLAC and OLAM…”

Section: Nanorods Formation Mechanismmentioning

confidence: 99%

Crystalline Titania Nanorods for Colloidal Liquid Crystal Based Switchable Optics

Nohoji¹

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Liquid crystalsLiquid crystals (LCs) are typically associated with the development of various LCbased displays (LCDs) such as flat-panel televisions, touchscreen displays, and computer monitors used in our daily lives. Besides massive achievements in the field of LCDs over the last decades, [1] LCs have also attracted attention in a broad range of non-display applications from telecommunication technologies, photonics, sensors, and medicine to self-assembled amphiphilic soap molecules, which are on the borderline between soft condensed matter and nanotechnology. [2][3][4] This class of matter is of great interest mainly due to its fascinating anisotropic properties (i.e., refractive index, viscosity, elastic constant, electric conductivity, or magnetic susceptibility) that can be manipulated via responses to applied external stimuli (i.e., mechanical, electric, magnetic, or even optical stimuli) or their spontaneous self-organization.[1,5] Nowadays, many optical applications benefit from the elastic behavior of LCs (specifically commercial thermotropic LCs) which can be tuned via electric or magnetic fields. The alteration in the orientation of the mesogens in these LCs changes the orientation of the optical axis, resulting in birefringence. Several effects of the anisotropic properties of LCs with polarized light are reproduced from references [6,7] and shown in Figure 1-1.In general, LCs are referred to as intermediate phases or mesophases formed by elongated building blocks or mesogens which can be organic, inorganic, or organometallic compounds. These mesophases are thermodynamically stable and located between the three-dimensional solid crystal and the viscous liquid, which is an isotropic disordered phase. Therefore, LCs are characterized by long-ranged orientational order, which can be combined with long-ranged positional order in one or two dimensions of their long mesogens axis, resulting in direction-dependent physical properties analogous to crystalline solids whereas the ability to flow and long-ranged diffusion is preserved similar to fluids. [8] Although some liquid crystalline properties were observed and described by several researchers more than 100 years ago, thermotropic LCs were not realized until 1888 when Reinitzer[9] discovered this state of matter, which was followed by Lehmann[10] in 1889 who assigned the term 'thermotropic liquid crystals' to these mesophases (the references are in German). [11] In general, two main classes of LCs are distinguished: thermotropic within the layers and at the same time stand parallel to the layer's normal director, the smectic phase is called smectic-B. If the hexagonal order inside the layers exhibits a longrange positional order, the structure will be therefore a three-dimensional crystal. [12] Likewise, the aforementioned LC phases are observed in lyotropic LCs, however, due to the nature of these mesophases, they are formed when the concentration of the anisotropic mesogens is raised to a high enough value. If anisotropic molecular mesogens form lyotr...

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Durability Improvement of a Pt Catalyst with the Use of a Graphitic Carbon Support

Xia

Wang

Teng

et al. 2010

Chemistry A European J

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Thermally Pretreated 46% Pt/Vulcan XC72: Characterisation by TGA/DSC/TEM and Cyclic Voltammetry

Cited by 9 publications

References 18 publications

Bifunctional Nickel–Nitrogen-Doped-Carbon-Supported Copper Electrocatalyst for CO₂Reduction

Bifunctional Nickel–Nitrogen-Doped-Carbon-Supported Copper Electrocatalyst for CO₂Reduction

Crystalline Titania Nanorods for Colloidal Liquid Crystal Based Switchable Optics

Durability Improvement of a Pt Catalyst with the Use of a Graphitic Carbon Support

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Thermally Pretreated 46% Pt/Vulcan XC72: Characterisation by TGA/DSC/TEM and Cyclic Voltammetry

Cited by 9 publications

References 18 publications

Bifunctional Nickel–Nitrogen-Doped-Carbon-Supported Copper Electrocatalyst for CO2Reduction

Bifunctional Nickel–Nitrogen-Doped-Carbon-Supported Copper Electrocatalyst for CO2Reduction

Crystalline Titania Nanorods for Colloidal Liquid Crystal Based Switchable Optics

Durability Improvement of a Pt Catalyst with the Use of a Graphitic Carbon Support

Contact Info

Product

Resources

About

Bifunctional Nickel–Nitrogen-Doped-Carbon-Supported Copper Electrocatalyst for CO₂Reduction

Bifunctional Nickel–Nitrogen-Doped-Carbon-Supported Copper Electrocatalyst for CO₂Reduction