Coexistence of Cu(<scp>ii</scp>) and Cu(<scp>i</scp>) in Cu ion-doped zeolitic imidazolate frameworks (ZIF-8) for the dehydrogenative coupling of silanes with alcohols

Dai, Yan; Xing, Pengfei; Cui, Xiaoqin; Li, Zhihong; Zhang, Xianming

doi:10.1039/c9dt03181b

Cited by 43 publications

(22 citation statements)

References 37 publications

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“…Given the formation of polyselenides during charging/ discharging process, the Se 3d spectra shifts back to higher binding energy at the fully sodiation state in Fig. 5e, suggesting the final conversion of polyselenides, presumedly Na 2 Se [14,30]. Dynamic electrochemical responses of the heterostructured electrode can be examined by CV scanning at different scan rates.…”

Section: Ultrafast Ions Transportation Kinetic Analysis Of Mse-mxene Cnrib In Sibsmentioning

confidence: 99%

Strongly Coupled 2D Transition Metal Chalcogenide-MXene-Carbonaceous Nanoribbon Heterostructures with Ultrafast Ion Transport for Boosting Sodium/Potassium Ions Storage

Cao

et al. 2021

Nano-Micro Lett.

123

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Highlights Unique “Janus” interfacial assemble strategy of 2D MXene nanosheets was proposed firstly. Ternary heterostructure consisting of high capacity transitional metal chalcogenide, high conductive 2D MXene and N rich fungal carbonaceous matrix was achieved for larger radius Na/K ions storages. The highly accessible surfaces and interfaces of the strongly coupled 2D based ternary heterostructures provide superb surficial pseudocapacitive storages for both Na and K ions with low energy barriers was verified. Abstract Combining with the advantages of two-dimensional (2D) nanomaterials, MXenes have shown great potential in next generation rechargeable batteries. Similar with other 2D materials, MXenes generally suffer severe self-agglomeration, low capacity, and unsatisfied durability, particularly for larger sodium/potassium ions, compromising their practical values. In this work, a novel ternary heterostructure self-assembled from transition metal selenides (MSe, M = Cu, Ni, and Co), MXene nanosheets and N-rich carbonaceous nanoribbons (CNRibs) with ultrafast ion transport properties is designed for sluggish sodium-ion (SIB) and potassium-ion (PIB) batteries. Benefiting from the diverse chemical characteristics, the positively charged MSe anchored onto the electronegative hydroxy (–OH) functionalized MXene surfaces through electrostatic adsorption, while the fungal-derived CNRibs bonded with the other side of MXene through amino bridging and hydrogen bonds. This unique MXene-based heterostructure prevents the restacking of 2D materials, increases the intrinsic conductivity, and most importantly, provides ultrafast interfacial ion transport pathways and extra surficial and interfacial storage sites, and thus, boosts the high-rate storage performances in SIB and PIB applications. Both the quantitatively kinetic analysis and the density functional theory (DFT) calculations revealed that the interfacial ion transport is several orders higher than that of the pristine MXenes, which delivered much enhanced Na+ (536.3 mAh g−1@ 0.1 A g−1) and K+ (305.6 mAh g−1@ 1.0 A g−1 ) storage capabilities and excellent long-term cycling stability. Therefore, this work provides new insights into 2D materials engineering and low-cost, but kinetically sluggish post-Li batteries.

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Section: Ultrafast Ions Transportation Kinetic Analysis Of Mse-mxene Cnrib In Sibsmentioning

confidence: 99%

Strongly Coupled 2D Transition Metal Chalcogenide-MXene-Carbonaceous Nanoribbon Heterostructures with Ultrafast Ion Transport for Boosting Sodium/Potassium Ions Storage

Cao

et al. 2021

Nano-Micro Lett.

123

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“…WP6-MB host-guest complexation was synthesized according to the published procedure [22,24,25], which was fully characterized by 1 H NMR (Figures S1 and S2 in the Supporting Information). Cu/ZIF-8@ZIF-8 was first synthesized according to the published procedure [23,26]. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that Cu/ZIF-8@ZIF-8 had typical hexagon morphology, with a diameter of approximately 190-290 nm (Figure 1a,b and Figure S4).…”

Section: Resultsmentioning

confidence: 99%

A Supramolecular Photosensitizer System Based on Nano-Cu/ZIF-8 Capped with Water-Soluble Pillar[6]arene and Methylene Blue Host–Guest Complexations

Chao

et al. 2021

Molecules

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Photodynamic therapy (PDT) as a safe, non-invasive modality for cancer therapy, in which the low oxygen and high glutathione in the tumor microenvironment reduces therapeutic efficiency. In order to overcome these problems, we prepared a supramolecular photosensitive system of O2-Cu/ZIF-8@ZIF-8@WP6–MB (OCZWM), which was loaded with oxygen to increase the oxygen concentration in the tumor microenvironment, and the Cu2+ in the system reacted with glutathione (GSH) to reduce the GSH concentration to generate Cu+. It is worth noting that the generated Cu+ can produce the Fenton reaction, thus realizing the combination therapy of PDT and chemodynamic therapy (CDT) to achieve the purpose of significantly improving the anti-cancer efficiency.

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“…Cu 2 O/Cu species uniformly dispersed in the carbon skeleton due to the coordination between copper ions and nitrogen sites in PB skeleton. [17] After removal of SiO 2 templates, the HCS/Cu-x was obtained. The coordination between copper ions and nitrogen sites was confirmed by X-ray photoelectron spectroscopy (XPS) characterization of SiO 2 @ PB and SiO 2 @PB/Cu-0.12 (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Copper/Carbon Heterogenous Interfaces for Enhanced Selective Electrocatalytic Reduction of CO₂ to Formate

Xin

Dong

et al. 2021

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bismuth-, [5,7] and tin-based [8] electrodes, the low abundance and uneven distribution of the respective elements result in a high cost. Cu is an Earth abundant element and has a considerably lower price. [9] Recent studies revealed that formate could be generated over metallic Cu catalysts via CO 2 RR, while it is always accompanied by the production of other products. To improve the performance of Cu-based catalyst for formate production, an effective approach was to design Cu-based heterostructures. [10] Cu-Au bimetallic catalyst showed an outstanding formate Faradaic efficiency (FE) of 81% and a formate current density (j formate ) of 10.4 mA cm −2 for formate at −0.6 V versus reversible hydrogen electrode (RHE). [11] Wang et al. reported a CuS/Cu 2 O catalyst which exhibited FE of 67.6% for formate production with current density of 15.3 mA cm −2 at the given potential −0.9 V versus RHE. [9] On cobaltdecorated Cu thin films, formate could be formed with FE of 80% and the current density of 1.1 mA cm −2 at −0.65 V versus RHE. [12] Carbon-supported copper catalysts also were used to produce formate via CO 2 RR, [3,13] and it has been well known that electrocatalytic performance not only depends on the morphologic and structural characteristics of metal particles, but also the properties of the carbon substrates. Metal-organic frameworks (MOFs) are one of the attractive carbon precursors which have been widely used to fabricate the hybrid catalysts containing metal (oxides) nanoparticles and porous carbon materials. MOF-derived Cu 2 O/Cu nanospheres anchored in nitrogen-doped hollow porous carbon hybrid composites (Cu 2 O/ Cu@NC) exhibited FE of 70.5% for formate production with current density of below 10 mA cm −2 at −0.68 V versus RHE. [14] Yang et al. presented a catalyst of Cu nanoparticles embedded in carbon substrate for CO 2 RR to formate with FE of 78% and current density of 6 mA cm −2 at −1.2 V versus RHE. [15] In spite of these impressive efforts, the current density of CO 2 to formate over Cu-based catalysts is always very low. A current density of 65.8 mA cm −2 at −1.8 V versus Ag/Ag + was observed with an FE to formic acid of 90.5% over MOFs-decorated Cu cathode in the electrolytes containing ionic liquid, organic solvent, and H 2 O. [16] However, the utilization of organic solvent and ionic liquid increases the preparation cost, and the volatilization of acetonitrile may lead to the loss of electrolyte. Therefore, developing a Cu-based electrocatalyst with high formate selectivity and activity under the aqueous media remains a great challenge.Herein, we developed a hybrid composite electrocatalyst including Cu 2 O, Cu, and nitrogen-doped carbon (HCS/Cu), Electrochemical reduction of CO 2 (CO 2 RR) to formate is a promising route to prepare value-added chemical. Developing low-cost and efficient electrocatalysts with high product selectivity is still a grand challenge. Herein, a novel Cu anchored on hollow carbon spheres catalysts (HCS/Cu-x, x represents the mass of CuCl 2 added in the system) ...

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Coexistence of Cu(ii) and Cu(i) in Cu ion-doped zeolitic imidazolate frameworks (ZIF-8) for the dehydrogenative coupling of silanes with alcohols

Abstract: Coexistence of Cu(ii) and Cu(i) in Cu ion doped ZIF-8 nanocrystals for dehydrogenative coupling.

Cited by 43 publications

References 37 publications

Strongly Coupled 2D Transition Metal Chalcogenide-MXene-Carbonaceous Nanoribbon Heterostructures with Ultrafast Ion Transport for Boosting Sodium/Potassium Ions Storage

Strongly Coupled 2D Transition Metal Chalcogenide-MXene-Carbonaceous Nanoribbon Heterostructures with Ultrafast Ion Transport for Boosting Sodium/Potassium Ions Storage

A Supramolecular Photosensitizer System Based on Nano-Cu/ZIF-8 Capped with Water-Soluble Pillar[6]arene and Methylene Blue Host–Guest Complexations

Copper/Carbon Heterogenous Interfaces for Enhanced Selective Electrocatalytic Reduction of CO₂ to Formate

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Coexistence of Cu(ii) and Cu(i) in Cu ion-doped zeolitic imidazolate frameworks (ZIF-8) for the dehydrogenative coupling of silanes with alcohols

Abstract: Coexistence of Cu(ii) and Cu(i) in Cu ion doped ZIF-8 nanocrystals for dehydrogenative coupling.

Cited by 43 publications

References 37 publications

Strongly Coupled 2D Transition Metal Chalcogenide-MXene-Carbonaceous Nanoribbon Heterostructures with Ultrafast Ion Transport for Boosting Sodium/Potassium Ions Storage

Strongly Coupled 2D Transition Metal Chalcogenide-MXene-Carbonaceous Nanoribbon Heterostructures with Ultrafast Ion Transport for Boosting Sodium/Potassium Ions Storage

A Supramolecular Photosensitizer System Based on Nano-Cu/ZIF-8 Capped with Water-Soluble Pillar[6]arene and Methylene Blue Host–Guest Complexations

Copper/Carbon Heterogenous Interfaces for Enhanced Selective Electrocatalytic Reduction of CO2 to Formate

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Copper/Carbon Heterogenous Interfaces for Enhanced Selective Electrocatalytic Reduction of CO₂ to Formate