Selective Alcohol Electrooxidation by ZIF-8 Functionalized Pt/Carbon Catalyst

Eßbach, Claudia; Senkovska, Irena; Unmüssig, Tobias; Fischer, Anna; Kaskel, Stefan

doi:10.1021/acsami.9b06122

Cited by 26 publications

(24 citation statements)

References 49 publications

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“…This synthesis protocol yields a Pt/Zn ratio in the composite material of 1:0.6. Such a composition shows high selectivity in alcohol electrooxidation in combination with a slightly reduced conductivity as reported by Eßbach et al The material is characterized by scanning electron microscopy (SEM) images and energy-dispersive X-ray (EDX) analysis is used to determine the distribution of the components in the composite (Figure S1, Supporting Information). SEM images are taken using a SU8020 (Hitachi) with an operating voltage of 2 kV.…”

Section: Methodsmentioning

confidence: 87%

“…To prepare the composite material, the synthesis of ZIF-8 described by Cravillon et al . is adapted. , 75 mg of the commercial catalyst Vulcan XC 72R/Pt with 10 wt % Pt and 11.3 mg Zn(NO 3 ) 2 ·6H 2 O are each suspended in 25 mL of methanol and dispersed for 20 min in an ultrasonic bath. Thereafter, 24.6 mg of 2-methylimidazolate is added to the suspension of the Vulcan XC 72R/Pt and the suspension is ultrasonicated again to ensure adsorption of the 2-methylimidazole on platinum .…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, selective enrichment of alcohols in the vicinity of the Pt particles can be assumed and the influence on the oxidation of selected alcohols was electrochemically characterized by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) measurements. These studies revealed that the oxidation of short-chain alcohols such as ethanol is affected much less than the oxidation of more hydrophobic alcohols such as 1-butanol …”

Section: Introductionmentioning

confidence: 99%

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The Role of Metal–Organic Frameworks in Moderating Platinum-Based Ethanol Electrooxidation Catalysts

et al. 2021

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Alcohol electrooxidation is an important reaction, for example, for fuel-cell applications or production of fine chemicals and pharmaceuticals. However, the reaction pathways of this reaction are not yet fully understood and optimized catalysts are necessary. Metal−organic frameworks can moderate such catalysts by forming a thin membrane acting as a filter to access the active center. Here, we present a study combining in situ and ex situ NMR spectroscopy with in situ Raman spectroscopy in order to investigate the influence of MOF coatings under voltage variation on the rate and selectivity of ethanol electrooxidation. The commercial Pt-catalyst Vulcan XC 72R/Pt is compared with a ZIF-8-functionalized Pt-catalyst (ZIF: zeolitic imidazolate framework). The applied in situ techniques provide complementary information. Raman spectroscopic detection focuses on the surface of the working electrode. Several adsorption processes taking place on the catalyst surface are monitored. The ZIF-8functionalization of the catalyst leads to an increased amount of adsorbed species on the electrode surface. In contrast, the in situ NMR technique detects all dissolved and sufficiently mobile 13 C-bearing species in the detection coil region containing the electrochemical cell. The applied voltages allow investigating the influence of water activation on the Pt catalyst upon the alcohol oxidation reaction. ZIF-8-functionalization of the Pt-based catalyst mainly affects the product distribution. As demonstrated by ex situ 13 C solid-state NMR spectroscopy, ethanol is adsorbed and partially immobilized by ZIF-8. Ethanol oxidation directly at the Ptcontaining catalyst is observed in NMR experiments even without an applied voltage at low loadings.

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Section: Methodsmentioning

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Role of Metal–Organic Frameworks in Moderating Platinum-Based Ethanol Electrooxidation Catalysts

et al. 2021

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“…The application of MOFs in methanol oxidation has also become a trend. Kaskel et al [122] . used ZIF‐8 functionalized Pt/Carbon catalyst, and found the ZIF‐8 functionalized catalyst only showed activity for the oxidating small molecules like methanol.…”

Section: Classification Of Catalystsmentioning

confidence: 99%

“…The application of MOFs in methanol oxidation has also become a trend. Kaskel et al [122] used ZIF-8 functionalized Pt/ Carbon catalyst, and found the ZIF-8 functionalized catalyst only showed activity for the oxidating small molecules like methanol. This induced selectivity of ZIF-8 results from the strong adsorption of large and branched alcohols on the ZIF-8 scaffold resulting in retarded diffusion of these larger molecules through the MOF coating to the active Pt nanoparticle.…”

Section: Other Transition Metal Catalystsmentioning

confidence: 99%

Research Progress on Catalysts for the Electrocatalytic Oxidation of Methanol

Ding

Dong

Tang³

2020

ChemistrySelect

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The methanol oxidation reaction has high energy density and the product is non-toxic and harmless (CO 2 , H 2 O), making it become one of the targets of new fuel energy. To maximize the efficiency of the reaction, its key lies in the development of highly efficient catalysts. In this paper, we reviewed the types of methanol electrocatalytic oxidation catalysts in recent years, some new preparation methods, and the reaction mechanism of different types of catalyst systems, and discussed their structure-activity relationships, laying the foundation for the development of highly efficient new catalysts in the future. And this paper is included on the types of catalysts (Pt-based catalyst, Ni-based catalyst, and other transition metal-based catalyst) and preparation methods (Reduction method, sol-gel method, in-situ method), and discussed the catalytic mechanism which mainly starts from two aspects, one is adsorptiondesorption, the other is the bond between the catalyst, methanol, and the medium. Finally, the future challenges and opportunities of the electrocatalytic oxidation of methanol are discussed.

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Surface‐Degenerate Semiconductor Photocatalysis for Efficient Water Splitting without Sacrificial Agents via a Reticular Chemistry Approach

Shiuan Ng,

Raja Mogan,

Lee

et al. 2023

Angewandte Chemie

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The production of green hydrogen through photocatalytic water splitting is crucial for a sustainable hydrogen economy and chemical manufacturing. However, current approaches suffer from slow hydrogen production (<70 μmol ⋅ gcat−1 ⋅ h−1) due to the sluggish four‐electrons oxygen evolution reaction (OER) and limited catalyst activity. Herein, we achieve efficient photocatalytic water splitting by exploiting a multifunctional interface between a nano‐photocatalyst and metal–organic framework (MOF) layer. The functional interface plays two critical roles: (1) enriching electron density directly on photocatalyst surface to promote catalytic activity, and (2) delocalizing photogenerated holes into MOF to enhance OER. Our photocatalytic ensemble boosts hydrogen evolution by ≈100‐fold over pristine photocatalyst and concurrently produces oxygen at ideal stoichiometric ratio, even without using sacrificial agents. Notably, this unique design attains superior hydrogen production (519 μmol ⋅ gcat−1 ⋅ h−1) and apparent quantum efficiency up to 13‐fold and 8‐fold better than emerging photocatalytic designs utilizing hole scavengers. Comprehensive investigations underscore the vital role of the interfacial design in generating high‐energy photoelectrons on surface‐degenerate photocatalyst to thermodynamically drive hydrogen evolution, while leveraging the nanoporous MOF scaffold as an effective photohole sink to enhance OER. Our interfacial approach creates vast opportunities for designing next‐generation, multifunctional photocatalytic ensembles using reticular chemistry with diverse energy and environmental applications.

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Selective Alcohol Electrooxidation by ZIF-8 Functionalized Pt/Carbon Catalyst

Cited by 26 publications

References 49 publications

The Role of Metal–Organic Frameworks in Moderating Platinum-Based Ethanol Electrooxidation Catalysts

The Role of Metal–Organic Frameworks in Moderating Platinum-Based Ethanol Electrooxidation Catalysts

Research Progress on Catalysts for the Electrocatalytic Oxidation of Methanol

Surface‐Degenerate Semiconductor Photocatalysis for Efficient Water Splitting without Sacrificial Agents via a Reticular Chemistry Approach

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