Facile heterogenization of a cobalt catalyst via graphene adsorption: robust and versatile dihydrogen production systems

Eady, Shawn C.; Peczonczyk, Sabrina L.; Maldonado, Stephen; Lehnert, Nicolai

doi:10.1039/c4cc02920h

Cited by 40 publications

(61 citation statements)

References 14 publications

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“…Depending on the methodo fi mmobilization, the heterogenized molecular catalystc an be removed from the electrode surfacea nd reused, whichi sn ecessary for energy-converting applications. Covalent attachment, [22][23][24][25] electropolymerization, [26][27][28][29][30] and adsorption/noncovalent attachment of metal complexes [31][32][33][34][35] are methods of heterogenizing molecular catalysts for energy-conversion applications and were reviewed elsewhere. [36][37][38]…”

Section: Molecular Electrocatalysts For Energy Conversionmentioning

confidence: 99%

Electrocatalytic Metal–Organic Frameworks for Energy Applications

2017

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With the global energy demand expected to increase drastically over the next several decades, the development of a sustainable energy system to meet this increase is paramount. Renewable energy sources can be coupled with electrochemical conversion processes to store energy in chemical bonds. To promote these difficult transformations, electrocatalysts that operate at high conversion rates and efficiency are required. Metal–organic frameworks (MOFs) have emerged as a promising class of materials; however, the insulating nature of MOFs has limited their application as electrocatalysts. The recent development of conductive MOFs has led to several electrocatalytic MOFs that display activity comparable to that of the best‐performing heterogeneous catalysts. Although many electrocatalytic MOFs exhibit low activity and stability, the few successful examples highlight the possibility of MOF electrocatalysts as replacements for noble‐metal‐based catalysts in commercial energy‐converting devices. We review herein the use of pristine MOFs as electrocatalysts to facilitate important energy‐related reactions.

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Section: Molecular Electrocatalysts For Energy Conversionmentioning

confidence: 99%

Electrocatalytic Metal–Organic Frameworks for Energy Applications

2017

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“…Yet many homogeneous catalytic systems are still being designed with synthetically challenging and costly ligand manifolds which are unsuitable for implementation at scale . An ideal system would require minimal synthetic effort, only inexpensive compounds or materials, and have the capability to be directly tied to a renewable energy source to produce clean H 2 without further modification …”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Hydrogen Production Based on a Serial Metal‐Salen Complexes and the Reaction Mechanism

Chu

et al. 2019

ChemCatChem

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Three metal-salen (Ni, Cu, Zn) complexes were firstly introduced into homogeneous photocatalytic hydrogen-evolution systems. Based on these complexes, we developed noble-metal-free hydrogen production systems using disodium salts of Eosin Y (EY 2À ) as photosensitizers and trimethylamine (TEA) as sacrificial donors. In a Ni(II)-salen/EY 2À /TEA system, a TON of 362 based on Ni(II)-salen was achieved in 5.5 h with one time complement for EY 2À . The stability study revealed the quick photodecomposition of EY 2À in the presence of ether Ni(II)-salen, TEA or both chemicals, and quick dehalogenation of EY 2À was observed in the presence of TEA under irradiation. Besides, relatively slower photodecomposition of Ni(II)-salen was also found. These factors should be responsible for the deactivation of the photolysis system. Investigation of electrocatalytic proton reduction by Ni(II)-salen showed a CECE mechanism. An overall catalytic rate constant of 7.62 × 10 6 M À 2 s À 1 was achieved. Combined with the stability analysis, photo-induced electron transfer and electrochemistry investigation, for the first time, the photocatalytic hydrogen production mechanism for metalsalen complexes (e. g. Ni(II)-salen) was proposed.[a] Dr.

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“…Methanol Surface Recombination Velocity Measurement A custom-built microwave photoconductivity system [38,39] was used to measure the minority carrier lifetime in Si wafer sections after various surface treatments. Float-grown Si with low resistivity (R > 13000 ohm cm) and a thickness of 0.046 cm was used exclusively for these measurements.…”

Section: Methodsmentioning

confidence: 99%

Chemically modified Si(111) surfaces simultaneously demonstrating hydrophilicity, resistance against oxidation, and low trap state densities

2016

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Chemically modified Si(111) surfaces have been prepared through a series of wet chemical surface treatments that simultaneously show resistance towards surface oxidation, selective reactivity towards chemical reagents, and areal defect densities comparable to unannealed thermal oxides. Specifically, grazing angle attenuated total reflectance infrared and X-ray photoelectron (XP) spectroscopy were used to characterize allyl-, 3,4-methylenedioxybenzene-, or 4-[bis(trimethylsilyl)amino]phenyl-terminated surfaces and the subsequently hydroxylated surfaces. Hydroxylated surfaces were confirmed through reaction with 4-(trifluoromethyl)benzyl bromide and quantified by XP spectroscopy. Contact angle measurements indicated all surfaces remained hydrophilic, even after secondary backfilling with CH 3-groups. Surface recombination velocity measurements by way of microwave photoconductivity transients showed the relative defectcharacter of as-prepared and aged surfaces. The relative merits for each investigated surface type are discussed.

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Facile heterogenization of a cobalt catalyst via graphene adsorption: robust and versatile dihydrogen production systems

Cited by 40 publications

References 14 publications

Electrocatalytic Metal–Organic Frameworks for Energy Applications

Electrocatalytic Metal–Organic Frameworks for Energy Applications

Photocatalytic Hydrogen Production Based on a Serial Metal‐Salen Complexes and the Reaction Mechanism

Chemically modified Si(111) surfaces simultaneously demonstrating hydrophilicity, resistance against oxidation, and low trap state densities

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