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| http://dx.doi.org/10.1136/bcr-2019-232805 | DOI Listing |
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Effect of the Electrolyte on the Oxygen Reduction Reaction with PCN-224(Co).
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Leiden University: Universiteit Leiden, Leiden Institute of Chemistry, Einsteinweg 55, Room number EE4.19, 2333 CC, Leiden, NETHERLANDS, KINGDOM OF THE.
Electrocatalysis in metal-organic frameworks is an interplay between the diffusion of charges, the intrinsic catalytic rate, and the mass-transport of reactants through the pores. Here a systematic study is carried out to investigate the role of the electrolyte nature and concentration on the oxygen reduction reaction (ORR) with the PCN-224(Co) MOF in aqueous electrolyte. It was found that the ORR activity is slightly influenced by the nature of the ions in solution, providing that the ionic strength is high enough to minimize the resistivity during the measurement.
View Article and Find Full Text PDFSimultaneously Achieved High Piezoelectricity and High Resistivity in NaBiTiO-Based Ceramics with High Curie Temperature.
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Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China.
Good piezoelectricity and high resistivity are prerequisites for high-temperature acceleration sensors to function correctly in high-temperature environments. Bismuth layered structure ferroelectrics (BLSFs) are promising candidates for piezoelectric ceramics with excellent piezoelectric performance at high temperatures, high electrical resistivity, and high Curie temperatures (). In this study, (LiMn) is substituted for Bi at the A-site, and Ce-doping is performed to replace Ti ions in NaBiTiO, which achieves the desired combination of high piezoelectric coefficients and high resistivity.
View Article and Find Full Text PDFNon-Aqueous Electrochemical CO Reduction to Multivariate C-Products Over Single Atom Catalyst at Current Density up to 100 mA cm.
Small
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Department of Chemical Engineering, University of Illinois Chicago, Chicago, IL, 60607, USA.
Electrochemical CO reduction reaction (CO-RR) in non-aqueous electrolytes offers significant advantages over aqueous systems, as it boosts CO solubility and limits the formation of HCO and CO anions. Metal-organic frameworks (MOFs) in non-aqueous CO-RR makes an attractive system for CO capture and conversion. However, the predominantly organic composition of MOFs limits their electrical conductivity and stability in electrocatalysis, where they suffer from electrolytic decomposition.
View Article and Find Full Text PDFDual-site and carbon-ring moiety modulation of polymeric carbon nitride for improved cooperative photocatalysis.
J Colloid Interface Sci
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School of Materials Science & Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan 250022, Shandong, China. Electronic address:
The conjugated structure of graphitic polymeric carbon nitrides (GPCNs) has low efficiency in the photocatalytic hydrogen peroxide (HO) production, due to the electronic properties, band structure, and surface-active-sites. Herein, boron and carbon-ring modified GPCNs were synthesized with via a thermal condensation method, using melamine and phenylboronic acid as raw materials. The introduced boron atom, conjugated to the carbon atom in the heptazine moiety, and the adjacent nitrogen vacancy (V) formed a dual-site, which not only modified the electronic properties but also promoted the adsorption and activation of molecular dioxygen; The carbon-ring introduced altered the band structure and electron distribution, which was proved by density functional theory (DFT) calculations.
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Sun Yat-Sen University, Guangzhou 510006, China.
As a contracted porphyrin analogue, corrole shows a more acidic and trinegative/triprotic nature compared with porphyrin in the field of coordination chemistry. However, the direct introduction of corrole into a metal-organic framework is quite difficult due to its lower symmetry. Herein, we report the one-pot synthesis of a series of corrole and porphyrin-based multivariate porphyrinic metal-organic frameworks M(TCPC)@M-PCN-222 (M = Cu, Mn, FeCl; TCPC = 5,10,15-tris(4-carboxyphenyl) corrole; M = Co, Cu, Ni, FeCl) and applied them to the insertion of a Si-H bond with α-diazoacetates.
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