The electrochemical splitting of water provides an attractive method for the production of hydrogen fuels. Unfortunately, the slow kinetics of oxygen evolution (OER) on the anode side of the electrolyzer hinders the efficient and large-scale hydrogen production. In this study, starting from metal-organic frameworks (MOFs), a series of bimetal phosphides CoFeP (x = 0.33, 0.50, 0.66, 0.75 and 0.80) were synthesized by low-temperature phosphidiation of corresponding MOFs precursors. The as-prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Studies indicate that the proportion of cobalt and iron elements make a big differences on the structure of the materials. Benefiting from the porous structure and large specific area of the MOFs precursors, as well as the synergistic effect between Co and Fe elements, the as-synthesized CoFeP shows superior electrocatalytic performances and outstanding stability toward OER in alkaline solution.
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http://dx.doi.org/10.1016/j.jcis.2019.07.008 | DOI Listing |
J Colloid Interface Sci
December 2024
College of Chemistry and Materials Science, Hebei Research Center of the Basic Discipline of Synthetic Chemistry, Chemical Biology Key Laboratory of Hebei Province, Hebei University, Baoding 071002, PR China; Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of the Ministry of Education, State Key Laboratory of New Pharmaceutical Preparations and Excipients, Baoding 071002, PR China. Electronic address:
Mikrochim Acta
December 2024
Department of Chemistry, Yazd University, Yazd, 89195-741, Iran.
An electrochemical aptasensor has been developed specifically for the sensitive and selective determination of ochratoxin A (OTA), one of the most important mycotoxins. The aptasensor utilizes a glassy carbon electrode that has been modified with toluidine blue (TB) encapsulated in a Zn-based metal-organic framework (TB@Zn-MOF). The results demonstrate that in the presence of OTA, the peak current of the differential pulse voltammogram (DPV) related to TB oxidation is notably decreased.
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December 2024
Shanghai University of Medicine & Health Sciences, Shanghai, 201318, China.
A novel electrochemiluminescence (ECL) biosensor was developed for the ultrasensitive detection of miRNA-155, based on the synergistic combination of multifunctional nanomaterials. The biosensor employed a conductive metal-organic framework (MOF), Ni(HAB) (HAB = hexaaminobenzene), as the substrate material. The unique π-electron conjugated structure of Ni(HAB) endowed the biosensor with excellent electron transport properties, significantly enhancing its sensitivity.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
Key Laboratory of Eco-chemical Engineering, International Science and Technology Cooperation Base of Eco-chemical Engineering and Green Manufacturing, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China. Electronic address:
Despite the ultrahigh theoretical energy density and cost-effectiveness, aprotic lithium-oxygen (Li-O) batteries suffer from slow oxygen redox kinetics at cathodes and large voltage hysteresis. Here, we well-design ultrafine Co nanoparticles supported by N-doped mesoporous hollow carbon nanospindles (Co@HCNs) to serve as efficient electrocatalysts for Li-O battery. Benefiting from strong metal-support interactions, the obtained Co@HCNs manifest high affinity for the LiO intermediate, promoting formation of ultrathin nanosheet-like LiO with low-impedance contact interface on the Co@HCNs cathode surface, which facilitates the reversible decomposition upon charging.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
School of Environmental and Chemical Engineering, Jiangmen Key Laboratory of Synthetic Chemistry and Cleaner Production, Institute of Carbon Peaking and Carbon Neutralization, Wuyi University, Jiangmen 529020, China; Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang 515200, China. Electronic address:
Although Z-scheme heterojunction composites have been widely studied in photocatalysis, in-depth investigation of oxygen vacancies (Ov) in the Z-scheme photocatalysts is still rare. Herein, an oxygen vacancies modified NU-1000/BiOCl-Ov composite with Z-scheme heterojunction was rationally designed and fabricated. The combination of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) experiment verified the presence of oxygen vacancies, meanwhile the Z-scheme charge transfer across the heterojunction interface was confirmed in detail by the in situ-XPS, Kelvin probe force microscope (KPFM) studies, ultraviolet photoelectron spectroscopy (UPS), EPR radical capture experiment, as well as density functional theory (DFT) calculation.
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