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Superior charge storage performance of optimized nickel cobalt carbonate hydroxide hydrate nanostructures for supercapacitor application.
Sci Rep
January 2025
Department of Physics, School of Advanced Engineering, UPES, Dehradun, India.
In our work, we report superior electrochemical performance of optimized 3D nanostructured, nickel-cobalt carbonate hydroxide hydrate (NiCo-CHH (1 ≤ x ≤ 2)) materials with flower like morphology synthesised via one-step hydrothermal methods. A Ni rich sample (x = 1) demonstrate better specific capacitance and the improvement is attributed to more oxygen deficient neighbourhood of Ni compared to that of Co. The structural, morphological and electronic properties of the samples were investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), High resolution transmission electron microscopy (HRTEM), field emission electron microscopy (FESEM), Energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS).
View Article and Find Full Text PDFStabilization of oxygen vacancy ordering and electrochemical-proton-insertion-and-extraction-induced large resistance modulation in strontium iron cobalt oxides Sr(Fe,Co)O.
Nat Commun
January 2025
Institute for Chemical Research, Kyoto University, Uji, Kyoto, Japan.
Electrochemically inserting and extracting hydrogen into and from solids are promising ways to explore materials' phases and properties. However, it is still challenging to identify the structural factors that promote hydrogen insertion and extraction and to develop materials whose functional properties can be largely modulated by inserting and extracting hydrogen through solid-state reactions at room temperature. In this study, guided by theoretical calculations on the energies of oxygen reduction and hydrogen insertion reactions with oxygen-deficient perovskite oxides, we demonstrated that the oxygen vacancy ordering in Sr(FeCo)O (SFCO) epitaxial films can be stabilized by increasing the Co content (x ≥ 0.
View Article and Find Full Text PDFAnion modulation enhances the internal electric field of CuCoO to improve the catalysis in ammonia borane hydrolysis.
J Colloid Interface Sci
December 2024
School of Materials Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, China. Electronic address:
Ammonia borane (NHBH, AB) is considered a promising chemical hydrogen storage material. The development of efficient, stable, and economical catalysts for AB hydrolysis is essential for realizing the hydrogen energy economy. In this study, a series of p-p heterojunction catalysts, labeled M (P/S/Cl)-CuCoO, were fabricated using the high-temperature vapor phase method to achieve anionic interface gradient doping.
View Article and Find Full Text PDFEffects of Trace Elements and Vitamins on the Synthesis of Steroid Hormones in Follicular Granulosa Cells of Yak.
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December 2024
College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang, Chengdu 611130, China.
Yak (), a special breed of cattle on the Qinghai-Tibet Plateau, has low fertility due to nutritional deficiency, especially the trace elements. The steroid hormones estradiol (E2) and progesterone (P4) synthesized by yak follicular granulosa cells (BGCs) are involved in the entire reproductive process. In the present study, we investigated the effects of trace elements and vitamins on yak follicular GCs, including the cellular activity, the synthesis of E2 and P4, and the expression of genes related to steroid hormone synthesis.
View Article and Find Full Text PDFPhosphorus Regulates Coordination Number and Electronegativity of Cobalt Atomic Sites Triggering Efficient Photocatalytic Water Splitting.
Nano Lett
December 2024
Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
Article Synopsis
- The study focuses on improving single-atom catalysts (SACs) for hydrogen production through photocatalysis by creating a Co-P/g-CN heterostructure.
- The synthesis involved changing the Co-O configuration to a Co-P structure, enhancing the electronic properties and charge distribution, which lowered the energy barrier for hydrogen evolution reactions (HER).
- The Co-P/g-CN catalyst exhibited a HER rate significantly higher than traditional noble metal photocatalysts and achieved an apparent quantum efficiency of 28.45% at a specific wavelength, indicating its effectiveness in photocatalytic processes.
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