Y. Arooj^a, A. Farhan^b, S. Maqsood^a,c, A. Erum^a, M. Ishaq^d, S. Rafique^a, A. Khalid^b, F. Wazahat^a, M. A. Qamar^e,*

Chalcogenide Letters, Vol.22, No.8, pp. 707-717, 2025, DOI:10.15251/CL.2025.228.707

Abstract Chemical co-precipitation synthesis was used to make pure and zirconium-doped cobalt sulfide (Co3S4) nanoparticles (NPs). Important characterizations such as FTIR, UV-VIS, Raman, PL, SEM, XRD, and four probe methods were used to examine the influence of the Zr (0%, 5%, 10%, 15%, and 20%) doping on optical, electrical, structural, and thermoelectric characteristics of Co₃S₄ NPs. X-ray diffraction and SEM examination verified the cubic structure and grain size of pure and Zr-doped Co₃S₄-NPs. The FTIR spectrum revealed the rotational and vibrational modes linked to the material's surface. The material is optimal for photocatalytic activity with a redshift More >

Lianyuan Ji¹, Mingchen Shi¹, Zengkai Feng², Hui Yang^1,*

Journal of Renewable Materials, Vol.12, No.2, pp. 259-274, 2024, DOI:10.32604/jrm.2023.030599 - 11 March 2024

Abstract

Cobalt sulphides attract much attention as anode materials for Li-ion batteries (LIBs). However, its poor conductivity, low initial column efficiency and large volume changes during cycling have hindered its further development. Herein, novel interlaced CoS nanosheets were firstly prepared on Carbon Fiber Cloth (CFC) by two hydrothermal reactions followed with carbon coating via carbonizing dopamine (CoS NS@C/CFC). As a freestanding anode, the nanosheet structure of CoS not only accommodates the volume variation, but also provides a large interface area to proceed the charge transfer reaction. In addition, CFC works as both a three-dimensional skeleton and an

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N. V. Urusova^a,*, A. I. Merentsov^b,c, E. A. Stepanova^a,c, O. G. Reznitskikh^a

Chalcogenide Letters, Vol.20, No.5, pp. 343-351, 2023, DOI:10.15251/CL.2023.205.343

Abstract Co_xTiS₂ (x = 0.20, 0.30, 0.50, 0.75) compounds have a layered crystal structure with Ti atoms surrounded by the S octahedrons in the S-Ti-S layers and Co ions which could be surrounded both by the S octahedrons and tetrahedrons. The features of the crystal structure and magnetic properties of the polycrystalline Co_xTiS₂ samples were studied as a function of the cobalt concentration using X-ray diffraction and magnetization measurements. The disordered state of the Co atoms (x < 0.20) changes to the ordered one (x ≥ 0.20). The magnetic ordering arises at x = 0.20 with mostly More >

Dongfang Huang^1,4, Peng Lv^1,2,3,4,*, Changlin Zhong^1,2, Xingsheng Zhou^1,2, Zhichen Liu⁴

Journal of Renewable Materials, Vol.11, No.3, pp. 1383-1400, 2023, DOI:10.32604/jrm.2022.023261 - 31 October 2022

Abstract In this work, the microstructure, hydrogen storage properties, anti-oxide ability and rate limiting step of Zr(Cr_1−xCo_x)₂ (x = 0, 0.2, 0.4 and 0.6) alloys have been investigated. After studying the crystal structure, we found that all alloy samples could show C14-type phase but the alloy sample x = 0 could also show a small amount of Cr phase. Rietveld fitting showed that lattice parameter and unit cell volume of C14-type phase decreased with increasing x. After further research, it was clear that the first hydrogen absorption capacity decreased with increasing x. But introducing more Co content had a positive influence More >

Kittithad Wonglekha^1,#, Weerachon Tolek^1,#, Okorn Mekasuwandumrong², Wasu Chaitree², Piyasan Praserthdam¹, Kiat Moon Lee³, Joongjai Panpranot^1,3,4,*

Journal of Renewable Materials, Vol.10, No.8, pp. 2055-2072, 2022, DOI:10.32604/jrm.2022.019680 - 25 April 2022

Abstract An effect of phase compositions (rutile, Rut and anatase, Ant) of TiO₂ supports on the selective hydrogenation of furfural to furfuryl alcohol was investigated. The 15%wt Ni/TiO₂ catalysts were prepared by incipient impregnation method. The result showed that Ni supported on anatase-rutile mixed phase TiO₂ (91% Rut and 9% Ant, A2) provided the highest furfuryl alcohol yield at 43.8% due to the relatively strong Ni-TiO₂ interaction, its appropriate crystallite sizes, and high average pore sizes. Furthermore, the effect of cobalt as a promoter on Ni/ TiO₂-A2 catalysts was studied. The result showed that the Ni-Co/TiO₂-A2 catalysts exhibited poorer More > Graphic Abstract

Waris Ali¹, Asif Ali Shaikh¹, Feroz Shah¹, Sajjad Hussain^2,3,*

CMES-Computer Modeling in Engineering & Sciences, Vol.130, No.1, pp. 255-268, 2022, DOI:10.32604/cmes.2022.017313 - 29 November 2021

Abstract A novel trapezoidal design for storage of heat energy through melting of phase-change material (PCM) is investigated. Latent heat thermal energy storage system (LHTES) is a promising option to diminish mis-match between energy consumption and supply. For this purpose, Paraffin: Rubitherm-35 (RT35) material is successively melted in aluminum structure which is heated from one side and the other sides are kept adiabatic. Melting of PCM is observed experimentally and melt fronts are photographed for various time lengths. The fluid-solid module in COMSOL Multiphysics 5.4 has been utilized. The transient heat conduction with enthalpy function is… More >

Yinghui Sun¹, Guojie Zhang^1,2,*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 105-105, 2019, DOI:10.32604/icces.2019.05173

Abstract A series of Co-M (M = Ce, Fe, Zr) binary oxides supported on N-doped catalysts were prepared by impregnation methods and tested for DRM reaction. Moreover, the influence of Co and Ce atomic contents in the catalysts on DRM performance was investigated. Significant enhancement of activity performance over Ce promoted 3Co-1Ce/AC-N catalyst was observed. Compared with Fe and Zr, the catalyst with 1/4 mol% of Ce showed the highest activity and was higher than the supported Co catalyst. The calcined and spent catalysts were characterized by XPS, H₂-TPR, TEM and EDX mapping studies. The characterization results… More >

MI HEON RYU^1,a, JEONG HEE PARK^1,a, JI EUN PARK¹, JIN CHUNG², CHANG HUN LEE³AND HAE RYOUN PARK^1*

BIOCELL, Vol.34, No.1, pp. 15-22, 2010, DOI:10.32604/biocell.2010.34.015

Abstract Tumor cells are often found under hypoxic conditions due to the rapid outgrowth of their vascular supply, and, in order to survive hypoxia, these cells induce numerous signaling factors. Akt is an important kinase in cell survival, and its activity is regulated by the upstream phosphoinositide 3-kinase (PI3K) and receptor tyrosine kinases (RTKs). In this study, we examined Akt activation and RTKs/PI3K/Akt signaling using the hypoxia-mimetic cobalt chloride in oral squamous carcinoma cells. Cobalt chloride increases Akt phosphorylation in both a dose- and time-dependent manner. Blocking the activation of the PI3K/Akt pathway using LY294002 abolished More >