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Synthesis and Applications of MOFsChalcogenide-based Nanocomposites
Published in Ram K. Gupta, Tahir Rasheed, Tuan Anh Nguyen, Muhammad Bilal, Metal-Organic Frameworks-Based Hybrid Materials for Environmental Sensing and Monitoring, 2022
Shikha Bhogal, Irshad Mohiuddin, Sandeep Kumar, Promila Sharma, Asnake Lealem Berhanu, Kuldeep Kaur, Ashok Kumar Malik
Cobalt sulfide (CoS) electroactive materials find applications for energy storage purposes and MOFs can be used to derive these sulfide particles. Zeolitic imidazolate framework (ZIF) was used as a template for the synthesis of amorphous CoS nanocages [37]. The CoS nanocages were synthesized by refluxing ZIF-67 and thioacetamide in ethylene glycol. The MOF ZIF-67 acted both as template and Co precursor while thioacetamide acted as a sulfur precursor. The formation of CoS nanoparticles took place by reaction of Co2+ ions dissolving from the surface of ZIF-67 with S2- ions from thioacetamide. As the reaction continued, a separation started appearing between the ZIF-67 and the CoS shell. Finally, the ZIF-67 cores were thoroughly consumed to form well-defined hollow truncated rhombic dodecahedral nanocages of CoS. The specific capacitance of the CoS nanocages was calculated to be 1812 F g-1 and 1201 F g-1 at a scan rate of 5 mV s-1 and 50 mV s-1, respectively. The specific capacitance obtained from the galvanostatic discharge curves were 1475 F g-1 and 932 F g-1 at a current density of 1 A g-1 and 10 A g-1, respectively. The results demonstrated the high performance and utility of the developed CoS in capacitive energy storage applications.
Solvothermal preparation of nano cobalt sulfide from tris (cyclohexylpiperazinedithiocarbamato)cobalt(III) and characterization, single crystal X-ray crystal structure of the precursor
Published in Journal of Coordination Chemistry, 2020
K. Ramalingam, S. Srinivasan, C. Rizzoli
Many transition metal chalcogenides have been employed as semiconducting, optical, magnetic, and catalytic materials [1, 2]. Like NiS, cobalt sulfide can exist in several stoichiometric and non-stoichiometric phases such as Co4S3, Co9S8, CoS, Co1-XS, Co3S4, Co2S3, and CoS2 [3, 4]. Until very recently only little work has been done on CoS compared to other semi conducting transition metal sulfides. Due to the coexistence of strongly reducible cobalt and oxidizable sulfur ion, the phase diagrams are more complicated [5]. Some potential applications of cobalt sulfides are as a catalyst [6, 7], capable of splitting water to produce hydrogen [8], as a magnetic material [5, 9], as a counter electrode for solar cells [10, 11], as an anode for advanced lithium ion batteries [12, 13], and as a high performance super capacitor [14, 15]. In particular, nano CoS finds application as nano supercapacitor and as high performance counter electrode for dye-sensitized solar cells [16–19]. Traditionally solvothermal method has been employed to prepare metal sulfides from single source precursors [5, 10, 20]. A solvothermal process can be defined as a process in a closed reaction vessel inducing decomposition or a chemical reaction(s) between precursor(s) in the presence of a solvent at a temperature higher than the boiling temperature of this solvent. The pressure can be autogenous or imposed (the pressure value being higher than 1 bar at the starting point of the experiment through compression of the reaction medium) [21]. Various iron, cobalt, and nickel 1,1-dithiolates have been investigated as precursors in metal organic chemical vapor deposition [22]. We report the synthesis of nano cobalt sulfide by solvothermal decomposition of a single source precursor, a cobalt(III) dithiocarbamate, and its characterization on the basis of PXRD, HRSEM, and EDAX analysis. Single crystal X-ray structure of the single source precursor is also reported. In the present work, solvothermal preparation of nano cobalt sulfide from its precursor is accomplished under mild conditions, namely under atmospheric pressure, temperature lower than the boiling point of the solvent and in an open container.