Abstract:Ni-doped MoS 2 thin films were fabricated by electrodeposition from electrolytes containing both MoS 4 2− and varying concentrations of Ni 2+ , followed by annealing at 400 °C for 2 h in an Ar atmosphere. The film resistivity decreased from 32.8 μΩ-cm for un-doped MoS 2 to 11.3 μΩ-cm for Ni-doped MoS 2 containing 9 atom% Ni. For all Ni dopant levels studied, only the X-ray diffraction (XRD) pattern expected for MoS 2 is observed, with the average grain size increasing with increasing Ni content. Ni-doped MoS 2… Show more
“…In addition, the effects of various parameters controlling the electrochemical properties and morphology of the chalcogenides synthesized via the electrodeposition method were addressed. The table shows the potential activity of electrodeposited TMCs as compared to other electrode materials [75–97] …”
Section: Conclusion and Future Perspectivesmentioning
High‐performance supercapacitive electrode materials have received significant attention from researchers worldwide, thus aiming for comparable performance similar to the extensively used rechargeable batteries. For emerging energy storage technologies like flexible supercapacitors, transition metal chalcogenides (TMCs) have been in the spotlight due to their promising electrochemical features compared to other electrode materials. Among the synthesis techniques, electrodeposition‐mediated preparation of thin films of TMCs offered an affordable binder‐free approach for electrode fabrication that effectively improved the supercapacitor performance. Hence, this review mainly focussed on the electrodeposition‐based syntheses of single/ multinary chalcogenides and their composites for supercapacitors applications. Further, the effects of different deposition parameters were discussed for boosting the supercapacitor performance. Finally, this review outlined the existing challenges and future perspectives in this research domain, which will assist the upcoming exploration in the energy storage field.
“…In addition, the effects of various parameters controlling the electrochemical properties and morphology of the chalcogenides synthesized via the electrodeposition method were addressed. The table shows the potential activity of electrodeposited TMCs as compared to other electrode materials [75–97] …”
Section: Conclusion and Future Perspectivesmentioning
High‐performance supercapacitive electrode materials have received significant attention from researchers worldwide, thus aiming for comparable performance similar to the extensively used rechargeable batteries. For emerging energy storage technologies like flexible supercapacitors, transition metal chalcogenides (TMCs) have been in the spotlight due to their promising electrochemical features compared to other electrode materials. Among the synthesis techniques, electrodeposition‐mediated preparation of thin films of TMCs offered an affordable binder‐free approach for electrode fabrication that effectively improved the supercapacitor performance. Hence, this review mainly focussed on the electrodeposition‐based syntheses of single/ multinary chalcogenides and their composites for supercapacitors applications. Further, the effects of different deposition parameters were discussed for boosting the supercapacitor performance. Finally, this review outlined the existing challenges and future perspectives in this research domain, which will assist the upcoming exploration in the energy storage field.
“…The ability to control the sulfur-to-molybdenum ratio has implications for improving the oxidation properties of electrodeposited solid lubricants, as environmental constituents bond at defect and edge sites on MoS 2 , causing oxidation, 43 increased friction, 44 and premature coating failure. 45 A further benefit of electrodeposited MoS 2 coatings from aqueous solutions is the ability to modify the microstructure and film properties by adding metal dopants such as nickel 46 in the form of NiSO 4 . The addition of dopants to modify film morphology using electrodeposition is a highly desirable processing trait and, in the case of tribological coatings, has only been readily achievable through PVD methods.…”
Deposition of molybdenum disulfide (MoS 2 ) coatings using physical vapor deposition (PVD) and mechanical burnishing has been widely assessed for solid lubricants in space applications but still suffers from line-of-sight constraints on complex geometries. Here, we highlight one of the first demonstrations of electrodeposited Mo x S y O z and Mo x S y O z /Ni thin-film coatings from aqueous solutions of ammonium tetrathiomolybdate for solid lubricant applications and their remarkable ability to provide low coefficients of friction and high wear resistance. Characterization of the coating morphology shows amorphous microstructures with a high oxygen content and cracking upon drying. Even so, electrodeposited Mo x S y O z can achieve low steady-state coefficients of friction (μ ∼ 0.05−0.06) and wear rates (2.6 × 10 −7 mm 3 /(N m)) approaching those of physical vapor deposited coatings (2.3 × 10 −7 mm 3 /(N m)). Additionally, we show that adding dopants such as nickel increased the wear rate (7.5 × 10 −7 mm 3 /(N m)) and initial coefficient of friction (μ i = 0.23) due to compositional modifications such as dramatic sub-stoichiometry (S/Mo ∼ 1) and expression of a NiO x surface layer, although doping did reduce the degree of cracking upon drying.
“…For instance, hard ceramic particles such as carbides [7,8], carbon nanotubes [9], oxides [10,11], borides [12], and nitrides [13] are selected as enhancing phases for MMCs to gain better mechanical and wear properties. Self-lubricating particles like graphene [14], sulphides [15,16], h-BN [17,18], etc. are chosen to improve the wear and anti-corrosion performance.…”
Metal matrix composite coatings have attracted scientific and engineering interest because of their excellent mechanical properties. Nano-Si3N4 reinforced nickel coatings with different ceria contents were fabricated by electrodeposition. The microstructures, hardness, and tribological properties as well as corrosion behaviors of the composite coatings were studied in detailed. The results show that incorporation of ceria nanoparticles into the nickel matrix can decrease the grain size and facilitate the (111) texture of the coatings, leading to a smooth surface, compact microstructure, and dispersion-strengthening composites. The 6CeO2 coating with the highest hardness of 520 HV50g demonstrates the best wear resistance, while the 3CeO2 coating shows the best corrosion resistance with the smallest i corr value of 0.0972 μA/cm2. The study suggests a significant improvement in mechanical and anti-corrosion properties by incorporation with the ceria nanoparticles, which has important implications for the surface protection of engineering materials.
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