Combined electrochemical and DFT investigations of iron selenide: a mechanically bendable solid-state symmetric supercapacitor

Abstract

Enhanced energy storing capability with the aid of unique nanostructured morphology is beneficial to enrich the effective path for the development of energy storing capability of supercapacitors. Scheming earth abundant...

Cerium Selenide Nanopebble/Multiwalled Carbon Nanotube Composite Electrodes for Solid-State Symmetric Supercapacitors

“…The peaks related to the carbonyl group (CO) and the carboxyl group (OC−OH) are indicated by the binding energies of 285.9 and 289.4 eV, respectively. 57 The composite nanostructure shows a BET surface area of 83.5 m 2 /g, which is much higher than that of cerium selenide (41.5 m 2 /g), 21 as shown in Figure S2. Thus, the typical nanostructured morphology of cerium selenide onto MWCNTs improves the surface area, exhibiting an enhanced electrochemical performance of the composite electrode.…”

“…Growth of cerium selenide was accomplished with the aid of SILAR . An aqueous cationic precursor was prepared using 20 mM cerium nitrate (Ce­(NO 3 ) 3 ) complexed using dropwise addition of triethanolamine TEA (C 6 H 15 NO 3 ), resulting in a light-yellow color.…”

“…Growth of cerium selenide was accomplished with the aid of SILAR. 21 An aqueous cationic precursor was prepared using 20 mM cerium nitrate (Ce(NO 3 ) 3 ) complexed using dropwise addition of triethanolamine TEA (C 6 H 15 NO 3 ), resulting in a light-yellow color. The anionic precursor was extracted using filtration after refluxing crushed selenium (5 g) and sodium sulfite (15 g) in deionized water (200 mL) at 90 °C for 9 h. The prepared precursors were maintained at 60 °C with 100 rpm stirring, and the stainless steel (SS) substrate was dipped vertically.…”

Designing Na2Zn2TeO6-Embedded 3D-Nanofibrous Poly(vinylidenefluoride)-co-hexafluoropropylene-Based Nanohybrid Electrolyte via Electrospinning for Durable Sodium-Ion Capacitors

“…This is due to the reason that higher current density does not provide the charge carriers enough time to migrate through the pores. The electrolyte ions only approach only toward the external surface at higher current density, whereas at lower current density, the electrolyte ions get enough time to intrude deeper inside the electrodes and interact with more active interfacial sites to make them fully charged or discharged. , The electrode materials are not able to participate efficiently during electrochemical reactions when subjected to high current density. Additionally, a decrease in effective thickness of the electrical double layer with the increased current densities is also a primary reason.…”

Remarkable Effect of Fe and Se Composition on Magnetic Properties─Comparative Study of the Fe–Se System at the Nanoscale

“…The selenides of iron have attracted much interest in recent years because of their exciting and unique thermal, electronic, optical, and magnetic properties. − The richness of physical properties also comes from the richness in the stoichiometric phases these families of compounds may exhibit. The Fe–Se system shows various stable polymorphs under ambient conditions, including FeSe 2 , Fe 3 Se 4 , Fe 7 Se 8 , and FeSe. − Hagg and Kindstrom’s original article referred to the iron selenides as a α-phase (FeSe x in a PbO-type structure with x up to 8/7) and β-phase (FeSe x in a NiAs-type structure with x ∼ 8/7–4/3) .…”