Enhancing electrochemical performance of ultrasmall Fe2O3-embedded carbon nanotubes via combusting-induced high-valence dopants

Polypyrrole-Coated Low-Crystallinity Iron Oxide Grown on Carbon Cloth Enabling Enhanced Electrochemical Supercapacitor Performance

“…The high-resolution Fe 2p spectrum of Fe 2 O 3 /CC ( Figure 2 a) exhibits two peaks with binding energies (BEs) of 711.5 and 725.1 eV, corresponding to Fe 2p 3/2 and Fe 2p 1/2 , respectively. The Fe 2p 3/2 and Fe 2p 1/2 peaks with 13.6 eV peak separation are attributed to the typical doublet peaks of Fe 3+ , implying the existence of an Fe 3+ species [ 10 ]. This can be further confirmed by the satellite peak of Fe 2p 3/2 with BEs at 719.1 eV [ 17 , 35 ].…”

“…The high-resolution O 1s spectrum of Fe 2 O 3 /CC ( Figure 2 b) shows three peaks. The peaks with BEs at around 530.4, 531.9, and 533.2 eV are assigned to lattice oxygen, chemisorbed oxygen, and physically adsorbed oxygen, respectively [ 10 , 37 ]. Among them, the chemisorbed oxygen, such as O − , O 2− , and O 2 2− on the surfaces of materials, is attributed to the adsorption oxygen on the unpaired electrons generated by the surface defects.…”

“…However, the energy storage mechanism of EDLCs occurs at the surface of the electrode, which is responsible for the EDLCs’ poor capacity compared with batteries [ 8 , 9 ]. In addition, according to the equation E = 1/2CV 2 , constructing asymmetric supercapacitor devices (ASCs) can widen the operating voltage window and enhance the energy density [ 10 ]. However, the capacitance of ASCs is mainly limited by the inferior capacitance of negative materials.…”

Elucidation of single atom catalysts for energy and sustainable chemical production: Synthesis, characterization and frontier science

“…Both Pt 1 /FeOx and Ir 1 /FeO x catalysts showed extraordinary catalytic performance for WGS, presenting a specific rate The progression of catalyst development from bulk nanoparticles to advanced support materials and single atom catalysts. Micrograph of (a) mono-functional 2.5%Ru5A catalysts [6] (adapted with permission from Elsevier b.v.), (b) bi-functional 2.5%Ru2.5%Ni5A catalysts [6] (adapted with permission from Elsevier b.v.), (c) bi-functional Co-ZnO-TUD-1 catalysts [7](adapted with permission from Springer Nature), (d) Ti-FeO-CNT catalyst via SEM [8](adapted with permission from Elsevier b.v.), (e) FeO-CNT via TEM [8](adapted with permission from Elsevier b.v.), (f) UiO-66-NH 2 MOF catalysts [9] (adapted with permission from Elsevier b.v.), (g) Ag@MOF-5 catalysts [10] (adapted with permission from Elsevier b.v.), (h) VS 2 /MoS 2 catalysts, where R1 represents the (002) and ( 100) crystal planes of MoS 2 , while R2 and R3 represent the ( 101) and ( 100) crystal planes of VS 2 [11] (adapted with permission from American Chemical Society), (i) VS 2 /MoS 2 catalysts showing position of VS 2 and MoS 2 [11] (adapted with permission from American Chemical Society), (j) Pt 1 /TiO 2 catalysts [11] (adapted with permission from Elsevier b.v.), (k) Zn 1 -N-C catalyst [12] (adapted with permission from Royal Society of Chemistry).…”

Fe2O3/Porous Carbon Composite Derived from Oily Sludge Waste as an Advanced Anode Material for Supercapacitor Application

“…Yue et al [ 29 ] synthesized the Fe 2 O 3 /CNTs composite with shell-core architecture with the microwave-assisted method. The CNTs substrate significantly improved the conductivity of the composite material, and the capacitance performance was enhanced compared to the pure Fe 2 O 3 electrode material [ 30 , 31 ]. However, the electrochemical performance of these composites might be affected because of poor contact [ 32 , 33 , 34 , 35 ].…”