Mesoporous LaFeO3 perovskite derived from MOF gel for all-solid-state symmetric supercapacitors

Recent advances in solid‐state supercapacitors: From emerging materials to advanced applications

“…The fabricated symmetric SSC could provide excellent specific energy of 34 Wh kg À1 at 900 W kg À1 (based on the total mass of electrodes) with good capacity retention (92.2% after 5000 cycles at 10 A g À1 ). 174 In recent years, new strategies have been emerged to synthesize conductive MOFs with high charge mobility and good electrical conductivity. 175,176 Conductive MOF Ni 3 (2,3,6,7,10,11-hexaiminotriphenylene) 2 (Ni 3 [HITP] 2 ) 177 and Cu-CAT nanowire arrays 178 have attempted to use as electrode materials for SSCs.…”

Metal–Organic Frameworks Constructed from Iron‐Series Elements for Supercapacitors

“…Fe-based MOFs as the precursor or soft template for producing SCs electrodes can be categorized as three different types: 1) Fe-based metal oxides (Fe 3 O 4 or Fe 2 O 3 ) compositing with carbon materials; [93][94][95] 2) Fe-based carbide materials; [96,97] and 3) Fe-based bimetallic metal oxides. [98][99][100][101] As to type 1, in 2014, Meng and co-workers reported a porous Fe 3 O 4 /C material decomposed from the classic MIL-88B-Fe and documented this composite as the SCs electrode. [93] Within the potential window of À1 to 0 V, a maximum capacitance of 139 F g À1 was achieved at a current density of 0.5 A g À1 , displaying superior negative electrochemical behavior.…”

“…For instance, Zhang et al reported a perovskite LaFeO 3 material with a mesopore size of 2 nm, which is derived from MIL‐101‐Fe gel. [ 100 ] Directly applying it in an all‐solid‐state SCs device with AC negative electrode, it showed an energy‐density value of 34 Wh kg −1 at a power density of 900 W kg −1 with 92.2% of capacitance maintenance after 5000 cycles, displaying better electrochemical performance than recent reports on MOF‐based derived single Fe‐based metal oxides electrodes. [ 102,103 ] Analogically, Ren and co‐workers used Co 0.8 Fe 0.2 ‐MOF‐74@rGO as the precursor to integrate Co 1− x S/CoFe 2 O 4 @rGO composite electrode.…”

Metal–Organic Frameworks and Their Derived Functional Materials for Supercapacitor Electrode Application

“…To address the issue of the poor chemical homogeneity of precursors on the basis of single‐metal MOFs, an MOF gel was used as a precursor for the preparation of LaFeO 3 with a mesoporous structure. [ 95 ] A specific capacitance of 241.3 F g −1 (1 A g −1 ) and capacitance retention of 68% (20 A g −1 ) were achieved for this perovskite‐type metal oxide. Compared with single‐metal oxides, mixed‐metal oxides, involving different metal species, display richer redox reactions and higher electrical conductivity because of the relatively low activation energy for electron transfer between cations, usually leading to an increased capacitance.…”