Mechanically robust double-crosslinked network functionalized graphene/polyaniline stiff hydrogels for superior performance supercapacitors

Abstract

The double-network mechanical enhancement mechanism is employed for the first time to fabricate double-crosslinked network functionalized graphene/polyaniline stiff hydrogels for high-performance structural supercapacitors.

Green Synthesis of Free Standing Cellulose/Graphene Oxide/Polyaniline Aerogel Electrode for High Performance Flexible All-solid-state Supercapacitors

“…Specifically, electrochemical impedance spectroscopy (EIS) spectra were conducted over a frequency range of 10 mHz to 100 kHz by with an AC sinusoid signal of 5 mV amplitude. To calculate the areal specific capacitance (Cs in mF cm -2 ) and Coulombic efficiency (η), the following equations were used [35][36][37]:…”

Six Isomorphous Window‐Beam MOFs: Explore the Effects of Metal Ions on MOF‐Derived Carbon for Supercapacitors

“…As shown in Figure 1a,t wo Ni II ions both have an octahedral coordinatione nvironment. Ni1, situated on the inversion center, is equatorially coordinated by two synanti carboxylic groups (O6-C27-O5) from distinct btc 3À ions, and two nitrogen atoms from individual bibp molecules with NiÀOd istance of 2.096 (2) and NiÀNd istance of 2.056(3) , respectively.T he axial positions are occupied by two water molecules with ab ond length of 2.085 (3) .N i2 lies in ad istorted octahedral coordination sphere, which is composed of two chelating carboxylic groups (O1-C25-O2 and O3-C26-O4), one syn-anti carboxylic group (O5-C27-O6) and one imidazole ring of bibp. The coordinationb ond lengths of Ni2ÀOr ange from 2.053(3) to 2.232(3) ,a nd Ni2ÀNd istance is 2.031(3) , which are all comparable with those observed in related Ni II polymericstructures (Table S1 in Supporting Information).…”

“…The topology-simplified strategy, as stated above, was still employed to analyze the complicated structure, and meanwhilet he bibp ligand was viewed as an additional linker.T he double-btc unit, other than the six Ni2 ions, is also bridged with another two equivalentunits through the bibp linker,a nd thus acts as an 8-connected node, whereas, the Ni2 ion turns into a4 -connected node because of the bibp linker between two Ni2 ions. As aresult, the overall topology can be described as ab inodal (4,8)-connected network with the Schäfli symbol of [4.5.6 3 .7] 2 ·[4 2 .5 6 .6 16 .7 3 .8] (Figure 2b). In btc 3À -related MOFs,t he polycarboxylic ligand is usually viewed asanode to simplify the topologies of MOFs, [26,29] and the previously reported Ni-MOF was also adopted by this btcnode strategy to give at rinodal network.…”

“…Currently,e lectrical double layer capacitors (EDLCs) have attracted plentyo fa ttention, and are regarded as the most favorable power source for portable electronic devices and electric vehicle energy storaged evices. [1][2][3] Due to high porosity, porousc arbons( activatedc arbon, carbon nanotube, graphene, etc.) have been extensively exploited as electrode materials of EDLCs, which provide large accessible surface area for electrolyte transportation and accommodation.…”

“…From mixed ligands of 1,3,5-benzenetricarboxylate acid (H 3 btc) and 4,4'-bis(imidazol-1-yl)biphenyl (bibp), we delicately synthesized six isomorphous MOFsw ith au nique formula {[M 3 (btc) 2 (bibp) 2 (H 2 O) 2 ]·3H 2 O} 1 (M = Zn II ,C d II ,N i II ,C o II ,M n II and Cu II ), which exhibit a3 Dw indow-beam architecturew ith the Schäfli symbol of [4.5.6 3 .7] 2 ·[4 2 .5 6 .6 16 .7 3 .8],b ased on (4,8)-connectedn odes. The series of MOFs have been employed as precursors to prepare MOFs-derived carbon through the calcination-thermolysis procedure, which present three different morphologies, that is, porous carbon( PC), graphitized carbon( GC) and carbon (C).…”