Supercapacitors have been widely explored as electrical energy storage devices because of the long cycle life, high power density, and high charge-discharge rate. [1] Compared to the electrical double-layer capacitor, pseudocapacitors (PCs), featuring

Utilization of metal-organic frameworks (MOFs) as electrodes for energy storage/conversion is challenging because of the low chemical stability and poor electrical conductivity of MOFs in electrolytes.Ananoscale MOF, Co 0.24 Ni 0.76 -bpa-200, possessing ultrahigh stability with uncommon semiconductor behavior (s = 4.2 10 À3 Sm À1 )w as fabricated. The MOF comprises ar obust hydrophobic paddlewheel and an optimized Co/Ni ratio,with consequent control over MOF size and the degree of conjugation of the coligand. AD FT study revealed that appropriate Ni 2+ doping reduces the activation energy of the system, thus providing ah igher carrier concentration, and the strongly delocalized N-donor ligand notably increases the metal-ligand orbital overlap to achieve efficient charge migration, leading to continuous through-bond (-CoNi-N-CoNi-) 1 conduction paths.These structural features endow the MOF with agood cycling stability of 86.5 %(10 000 cycles) and ahigh specific capacitance of 1927.14 Fg À1 among pristine MOF-based electrodes.

Host–Guest interaction is crucial to the sensitivity of heterogeneous sensors. Here, a series of isomorphic three-dimensional lanthanide metal–organic frameworks (Ln-MOFs), [Ln­(TCBA)­(H2O)2]2·DMF [H 3 TCBA = tris­(3′-carboxybiphenyl)­amine; Ln = Tb (1), Eu (2), and Gd (3); DMF = dimethylformamide] was synthesized and characterized, in which the propeller-like TCBA 3– ligands adopt special torsional link between Tb­(III) ions to form one-dimensional triangular channels. Optical experiments show that 1 exhibits bright green luminescence with an overall quantum yield of 26%, a 5D4 lifetime of 478 μs, and can act as an excellent heterogeneous fluorescent sensor to detect 2,4,6-trinitrophenol (TNP) explosive with an extremely low detection limit of 1.64 ppb. Because the confined channels within 1 exhibit matched dimensions toward TNP and feature multiple guest-response sites including rich π-conjugated groups, electron-donating N centers, and open metal nodes, strong host–guest interactions between 1 and TNP are captured and accurately determined by online microcalorimetry, which provides a distinctive thermodynamic perspective to understand the heterogeneous sensing behaviors. Additionally, the finely modulated heterometallic isomorphism [Tb0.816Eu0.184(TCBA)­(H2O)2]2·DMF emits bright white light when excited at 380 nm and could potentially be used as single-phase white light-emitting diode phosphors materials.