Thermal Decomposition of [AH][M(HCOO)3] Perovskite-Like Formates

Abstract

A systematic study of the thermal decomposition of hybrid perovskites of formula [AH][M(HCOO)3] under inert atmosphere was performed by means of thermogravimetry and simultaneous infrared spectroscopy of the evolved gases. The influence of: (i) the metal ion of the [M(HCOO)3]- framework and (ii) the guest [AH]+ cation, in the composition of the final residue was evaluated. In this work, it has been demonstrated that these materials can be used as precursors of metal or metal-oxide compounds—obtained free of carbon—, and that the composition of the final residue is determined by the standard reduction potential of the metal cation of the framework.

A green closed-loop process for selective recycling of lithium from spent lithium-ion batteries

“…The TM formate converts to TM oxide in the range of 230 °C to 340 °C. 37–40 Therefore, the obtained formate mixture is sintered in a two-step procedure. In the first step, the mixture is sintered at 350 °C for 5 hours to convert lithium formate to lithium carbonate.…”

“…36 The transition metal formate will react with oxygen, producing metal oxide, carbon dioxide, and water (eqn (3)–(5)). 37–40 2HCOOLi + O 2 → Li 2 CO 3 + CO 2 ↑ + H 2 ONi(HCOO) 2 + O 2 → NiO + 2CO 2 ↑ + H 2 OCo(HCOO) 2 + O 2 → CoO + 2CO 2 ↑ + H 2 OMn(HCOO) 2 + O 2 → MnO + 2CO 2 ↑ + H 2 O…”

High-Tc Quadratic Nonlinear Optical and Dielectric Switchings in Fe-Based Plastic Crystalline Ferroelectric

“…Compared with directional ordered molecules, plastic crystals have more directional disordered molecules, which have weaker intermolecular interactions and stronger isotropy. 11,12 These characteristics and structures with high symmetry enable plastic crystals to have more low-energy dislocation slip surfaces. 13 (iii) A solid−solid transition occurs with a large entropy change.…”

Cover Feature: Spectroscopic Identification of Disordered Molecular Cations in Defect Perovskite‐Like ALn(HCO2)(C2O4)1.5 (Ln=Tb‐Er) Phases (Eur. J. Inorg. Chem. 37/2021)

“…[5][6][7] In recent years hybrid perovskites that combine inorganic and organic building blocks have attracted significant interest, firstly in the AB(HCO2)3 phases, which have been studied for their potential as ferroelectrics and multiferroics, [8][9][10][11] and, dramatically, in the case of the halide hybrid perovskites related to [(CH3)2NH2]PbI3 that are promising next generation photovoltaics. [12][13][14] Hybrid perovskites have shown tremendous chemical flexibility via incorporating a wide variety of molecular A and X site ions; [8,11,[15][16][17][18] the almost complete dominance of monovalent anions, however, has restricted hybrid perovskites to featuring A + and B 2+ cations with the incorporation of B 3+ cations limited to either double perovskite structures with a 50:50 combination of B + and B 3+ cations or cases with a neutral A-site species, whose retention is not required for charge balance. [8,14,[19][20][21] Recently it has been shown that divalent oxalate ligands can be incorporated into hybrid perovskite-like structures.…”