CsAc and HPbX 3 were adopted in CsPbX 3 perovskite preparation, which led to high-quality CsPbX 3 perovskite films with large film thickness (>500 nm). Taking advantage of this new precursor system, efficient CsPbIBr 2 inorganic perovskite solar cells with record power conversion efficiency (PCE) of 8.54% were achieved. By introducing a judicious amount of PEAI into the new precursor pair, inorganic quasi-2D perovskites emerged and delivered a reproducible PCE of 12.4% for a-CsPbI 3 with greatly improved stability.

The hydrophobic internal cavity and hydrophilic external surface of cyclodextrins (CDs) render promising electrochemical applications. Here, we report a comparative and mechanistic study on the use of CD molecules (α-, β-, and γ-CD) as electrolyte additives for rechargeable Zn batteries. The addition of α-CD in aqueous ZnSO 4 solution reduces nucleation overpotential and activation energy of Zn plating and suppresses H 2 generation. Computational, spectroscopic, and electrochemical studies reveal that α-CD preferentially adsorbs in parallel on the Zn surface via secondary hydroxyl groups, suppressing water-induced side reactions of hydrogen evolution and hydroxide sulfate formation. Additionally, the hydrophilic exterior surface of α-CD with intense electron density simultaneously facilitates Zn 2+ deposition and alleviates Zn dendrite formation. A formulated 3 M ZnSO 4 + 10 mM α-CD electrolyte enables homogenous Zn plating/stripping (average Coulombic efficiency ∼ 99.90%) at 1 mA cm −2 in Zn|Cu cells and a considerable capacity retention of 84.20% after 800 cycles in Zn|V 2 O 5 full batteries. This study provides insight into the use of supramolecular macrocycles to modulate and enhance the interface stability and kinetics of metallic anodes for aqueous battery chemistry.

Organic electrode materials suffer from low electronic conductivity and poor structure stability.H erein, ametal-organic polymer,Ni-coordinated tetramino-benzoquinone (Ni-TABQ), is synthesized via d-p hybridization. The polymer chains are stitched by hydrogen bonds to feature as arobust two-dimensional (2D) layered structure.Itoffers both electron conduction and Na + diffusion pathwaysa long the directions of the polymer chains and the hydrogen bonds.With both the conjugated benzoidcarbonyls and imines as the redox centers for the insertion and extraction of Na + ,t he Ni-TABQ delivers high capacities of about 469.5 mAh g À1 at 100 mA g À1 and 345.4 mAh g À1 at 8Ag À1 .The large capacities are sustained for 100 cycles with almost 100 %c oulombic efficiencies.T he exceptional electrochemical performance is attributed to the unique 2D electron conduction and Na + diffusion pathways enabled by the robust Ni-N and hydrogen bonds.

Rechargeable aqueous Zn metal batteries have become promising candidates for large-scale electrochemical energy storage owing to their high safety and affordable low cost. However, Zn metal anode suffers from dendritic growth and hydrogen evolution reaction (HER), deteriorating the electrochemical performance. Here, we demonstrate that these challenges can be conquered by introducing a halogen ion into the Zn2+ solvation structure. By designing an electrolyte composed of zinc acetate and ammonium halide, the electron-donating anion I– can coordinate with Zn2+ and transform the traditional Zn­(H2O)6 2+ to ZnI­(H2O)5 +, in which I– could transfer electrons into H2O and thus suppress HER. The dynamic electrostatic shielding layer formed by concomitant NH4 + can restrict the dendritic growth. As a result, the halogenated electrolyte achieves a high initial coulombic efficiency (CE) of 99.3% in the Zn plating/stripping process and remains at an average of ∼99.8% with uniform Zn deposition. Moreover, Zn–I batteries are constructed by using dissociative I– as the cathode and carbon felt–polyaniline as the conductive and adsorptive layer, exhibiting an average CE of 98.6% without capacity decay after 300 cycles. This work provides insights into the halogenated Zn2+ solvation structure and offers a general electrolyte design strategy for achieving a highly reversible Zn metal anode and batteries.