Localized Ligands Assist Ultrafast Multivalent-Cation Intercalation Pseudocapacitance.

Rechargeable batteries based on multivalent cation (Mv , n>1) carriers are considered potentially low-cost alternatives to lithium-ion batteries. However, the high charge-density Mv carriers generally lead to sluggish kinetics and poor structural stability in cathode materials. Herein, we report an Mv storage via intercalation pseudocapacitance mechanism in a 2D bivalve-like organic framework featured with localized ligands.

Ion Co-storage in Porous Organic Frameworks through On-site Coulomb Interactions for High Energy and Power Density Batteries.

Fast and continuous ion insertion is blocked in the common electrodes operating with widely accepted single-ion storage mechanism, primarily due to Coulomb repulsion between the same ions. It results in an irreconcilable conflict between capacity and rate performance. Herein, we designed a porous organic framework with novel multiple-ion co-storage modes, including PF /Li , OTF /Mg , and OTF /Zn co-storage.

Simultaneous Stabilization of Lithium Anode and Cathode using Hyperconjugative Electrolytes for High-voltage Lithium Metal Batteries.

Although great progress has been made in new electrolytes for lithium metal batteries (LMBs), the intrinsic relationship between electrolyte composition and cell performance remains unclear due to the lack of valid quantization method. Here, we proposed the concept of negative center of electrostatic potential (NCESP) and Mayer bond order (MBO) to describe solvent capability, which highly relate to solvation structure and oxidation potential, respectively. Based on established principles, the selected electrolyte with 1.

Formal Nitrene Insertion into the β-Vinyl C-H Bond of Acroleins: Synthesis of Enaminals.

An efficient formal nitrene insertion reaction into the β-vinyl C-H bond of acroleins with an electron-rich organic azide was developed. The reaction protocol can produce secondary enaminals in high yield with a broad substrate scope. In the reaction, acid mediated [3 + 2] cycloaddition of organic azides with an acrolein generated intermediate protonated triazolines, which were selectively decomposed into enaminals with addition of a weakly Brønsted basic reagent such as methanol.

Photocatalytic Abstraction of Hydrogen Atoms from Water Using Hydroxylated Graphitic Carbon Nitride for Hydrogenative Coupling Reactions.

Employing pure water, the ultimate green source of hydrogen donor to initiate chemical reactions that involve a hydrogen atom transfer (HAT) step is fascinating but challenging due to its large H-O bond dissociation energy (BDE =5.1 eV). Many approaches have been explored to stimulate water for hydrogenative reactions, but the efficiency and productivity still require significant enhancement.

Stable Lithium-Carbon Composite Enabled by Dual-Salt Additives.

Lithium metal is regarded as the ultimate negative electrode material for secondary batteries due to its high energy density. However, it suffers from poor cycling stability because of its high reactivity with liquid electrolytes. Therefore, continuous efforts have been put into improving the cycling Coulombic efficiency (CE) to extend the lifespan of the lithium metal negative electrode.