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Cation‐Deficiency‐Dependent CO2 Electroreduction over Copper‐Based Ruddlesden‐Popper Perovskite Oxides

Here we report an effective strategy to enhance CO2 electroreduction (CER) properties of Cu-based Ruddlesden-Popper (RP) perovskite oxides by engineering their A-site cation deficiencies. With La2-xCuO4-δ (L2-xC, x = 0, 0.1, 0.2, and 0.3) as proof-of-concept catalysts, we demonstrate that their CER activity and selectivity (to C2+ or CH4) show either...

Tailoring Co3d and O2p band centers to inhibit oxygen escape for stable 4.6V LiCoO2 cathodes

High voltage LiCoO 2 delivers a high capacity but sharp fading is a critical issue, and the capacity decay mechanism is also poorly understood. Herein, we clarify that the escape of surface oxygen and Li-insulator Co 3 O 4 formation are the main causes for the capacity fading of 4.6V LiCoO 2 . We further propose the inhibition of the oxygen...

Strategy for Site‐ and Chemoselective C–H Alkenylation through Osmaelectrooxidative Catalysis

Herein, we disclose osmaelectro-catalyzed C–H activations that set the stage for electrooxidative alkyne annulations by benzoic acids. The osmium electrocatalysis enables site- and chemoselective electrooxidative C–H activations with unique levels of selectivities. The isolation of unprecedented osmium(0) and osmium(II) intermediates, along with crystallographic...

Divergent Synthesis of Skeletally Distinct Arboridinine and Arborisidine

A divergent synthesis of skeletally distinct arboridinine and arborisidine was achieved. The central divergent strategy was inspired by the divergent biosynthetic cyclization mode of arboridinine and arborisidine and their hidden topological connection. The branch point was synthesized through a Michael and Mannich cascade process. A site-selective...

Heterocycle/Heteroallene Ring‐Opening Copolymerization: Selective Catalysis Delivering Alternating Copolymers

Ring-opening copolymerisation (ROCOP) is a powerful living polymerisation that yields numerous alternating copolymers with precisely placed heteroatoms in the polymer backbones. This Review summarizes the state-of-the-art of this important method, describes the principles of the catalysis, and illustrates the potential of the different monomer combinations...

The Anionic Pathway in the Nickel‐Catalysed Cross‐Coupling of Aryl Ethers

Assessment of the rich co-complexation chemistry of Ni(COD)2 and PhLi has led to a new family of structurally diverse lithium nickelates being uncovered. Combined stoichiometric, catalytic, and kinetic studies reveal that these hetero-bimetallic complexes may be the key intermediates that facilitate the smooth C−O bond cleavage and cross-coupling of...

Light‐Modulated Cationic and Anionic Transport across Protein Biopolymers**

Covalently attaching photoacids and photobases to the surface of a polymer makes it possible to change the concentration of positive protons and negative hydroxides within the polymer upon irradiation with light. Such a change in charge carriers results in a light-modulated increase in the ionic conductivity across the polymer. Abstract Light...

Rational Selection of Cyanines to Generate Conjugate Acid and Free Radicals for Photopolymerization upon Exposure at 860 nm

Substitution of cyanines with different terminal indolium groups and distinct polymethine chain directs the excited state either to deactivation by internal conversion (IC) or photochemistry resulting in the generation of initiating radicals for free-radical polymerization and conjugate acid for cationic polymerization an self-polyaddition of vinyl...

Atomic Cation‐Vacancy Engineering of NiFe‐Layered Double Hydroxides for Improved Activity and Stability towards the Oxygen Evolution Reaction

Metal dissolution induced by lattice distortions was found to be responsible for the activity degradation of NiFe-LDH catalysts during alkaline OER. This degradation could be suppressed by introducing atomic cation vacancies in the LDH basal plane. Cation vacancy engineering strengthened the binding energy between metal cations and oxygen in the LDH...

In situ modulation of A‐site vacancies in LaMnO3.15 perovskite for surface lattice oxygen activation and boosted redox reactions

Modulation of A-site defects is crucial to the redox reactions on ABO3 perovskites for both clean air application and electrochemical energy storage. Herein we report a scalable one-pot strategy for in situ regulation of La vacancies (V La) in LaMnO3.15 by simply introducing urea in the traditional citrate process, and further reveal the fundamental...

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