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Unveiling the Impact of Bi Heterovalent Doping on the Negative Capacitance and Ionic Conductivity of Perovskite Single Crystals: Implication in Neuromorphic Computing.
ACS Appl Mater Interfaces
January 2025
Advanced Research in Electrochemical Impedance Spectroscopy Laboratory, Indian Institute of Technology Roorkee, Roorkee 247667, India.
The introduction of heterovalent metal ion doping in the lead (Pb) halide perovskites presents a novel opportunity to manipulate the electronic and ionic properties by introducing dopant charges and increasing the carrier concentration in single crystals. While previous studies have reported on the use of bismuth (Bi) doping in methylammonium lead tribromide (MAPbBr) to adjust the optical properties, the comprehensive impact of Bi doping on the structural and electronic properties of MAPbBr single crystals remains unexplored. This research, therefore, delves into the anomalous behavior of the structural, optical, and electrical properties of pristine and doped MAPbBr single crystals through a combination of experimental and computational studies.
View Article and Find Full Text PDFControlled Heterovalent Vanadium Ion Coordinated Flower-Shaped Supramolecules Cathode for Zinc-Ion Storage.
ACS Appl Mater Interfaces
January 2025
School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China.
Vanadium-based materials, which offer multiple oxidation states and rich redox reactions in zinc-ion batteries (ZIBs), have gained substantial attention. However, achieving green and efficient preparation of vanadium oxides-based materials featured with a controlled content of different heterovalent vanadium remains a significant challenge. Herein, a vanadium-supramolecular flower-shaped material (VSF) with heterovalent vanadium was prepared using NHVO as vanadium metal center and hexamethylenetetramine as organic ligand in aqueous solution.
View Article and Find Full Text PDFExploiting Deep-Ultraviolet Nonlinear Optical Material RbScBOF Originated from Congruously Oriented [BO] Groups.
Angew Chem Int Ed Engl
January 2025
Research Center for Crystal Materials, State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi, 830011, China.
The exploration and research for deep-ultraviolet (UV) nonlinear optical (NLO) crystals are of great significance for all-solid-state lasers. This work is based on the excellent structural [BO] units which manipulate the excellent performances of famous commercial NLO crystal β-BaBO (β-BBO) to explore new alternatives of deep-UV NLO materials. A deep-UV rare-earth metal borate fluoride RbScBOF (RSBF) is successfully designed by combining the heterovalent ions substitution strategy, and fluorination strategy.
View Article and Find Full Text PDFSpinel-Type Structured Phosphor Near-Infrared-II Emission: Intervalence Charge Transfer and Hetero-Valent Chromium Pairs.
Angew Chem Int Ed Engl
November 2024
Department of Chemistry, National Taiwan University, 106, Taipei, Taiwan.
Near-infrared (NIR) emitting phosphors draw much attention because they show great applicability and development prospects in many fields. Herein, a series of inverse spinel-type structured LiGaO phosphors with a high concentration of Cr activators is reported with a dual emission band covering NIR-I and II regions. Except for strong ionic exchange interactions such as Cr-Cr and Cr clusters, an intervalence charge transfer (IVCT) process between aggregated Cr ion pairs is proposed as the mechanism for the ~1210 nm NIR-II emission.
View Article and Find Full Text PDFConstructing Multi-Electron Reactions by Doping Mn to Increase Capacity and Stability in KVMn(PO)/C of Phosphate Cathodes for Potassium-Ion Batteries.
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November 2024
Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao, 066004, China.
Vanadium-based phosphate cathode materials (e.g., KV(PO)) have attracted widespread concentration in cathode materials in potassium-ion batteries owing to their stable structure but suffer from low capacity and poor conductivity.
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