Enhancing the Interfacial Ionic Transport via in Situ 3D Composite Polymer Electrolytes for Solid-State Lithium Batteries
ACS APPLIED ENERGY MATERIALS
Authors: Chen, Weimin; Xiong, Xiaoqin; Zeng, Rui; Jiang, Long; Chen, Zhigao; Xiao, Zhuangwei; Qie, Long; Yu, Faquan; Huang, Yunhui
Abstract
Solid-state electrolytes with high ionic conductivity, excellent interfacial stability, and fast interfacial charge transport are desired for next-generation high-energy-density lithium-metal batteries. Herein, an in situ three-dimensional (3D) composite polymer electrolyte (CPE) is designed and fabricated by a simple solidification of poly(ethylene oxide) (PEO) solution precursor with a 3D TiO2 backbone on the cathode. The 3D CPE not only shows a very stable structure and high ionic conductivity but also exhibits impressive capability to suppress the Li dendrite growth. Moreover, the in situ built 3D CPE guarantees a tight and stable contact at the cathode/electrolyte interface, leading to an reduced interfacial resistance and polarization. Thus, in the solid-state Li parallel to 3D CPE parallel to LiFePO4 batteries, the diffusion coefficient of Li+ ions has been increased by nearly 1 order of magnitude. The specific capacity (159 mAh g(-1) at 20 mA g(-1)), rate capability, and cycling stability (85.1% capacity retention after 100 cycles) have also been significantly improved. This study provides an efficient strategy to reduce the interfacial resistance and improve the Li+ transport in solid-state batteries.
A Cerium Hexacyanoferrate (III) Nanoparticle-modified Carbon Paste Electrode: Voltammetric Characterization and Behavior in the Presence of Dopamine
ELECTROANALYSIS
Authors: de Oliveira, Denys Ribeiro; Fernandes, Daniela Silvestrini; do Carmo, Devaney Ribeiro
Abstract
This study describes a fast and simple methodology for the preparation of Cerium (III) Hexacyanoferrate (II) (CeHCF) nanoparticles (NPs). The NPs were characterized by fourier transform infrared (FTIR), x-ray diffraction (XRD), scanning electron microscopy (SEM) and cyclic voltammetry (CV). The CeHCF cyclic voltammogram indicate a well-defined redox pair assigned as Fe2+/Fe3+ in the presence of cerium (III), with a formal potential of E-theta '=0.29 V (v=100 mV s(-1), KNO3; 1.0 mol/L, pH 7.0). The carbon paste electrode modified with CeHCF (CeHCF-CPE) was applied to the catalytic electrooxidation of dopamine applying Differential Pulse Voltammetry (DPV). DPV showed linear response at two concentration ranges, from 9.0x10(-7) to 8.0x10(-6) and 9.0x10(-6) to 1.0x10(-4) mol/L, with an LOD of 1.9x10(-7) and 1.0x10(-5) mol/L, respectively. The CeHCF-CPE exhibited selectivity against substances commonly found in biological samples, with redox potentials close to that of dopamine, such as urea and ascorbic acid (AA). Subsequently the CeHCF-CPE was successfully applied to the detection of dopamine in simulated urine samples, with recovery percentages ranging between 99 and 103%.