Journal of Solid State Electrochemistry最新文献

FeCo alloys play a crucial role in modern industry due to their excellent soft magnetic properties. However, their inherent poor corrosion resistance limits their application in harsh environments. This study, for the first time, explores the fabrication of phytic acid conversion coatings (PACC) containing various concentrations of Zn²⁺ on the surface of FeCo alloys, aiming to enhance their corrosion resistance. The structure and properties of the coating are systematically characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM), along with electrochemical techniques including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). The wire beam electrode (WBE) technique is innovatively employed to evaluate the dynamic local corrosion protection behavior. The results demonstrate that the formation of PACC significantly improves the corrosion resistance of FeCo alloys. The concentration of Zn²⁺ plays a critical regulatory role in modulating the structural compactness and long-term protective durability of the coating. In particular, the PACC prepared with 3 mM Zn²⁺ (3-PZ) exhibits the most outstanding long-term corrosion resistance and self-enhancing capability, maintaining a protection efficiency of up to 92.03% after 120 h of immersion in 3.5 wt% NaCl solution. The self-enhancing behavior is closely related to the dissolution of metal-phytate complexes and the formation of more stable passivation components during secondary passivation. WBE test results reveal, at the microscale, the effective suppression of local corrosion by PACC on FeCo alloys, with the 3-PZ sample exhibiting no distinct local anodic peaks throughout the entire test period. This study provides new experimental evidence for the development of high-performance and environmentally friendly protective coatings for FeCo alloys.

Lithium-ion batteries (LIBs), characterized by their high energy density and stable cycling life, have been extensively utilized in portable electronic devices such as mobile phones and computers, and they also demonstrate promising applications in electric vehicles and hybrid vehicles. Compared to commercial graphite anode materials, SnO₂ has garnered significant attention due to its high specific capacity, which can better meet the increasing demands for energy storage. However, the substantial volume expansion of SnO₂ during the charge–discharge process negatively affects its cycling stability. TiO₂ nanotube arrays (TNAs) exhibit excellent cycling stability, but their low theoretical specific capacity limits their widespread application as anode materials in lithium-ion batteries. To address these issues, this study prepared various TiO₂/Au/SnO₂ array composite electrodes by altering the loading amount of SnO₂ and systematically investigated their lithium storage performance through electrochemical characterization. The results indicate that TAS-30 can maintain a high specific capacity of 411 mAh·g⁻¹ at a current density of 0.1 A·g⁻¹. Additionally, this paper analyzed the kinetics of Li⁺ during the reaction to determine the optimal loading amount of SnO₂ in the TiO₂/Au/SnO₂ array composite electrodes. Subsequent experiments further demonstrated that capacitive behavior significantly enhanced the lithium storage performance of TAS-30, with 71.4% of the capacity originating from pseudocapacitive control at a scan rate of 10 mV·s⁻¹. This work explores the intrinsic relationship between the loading amount of SnO₂ and the amorphous TiO₂ nanotube arrays, as well as their combined effects on electrochemical performance, providing a reference for the design and application of composite electrodes in lithium-ion batteries.

La-, Sr-, and Co-based oxides have proven their performances in the cathode layers of intermediate temperature levels of solid oxide fuel cells (SOFC), and hence have been frequently studied. They are deposited on the electrolyte layer by chemical vapor deposition (CVD), screen printing, pulsed laser deposition (PLD), etc. The electrospray deposition (ESD) proved itself as an effective and facile method for cathode deposition. Cathode layers deposited on gadolinia-doped ceria (GDC) with the compositions of (La_0.5Sr_0.5)CoO₃, (La_0.8Sr_0.2)CoO₃, (La_0.5Sr_0.5)₂CoO₄, and (La_0.8Sr_0.2)₂CoO₄ are known to provide low resistance values which are critical in cell performance. In this study, ESD is used for the first time as the coating method of these compositions. Area-specific resistance (ASR) measurements made by electrochemical impedance spectroscopy (EIS) showed promising results. Particularly, the sample coated in (La_0.5Sr_0.5)CoO₃ composition showed an ASR value of 0.11 Ω.cm² at 700 °C. ESD showed the ability to control the cathode coating microstructure by controlling the spraying parameters.

Significant enhancements of electrocatalytic activities for both half-reactions of water-splitting, i.e., oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), are demonstrated upon changing the structure of different hexagonal perovskite-type systems. The structural change is observed by gradually incorporating the catalytically active Fe into the B-site in the BaMn_1-xFe_xO_3-δ system. The structure of the BaMn_1-xFe_xO_3-δ system consists of 2H-hexagonal for BaMnO_3-δ, 10H-hexagonal for BaMn_1/2Fe_1/2O_3-δ, and variation of 10H-hexagonal for BaFeO_3-δ. Nevertheless, the change in the structural order by incorporating Fe into the system to fully replace the B-site ion from Mn to Fe results in a significant change in charge transport properties and greater electrocatalytic activity of BaFeO_3-δ, manifested in smaller overpotentials, smaller charge transfer resistance, greater electrocatalytic current density, and faster reaction kinetics. These findings indicate the important role of Fe over Mn in the earth-abundant transition metal catalysts in directing the electrochemical properties.

Graphical abstract

Sodium-sulfur batteries face critical challenges from polysulfide shuttle effects. Herein, we propose a 2D-FeS₂/graphene van der Waals heterostructure as an efficient anchoring material. This configuration preserves the metallic conductivity of graphene (enhancing cathode electron transport) while leveraging FeS₂’s polarity for strong polysulfide adsorption (1.4–3.7 eV). Charge transfer analysis shows that the anchoring ability is further enhanced by increasing the polarity, which helps reduce the high proportion of van der Waals forces in the adsorption energy of the heterostructure. Notably, the heterostructure exhibits low energy barriers for Na₂S decomposition (0.27 eV) and Na⁺ migration (0.16 eV), enabling effective polysulfide conversion kinetics. These synergistic effects collectively suppress shuttle effects and improve cycling stability, demonstrating great potential for high-performance sodium-sulfur batteries.

Graphical Abstract

Supercapacitors are considered some of the best electrochemical energy storage systems due to their high power and energy density, fast charge–discharge capabilities, and longer cycleability, compared to regular capacitors. In this paper, we report the synthesis of hybrid MnO₂/CuS/reduced graphene oxide (MC-rGO) materials via a simple chemical route and characterized them to examine different properties. The focus of this article is to examine the effect of binder concentrations on the electrochemical properties of the supercapacitor electrodes, prepared using the synthesized hybrid materials. We used 5%, 10%, and 15% (wt.%) polyvinylidene fluoride (PVDF) binders to prepare the electrodes. We prepared the slurry of MC-rGO material using synthesized cathode materials, carbon black, and PVDF in 75:10:15, 80:10:10, and 85:10:5 wt.%. The specific capacitance with 5%, 10%, and 15% binders was found to be 176.33 F/g, 161.34 F/g, and 149.55 F/g, respectively, at 0.5 A/g current density.

Designing promising electrode material for supercapacitor application with rich redox activities, high capacity and great cycling stability has become a research priority. Herein, a nanohybrid (CoS_1.097-NiS-MoS₂) with nanosheets combining nanorods morphology is prepared by high-temperature pyrolysis sulfuration of ZIF-67/NiMoO₄. Co-existence of multiple crystalline phases is favorable for enriching electrochemical active sites and facilitating electron transfer. Consequently, CoS_1.097-NiS-MoS₂ displays better supercapacitor performance with a specific capacity of 373.6 C g⁻¹ at current density of 1 A g⁻¹ and excellent cycling stability of 70.01% after 3000 cycles, surpassing CoS_1.097 (49.1 C g⁻¹; 59.26%) and NiS-MoS₂ (105.8 C g⁻¹; 62.00%). Moreover, a hybrid supercapacitor is assembled with CoS_1.097-NiS-MoS₂ and activated carbon, exhibiting high energy density of 21.0 Wh kg⁻¹ at 800 W kg⁻¹. This work opens a path for preparation of promising ternary metal sulfide-based materials for the field of energy storage.

This study presents the development of a highly stable and sensitive glucose biosensor based on glucose oxidase (GOx) immobilized with chitosan (CS) on electrochemically deposited platinum nanoparticles (PtNPs). The biosensor was fabricated by electrodepositing PtNPs onto a glassy carbon electrode (GCE), followed by immobilization of GOx using CS as a biocompatible matrix. Incorporating PtNPs significantly enhanced the electrochemical activity and electron transfer kinetics, resulting in improved sensitivity, while CS improved the biosensor's stability over time. The biosensor demonstrated a wide linear detection range of 1–13 mM glucose, with a detection limit of 0.176 mM. The biosensor exhibited high sensitivity of 23.48 µA mM⁻¹ cm⁻² and demonstrated good reproducibility and long-term stability. These results highlight the roles of CS and PtNPs in enhancing biosensor performance, indicating promising potential for practical glucose monitoring applications in clinical diagnostics.

Graphical abstract

Screen-printed electrodes (SPE) and laser-induced graphene (LIG) platforms based on carbon materials have gained increasing attention for their scalability, affordability, and analytical versatility. While numerous studies report promising results, few provide a detailed correlation between material properties and electrochemical performance. This review critically examines recent research (2020–2025) involving SPE and LIG electrodes composed exclusively of carbon-based materials, including those modified with carbon nanostructures, highlighting how fabrication variables, ink formulations, and substrate types influence analytical outcomes. Particular emphasis is placed on the role of characterization techniques such as SEM (scanning electron microscopy), Raman spectroscopy, AFM (atomic force microscopy), TEM (transmission electron microscopy), FTIR (Fourier transform infrared spectroscopy), EIS (electrochemical impedance spectroscopy), and XPS (X-ray photoelectron spectroscopy) in understanding structure–function relationships. By synthesizing trends across studies and comparing sensor metrics such as limit of detection (LOD), sensitivity, and stability, this work highlights persistent gaps in the literature and points to key aspects that require further investigation.