Journal of Solid State Electrochemistry最新文献

The exploration of advanced anode materials for lithium-ion batteries (LIBs) has prompted the investigation of NiO/MXene composites, which merge the high theoretical capacity of NiO with the excellent conductivity and structural stability of MXene. This research emphasizes the synthesis, characterization, and electrochemical assessment of NiO/MXene composites as high performance anode materials. Co-precipitation technique is employed to fabricate NiO/MXene material, resulting in a distinct layered structure that alleviates common issues such as volume expansion and particle disintegration during charge–discharge cycles. Structural analyses such as X-ray diffraction and X-ray photoelectron spectroscopy measurements confirms the formation of NiO/MXenes. Morphological examination reveals the even distribution of NiO on MXene surfaces and interlayers. Electrochemical characterization exposed its cycling stability, capacity retention, rate capability and effective capacitive and diffusion contribution. The synergistic interaction between NiO and MXene facilitates lithium-ion diffusion and enhances electronic conductivity. The composite showed a first charge/discharge capacity of 649.47/617.8 mAh g⁻¹ at 0.1C rate, exhibiting significant capacitive and diffusive contribution that supports dual mechanisms of charge storage.

This paper focuses on the investigation of tin disulfide (SnS₂) as a promising anode material for sodium-ion batteries (SIBs), which have emerged as a viable alternative to lithium-ion batteries due to the abundance and low cost of sodium. Sodium is widely available, comprising approximately 2.6% of the Earth’s crust, and is also present in large quantities in seawater in the form of sodium chloride, making it a readily accessible and economical resource. As such, sodium-ion batteries are considered a cost-effective energy storage solution that can help mitigate the limitations associated with lithium resource scarcity. Their environmental friendliness and inherent safety—particularly in aqueous systems where electrolytes exhibit high safety—further contribute to their growing appeal. In recent years, both research and industrial development of sodium-ion batteries have accelerated, with technological advancements leading to increasing maturity and broader application prospects. SIBs have demonstrated unique advantages in large-scale energy storage, low-speed electric vehicles, and backup power systems for data centers. This paper provides a comprehensive review of various fabrication methods for SnS₂-based anodes, aiming to offer valuable insights and direction for future research. It concludes with a summary of promising research avenues, serving as a reference for the continued development and optimization of SnS₂ anodes in sodium-ion battery technologies.

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.

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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