Journal of Solid State Electrochemistry最新文献

Graphene oxide (GO) has emerged as a pivotal material for high rate sodium ions storage attributed to the tunable interlayer spacing, high specific surface area, and excellent electrical conductivity. However, the restacking and narrow interlayer spacing of GO layers restrict their cycle life and rate capability. In this study, organic 3,3′-diaminobenzidine (DABZ) molecules are embedded into the interlayers of GO via a molecular welding technique. The DABZ molecules are strongly anchored between GO layers via stable amide (HN-C = O) bonds which formed through the dehydration condensation reaction between -COOH groups on GO and -NH₂ groups of DABZ molecules. It can not only contribute a pillar effect that enlarging the interlayer spacing, but also introduces a traction effect that enhancing the structural stability of GO. Consequently, the interlayer spacing of GO is expanded to 0.88 nm compared with that of 0.71 nm for GO, thereby optimizing the layered structure and enhanced sodium-ion storage rate capability. The DABZ-GO demonstrated an exceptional reversible capacity of 245.1 mAh g⁻¹ after 1200 cycles at a current density of 0.5 A g⁻¹ and the DABZ-GO||AC sodium ion capacitors (SICs) also achieved an energy density of 45.1 Wh kg⁻¹ and a power density of 9494.7 W kg⁻¹, with a capacity retention rate of 60.1% after 5000 cycles. The proposed molecular welding-chemical bond anchoring strategy provides an innovative and efficient approach for modulating interlayer spacing and design stable and high rate sodium ions storage materials.

In this work, imidazole (IMZ) is evaluated as a corrosion inhibitor for archaeological steel associated with wood in 10% PEG-200 solution. Inhibitory properties were characterized by electrochemical measurements and morphological analysis, while fungicidal power was monitored by natural aging. The results showed that IMZ is a mixed-type inhibitor with an efficacy of 99.5%, which improves with time, of which 32 °C proved to be the optimum temperature. In impregnation, IMZ preserved the original appearance of the nail while minimizing wood mineralization, although its biocidal power remained insufficient.

Research into solid electrolytes with high stability and ionic conductivity is essential for developing safe, high energy density Li-ion batteries, with garnet type (Li₇La₃Zr₂O₁₂, LLZO) solid-state electrolyte being a promising candidate. However, its low room-temperature conductivity, high activation energy, and the requirement for high-temperature synthesis to achieve cubic LLZO limit its application. This study uses an optimized solid phase reaction method to prepare Nb-doped LLZO solid-state electrolyte by incorporating a variable ball milling duration, refined sintering conditions, and an optimized Nb doping concentration to systematically investigate its impact on microstructure and electrochemical performance analyzed using Raman analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The results revealed that the optimum concentration of the Nb doping sintered at 1200 ℃ for 2 h achieved a high-performance Nb-doped LLZO solid state electrolyte as compared to undoped LLZO solid state electrolyte.

The influence of CoMoO₄/Co₃O₄ heterojunction and the interlayer synergistic effect on the morphology and electrochemical performance of composite electrode materials for supercapacitors was explored in this paper. Co₃O₄, CoMoO₄, and CoMoO₄/Co₃O₄ were synthesized on the surface of nickel foam (NF) via a solvothermal synthesis combined with heat treatment. Subsequently, CoMo-LDH was uniformly coated through a secondary solvothermal process. The results indicate that during the material construction process, the growth of CoMoO₄/Co₃O₄ has a pivotal function in promoting its development. It facilitates the formation of a three-dimensional hierarchical nanoflower structure, which results in an increased specific surface area, creating numerous active sites, thereby significantly enhancing electrochemical performance. CoMo-LDH@CoMoO₄/Co₃O₄ exhibited excellent performance due to the synergistic effect of consistent raw material ratios and the superior three-dimensional hierarchical nanoflower structure. Density functional theory calculations confirm the metallic nature of the heterojunction, which synergizes with the nanoflower morphology to facilitate charge transfer. In a three-electrode system, the specific capacitance was found to be 2170.8 mF cm⁻² at 1 mA cm⁻², with inherent impedance and transfer impedance of 0.827 Ω and 0.234 Ω, respectively. Meanwhile, an asymmetric supercapacitor was developed with the prepared CoMo-LDH@CoMoO₄/Co₃O₄ and activated carbon. At a power density of 800.4 µW cm⁻², the energy density was 93.3 µWh cm⁻². After 9000 cycles, its capacitance retention was 85.6%, with Coulombic efficiency stable at 100%.

An electrochemical sensor based on Cu₃(BTC)₂ MOF-fabricated screen-printed carbon electrode (SPCE) was employed for Cd(II) detection. The Cu₃(BTC)₂ was synthesized via a straightforward solvothermal approach and characterized by XRD, FT-IR, TGA, and FE-SEM. The XRD of the synthesized Cu₃(BTC)₂ was in good agreement with the existing Cu₃(BTC)₂ (CCDC 112954). The FT-IR results revealed the absorption bands at 1368–1446 cm⁻¹ and 1554–1640 cm⁻¹ which may be ascribed to the bridged bidentate coordination of carboxylate groups in Cu₃(BTC)₂ MOF. The Cu₃(BTC)₂-modified electrode offers the facile electron transfer and greater electrochemical surface area compared to the bare electrode. The recovery of Cd(II) ranged from 102.68 to 115.36%, which proves the practical applicability of the Cu₃(BTC)₂/SPCE electrode.

Rapid exhaustion of non-renewable fuels due to industrialization has molded research to find a feasible approach by recycling wastewater. Incidentally, microbial fuel cells (MFCs) have appeared as a sustainable tool to treat wastewater and convert bioelectricity simultaneously. The limitations—microbial poisoning, electrode decay, and the potential drop in MFCs—make it unsuitable for high-energy applications. The fabrication of a polymer-metal organic framework (P-MOF)-supported electrode offers high conductivity, improved surface area, and substantial pore volume, resulting in significant MFC power output. The incorporation of MOF with polymer has improved the performance of the electrode owing to its remarkable electrochemical properties. This review highlights the essential insights into the sustainable development goals, emphasizing the physicochemical parameters and biocompatibility of polymer-MOF-modified electrodes. Moreover, the recent advances and the challenges of electrodes to be used in MFCs are discussed. Based on the assessment of power density, the hybrid electrodes could be a remarkable alternative in MFCs.

Heterojunction as negative electrode of sodium ion battery has become a research hotspot. It can not only solve the problem of single-layer negative electrode but also improve the stability by synergy. It has the advantages of high capacity, good magnification, and long cycle. This article is based on first principles and constructs a SiC/Nb₂CO₂ heterojunction composite material using ceramic material 3C-SiC and MXene material Nb₂C. The potential performance of SiC/Nb₂CO₂ heterojunction as a negative electrode material for sodium ion batteries is explored in depth. When constructing heterojunction materials of Nb₂C and 3C-SiC functionalized with O, it was found that the electrochemical performance is excellent, with abundant structural adsorption sites and a significant advantage in theoretical capacity of 588.81 mAh/g. The open circuit voltage at the maximum adsorption concentration is in the ideal range of 0–1 V, which can suppress sodium dendrites and improve battery safety and stability. This study reveals the influence of 3C-SiC and Nb₂CO₂ composite materials on Na ion storage performance, providing a new path and theoretical support for optimizing negative electrode materials for sodium ion batteries, as well as ideas for related research fields, and promoting innovation in the development of sodium ion battery materials.

This study investigated the preparation of pure gold nanoparticles (AuNPs) using laser ablation, highlighting how modification of acidic and alkaline pH improve nanoparticle stability and electrochemical sensing efficacy. The sensing performance of an extended-gate field-effect transistor (EGFET) pH sensor utilizing AuNPs was investigated in different buffer solutions within a pH range of 3 to 11, illustrating the impact of acidity and basicity on transfer characteristics. Adjusting the pH conditions resulted in AuNPs exhibiting enhanced structural stability and uniform shape. Thorough characterization, including ultraviolet–visible (UV–Vis) and Fourier transform infrared (FTIR) spectroscopy investigations, revealed that pH substantially influences surface chemistry and colloidal stability. Additionally, transmission electron microscopy (TEM), field-emission scanning electron microscopy (FESEM), and energy-dispersive X-ray (EDX) investigations conducted at pH = 7 elucidated the shape and elemental content of the nanoparticles. UV–Vis spectroscopy was utilized to examine the optical characteristics and stability of the AuNPs synthesized at different pH levels, demonstrating the impact of pH variations on their bioreduction and stability. Stability evaluations, denoted by coefficient of variation (CV) metrics, demonstrated enhanced performance, with CV values of 6.6%, 7.02%, and 3.8% for pH 4, pH 7, and pH 10, respectively. The findings highlight the considerable influence of pH on the properties of gold nanoparticles and reinforce the importance of pH-controlled synthesis for the production of stable, high-performance AuNP-based sensors. Storing gold nanoparticles at a mildly acidic pH of approximately 6 ensures stability and reduces aggregation, thereby maintaining their optical and functional properties for future applications and offering insights into optimizing EGFET sensor designs for improved sensitivity and stability.

The proton ceramic fuel cell (PCFC) is a cutting-edge technology for achieving carbon-free and efficient energy conversion. It has garnered significant attention in the clean energy sector due to its environmental adaptability and fuel compatibility in the low to medium temperature range of 500 to 700 °C. The intrinsic properties of cathode materials significantly affect the electrochemical performance of PCFC. In this study, a novel Sc-doped La_0.6Sr_0.4CoO_3−δ cathode was designed and synthesized using the sol–gel method, and its electrochemical performance in the PCFC was systematically investigated. Test results under hydrogen fuel conditions demonstrated that the single cell using the La_0.6Sr_0.4Sc_0.4Co_0.6O_3−δ cathode exhibited a respectable power output capability at 700 °C, achieving a peak power density (PPD) of 556 mW cm⁻² and polarization impedance of 0.217 Ω cm². Notably, the cell exhibited a performance degradation rate as low as 0.013% h⁻¹ after 100 h of operation at a constant current discharge of 342 mA cm⁻², with the open-circuit voltage and PPD maintaining 98.5% and 107% of their initial values, respectively. This study provides valuable reference for the design of perovskite cathodes for PCFC.