Journal of Solid State Electrochemistry最新文献

Sodium-ion batteries are gaining broad application prospects in the field of new energy due to their high energy density, low cost, and good safety. However, the irreversible phase transformation of layered oxides during charge and discharge cycles limits their long-term cycling performance and practicality. This article utilizes the sol–gel method to prepare a stable Na_0.7MnO₂ (NMO) crystal phase and explores the effects of double doping with Fe and Co on the microstructure and electrochemical properties of Na_0.7MnO₂. The XRD pattern indicates that Fe and Co ions were successfully incorporated into the lattice of the Na-Mn–O system, stabilizing the P2 crystal phase and increasing the sodium layer spacing. Na_0.7Co_0.1Fe_0.1Mn_0.8O₂(NCFMO) can deliver an initial capacity of 109.78 mAh/g, with an average operating voltage of 3 V, and retains a capacity retention rate of 96.31% after 100 cycles. Moreover, at a current density of 0.2 C and a voltage range of 1.5–4.5 V, the cycle charge–discharge specific capacity reaches 226.08 and 159.3 mAh/g, respectively, demonstrating excellent cycle and rate performance.

Graphical abstract

The cycle performance of the material Na_0.7Co_0.1Fe_0.1Mn_0.8O₂ in different voltage ranges is tested in the figure, and it shows excellent performance in the voltage range of 1.5–4.5 V.

In this work, pulsed electrodeposition was utilized to successfully create Ni–B/ZrPP composite coatings on N80 steel plates. Investigations were conducted into how zirconium phenylphosphonate (ZrPP) nanosheets affected the mechanical characteristics, corrosion resistance, and surface morphology of Ni–B metal coatings. The results show that the surface of Ni–B/ZrPP nanocomposite coating is dense, and the defects of the original Ni–B coating are improved by ZrPP. In particular, with a flatter wear trajectory and a smaller wear volume, the composite coating containing 1.0 g/L of ZrPP had the maximum microhardness (1043 Hv) and an average COF of 0.350. At this point in time, the composite coating had the biggest total impedance (64,500 Ω⋅cm²), the lowest corrosion rate (0.0256 mm/year), the highest corrosion potential (− 0.332 V), the lowest corrosion current density (2.18 µA/cm²), and the best corrosion resistance.

TiO₂ nanotubes have been numerously utilized in photoelectrochemical field due to its intrinsic and structural advantages. However, TiO₂ nanotubes anodized in organic electrolyte endemically involve carbon-rich layers inside of nanotubes, frequently interrupting charge transfers and photocatalytic reactions. In this study, we investigated some different treatments of TiO₂ nanotubes to eliminate carbon-rich layers from anodic TiO₂ nanotubes. Firstly, photoelectrochemical properties of TiO₂ with various thickness were addressed, and the TiO₂ nanotubes with 3.65 µm were selected for the further treatments. Subsequently, the morphological properties of TiO₂ were optimized to be utilized as a photoanode through the different treatment methods. In conclusion, the optimal TiO₂ nanotubes treated by mechanical grinding and chemical etching process behaved as an efficient photoanode with enhanced photocurrent of 0.2 mA/cm², IPCE of 59% at 350 nm and lowered charge transfer resistance of 983 Ω.

Carbon-based materials have been widely used in anodes for sodium metal batteries (SMBs). Surface modification of carbon-based materials is an effective method to improve the de-embedding behavior of sodium metal, which can increase the battery life, whereas SMBs need simpler and more efficient modification methods for practical-grade application. In this paper, novel disintegrated carbon nanofibers (D-CNFs) with rough surfaces were obtained by plasma treatment. D-CNFs exhibited highly reversible sodium deposition characteristics and were able to operate at a low polarization potential of 0.023 V for 800 h. The coulombic efficiency of the D-CNFs was stabilized above 97% after the third cycle. This excellent electrochemical performance is attributed to the disintegration of CNFs as a result of the plasma treatment. The CNFs expose richer vacancies, providing more active sites for sodium metal deposition. This implies that the prepared D-CNFs have better sodium storage properties. Meanwhile, this surface modification facilitates the further application of carbon-based materials in SMBs.

In this study, we successfully synthesized semiconductor thin films of Cu₂FeSnS₄ (CFTS) using the electrodeposition method. We delved into the mechanisms of electrochemical nucleation and growth, shedding light on these processes. Utilizing potentiostatic current-density-time transient measurements and in situ electrochemical impedance spectroscopy (EIS), we explored the nucleation and growth mechanisms of Cu₂FeSnS₄ (CFTS) thin films, deposited from an aqueous solution under various applied potentials. Cyclic voltammetry was employed to investigate the electrochemical behaviors of Cu-Fe-Sn-S precursors in a trisodium citrate medium. Chronoamperometry and EIS analysis were conducted to delve deeply into the deposition mechanism and surface electrode-electrolyte phenomena. Furthermore, the study explored the impact of Fe²⁺ concentration on structural morphology and optical properties. X-ray diffraction and Raman analysis unveiled the stannite structure within the obtained Cu₂FeSnS₄ thin film, alongside the presence of secondary phases in the CFTS elaborated at both lower and higher concentrations of Fe²⁺. SEM images reveal that the sulfurized CFTS C2 (0.01 M of Fe²⁺) sample has a surface morphology with irregular particles. EDS mapping and EDX analysis confirm that the elemental concentrations of Cu, Fe, Sn, and S in the CFTS C2 thin films closely match the desired stoichiometry for Cu₂FeSnS₄. UV-visible spectroscopy revealed a suitable bandgap energy within the range of 1.5 eV for the film deposited with a Fe²⁺ concentration of 0.01 M.

Graphical Abstract

2,4,5-Trihydroxybenzoic acid (THBA) is a synthetic antioxidant used in the food industry that has attracted attention due to the potential risks it may pose to human health; thus, ensuring compliance with legal standards is essential. In this regard, the present study describes the development of an electrochemical platform based on a carbon-printed electrode (SPE) modified with titanium (Ti)-based nanowires (NWs) for THBA detection. However, the synthesis of Ti-based NWs involved varying copper (Cu) quantities, resulting in few morphological changes compared to the unmodified counterpart. Interestingly, the syntheses were carried out without organic stabilizers, resulting in the preparation of cleaner nanostructures; such an approach was planned to enhance the electrochemical sensing performance, reduce costs, and promote environmental friendliness. Moreover, it improves charge transfer efficiency, making the synthesis process ideal for sustainable nanomaterial production. XRD analyses indicate that the addition of the metal affected the structure of the Ti-based NWs. Also, SEM images revealed that the unmodified SPE exhibited a smooth surface, whereas the Cu-modified Ti-based NWs/SPE showed a dense network of such material. In addition, the electrochemical studies have shown an enhancing of the electrocatalytic properties after the introduction of copper. Under optimized conditions, it was found that THBA can be determined over a wide working range from 500 pmol L⁻¹ to 5000 µmol L⁻¹. The applicability of the sensor was verified by detecting THBA in soybean oil and sunflower oil samples, showing excellent recovery values between 96.30 and 101.87%, suggesting that the proposed sensor demonstrates good accuracy and can be successfully applied to edible oil samples.

The designing cathode materials of aqueous zinc-ion batteries (AZIBs) with high performance is significant challenges in the development of AZIBs. Metal–organic frameworks (MOFs) are considered prime candidates for cathode modification and high-performance cathode materials. Herein, a two-step hydrothermal method was employed to fabricate a bimetallic metal–organic framework MnCo-MOF on carbon cloth. The resulting precursor was calcined to produce a cathode composite MnCo₂O₄. As a cathode for AZIBs, MnCo₂O₄/CC exhibited an average specific capacity of 280.6 mAh/g. Upon completion of the cycle at a current density of 0.2 A/g, the specific capacity measured 275.1 mAh/g (retaining 98% of its initial capacity), while maintaining a coulombic efficiency of approximately 98.5%. The excellent cycling performance, superior specific capacity, and superb coulombic efficiency are ascribed to the concerted influence of the polymetallic ions. The micro and nano scale interconnected block structure of MnCo₂O₄ facilitates interaction between electrode substance and the electrolyte. This research broadens the selection of cathode material and offers valuable guidance for designing high-performance cathode materials for AZIBs.