Journal of Electroanalytical Chemistry最新文献

英文中文

Hierarchical porous MXene film with diffusion path optimization for supercapacitor 用于超级电容器的具有扩散路径优化功能的分层多孔 MXene 薄膜

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-24 DOI: 10.1016/j.jelechem.2024.118733

Xuefeng Zhang , Haiqin Lin , Huaqing Peng , Wenrui Li , Ting Wang , Jianpeng Li , Qiancheng Xiong , Yong Liu , Xudong Liu

MXenes have immense potential in electrochemical energy storage owing to their outstanding physicochemical properties such as their oxygen-containing groups that impart additional pseudocapacitance to acidic electrolytes. However, during electrode assembly, MXene nanosheets undergo restacking because of hydrogen bonding and van der Waals forces, which causes electrolyte ions to traverse long diffusion pathways between the long and narrow nanosheets. Exploiting the oxidative properties of Ti₃C₂T_x, a hierarchical porous MXene film with micro-, meso- and macroporous structures was successfully prepared using a simple hydrothermal oxidation and etching process to create micro- and mesoporous structures, followed by ice templating to prepare three-dimensional (3D) linked macroporous structures. Because these hierarchical pores have synergistic effects on electrochemical activity and electrolyte ion diffusion, the film attained a specific capacitance of 539F/g at a current density of 2 A/g when it was used as a supercapacitor electrode, which corresponds to one of the highest values reported for MXene-based electrodes. The film retained 83% of its specific capacitance when the current density was increased to 40 A/g, and exhibited excellent cycling stability. By using this multi-porous MXene design, synergistic improvement in ion diffusion was successfully realized and thus a new strategy to prepare high-performance supercapacitor electrode materials was developed.

二氧化二烯具有出色的物理化学特性，例如其含氧基团可为酸性电解质带来额外的假电容，因此在电化学储能方面具有巨大潜力。然而，在电极组装过程中，由于氢键和范德华力的作用，MXene 纳米片会发生重新堆积，从而导致电解质离子在狭长的纳米片之间穿过长长的扩散通道。利用 Ti3C2Tx 的氧化特性，成功制备了具有微孔、中孔和大孔结构的分层多孔 MXene 薄膜，采用简单的水热氧化和蚀刻工艺生成微孔和中孔结构，然后通过冰模板制备三维（3D）连通大孔结构。由于这些分层孔隙对电化学活性和电解质离子扩散具有协同作用，当薄膜用作超级电容器电极时，在电流密度为 2 A/g 时，其比电容达到了 539F/g，这是所报道的基于 MXene 的电极的最高值之一。当电流密度增加到 40 A/g 时，薄膜仍能保持 83% 的比电容，并表现出卓越的循环稳定性。通过使用这种多孔 MXene 设计，成功实现了离子扩散的协同改善，从而开发出一种制备高性能超级电容器电极材料的新策略。

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引用次数: 0

Synergistic enhancement of lithium iron phosphate electrochemical performance by organic zinc source doping and crystalline carbon layer capping 通过有机锌源掺杂和晶体碳层封盖协同提高磷酸铁锂的电化学性能

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jelechem.2024.118716

Chengyu Pan, Bowen Li, Weicheng Xie, Haoyan Yin, Yanmin Gao

In this study, lithium iron phosphate (LFP) is prepared as cathode material by hydrothermal synthesis method and the combined effect of doping and capping is applied to co-modify it. We thoroughly investigate how Zn²⁺ doping and PA capping layer affect the crystal structure, microscopic morphology, and electrochemical properties of LFP cathode materials. The experimental results show that when co-modified with 5 % Zn²⁺ doping combined with 7 % PA capping layer, the resulting cathode material exhibits a discharge specific capacity of 165.5 mAh g⁻¹, and the capacity retention rate can still be maintained at a high level of 98.6 % after 200 charge–discharge cycles.

本研究采用水热合成法制备了磷酸铁锂（LFP）正极材料，并应用掺杂和封盖的联合效应对其进行了共修饰。我们深入研究了 Zn2+ 掺杂和 PA 封盖层如何影响磷酸铁锂正极材料的晶体结构、微观形貌和电化学性能。实验结果表明，当掺杂 5% 的 Zn2+ 并结合 7% 的 PA 盖层进行共修饰时，所得到的阴极材料的放电比容量为 165.5 mAh g-1，并且在 200 次充放电循环后，容量保持率仍能保持在 98.6% 的高水平。

引用次数: 0

Reduced lattice spacing of birnessite type manganese dioxide/ expanded graphite cathode for stable aqueous zinc-ion batteries 用于稳定的锌-离子水电池的桦烷型二氧化锰/膨胀石墨阴极的缩小晶格间距

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jelechem.2024.118732

Changxin Han , Juanjuan Cheng , Yun Ou , Longfei Liu , Yuxuan Xiao , Shuang Du , Changzhang Jian

Manganese oxides (MnO_x) have attracted much attention due to abundant resource, low cost and eco-friendliness. In this study, birnessite type manganese dioxide/expanded graphite composites (KMO/EG) with a reduced lattice spacing of nanoflower and nanowire heterostructure KMO have been synthesized by a one-step hydrothermal method. The morphology of KMO has transformed from nanoflower to nanowire with a reduced lattice spacing due to nucleation sites on the surface of EG. The KMO/EG achieves a specific capacity of 444.5mAh g⁻¹ and remains at 387.9mAh g⁻¹ after 100 cycles at 0.1 A g ⁻¹ for Zn-ion battery. The enhanced specific capacity of KMO/EG is mainly attributed to the capacity contribution of EG and the good stability is related to the more stable structure of KMO caused by reduced lattice spacing.

锰氧化物（MnOx）因资源丰富、成本低廉和生态友好而备受关注。本研究采用一步水热法合成了晶格间距缩小为纳米花和纳米线异质结构的桦烷型二氧化锰/膨胀石墨复合材料（KMO/EG）。由于 EG 表面存在成核点，KMO 的形态从纳米花转变为晶格间距减小的纳米线。KMO/EG 的比容量达到了 444.5mAh g-1，在 0.1 A g -1 的锰离子电池条件下循环 100 次后仍保持在 387.9mAh g-1。KMO/EG 比容量的提高主要归功于 EG 的容量贡献，而良好的稳定性则与晶格间距减小导致 KMO 结构更加稳定有关。

引用次数: 0

Enhancement of critical current density using micro-porous structure in a low-temperature water electrolysis 在低温水电解中利用微多孔结构提高临界电流密度

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-21 DOI: 10.1016/j.jelechem.2024.118731

Su-Yeon Park , Dong-Hyuk Park , Haekyun Park , Bum-Jin Chung

The critical current density (CCD), which limits the hydrogen production rate was measured by forming micro-porous structures on the cathode electrode in a low-temperature water electrolysis. Several micro-porous structures were formed by the electrodeposition method varying the current density during the deposition. A maximum 54% enhancement of the CCD was recorded compared to the plain surface. With the micro-porous structures, the superior capillary wicking effect allowed the electrolyte to penetrate the structure, resulting in the increased number of hydrogen nucleation sites. The increased hydrogen nucleation sites led to the decreased hydrogen bubble size and increased departed bubble density, which delayed formation of the hydrogen film leading to the CCD. The surface morphology revealed that the multiple pore layers with the interconnected pores exhibited superior capillary wicking effect compared to the open type single pore layer. It is expected that the results of present work stimulate further research regarding electrode surface design in the low-temperature water electrolysis.

通过在低温水电解的阴极电极上形成微孔结构，测量了限制氢气生产率的临界电流密度（CCD）。通过在沉积过程中改变电流密度的电沉积方法，形成了多种微孔结构。与普通表面相比，CCD 最多增强了 54%。在微孔结构中，优异的毛细管吸附效应使电解质能够渗透到结构中，从而增加了氢成核点的数量。氢成核点的增加导致氢气泡尺寸减小，离去气泡密度增加，从而延迟了氢膜的形成，导致 CCD 的形成。表面形态显示，与开放型单孔层相比，孔隙相互连接的多孔层表现出更优越的毛细管吸湿效果。本研究的结果有望进一步推动低温水电解电极表面设计方面的研究。

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引用次数: 0

Synergistic effects of MXene and Co3O4 in composite electrodes: High-performance energy storage solutions 复合电极中 MXene 和 Co3O4 的协同效应：高性能储能解决方案

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-20 DOI: 10.1016/j.jelechem.2024.118720

Jiawei Wu , Yuanqing Chen , Xujiang Liang , Muslum Demir , Weibai Bian

The development of high-performance electrode materials is crucial for advancing supercapacitor technology. The two-dimensional layered structure of MXene (Ti₃C₂T_x) presents high conductivity, abundant surface functional groups and accessible ion interaction between layers. However, the MXene suffers from the layer aggregation. To overcome this issue, we synthesized a composite material combining MXene with cobalt oxide (Co₃O₄) to enhance electrochemical performance in supercapacitors. MXene’s two-dimensional layered structure, high conductivity, and abundant surface functional groups allow for efficient ion intercalation, while Co₃O₄ contributes high theoretical capacitance and rich oxidation states. The resulted MXene/Co₃O₄ composite exhibits an impressive areal capacitance of 6.456F/cm² at a current density of 3 mA/cm², maintaining 90.52 % capacitance retention at 30 mA/cm², and 81.37 % capacity after 5000 charge–discharge cycles. Additionally, the asymmetric supercapacitor (ASC) device fabricated using the MXene/Co₃O₄ composite achieves a power density of 6.41 mW/cm² at an energy density of 0.37 mWh/cm², with 82.3 % capacitance retention after 5000 cycles. These results demonstrate that the MXene/Co₃O₄ composite material is a promising candidate for high-performance supercapacitors, offering significant improvements in rate capability and long-term cycling stability.

开发高性能电极材料对于推动超级电容器技术的发展至关重要。二维层状结构的 MXene（Ti3C2Tx）具有高导电性、丰富的表面官能团和层间可进行离子相互作用。然而，MXene 存在层聚集的问题。为了克服这一问题，我们合成了一种 MXene 与氧化钴（Co3O4）的复合材料，以提高超级电容器的电化学性能。MXene 的二维层状结构、高导电性和丰富的表面官能团可实现高效离子插层，而 Co3O4 则具有高理论电容和丰富的氧化态。最终得到的 MXene/Co3O4 复合材料在电流密度为 3 mA/cm2 时显示出 6.456F/cm2 的惊人面积电容，在 30 mA/cm2 时保持 90.52% 的电容保持率，在 5000 次充放电循环后保持 81.37% 的电容量。此外，使用 MXene/Co3O4 复合材料制造的非对称超级电容器 (ASC) 器件在能量密度为 0.37 mWh/cm2 的情况下功率密度达到 6.41 mW/cm2，5000 次循环后电容保持率为 82.3%。这些结果表明，MXene/Co3O4 复合材料是高性能超级电容器的理想候选材料，可显著提高速率能力和长期循环稳定性。

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引用次数: 0

The formation of three-dimensional phosphorus-doped MoO2/C nanostructures for high-performance aqueous zinc-ion batteries 形成用于高性能锌离子水电池的三维掺磷 MoO2/C 纳米结构

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-20 DOI: 10.1016/j.jelechem.2024.118729

Xiao Zhang, Peng Huang, Mengjie Li, Chuxin Deng, Shilei Xie, Dong Xie, Peng Liu, Min Zhang, Faliang Cheng

MoO₂ is considered as a promising cathode for zinc ion batteries (ZIBs) due to its high electronic conductivity, high theoretical capacity, and other advantages. However, MoO₂ shows significant volume changes during ion insertion/de-insertion, leading to a decrease in battery cycling performance. In this paper, a novel P-MoO₂/C heterostructure was prepared by introducing carbon skeleton in situ and phosphorus doping subsequently. Due to the rigid carbon structure and oxygen vacancies, the structural degradation of MoO₂ was inhibited during the zinc ions intercalation/de-intercalation. Compared with the undoped MoO₂/C and commercial MoO₂, P-MoO₂/C demonstrates a superior cycle stability including a high initial discharge specific capacity of 197.3 mAh·g⁻¹ at 0.1A·g⁻¹ and 60.8 % capacity retention after 200 cycles at 1A·g⁻¹. This works provides a new pathway for the design of specialized structures as well as the enhancement of zinc storage capabilities of MoO_2.

由于具有高电子传导性、高理论容量和其他优点，二氧化硅被认为是锌离子电池（ZIB）的一种有前途的阴极。然而，MoO2 在离子插入/拔出过程中会出现明显的体积变化，导致电池循环性能下降。本文通过原位引入碳骨架并随后掺入磷，制备了一种新型 P-MoO2/C 异质结构。由于刚性碳结构和氧空位的存在，MoO2 在锌离子插层/去插层过程中的结构降解得到了抑制。与未掺杂的 MoO2/C 和商用 MoO2 相比，P-MoO2/C 表现出更优越的循环稳定性，在 0.1A-g-1 条件下的初始放电比容量高达 197.3 mAh-g-1，在 1A-g-1 条件下循环 200 次后的容量保持率为 60.8%。这项研究为设计特殊结构以及提高 MoO2 的储锌能力提供了新的途径。

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引用次数: 0

Revisiting the role of foreign atoms in CO2 reduction on CuSn single-atom surface alloys 重新审视外来原子在 CuSn 单原子表面合金上还原二氧化碳过程中的作用

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-20 DOI: 10.1016/j.jelechem.2024.118718

Vitaliy A. Kislenko , Sergey A. Kislenko , Victoria A. Nikitina

The electrochemical

{CO}_{2}

reduction is a promising process for capturing the emitted carbon dioxide by converting

{CO}_{2}

into value-added chemicals. Although copper-based catalysts have a unique ability to produce multi-carbon products, they suffer from poor selectivity. Copper-based alloys and, in particular, single atom alloys, hold promise for fine-tuning the selectivity of

{CO}_{2}

reduction reaction. In this study, we applied the grand canonical density functional theory in combination with the implicit solvent to model

{CO}_{2}

electroreduction with the formation of CO and

{HCOO}^{-}

on copper and highly diluted copper-tin alloys. We demonstrate that the insertion of a substitutional Sn atom introduces a destabilization effect for all intermediates and completely disrupts the adsorption positions of the CO, H, and H/

{CO}_{2}

co-adsorption. However, the influence of Sn on intermediate adsorption energies is primarily localized in its immediate vicinity. We demonstrate that sparsely distributed single Sn atoms do not account for the experimentally observed significant reduction in formate and hydrogen generation across the entire Sn-substituted Cu surface. This discrepancy underscores the need to reevaluate the proposed surface structure and the nature of the active sites on CuSn single-atom surface alloys.

电化学二氧化碳还原法是将二氧化碳转化为高附加值化学品，从而捕获排放的二氧化碳的一种前景广阔的工艺。虽然铜基催化剂具有生产多碳产品的独特能力，但其选择性较差。铜基合金，尤其是单原子合金，有望微调二氧化碳还原反应的选择性。在本研究中，我们结合隐式溶剂，运用大规范密度泛函理论，模拟了在铜和高稀释铜锡合金上形成 CO 和 HCOO- 的 CO2 电还原反应。我们证明，插入一个取代的 Sn 原子会对所有中间产物产生不稳定效应，并完全破坏 CO、H 和 H/CO2 共吸附的吸附位置。然而，锡对中间产物吸附能的影响主要集中在其附近。我们证明，稀疏分布的单个锡原子并不能解释实验观察到的整个锡取代铜表面甲酸根和氢生成量显著减少的原因。这种差异突出表明，有必要重新评估所提出的表面结构以及铜锡单原子表面合金上活性位点的性质。

{"title":"Revisiting the role of foreign atoms in CO2 reduction on CuSn single-atom surface alloys","authors":"Vitaliy A. Kislenko , Sergey A. Kislenko , Victoria A. Nikitina","doi":"10.1016/j.jelechem.2024.118718","DOIUrl":"10.1016/j.jelechem.2024.118718","url":null,"abstract":"<div><div>The electrochemical <math><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub></math> reduction is a promising process for capturing the emitted carbon dioxide by converting <math><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub></math> into value-added chemicals. Although copper-based catalysts have a unique ability to produce multi-carbon products, they suffer from poor selectivity. Copper-based alloys and, in particular, single atom alloys, hold promise for fine-tuning the selectivity of <math><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub></math> reduction reaction. In this study, we applied the grand canonical density functional theory in combination with the implicit solvent to model <math><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub></math> electroreduction with the formation of CO and <math><msup><mrow><mi>HCOO</mi></mrow><mrow><mo>−</mo></mrow></msup></math> on copper and highly diluted copper-tin alloys. We demonstrate that the insertion of a substitutional Sn atom introduces a destabilization effect for all intermediates and completely disrupts the adsorption positions of the CO, H, and H/<math><msub><mrow><mi>CO</mi></mrow><mrow><mn>2</mn></mrow></msub></math> co-adsorption. However, the influence of Sn on intermediate adsorption energies is primarily localized in its immediate vicinity. We demonstrate that sparsely distributed single Sn atoms do not account for the experimentally observed significant reduction in formate and hydrogen generation across the entire Sn-substituted Cu surface. This discrepancy underscores the need to reevaluate the proposed surface structure and the nature of the active sites on CuSn single-atom surface alloys.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118718"},"PeriodicalIF":4.1,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Core-shell structure and high rate performance of Ce-doped Li4Ti5O12 for lithium-ion battery anode materials 用于锂离子电池负极材料的掺杂 Ce 的 Li4Ti5O12 的核壳结构和高倍率性能

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-18 DOI: 10.1016/j.jelechem.2024.118725

Long Shen , Zuming He , Kai Lin , Jiangbin Su , Jun Yi , Longlong Chen , Yongmei Xia

Lithium titanate (LTO) can be a very promising anode material for lithium-ion batteries (LSBs) due to its inherent ability to inhibit the growth of lithium dendrites as well as its unique “zero-strain” properties. Unfortunately, the low electronic conductivity of LTO leads to serious shortcomings in higher electrochemical demands. In this work, the Ce³⁺-doped C@Li₄Ti₅-_xCe_xO₁₂ (x = 0, 0.1, 0.15 and 0.2) anode materials synthesized by the hydrothermal method using carbon spheres as templates showed more significant improvement in both structural and electrochemical properties. The results demonstrate that electronic conductivity, lithium-ion diffusion rate, discharge specific capacity, discharge rate capability, and significant improvement stability of C@Li₄Ti₅-_xCe_xO₁₂ (x = 0.1, 0.15 and 0.2) electrodes. Among them, C@Li₄Ti_4.85Ce_0.15O₁₂ electrode exhibits the highest initial discharge specific capacity (250.86 mAh/g) at 0.1C, which is 1.28-fold that of C@ Li₄Ti₅O₁₂ (195.94 mAh/g), and initial discharge capacity from 205.96 mAh/g to 170.39 mAh/g after 500 cycles, corresponding to 82.7 % of the initial stable discharge capacity. The outstanding performance of C@Li₄Ti_4.85Ce_0.15O₁₂ can be attributed to the lower interfacial impedance, higher electronic conductivity, high oxygen vacancy concentration, and moderate amount of Ce³⁺ doping can enhance the electrochemical activity. In addition, carbon sphere surface defects shown to be effective in improving lithium-ion storage. This work demonstrates that Ce³⁺ doping is an effective method to improve the electrochemical performance of LTOs and provides a more effective guide for designing and optimizing anode electrode materials for lithium-ion batteries.

钛酸锂（LTO）具有抑制锂枝晶生长的固有能力和独特的 "零应变 "特性，因此是一种非常有前途的锂离子电池（LSB）负极材料。遗憾的是，LTO 的低电子传导性导致其在更高的电化学要求下存在严重缺陷。在这项工作中，以碳球为模板，通过水热法合成的掺杂 Ce3+ 的 C@Li4Ti5-xCexO12（x = 0、0.1、0.15 和 0.2）正极材料在结构和电化学性能方面都有了更显著的改善。结果表明，C@Li4Ti5-xCexO12（x = 0.1、0.15 和 0.2）电极的电子电导率、锂离子扩散率、放电比容量、放电速率能力和稳定性都有显著提高。其中，C@Li4Ti4.85Ce0.15O12 电极在 0.1C 时的初始放电比容量（250.86 mAh/g）最高，是 C@Li4Ti5O12 （195.94 mAh/g）的 1.28 倍，500 次循环后的初始放电容量从 205.96 mAh/g 降至 170.39 mAh/g，相当于初始稳定放电容量的 82.7%。C@Li4Ti4.85Ce0.15O12 的优异性能可归因于较低的界面阻抗、较高的电子电导率、较高的氧空位浓度以及适量的 Ce3+ 掺杂可增强电化学活性。此外，碳球表面缺陷也能有效改善锂离子存储。这项研究表明，掺杂 Ce3+ 是提高 LTO 电化学性能的有效方法，并为锂离子电池负极电极材料的设计和优化提供了更有效的指导。

{"title":"Core-shell structure and high rate performance of Ce-doped Li4Ti5O12 for lithium-ion battery anode materials","authors":"Long Shen , Zuming He , Kai Lin , Jiangbin Su , Jun Yi , Longlong Chen , Yongmei Xia","doi":"10.1016/j.jelechem.2024.118725","DOIUrl":"10.1016/j.jelechem.2024.118725","url":null,"abstract":"<div><div>Lithium titanate (LTO) can be a very promising anode material for lithium-ion batteries (LSBs) due to its inherent ability to inhibit the growth of lithium dendrites as well as its unique “zero-strain” properties. Unfortunately, the low electronic conductivity of LTO leads to serious shortcomings in higher electrochemical demands. In this work, the Ce3+-doped C@Li4Ti5-xCexO12 (x = 0, 0.1, 0.15 and 0.2) anode materials synthesized by the hydrothermal method using carbon spheres as templates showed more significant improvement in both structural and electrochemical properties. The results demonstrate that electronic conductivity, lithium-ion diffusion rate, discharge specific capacity, discharge rate capability, and significant improvement stability of C@Li4Ti5-xCexO12 (x = 0.1, 0.15 and 0.2) electrodes. Among them, C@Li4Ti4.85Ce0.15O12 electrode exhibits the highest initial discharge specific capacity (250.86 mAh/g) at 0.1C, which is 1.28-fold that of C@ Li4Ti5O12 (195.94 mAh/g), and initial discharge capacity from 205.96 mAh/g to 170.39 mAh/g after 500 cycles, corresponding to 82.7 % of the initial stable discharge capacity. The outstanding performance of C@Li4Ti4.85Ce0.15O12 can be attributed to the lower interfacial impedance, higher electronic conductivity, high oxygen vacancy concentration, and moderate amount of Ce3+ doping can enhance the electrochemical activity. In addition, carbon sphere surface defects shown to be effective in improving lithium-ion storage. This work demonstrates that Ce3+ doping is an effective method to improve the electrochemical performance of LTOs and provides a more effective guide for designing and optimizing anode electrode materials for lithium-ion batteries.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"974 ","pages":"Article 118725"},"PeriodicalIF":4.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ag@Au core–shell nanoparticles modified glassy carbon electrode synthesized by simple displacement reaction for non-enzymatic electrochemical glucose sensing 通过简单置换反应合成的 Ag@Au 核壳纳米粒子修饰的玻璃碳电极用于非酶电化学葡萄糖传感

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-18 DOI: 10.1016/j.jelechem.2024.118726

Huiling Huang , Tianyu Chen , Xinyu Qin , Bo Quan , Sun Ha Paek , Wang Zhang , Yuanzhe Piao

In this study, a new strategy was presented to enhance glucose sensor performance by modifying a glassy carbon electrode (GCE) with Ag@Au alloy nanoparticles. The synthesis process was designed with a simple replacement reaction to grow the gold layer onto the silver nanparticles to form a core–shell nanostructure. The resulting nanocomposite modified electrode exhibited superior electrocatalytic activity and stability in glucose sensing. Electrochemical measurements were undertaken to assess the performance of the as-synthesized Ag@Au/GCE. The Ag@Au core–shell nanoparticles modified GCE exhibited outstanding catalytic activity towards glucose detection, resulting in a high current response and a robust linear relationship between concentrations (10 μM–10 mM); the detection limit was remarkably low, at 0.04 μM. This sensor demonstrated a wide linear range, low detection limit, and high levels of selectivity and stability, rendering it suitable for accurate glucose quantification in biological samples.

本研究提出了一种用 Ag@Au 合金纳米粒子修饰玻璃碳电极 (GCE) 以提高葡萄糖传感器性能的新策略。合成工艺设计采用简单的置换反应，在银纳米颗粒上生长金层，形成核壳纳米结构。由此获得的纳米复合修饰电极在葡萄糖传感中表现出卓越的电催化活性和稳定性。电化学测量评估了合成的 Ag@Au/GCE 的性能。经 Ag@Au 核壳纳米颗粒修饰的 GCE 在葡萄糖检测方面表现出了卓越的催化活性，从而产生了高电流响应，并且在浓度（10 μM-10 mM）之间具有稳健的线性关系；检测限非常低，仅为 0.04 μM。这种传感器具有线性范围宽、检测限低、选择性高和稳定性强等特点，因此适用于生物样品中葡萄糖的精确定量。

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引用次数: 0

Inhibition of microbiologically influenced corrosion of Al alloy 5083 in the presence of Pseudomonas aeruginosa by Artemisia annua L 黄花蒿抑制铜绿假单胞菌存在下受微生物影响的铝合金 5083 的腐蚀

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-18 DOI: 10.1016/j.jelechem.2024.118727

Gloria Zlatić , Ivana Martinović , Zora Pilić , Janez Kovač , Stipe Čelan

Microbiologically influenced corrosion (MIC¹) of Al 5083 caused by P. aeruginosa was inhibited by A. annua aqueous extract (AAE²). Electrochemical measurements revealed that the adsorption of AAE on the electrode surface protected Al 5083 from MIC in a simulated marine environment with inhibition efficiency of 78 %. The adsorption layer was formed due to ionized chlorogenic acid interacting with charged Al 5083 surface, preventing bacterial adhesion and growth. Adding AAE promoted the formation of a protective Al₂O₃, and decreased the surface layer porosity. The pitting corrosion reduced considerably when AAE was added to biotic seawater, supporting the ICP-OES results.

A. annua 水提取物（AAE2）抑制了铜绿微囊藻对 Al 5083 的微生物腐蚀（MIC1）。电化学测量结果表明，在模拟海洋环境中，AAE 在电极表面的吸附保护了 Al 5083 免受 MIC 的腐蚀，其抑制效率为 78%。吸附层的形成是由于电离的绿原酸与带电的 Al 5083 表面相互作用，阻止了细菌的粘附和生长。添加 AAE 可促进保护性 Al2O3 的形成，并降低表面层的孔隙率。在生物海水中添加 AAE 后，点蚀现象大大减少，这与 ICP-OES 的结果相吻合。

引用次数: 0

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