Journal of Electroanalytical Chemistry最新文献_第4页

In situ formation of sub nanometer cobalt particle with platinum nanocrystal for high performance oxygen reduction reaction electrocatalyst 原位形成亚纳米钴颗粒与铂纳米晶，用于高性能氧还原反应电催化剂

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-29 DOI: 10.1016/j.jelechem.2024.118747

Mohmmad Khalid , Ana Maria Borges Honorato , Ximena Zarate , Shahid Zaman , Eduardo Schott , Samaneh Shahgaldi

Hitherto, platinum (Pt) is the most active electrocatalyst for the oxygen reduction reaction (ORR) of the proton exchange membrane fuel cells (PEMFCs). Enhancing the performance and reducing the use of costly Pt is of great significance for the wider adoption of PEMFCs. The present research demonstrates in situ synthesized Pt nanocrystal immobilized with sub nanometer sized cobalt (Co) particles (≤ 0.3 nm) loaded on ketjenblack carbon (KB) support via a simple polyol method as a highly active ORR electrocatalyst. The as synthesized Pt_4.1Co/KB catalyst featured a more positive halfwave potential of 0.925 V with a resultant of 1.8 times higher mass activity than Co free Pt/KB catalyst at 0.9 V in 0.1 M HClO₄ and insignificant decay in ORR performance after 30,000 potential cycles. The excellent electrocatalytic performance of Pt_4.1Co/KB has also been proven in a practical H₂/air fuel cell, demonstrating a maximum peak power density of 1.08 W/cm², comparable to the standard Pt/C-TKK (47 %) catalyst. The improved ORR performance of Pt_4.1Co/KB is attributed to the incorporation of sub nanometer sized Co particles, which synergistically enhance the activity and stability. Computational studies using periodic density functional theory calculations also suggest that the integration of ultrafine Co nanoparticles shifted the Pt contribution to the density of states towards higher energy levels, thereby facilitating the ORR process for the Pt_4.1Co/KB catalyst. This work provides a distinctive development of an efficient and robust ORR catalyst for advancing PEMFCs.

迄今为止，铂（Pt）是质子交换膜燃料电池（PEMFC）氧还原反应（ORR）中最活跃的电催化剂。提高性能和减少使用昂贵的铂对 PEMFC 的广泛应用具有重要意义。本研究通过一种简单的多元醇方法，将原位合成的铂纳米晶体与亚纳米尺寸的钴（Co）颗粒（≤ 0.3 nm）固定在黑碳（KB）载体上，作为一种高活性 ORR 电催化剂。合成的 Pt4.1Co/KB 催化剂具有 0.925 V 的正半波电位，在 0.1 M HClO4 溶液中 0.9 V 的电位下，其质量活性是无钴 Pt/KB 催化剂的 1.8 倍，且在 30,000 次电位循环后 ORR 性能衰减不明显。Pt4.1Co/KB 的优异电催化性能在实际的 H2/air 燃料电池中也得到了证实，其最大峰值功率密度为 1.08 W/cm2，与标准的 Pt/C-TKK (47 %) 催化剂相当。Pt4.1Co/KB ORR 性能的提高归功于亚纳米级 Co 粒子的加入，它们协同提高了催化剂的活性和稳定性。利用周期密度泛函理论进行的计算研究还表明，超细 Co 纳米粒子的加入使铂对状态密度的贡献向高能级转移，从而促进了 Pt4.1Co/KB 催化剂的 ORR 过程。这项工作为开发高效、稳健的 ORR 催化剂提供了独特的方法，从而推动了 PEMFC 的发展。

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引用次数: 0

Intercalation design of layered vanadium phosphate based cathode material towards high-performance aqueous zinc-ion batteries 基于层状磷酸钒的阴极材料的互钙化设计，以实现高性能水性锌离子电池

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-29 DOI: 10.1016/j.jelechem.2024.118755

Yan Li , Wenxin Li , Hongming Chen , Zijin Liu , Xue Li , Dan Zhou

Aqueous zinc-ion batteries (AZIBs) have attracted significant attention because of high theoretical energy density, low cost, environmental friendliness and high safety. Among various cathode materials, vanadium phosphate (VOPO₄) with a layered structure exhibits huge potential due to high Zn-storage capacity. However, the poor intrinsic conductivity and structural deterioration during the cycling process always result in low Zn²⁺ diffusion coefficient and weak reversibility. Herein, a novel potassium vanadyl phosphate (KVOPO₄) cathode material was designed by the intercalation of K⁺ into the interlayer of VOPO₄ via a simple solvothermal reaction. Benefiting from the unique layered structure and intercalation effect, the KVOPO₄ electrode exhibits large discharge capacity and enhanced cycling stability (153.2 mAh g⁻¹ at 1 A/g after 400 cycles), and excellent rate capability (119.4 mAh g⁻¹ at 5.0 A/g). The electrode also suggests a pseudocapacitance controlled storage behavior with high contribution percentage of 98 % at 0.8 mV/s. Besides, ex-situ XRD and XPS were conducted to demonstrate the related phase transitions upon the Zn²⁺ insertion/extraction process, revealing the reversible Zn-storage mechanism of the KVOPO₄. This work is expected to enrich the design strategy of VOPO₄-based cathode materials and pave the exploration of high-performance AZIBs towards energy storage applications.

锌离子水电池（AZIBs）具有理论能量密度高、成本低、环保和安全性高等优点，因此备受关注。在各种正极材料中，具有层状结构的磷酸钒（VOPO4）因具有较高的锌储存能力而展现出巨大的潜力。然而，由于其内在导电性较差，且在循环过程中结构会发生退化，因此总是导致 Zn2+ 扩散系数较低，可逆性较弱。在此，通过简单的溶热反应将 K+ 插层到 VOPO4 的夹层中，设计出了一种新型磷酸二氢钾（KVOPO4）阴极材料。得益于独特的层状结构和插层效应，KVOPO4 电极表现出较大的放电容量和更高的循环稳定性（400 次循环后，1 A/g 时为 153.2 mAh g-1），以及出色的速率能力（5.0 A/g 时为 119.4 mAh g-1）。该电极还具有伪电容控制存储行为，在 0.8 mV/s 时的贡献率高达 98%。此外，还进行了原位 XRD 和 XPS 研究，以证明 Zn2+ 插入/萃取过程中的相关相变，从而揭示 KVOPO4 的可逆 Zn 储存机制。这项工作有望丰富基于 VOPO4 的阴极材料的设计策略，并为探索高性能 AZIBs 的储能应用铺平道路。

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引用次数: 0

MOF-derived Na3V2(PO4)3-carbon@graphene fibers for flexible fiber-shaped sodium ion battery 用于柔性纤维状钠离子电池的 MOF 衍生 Na3V2(PO4)3-carbon@graphene 纤维

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.jelechem.2024.118740

Xiaoxuan Ma , He Zhang , Ying Liu , Wenning Yan , Chao Chen , Kun Zhang

With the growing popularity of wearable devices, fiber-shaped rechargeable batteries become increasingly important as the next-generation energy storage devices. However, the practical applications are hindered by the limitation of sluggish kinetics of the Na⁺ transport and poor conductivity. Herein, a novel composite fiber was designed and fabricated as a cathode material for fiber-shaped Na-ion batteries (SIBs). The unique architecture on the fiber surface has three-dimensional porous structure, numerous channels for Na⁺ and electron transport, that facilitates electrolyte infiltration and strain-relaxed substructure. Na₃V₂(PO₄)₃ nanoparticles are uniformly incorporated into carbon matrix. The as-prepared fiber shows improved conductivity, accelerated Na⁺ diffusion kinetics and enhanced mechanical properties. The resulting composite fiber achieves a reversible specific capacity of 57.1mAh g⁻¹ after 1000 cycles with 86.0 % capacity retention and exhibited a superior rate capability via half-cells. Furthermore, the fiber-shaped full SIBs were also fabricated, which present a reversible capacity of 18.2 μAh cm⁻¹ at different bending angles. The full batteries exhibit excellent rate performance, stable cycling capability, and outstanding flexibility. This work may provide new insights into fiber-shaped SIBs for actual wearable applications.

随着可穿戴设备的日益普及，纤维状可充电电池作为下一代储能设备变得越来越重要。然而，Na+传输动力学缓慢和导电性差等限制因素阻碍了其实际应用。在此，我们设计并制造了一种新型复合纤维，作为纤维状纳离子电池（SIB）的阴极材料。纤维表面的独特结构具有三维多孔结构、大量的 Na+ 和电子传输通道，有利于电解质渗透和应变松弛子结构。Na3V2(PO4)3 纳米粒子均匀地融入碳基质中。制备的纤维具有更好的导电性、更快的 Na+ 扩散动力学和更强的机械性能。所制备的复合纤维在 1000 次循环后的可逆比容量达到 57.1mAh g-1，容量保持率为 86.0%，并通过半电池表现出卓越的速率能力。此外，还制作了纤维状全 SIB，在不同弯曲角度下的可逆容量为 18.2 μAh cm-1。这种全电池具有优异的速率性能、稳定的循环能力和出色的柔韧性。这项工作可能会为纤维状 SIB 在实际可穿戴应用中的应用提供新的见解。

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引用次数: 0

Electrodeposition of Cu-based nanoarrays with tailored hierarchical nanostructure and their application for electrochemical nitrate sensing 具有定制分层纳米结构的铜基纳米阵列的电沉积及其在电化学硝酸盐传感中的应用

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.jelechem.2024.118744

Zhengyang Yang , Cuilei Li , Dayou Luo , Jianqiang Wei , Fanglin Che , Zhiyong Gu

Excessive nitrate content in the ecosystem has raised environmental concerns as a contaminant in soil and water bodies. Therefore, there is a consistent demand for rapid and continuous detection technologies with simple operational processes. In this work, we present a Cu-based nanoarray fabricated by a template-assisted electrodeposition process. By varying the deposition current density, the nanoarray exhibited a hierarchical nanoneedle structure with a sharp-needle terminal. Structural analysis confirmed that the metallic Cu nanoneedle has a unique crystal structure compared to the control samples of foil or wire structures. The possible deposition mechanism of nanoneedle was discussed based on the initial crystal formation step during electrodeposition. Furthermore, we explored the sensing performance of the Cu nanoarrays through electrochemical nitrate detection by using cyclic voltammetry (CV). The effect of the needle length on sensing performance was evaluated and the 7 μm nanoneedle array showed the highest sensitivity of 1.22 μA μM⁻¹ cm⁻² and a wide detection range of 0.25 mM to 16 mM, about 41-fold enhancement compared to the Cu foil. The square-wave voltammetry (SWV) method was further utilized for the low nitrate content detection (0.02 mM to 0.3 mM) and the nanoneedle array achieved an improved sensitivity of 6.99 μA μM⁻¹ cm⁻² and an LOD of 26 μM. The interference study indicated a good tolerance to various interference species. Multiple cycle scans and long term stability tests were conducted using the nanoneedle electrode, which maintained 80 % sensing response after 25 scan tests and close to 95 % sensing response after 21 testing days. The nanoneedle electrode also demonstrated sensing capability in analyzing nitrate species in a real water sample (tap water). Our work provides a convenient method to obtain a hierarchical metallic nanostructure, and the Cu-based nanoarrays show potential for sensitive detection of nitrate across a wide range of applications.

生态系统中硝酸盐含量过高，已成为土壤和水体中的一种污染物，引发了环境问题。因此，人们一直需要操作过程简单的快速连续检测技术。在这项工作中，我们介绍了一种通过模板辅助电沉积工艺制作的铜基纳米阵列。通过改变沉积电流密度，纳米阵列呈现出具有尖针末端的分层纳米针状结构。结构分析证实，与金属箔或金属丝结构的对照样品相比，金属铜纳米针具有独特的晶体结构。根据电沉积过程中晶体形成的初始步骤，讨论了纳米针的可能沉积机制。此外，我们还利用循环伏安法（CV）通过电化学硝酸盐检测探讨了铜纳米阵列的传感性能。与铜箔相比，7 μm 纳米针阵列的灵敏度最高，达到 1.22 μA μM-1 cm-2，检测范围广，从 0.25 mM 到 16 mM，提高了约 41 倍。方波伏安法（SWV）进一步用于低硝酸盐含量（0.02 mM 至 0.3 mM）的检测，纳米针阵列的灵敏度提高到 6.99 μA μM-1 cm-2，LOD 为 26 μM。干扰研究表明，该方法对各种干扰具有良好的耐受性。使用纳米针电极进行了多次循环扫描和长期稳定性测试，该电极在 25 次扫描测试后保持了 80% 的传感响应，在 21 个测试日后接近 95% 的传感响应。纳米针电极在分析真实水样（自来水）中的硝酸盐种类时也表现出了感应能力。我们的工作提供了一种获得分层金属纳米结构的简便方法，基于铜的纳米阵列显示了在广泛应用中灵敏检测硝酸盐的潜力。

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引用次数: 0

Unravelling The charge storage mechanism in V2O5 nanorods through Systematic structural and electrochemical study 通过系统的结构和电化学研究揭示 V2O5 纳米棒的电荷存储机制

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.jelechem.2024.118745

Misbah Mumtaz , Asifa Mumtaz

In the present research, we report on vanadium pentoxide (V₂O₅) nanorods, fabricated via a simple sol–gel route, which displayed exceptional performance as electrode material for supercapacitor applications. Rigorous structural and morphological analyses were employed to gain a comprehensive understanding of the key physical parameters involved. Subsequently, standard electroanalytical techniques, including scan rate study (CV), galvanostatic charging/discharging (GCD), and electrochemical impedance spectroscopy (EIS), were used for detailed electrochemical assessment and to investigate the influence of physical parameters on electrochemical attributes. The investigated electrode material displayed a specific capacitance of 365F g⁻¹ at a current density of 1 A g⁻¹ in 2 M NaOH electrolyte. The nominated electrode also exhibited an outstanding energy density of 12.67 Wh kg⁻¹ at an adequate power density of 247.15 W kg⁻¹, with an impressive capacitance retention of 91 % over 5000 cycles. The choice of material, along with the nanostructured design featuring rod-like morphology, played a crucial role in achieving superior performance as a supercapacitor electrode. These insights are vital for investigating structural and morphological changes in V₂O₅-based materials during electrochemical operations.

在本研究中，我们报告了通过简单的溶胶-凝胶路线制备的五氧化二钒（V2O5）纳米棒，该纳米棒作为超级电容器应用的电极材料显示出卓越的性能。为了全面了解其中的关键物理参数，研究人员采用了严格的结构和形态分析。随后，采用标准电分析技术，包括扫描速率研究（CV）、电静态充放电（GCD）和电化学阻抗光谱（EIS），进行了详细的电化学评估，并研究了物理参数对电化学属性的影响。在 2 M NaOH 电解液中，电流密度为 1 A g-1 时，所研究的电极材料显示出 365F g-1 的比电容。在 247.15 W kg-1 的足够功率密度下，提名电极还显示出 12.67 Wh kg-1 的出色能量密度，在 5000 次循环中电容保持率高达 91%。材料的选择以及具有棒状形态的纳米结构设计在实现超级电容器电极的卓越性能方面发挥了至关重要的作用。这些见解对于研究基于 V2O5 的材料在电化学操作过程中的结构和形态变化至关重要。

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引用次数: 0

Synthesis and performance of cross-linked poly(aryl ether nitrile) anion exchange membranes with dense cations and flexible side-chain structures for water electrolysis 用于电解水的具有致密阳离子和柔性侧链结构的交联聚（芳基醚腈）阴离子交换膜的合成及其性能

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.jelechem.2024.118750

Jianxiong Hu , Kexin Chen , Aman Liu , Xiaojing Zhang , Jian Li , Chenyi Wang , Xiaoyan Zhao

Anion exchange membranes (AEMs) are the core components in anion exchange membrane water electrolysis (AEMWE), which play crucial role and affect the performance of AEMWE. In this work, a series of cross-linked poly(aryl ether nitrile) anion exchange membranes (CPAEN-dDQA-x) with dense cations and flexible side-chain structures are synthesized. By introducing multiple modification elements into the polymer structure simultaneously, the ion conductivity, dimensional stability, and alkali resistance stability of the prepared AEMs are effectively improved and balanced. The representative CPAEN-dDQA-0.25 showed water absorption of only 27.6 %, swelling rate of 11.2 %, and conductivity of 115.37 mS/cm at 80°C. The IEC and conductivity retention value of CPAEN-dDQA-0.25 after in 2 M NaOH solution at 80°C for 480 h were up to 86.2 % and 82 %, respectively. Meanwhile, the current density of the water electrolysis cell based on CPAEN-dDQA-0.25 is up to 477.0 mA/cm² in 1 M KOH and 2.2 V, and its voltage don’t has significant change after 480 h of operation at a constant current density of 500 mA/cm².

阴离子交换膜（AEMs）是阴离子交换膜电解水（AEMWE）的核心部件，对AEMWE的性能起着至关重要的影响。本研究合成了一系列具有致密阳离子和柔性侧链结构的交联聚（芳基醚腈）阴离子交换膜（CPAEN-dDQA-x）。通过在聚合物结构中同时引入多种改性元素，制备的阴离子交换膜的离子传导性、尺寸稳定性和耐碱稳定性得到了有效的改善和平衡。具有代表性的 CPAEN-dDQA-0.25 在 80°C 时的吸水率仅为 27.6%，膨胀率为 11.2%，电导率为 115.37 mS/cm。在 80°C 的 2 M NaOH 溶液中浸泡 480 小时后，CPAEN-dDQA-0.25 的 IEC 和电导率保持值分别高达 86.2 % 和 82 %。同时，基于 CPAEN-dDQA-0.25 的水电解池在 1 M KOH 和 2.2 V 下的电流密度高达 477.0 mA/cm2，并且在 500 mA/cm2 的恒定电流密度下工作 480 h 后电压没有显著变化。

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引用次数: 0

How does the solution resistance influence the electrochemical behavior of porous electrodes? 溶液电阻如何影响多孔电极的电化学行为？

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.jelechem.2024.118746

Andrzej Lasia

In our recent papers simplified models of the porous electrodes in the presence of the electroactive species were presented. In this work, these models are compared with the full model, which considers dc concentration and potential gradients in the pore and the ac effect by division of the pore length into small sections and addition of the solution resistance to the electrode impedance of each section. Simulations for different porosity, concentration, kinetics, and solution resistivity were carried out and allowed to estimate the influence of these factors on the observed complex plane impedance plots. Presence of the dc gradients changes the size of the two semicircles while the ac solution resistance causes formation of the high-frequency straight line at 45° on the complex plane plots. Porosity effects are larger when the total impedance is smaller, that is for higher currents and concentrations of electroactive species and faster kinetics. Estimation of the porosity parameter (Thiele modulus),

Φ_{0}

, and the parameter v, which relates concentration and potential in pores, allows for the estimation of the porosity effects on the impedance.

In the absence of the concentration gradient (i.e.potential gradient only present), a straight line at 45° followed by one skewed semicircle is observed. Conditions for obtaining such impedances are discussed.

我们在最近的论文中介绍了电活性物质存在时多孔电极的简化模型。在这项工作中，我们将这些模型与完整模型进行了比较，完整模型考虑了孔隙中的直流浓度和电位梯度，以及通过将孔隙长度划分为小段并在每段电极阻抗中加入溶液电阻而产生的交流效应。对不同的孔隙率、浓度、动力学和溶液电阻率进行了模拟，从而估算出这些因素对观测到的复平面阻抗图的影响。直流梯度的存在会改变两个半圆的大小，而交流溶液电阻则会在复平面图上形成 45°的高频直线。当总阻抗较小时，即电流和电活性物质浓度较高且动力学速度较快时，孔隙度效应较大。通过估算孔隙度参数（蒂勒模量）Φ0 和参数 v（孔隙中的浓度和电位之间的关系），可以估算孔隙度对阻抗的影响。讨论了获得这种阻抗的条件。

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引用次数: 0

Electrochemically simple, sensitive, and clean method for monitoring norfloxacin in advanced oxidative processes 在高级氧化过程中监测诺氟沙星的简单、灵敏和清洁的电化学方法

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.jelechem.2024.118752

Crislânia Carla de Oliveira Morais , Keurison Figueredo Magalhães , Elisama Vieira dos Santos , Suely Souza Leal Castro , Carlos A. Martínez-Huitle

In this work, an amperometric analysis strategy using a carbon fiber (CF) rod as an anode was developed to follow the degradation process of the norfloxacin (NOR) molecule via electrochemical advanced oxidation processes (EAOP). The voltammetric study showed that drug oxidation is an irreversible process which involves, in the determining stage of the reaction, a proton and an electron in an EC (electron transfer followed by chemical reaction) mechanism. After optimizing the electroanalytical conditions, CF sensor showed a linear amperometric response at concentrations ranging from 1.6 μmol L⁻¹ to 30.0 μmol L⁻¹, with detection and quantification limits of 0.5 μmol L⁻¹ and 1.8 μmol L⁻¹, respectively, which are sufficient to enable in monitoring the drug during its electrolytic degradation. The results clearly showed that the by-products generated during drug degradation do not interfere with the current signal. Other application scenarios were evaluated, such as the determination of NOR in river waters and in the presence of different drug degradation by-products, obtained after EAOPs in chloride-containing medium, and no interference was observed during the electroanalysis. Therefore, the proposed analytical methodology is promising for monitoring and controlling the treatment of water contaminated with NOR antibiotic.

在这项工作中，开发了一种使用碳纤维（CF）棒作为阳极的安培分析策略，通过电化学高级氧化过程（EAOP）跟踪诺氟沙星（NOR）分子的降解过程。伏安法研究表明，药物氧化是一个不可逆的过程，在反应的决定阶段，质子和电子参与了 EC（电子转移后的化学反应）机制。优化电分析条件后，CF 传感器在 1.6 μmol L-1 至 30.0 μmol L-1 的浓度范围内显示出线性安培响应，检出限和定量限分别为 0.5 μmol L-1 和 1.8 μmol L-1，足以监测药物的电解降解过程。结果清楚地表明，药物降解过程中产生的副产物不会干扰电流信号。还对其他应用场景进行了评估，例如测定河水中的 NOR，以及在含氯介质中进行 EAOPs 后获得的不同药物降解副产物的情况，在电分析过程中未观察到干扰。因此，所提出的分析方法有望用于监测和控制 NOR 抗生素污染水的处理。

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引用次数: 0

Mesocrystalline effect boosts the alloying reaction kinetics of Sb2O4 anode in half/full sodium-ion batteries 介晶效应促进了半/全钠离子电池中 Sb2O4 阳极的合金化反应动力学

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.jelechem.2024.118753

Ling Guo , Liyun Cao , Jianfeng Huang , Jiayin Li , Yong Zhao , Yijun Liu , Xing Wang , Yishou Wang

Mesocrystalline materials are reported to show great advantages in improving electrochemical performance. However, there are no reports about mesocrystalline Sb₂O₄ anode, and the structure advantage in reaction kinetics is unclear. In this work, we have prepared a mesocrystalline Sb₂O₄ structure (M−Sb₂O₄) in a facile hydrothermal process and further explored the structure effect on reaction kinetics. The exploration results show that the micro-flower mesocrystalline M−Sb₂O₄ consists of oriented nanowires with (110) crystal faces showing large surface area and high porosity. This structure can increase the contact area between electrode and electrolyte, provide fast Na⁺ transfer channels, and shorten the charge transport path, exhibiting excellent alloying reaction kinetics. The excellent reaction kinetics improves rate performance with a capacity of 432 mA h g^-1 at 5 A g^-1. Furthermore, it exhibits a high power density of 1700 W kg⁻¹ in the full cell. Compared to the other reported various structured Sb-based anodes, M−Sb₂O₄ exhibits a great performance advantage. This work demonstrates that the mesocrystalline effect can effectively enhance alloying reaction kinetics, providing a new strategy for performance optimization of other alloy-based anodes.

据报道，介晶材料在提高电化学性能方面具有很大优势。然而，目前还没有关于介晶 Sb2O4 阳极的报道，其在反应动力学中的结构优势也不明确。在这项工作中，我们采用简便的水热法制备了介晶 Sb2O4 结构（M-Sb2O4），并进一步探讨了该结构对反应动力学的影响。研究结果表明，微花介晶 M-Sb2O4 由取向纳米线组成，晶面为（110），具有大表面积和高孔隙率。这种结构可以增加电极与电解液的接触面积，提供快速的 Na+ 传输通道，缩短电荷传输路径，表现出优异的合金化反应动力学。优异的反应动力学提高了速率性能，在 5 A g-1 的条件下，容量可达 432 mA h g-1。此外，它在全电池中还表现出 1700 W kg-1 的高功率密度。与其他已报道的各种结构的锑基阳极相比，M-Sb2O4 具有极大的性能优势。这项研究表明，介晶效应能有效提高合金化反应动力学，为其他合金基阳极的性能优化提供了一种新策略。

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引用次数: 0

One-step synthesis of dendritic nanostructured single crystal NiSe electrocatalyst for hydrogen evolution reaction 一步合成用于氢气进化反应的树枝状纳米结构单晶 NiSe 电催化剂

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2024-10-28 DOI: 10.1016/j.jelechem.2024.118751

Qin Li , Xingqiang Zhou , Haowei Hu , Kun Hu , Hui Liu , Xiaolong Fang

A novel dendritic nanostructure NiSe has been synthesized for electrocatalytic hydrogen evolution reaction (HER) through a hydrothermal method. The micromorphology and microstructure characterizations show that the branches of the dendritic NiSe are epitaxially grown on the trunk, and individual nickel selenide dendrites have three-dimensional structures with four branches in short axes. The nanostructures of each branch are paralleled to each other in the same plane, and are perpendicular to the trunk with the same crystal orientation. The dendritic NiSe catalyst demonstrates highly efficient HER activity with a low overpotential of 191 mV and a small Tafel slope of 47 mV dec⁻¹ in acidic solutions. The remarkable enhancement of the dendritic NiSe in the HER performance can be attributed to its dense dendritic nano-structure, and high specific surface area, which provide effective diffusion channels and much more catalytic sites towards the HER. This achievement provides a new method for producing cheap and efficient dendritic nanostructures catalysts for water splitting.

通过水热法合成了用于电催化氢进化反应（HER）的新型树枝状纳米结构硒化镍。微观形貌和微观结构表征表明，树枝状硒化镍的分支是在主干上外延生长的，单个硒化镍树枝状物具有三维结构，短轴上有四个分支。每个树枝的纳米结构在同一平面内相互平行，并以相同的晶体取向垂直于主干。树枝状 NiSe 催化剂在酸性溶液中具有 191 mV 的低过电位和 47 mV dec-1 的小 Tafel 斜坡，表现出高效的 HER 活性。树枝状 NiSe 的 HER 性能之所以能显著提高，是因为其致密的树枝状纳米结构和高比表面积为 HER 提供了有效的扩散通道和更多的催化位点。这一成果为生产廉价高效的树枝状纳米结构催化剂提供了一种新方法。

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