Journal of Electroanalytical Chemistry最新文献_第3页

Constructing multi-active-site RuP₂/Co₂P/Ni₂P Electrocatalyst for urea assisted H₂ production 构建多活性位点RuP₂/Co₂P/Ni₂P电催化剂用于尿素辅助H₂生产

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-03 DOI: 10.1016/j.jelechem.2026.119907

Haiyi Jiang , Huayang Cai , Lang Gan , Wei Chen , Wei Qiu , Yanjie Ren

The development of electrocatalysts with multiple active sites is crucial for overcoming the sluggish kinetics of the urea oxidation reaction (UOR), a promising alternative to the energy-intensive oxygen evolution reaction (OER). Herein, we report the construction of a trimetallic RuP₂/Co₂P/Ni₂P heterostructure catalyst supported on nickel foam (NF) through a facile co-hydrothermal synthesis followed by phosphidation. This integrated approach enables the precise formation of abundant heterointerfaces and strong electronic interactions among the metal phosphides. Comprehensive experimental characterizations confirm that the incorporation of Ru effectively modulates the electronic structure and shifts the d-band center, thereby optimizing the adsorption energy of key reaction intermediates. The resultant catalyst exhibits remarkable electrocatalytic performance for both OER and UOR. In a 1 M KOH electrolyte with 0.2 M urea, the optimized catalyst achieves a current density of 100 mA cm⁻² at a low potential of 1.363 V (vs. RHE) for UOR, with a small Tafel slope of 105.41 mV dec⁻¹. For HER, the catalyst achieves a low overpotential of 85.6 mV at 10 mA cm⁻² with a Tafel slope of 40.18 mV dec⁻¹, outperforming most reported analogous catalysts. Furthermore, it demonstrates excellent operational stability, maintaining consistent activity over 37 h of continuous operation at 50 mA cm⁻². This work provides a viable strategy for designing efficient multi-metallic phosphide heterostructures, highlighting their potential for energy-saving hydrogen production and urea-rich wastewater treatment.

尿素氧化反应（UOR）是能量密集型析氧反应（OER）的一种有前景的替代反应，开发具有多活性位点的电催化剂对于克服其缓慢的动力学至关重要。本文报道了一种由泡沫镍（NF）支撑的三金属RuP₂/Co₂P/Ni₂P异质结构催化剂的构建。这种集成方法能够在金属磷化物之间精确形成丰富的异质界面和强电子相互作用。综合实验表征证实，Ru的加入有效地调节了电子结构，移动了d带中心，从而优化了关键反应中间体的吸附能。所得催化剂对OER和UOR均表现出优异的电催化性能。在1 M KOH和0.2 M尿素的电解液中，优化后的催化剂在低电位1.363 V （vs. RHE）下的UOR电流密度为100 mA cm−2，Tafel斜率为105.41 mV dec−1。对于HER，该催化剂在10 mA cm−2下的过电位为85.6 mV， Tafel斜率为40.18 mV dec−1，优于大多数报道的类似催化剂。此外，它还表现出优异的运行稳定性，在50 mA cm - 2下连续运行37小时，保持稳定的活性。本研究为设计高效的多金属磷化物异质结构提供了可行的策略，突出了其在节能制氢和富尿素废水处理方面的潜力。

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引用次数: 0

Rapid square wave voltammetry assay for antibiotic susceptibility test using methylene blue as an extracellular electron transfer 使用亚甲基蓝作为细胞外电子转移的抗生素药敏试验的快速方波伏安法

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-08 DOI: 10.1016/j.jelechem.2026.119931

Yuning Zhou , Kexin Zhang , Chun Xu , Yawen He , Fengyang Liu , Ying Xiong , Xinfang Zhang , Jiali Ren

Rapid identification of antibiotic-resistant bacteria is critical for effectively controlling and preventing their spread. Electrochemical methods have proven effective in detecting many targets but are limited because most bacteria cannot directly transfer electrons to inert electrodes without an electron mediator. In this study, we employed methylene blue (MB) as an exogenous electron shuttle between the bacteria and the electrode and proposed a square wave voltammetry (SWV) for distinguishing between antibiotic-sensitive and antibiotic-resistant bacteria. MB is reduced by metabolically active bacteria, diffuses to the electrode, and is re-oxidized, generating a measurable baseline current proportional to the viable cell population. The activity of bacteria is reflected in the SWV peak current signal observed at −0.2 V. The threshold value (75) was defined based on the analysis of five E. coli isolates tested with three antibiotics to identify antibiotic resistance. Additionally, antibiotic susceptibility of bacteria including Pseudomonas aeruginosa, Salmonella typhimurium, Bacillus cereus, and Listeria monocytogenes was successfully determined using the proposed electrochemical method. These results correlate well with those obtained using classical methods. Furthermore, the detection time of this electrochemical method (less than 2.0 h) is significantly faster compared to traditional microbiological methods (more than 48 h). This rapid and accurate identification of antibiotic resistance highlights the potential of our method for developing advanced antibiotic susceptibility tests.

快速鉴定耐药细菌对于有效控制和预防其传播至关重要。电化学方法已被证明在检测许多目标方面是有效的，但由于大多数细菌不能在没有电子介质的情况下直接将电子转移到惰性电极上，因此受到限制。在这项研究中，我们使用亚甲基蓝（MB）作为细菌和电极之间的外源电子穿梭器，并提出了方波伏安法（SWV）来区分抗生素敏感菌和抗生素耐药菌。MB被代谢活跃的细菌减少，扩散到电极，并被重新氧化，产生与活细胞群成比例的可测量的基线电流。细菌的活性反映在−0.2 V时观察到的SWV峰值电流信号中。阈值（75）是根据对5个大肠杆菌分离株进行三种抗生素检测以确定抗生素耐药性的分析确定的。此外，利用该电化学方法成功测定了铜绿假单胞菌、鼠伤寒沙门氏菌、蜡样芽孢杆菌和单核增生李斯特菌等细菌的药敏。这些结果与用经典方法得到的结果吻合得很好。此外，该电化学方法的检测时间（小于2.0 h）明显快于传统微生物方法（大于48 h）。这种快速和准确的抗生素耐药性鉴定突出了我们的方法在开发先进的抗生素敏感性试验方面的潜力。

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引用次数: 0

Process optimization for the preparation of LiFe0.5Mn0.5PO4/C cathode material from low-grade pyrolusite 低品位软锰矿制备LiFe0.5Mn0.5PO4/C正极材料的工艺优化

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-09 DOI: 10.1016/j.jelechem.2026.119890

Zhenghong Zhu , Jinhuan Yao , Zhihong Zhu , Jianwen Yang , Shunhua Xiao , Yanwei Li

The low-cost synthesis of LiFe_0.5Mn_0.5PO₄ is extremely important for its large-scale practical application. In this work, LiFe_0.5Mn_0.5PO₄/C composites were successfully synthesized via a combined coprecipitation and carbothermal reduction method, using the leachate derived from low-grade pyrolusite as both low-cost manganese and iron sources. Key synthesis parameters, including precipitation pH value, lithium source dosage, and glucose content, were systematically optimized. The optimal material was obtained under the following conditions: a precipitation pH of 5, a Li-to-precursor molar ratio of 0.95:1, and glucose added at 30 wt% relative to the total mass of Li₂CO₃ and precursor. As the cathode material for lithium-ion batteries, it delivers a discharge specific capacity of 92.44 mAh g⁻¹ after 100 cycles at 0.2C, and 37.24 mAh g⁻¹ at a high rate of 5C. This work demonstrates a low-cost route for producing LiFe_0.5Mn_0.5PO₄/C composites and proposes a feasible strategy for the high-value utilization of low-grade pyrolusite.

低成本合成LiFe0.5Mn0.5PO4对其大规模实际应用具有极其重要的意义。本文以低品位软锰矿渗滤液为低成本锰铁源，采用共沉淀法和碳热还原法合成LiFe0.5Mn0.5PO4/C复合材料。对沉淀pH值、锂源用量、葡萄糖含量等关键合成参数进行了系统优化。在沉淀pH = 5，锂与前驱体的摩尔比为0.95:1，葡萄糖以相对于Li2CO3和前驱体总质量的30 wt%加入的条件下，获得了最佳材料。作为锂离子电池的正极材料，在0.2C下循环100次后的放电比容量为92.44 mAh g - 1，在5C高倍率下的放电比容量为37.24 mAh g - 1。本研究为低成本制备LiFe0.5Mn0.5PO4/C复合材料提供了一条可行的途径，为低品位软锰矿的高价值利用提供了可行的策略。

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引用次数: 0

Electrochemical performance of Ruddlesden-popper structured cathode material La2NiO4+δ composited with Ce0.85Sm0.15O2-δ electrolyte for solid oxide fuel cells 固体氧化物燃料电池正极材料La2NiO4+δ与Ce0.85Sm0.15O2-δ电解质复合的电化学性能

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI: 10.1016/j.jelechem.2026.119918

Fei Han, Qinan Zhou, Bi Xu, Hongxue Li, Yuanyuan Wang, Haochen Shi

To optimize the thermal matching property between the cathode and the electrolyte of solid oxide fuel cells (SOFCs), a series of La₂NiO_4+δ-xCe_0.85Sm_0.15O_2-δ (LNO-xSDC, x = 0–30 wt%) composites were fabricated. The results show that the chemical compatibility of the composite sample is excellent. EPR and TG analyses reveal that the 20 wt% SDC sample exhibits the highest oxygen vacancy concentration. There is an excess of oxygen, namely interstitial oxygen, in the LNO lattice. Therefore, the oxygen vacancies in LNO are the result of the combined effect of interstitial oxygen release and lattice oxygen release. The oxygen vacancies in SDC originate from the release of lattice oxygen. The combined effect of the two factors resulted in the 20 wt% SDC sample having the highest oxygen vacancy concentration. Additionally, increasing SDC content brings the thermal expansion coefficient (TEC) of cathode closer to that of the electrolyte. And, the LNO-20SDC composite possesses the highest porosity, the largest specific surface area and smallest particle size, which expands the triple-phase boundaries (TPBs) region and provides more active sites for the oxygen reduction reaction (ORR). Therefore, the composite accelerates the process of diffusion of adsorbed oxygen toward TPBs.

为了优化固体氧化物燃料电池（SOFCs）正极与电解质的热匹配性能，制备了La2NiO4+δ-xCe0.85Sm0.15O2-δ (LNO-xSDC, x = 0-30 wt%)复合材料。结果表明，复合样品具有良好的化学相容性。EPR和TG分析表明，20 wt%的SDC样品表现出最高的氧空位浓度。在LNO晶格中存在过量的氧，即间隙氧。因此，LNO中的氧空位是间隙氧释放和晶格氧释放共同作用的结果。SDC中的氧空位来源于晶格氧的释放。这两个因素的综合作用导致了20%的SDC样品具有最高的氧空位浓度。此外，SDC含量的增加使阴极的热膨胀系数（TEC）与电解质的热膨胀系数（TEC）更接近。LNO-20SDC复合材料具有最高的孔隙率、最大的比表面积和最小的粒径，扩展了三相边界（TPBs）区域，为氧还原反应（ORR）提供了更多的活性位点。因此，复合材料加速了吸附氧向TPBs扩散的过程。

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引用次数: 0

Direct growth of nickel selenide nanostructures on nickel foam: A self-supported electrode with superior bifunctional activity for (saline) alkaline water electrolysis 硒化镍纳米结构在泡沫镍上的直接生长：一种具有优越双功能活性的自支撑电极，用于（盐水）碱性电解

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-06 DOI: 10.1016/j.jelechem.2026.119928

Donghyeon Lee , Hossein Fattahimoghaddam , Sejune Jeon , Yong-Wook Jeong , Tae Kyu An , Yong Jin Jeong

A binder-free Ni_0.95Se-based electrode was fabricated via direct hydrothermal growth on nickel foam (NF), leveraging NF as both Ni source and conductive substrate. Comprehensive characterizations confirmed the formation of crystalline Ni_0.95Se nanoassemblies with homogeneous Ni/Se distribution. Electrochemical evaluation in 1 M KOH revealed exceptional bifunctional performance with overpotentials of 215 mV (OER) and 64 mV (HER) at 10 mA cm⁻², Tafel slopes of 63 mV dec⁻¹ (OER) and 88 mV dec⁻¹ (HER), and electrochemical double-layer capacitance of 5.18 mF cm⁻² (vs. 1.89 mF cm⁻² for NF). A two-electrode electrolyzer (Ni_0.95Se/NF || Ni_0.95Se/NF) achieved 10 mA cm⁻² at 1.64 V, maintaining stability over 24 h with no phase degradation or morphological collapse. Further, the performance of the electrode remained robust in saline-alkaline electrolyte. Post-OER analysis showed surface reconstruction of Ni_0.95Se to NiOOH active phase, while HER preserved the Ni_0.95Se phase. This work highlights Ni_0.95Se/NF as a durable, cost-effective alternative to precious-metal catalysts, offering insights into the design of transition metal selenide-based electrodes for scalable (saline) water splitting technologies.

利用泡沫镍（NF）作为Ni源和导电衬底，采用直接水热生长法制备了无粘结剂ni0.95 se基电极。综合表征证实形成了Ni/Se分布均匀的Ni0.95Se纳米晶。电化学评价显示，在1 M KOH条件下，10 mA cm−2下的过电位为215 mV （OER）和64 mV (HER)， Tafel斜率为63 mV dec−1 （OER）和88 mV dec−1 (HER)，电化学双层电容为5.18 mF cm−2 （NF为1.89 mF cm−2）。双电极电解槽（Ni0.95Se/NF || Ni0.95Se/NF）在1.64 V下达到10 mA cm - 2，在24小时内保持稳定，没有相降解或形态崩溃。此外，电极的性能在盐碱电解质中保持稳定。Post-OER分析显示Ni0.95Se表面重构为NiOOH活性相，而HER则保留了Ni0.95Se相。这项工作强调Ni0.95Se/NF是一种耐用、经济的贵金属催化剂替代品，为可扩展（盐水）水分解技术的过渡金属硒基电极的设计提供了见解。

{"title":"Direct growth of nickel selenide nanostructures on nickel foam: A self-supported electrode with superior bifunctional activity for (saline) alkaline water electrolysis","authors":"Donghyeon Lee , Hossein Fattahimoghaddam , Sejune Jeon , Yong-Wook Jeong , Tae Kyu An , Yong Jin Jeong","doi":"10.1016/j.jelechem.2026.119928","DOIUrl":"10.1016/j.jelechem.2026.119928","url":null,"abstract":"<div><div>A binder-free Ni<sub>0.95</sub>Se-based electrode was fabricated via direct hydrothermal growth on nickel foam (NF), leveraging NF as both Ni source and conductive substrate. Comprehensive characterizations confirmed the formation of crystalline Ni<sub>0.95</sub>Se nanoassemblies with homogeneous Ni/Se distribution. Electrochemical evaluation in 1 M KOH revealed exceptional bifunctional performance with overpotentials of 215 mV (OER) and 64 mV (HER) at 10 mA cm<sup>−2</sup>, Tafel slopes of 63 mV dec<sup>−1</sup> (OER) and 88 mV dec<sup>−1</sup> (HER), and electrochemical double-layer capacitance of 5.18 mF cm<sup>−2</sup> (vs. 1.89 mF cm<sup>−2</sup> for NF). A two-electrode electrolyzer (Ni<sub>0.95</sub>Se/NF || Ni<sub>0.95</sub>Se/NF) achieved 10 mA cm<sup>−2</sup> at 1.64 V, maintaining stability over 24 h with no phase degradation or morphological collapse. Further, the performance of the electrode remained robust in saline-alkaline electrolyte. Post-OER analysis showed surface reconstruction of Ni<sub>0.95</sub>Se to NiOOH active phase, while HER preserved the Ni<sub>0.95</sub>Se phase. This work highlights Ni<sub>0.95</sub>Se/NF as a durable, cost-effective alternative to precious-metal catalysts, offering insights into the design of transition metal selenide-based electrodes for scalable (saline) water splitting technologies.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1007 ","pages":"Article 119928"},"PeriodicalIF":4.1,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171863","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

Multi-phase heterostructure of NiCoP/WP/Co2P4O12 for promoted alkaline hydrogen evolution activity NiCoP/WP/Co2P4O12的多相异质结构促进碱性析氢活性

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-09 DOI: 10.1016/j.jelechem.2026.119911

Liangjun Song, Ruiqian Li, Zhengye Yang, Zixian Zhu, Baorui Yuan, Tiancheng Ni, Cancan Chen, Huizhu Yu, Rencheng Jin

Developing economical electrocatalysts for hydrogen evolution in alkaline electrolyte, which holds rapid kinetics and long-term durability, still remains a significant challenge. Herein, an original multi-phase heterostructure of NiCoP/WP/Co₂P₄O₁₂ derived from layered double hydroxide (LDH) was synthesized through hydrothermal reaction followed by phosphation treatment. It possesses a hollow nanoflower morphology and a large specific surface area, thereby leading to the exposure of abundant active sites. More importantly, three crystalline phases and amorphous state are present in the NiCoP/WP/Co₂P₄O₁₂ catalyst, which endows it with remarkable hydrogen evolution reaction (HER) catalytic activity. In particular, the HER performance of NiCoP/WP/Co₂P₄O₁₂ exhibits low overpotentials of 105 and 133 mV at current density of 50 and 100 mA cm⁻² in alkaline electrolyte, respectively, which are lower than that of most reported transition-metal catalysts. Fast reaction kinetics-mediated by NiCoP/WP/Co₂P₄O₁₂ were achieved with the low Tafel slope of 62.5 mV dec⁻¹. Furthermore, the multi-phase heterostructured NiCoP/WP/Co₂P₄O₁₂ shows outstanding stability, as demonstrated by electrochemical cycling tests (10,000 cycles) and a prolonged chronoamperometric test lasting 83 h. This work not only sheds new light on the HER mechanism of heterostructured electrocatalysts, but also paves the way for the rational design of non-precious and earth-rich electrocatalysts with remarkable HER catalytic activity for practical applications.

开发经济的碱性电解液析氢电催化剂，具有快速的动力学和长期的耐用性，仍然是一个重大的挑战。本文通过水热反应合成了由层状双氢氧化物（LDH）衍生的NiCoP/WP/Co2P4O12多相异质结构，并进行了磷酸化处理。它具有中空的纳米花形态和大的比表面积，从而导致丰富的活性位点暴露。更重要的是，NiCoP/WP/Co2P4O12催化剂存在三晶相和非晶态，这使其具有显著的析氢反应（HER）催化活性。在碱性电解液中，NiCoP/WP/Co2P4O12在电流密度为50和100 mA cm−2时的过电位分别为105和133 mV，低于大多数已有报道的过渡金属催化剂。NiCoP/WP/Co2P4O12介导的快速反应动力学达到了62.5 mV / dec−1的低Tafel斜率。此外，多相异质结构NiCoP/WP/Co2P4O12表现出优异的稳定性，电化学循环试验（10,000次循环）和持续83 h的长时培测试结果表明，该工作不仅揭示了异质结构电催化剂的HER机理，也为合理设计具有优异HER催化活性的非贵重和富土电催化剂铺平了道路。

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引用次数: 0

Degradation characteristics of ammonia nitrogen by MnOx modified foam carbon composite particle electrodes MnOx改性泡沫碳复合颗粒电极对氨氮的降解特性

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-03 DOI: 10.1016/j.jelechem.2026.119921

Tianhong Zhou , Lu Lian , Miao Wang , Rui Min , Jianyun Wu , Huijuan Xin , Kai Ma

To address the performance limitations of traditional water treatment technologies under low-electrolyte conditions typical of alpine regions, this study investigates a three-dimensional electrocatalytic approach. We designed and fabricated a composite particle electrode comprising manganese oxide-modified foam carbon (FC@α-MnO₂). By uniformly dispersing Mn species throughout the foam carbon matrix, the material integrates a three-dimensional mesoporous conductive network with highly active Mn³⁺/oxygen vacancy sites. This architecture significantly increases the specific surface area and provides abundant active sites for electrocatalytic oxidation. The synergy between the mixed-valence Mn³⁺ species and oxygen vacancies is identified as the key driver for free-radical generation and subsequent ammonia nitrogen removal. Experimental results indicate that the composite particle electrode achieves near-complete removal of low-concentration ammonia nitrogen (2 mg L⁻¹) within 8 min at a current density of 2.25 mA cm⁻². Furthermore, the material demonstrates superior redox performance and catalytic activity under low-electrolyte conditions, effectively mitigating issues of poor charge-transfer efficiency and catalytic inertia common in high-altitude, cold environments. Consequently, this work provides a novel strategy for developing high-performance, non-noble-metal three-dimensional composite particle electrodes.

为了解决传统水处理技术在高寒地区低电解质条件下的性能限制，本研究研究了一种三维电催化方法。设计并制备了一种由氧化锰-改性泡沫碳（fc @α- mno2）组成的复合颗粒电极。通过在泡沫碳基体中均匀分散Mn，该材料集成了具有高活性Mn3+/氧空位的三维介孔导电网络。这种结构显著增加了比表面积，并为电催化氧化提供了丰富的活性位点。混合价态Mn3+和氧空位之间的协同作用被认为是自由基产生和随后的氨氮去除的关键驱动因素。实验结果表明，复合颗粒电极在2.25 mA cm−2的电流密度下，在8 min内几乎完全去除低浓度氨氮（2 mg L−1）。此外，该材料在低电解质条件下表现出优异的氧化还原性能和催化活性，有效缓解了在高海拔、寒冷环境中常见的低电荷转移效率和催化惯性问题。因此，这项工作为开发高性能、非贵金属三维复合颗粒电极提供了一种新的策略。

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引用次数: 0

In-situ functionalization of carbon nanomaterials with coffee-extract derived chlorogenic acid: Electrocatalytic dopamine oxidation and molecular insight into coffee–dopamine crosstalk 咖啡萃取物衍生的绿原酸原位功能化碳纳米材料：电催化多巴胺氧化和咖啡-多巴胺串扰的分子洞察

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.jelechem.2026.119880

Jayaprakash Meena , K. Santhakumar , Annamalai Senthil Kumar

Natural polyphenols, such as chlorogenic acid (CGA), abundantly present in coffee, function as redox modulators that help stabilize dopamine and mitigate oxidative stress. Although coffee consumption has been associated with a reduced risk of Parkinson's disease, the direct redox interaction between CGA and dopamine remains poorly understood. In this work, we report a one-step electrochemical fabrication of a carbon black–modified glassy carbon electrode functionalized with coffee-derived chlorogenic acid (GCE/CB@Coffee-CGA) using a coffee–pH 7 phosphate buffer extract precursor, enabling direct investigation of CGA–dopamine redox interactions under physiological conditions. Comprehensive characterization using TEM, FESEM, Raman, IR, UV–Vis, HPTLC, UPLC, and SECM analyses confirmed selective anchoring of the redox-active CGA molecular aggregates on the carbon black surface. The modified electrode exhibited good electrochemical and operational stability, maintaining its redox activity over repeated cycling (up to 100 cycles) and prolonged operation, while retaining ∼55% of its redox peak current after 15 days. It enabled controlled dopamine oxidation to dopaquinone and effectively suppressed overoxidation pathways, including polydopamine formation associated with neurotoxic pigment generation. The mediated oxidation process was further extended to amperometric i–t and batch injection analysis modes for selective dopamine detection. The mediated oxidation process enabled sensitive and selective dopamine detection in neutral phosphate buffer, achieving a sensitivity of 2.215 μA μM⁻¹ (amperometry) and 0.215 μA μM⁻¹ (batch injection analysis), with a limit of detection of 302 nM (S/N = 3). These results underscore the biochemical relevance of coffee polyphenols in modulating dopamine redox chemistry and provide a mechanistic insight into their neuroprotective potential in dopaminergic disorders such as Parkinson's disease.

天然多酚，如绿原酸（CGA），大量存在于咖啡中，作为氧化还原调节剂，有助于稳定多巴胺和减轻氧化应激。虽然喝咖啡与帕金森病的风险降低有关，但CGA和多巴胺之间的直接氧化还原相互作用仍然知之甚少。在这项工作中，我们报道了用咖啡- ph 7磷酸盐缓冲液提取物前体一步电化学制备以咖啡衍生绿原酸（GCE/CB@Coffee-CGA）功能化的炭黑修饰玻碳电极，从而可以直接研究生理条件下cga -多巴胺氧化还原相互作用。通过TEM、FESEM、拉曼光谱、IR、UV-Vis、HPTLC、UPLC和SECM分析，综合表征证实了氧化还原活性CGA分子聚集体在炭黑表面的选择性锚定。改性电极表现出良好的电化学和操作稳定性，在重复循环（多达100次循环）和长时间运行中保持其氧化还原活性，在15天后保持其氧化还原峰值电流的约55%。它能够控制多巴胺氧化为多巴醌，并有效抑制过度氧化途径，包括与神经毒性色素生成相关的多多巴胺形成。介导的氧化过程进一步扩展到选择性多巴胺检测的安培i-t和批量注射分析模式。介导的氧化过程使中性磷酸盐缓冲液中多巴胺的检测具有敏感性和选择性，灵敏度为2.215 μA μM−1（安培法）和0.215 μA μM−1（批量注射分析），检出限为302 nM （S/N = 3）。这些结果强调了咖啡多酚在调节多巴胺氧化还原化学中的生化相关性，并为其在多巴胺能疾病（如帕金森病）中的神经保护潜力提供了机制见解。

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引用次数: 0

Correlation of the role of Li-doping in control of O-vacancies and Li-interstitial formations in NiO with electrochemical properties li掺杂对NiO中o空位和li间隙形成的控制作用与电化学性能的关系

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-01-31 DOI: 10.1016/j.jelechem.2026.119883

Poonam Singh , P. Maneesha , Manju Kumari , Abdelkrim Mekki , Khalil Harrabi , Somaditya Sen

Monovalent doping in a divalent cationic oxide material like NiO introduces modifications in the cationic valence state of the lattice and differences in the ionic radii of the cationic site. Such modifications introduce changes in the oxygen lattice and can introduce interstitial cationic sites, thereby increasing the strain and disorder in the lattice and modifying the bond lengths, leading to changes in the electronic, transport, and capacitive properties, which results in modifications in the charge storage properties. Monovalent Li⁺ doping in NiO is commonly noticed in literature. However, an attempt to correlate the defect formation and associated changes in structural, vibrational, and electronic properties and thereby correlate these to the charge storage properties has not been made. In a first-of-its-kind report, this work reveals that the charge storage properties improve until 3% Li⁺ substitution and thereafter decrease for 6%. The defect study of these materials hints at Li-interstitial being the responsible factor behind such degradation. The connection of oxygen defects, and Ni²⁺ to Ni³⁺ transformation seems to increase the charge storage.

在像NiO这样的二价阳离子氧化物材料中，一价掺杂引入了晶格的阳离子价态的修饰和阳离子位置的离子半径的差异。这种修饰引入了氧晶格的变化，并可以引入间隙阳离子位，从而增加了晶格中的应变和无序性，改变了键长，导致电子、输运和电容性质的变化，从而导致电荷存储性质的改变。一价Li+在NiO中掺杂是文献中普遍关注的问题。然而，还没有尝试将缺陷的形成与结构、振动和电子特性的相关变化联系起来，从而将这些变化与电荷存储特性联系起来。在一份同类报告中，这项工作揭示了电荷存储性能在Li+取代3%之前得到改善，此后下降6%。对这些材料的缺陷研究表明，锂间质是导致这种降解的主要因素。氧缺陷的连接，以及Ni2+向Ni3+的转变似乎增加了电荷的储存。

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引用次数: 0

Low-temperature-derived carbon framework anchoring MoS2 nanosheets as high-performance anode for sodium-ion batteries 低温衍生碳骨架锚定二硫化钼纳米片作为钠离子电池的高性能阳极

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-07 DOI: 10.1016/j.jelechem.2026.119937

Yanying Lin , Zenghua Zhao , Jianhua Qian , Chunyang Duan

Sodium-ion batteries (SIBs) have garnered significant attention for large-scale energy storage applications owing to abundant sodium resources and low cost. High-temperature hard carbons suffer from high energy consumption, while low-temperature (500–800 °C) carbons lack sufficient capacity and cycling stability. To surmount these limitations, this work proposes a strategy of compositing high theoretical capacity molybdenum disulfide (MoS₂) with low-temperature-derived carbon (prepared via the carbonization of biomass bamboo powder at 600 °C) to synergistically enhance sodium storage performance. A small quantity of MoS₂ nanosheets were in situ grown on its surface through a high-pressure ultrasonic hydrothermal method, constructing a low-temperature carbon-based nanocomposite. Structural characterization demonstrates that the low-temperature carbon possesses abundant defect structures and amorphous characteristics, providing a substrate for the uniform dispersion of MoS₂ nanosheets. Meanwhile, the formation of CS bonds may contribute to interfacial bonding, thereby helping to mitigate the volume expansion and aggregation of MoS₂. Electrochemically, the optimal composite (74.7% carbon content) retains 308 mAh g⁻¹ after 100 cycles at 50 mA g⁻¹ (98.9% retention) and exhibits a slope-region capacity contribution increasing from 64.9% to 84.8% via self-activation. This work demonstrates improved balance between capacity and stability through low-energy synergistic engineering, providing a promising approach for low-cost, high-performance SIB anodes.

钠离子电池由于其丰富的钠资源和低廉的成本，在大规模储能应用中受到了广泛的关注。高温硬质碳能耗高，低温（500-800℃）碳容量不足，循环稳定性差。为了克服这些限制，本研究提出了一种将高理论容量的二硫化钼（MoS2）与低温衍生碳（通过在600°C下生物质竹粉碳化制备）复合的策略，以协同提高钠储存性能。采用高压超声水热法在其表面原位生长少量二硫化钼纳米片，构建低温碳基纳米复合材料。结构表征表明，低温碳具有丰富的缺陷结构和非晶态特征，为二硫化钼纳米片的均匀分散提供了衬底。同时，CS键的形成可能有助于界面成键，从而有助于减缓MoS2的体积膨胀和聚集。电化学性能表明，在50 mA g - 1下循环100次后，最佳复合材料（碳含量为74.7%）仍能保持308 mAh g - 1（保留率为98.9%），并且通过自激活，坡区容量贡献从64.9%增加到84.8%。这项工作表明，通过低能量协同工程改善了容量和稳定性之间的平衡，为低成本、高性能SIB阳极提供了一种有前途的方法。

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