Pub Date : 2025-10-01Epub Date: 2025-07-18DOI: 10.1016/j.elecom.2025.108006
Yi Zhang , Chen Ji , Xingtian Wang , Bin Qiu , Huaiyu Chen
The development of cost-effective and high-performance electrochemical sensors for uric acid (UA) detection is critical due to its role as a key biomarker in disease diagnosis. This study presents an innovative sensor based on platinum nanoparticle (Pt NPs) decorated graphdiyne (GDY) nanohybrid (denoted as Pt NPs/GDY), fabricated via a facile electroless deposition method. The hybrid material capitalizes on the synergistic effects of GDY's π-electron-rich structure - enhancing target affinity through π-π stacking, and Pt NPs' dual functionality as conductivity boosters and catalytic activators. Electrochemical evaluations revealed that the Pt NPs/GDY-modified glassy carbon electrode (GCE) outperforms conventional GDY/GCE and bare GCE, achieving a broad linear range (0.1–7.5 μM) and an ultralow detection limit (30 nM). The sensor also demonstrated exceptional reproducibility, long-term stability, and selectivity against common interferents, validated by successful UA quantification in human urine samples (92.8–98.5 % recovery).
{"title":"Electrochemical detection of uric acid based on platinum nanoparticles/graphdiyne hybrids","authors":"Yi Zhang , Chen Ji , Xingtian Wang , Bin Qiu , Huaiyu Chen","doi":"10.1016/j.elecom.2025.108006","DOIUrl":"10.1016/j.elecom.2025.108006","url":null,"abstract":"<div><div>The development of cost-effective and high-performance electrochemical sensors for uric acid (UA) detection is critical due to its role as a key biomarker in disease diagnosis. This study presents an innovative sensor based on platinum nanoparticle (Pt NPs) decorated graphdiyne (GDY) nanohybrid (denoted as Pt NPs/GDY), fabricated via a facile electroless deposition method. The hybrid material capitalizes on the synergistic effects of GDY's π-electron-rich structure - enhancing target affinity through π-π stacking, and Pt NPs' dual functionality as conductivity boosters and catalytic activators. Electrochemical evaluations revealed that the Pt NPs/GDY-modified glassy carbon electrode (GCE) outperforms conventional GDY/GCE and bare GCE, achieving a broad linear range (0.1–7.5 μM) and an ultralow detection limit (30 nM). The sensor also demonstrated exceptional reproducibility, long-term stability, and selectivity against common interferents, validated by successful UA quantification in human urine samples (92.8–98.5 % recovery).</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"179 ","pages":"Article 108006"},"PeriodicalIF":4.2,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144764062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study focuses on the high-performance, binder-free electrodes on nickel foam by simple cathodic electrodeposition using nickel chloride, copper sulfate, and thiourea solution as aqueous electrolytes. The CuS, NiS, and NiCuS electrodes synthesized by cathodic electrodeposition were characterized by X-ray diffraction, energy dispersive spectra, and scanning electron microscopy. The electrochemical performance of the synthesized positive electrodes was investigated in aqueous potassium hydroxide electrolyte by widespread electroanalytical techniques such as cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge-discharge. The electrochemical tests revealed that the synthesized electrode materials exhibited significant reversible redox reactions. Among the produced electrodes, CuNiS exhibited high specific capacitance (1026.9 F g−1 at 5 mV s−1; 1338.5 F g−1 at 1 A g−1 current density). The produced NiCuS//activated carbon supercapacitor achieved 890 W kg−1 power and 14.9 Wh kg−1 energy density in the potential range from 0 to 1.40 V. The asymmetric supercapacitor reached 157.8 % of the initial discharge capacity at the end of 5000 charge-discharge cycles. The results of this study indicate that the electrodes produced by the cathodic electrochemical deposition method have excellent potential for use as positive electrodes in supercapacitor applications.
本研究以氯化镍、硫酸铜和硫脲溶液为水溶液，采用简单的阴极电沉积方法在泡沫镍上制备高性能无粘结剂电极。采用x射线衍射、能谱和扫描电镜对阴极电沉积法制备的cu、NiS和NiCuS电极进行了表征。利用循环伏安法、电化学阻抗谱、恒流充放电等广泛应用的电分析技术，研究了合成的正极在氢氧化钾水溶液中的电化学性能。电化学测试表明，合成的电极材料表现出明显的可逆氧化还原反应。在所制备的电极中，CuNiS具有较高的比电容（在5 mV s−1时为1026.9 F g−1）；1338.5 F g−1在1a g−1电流密度)。在0 ~ 1.40 V电势范围内，NiCuS//活性炭超级电容器的功率为890 W kg−1，能量密度为14.9 Wh kg−1。在5000次充放电循环结束时，非对称超级电容器达到初始放电容量的157.8%。研究结果表明，用阴极电化学沉积法制备的电极在超级电容器中具有良好的正极应用潜力。
{"title":"Electrodeposition of CuNiS as battery type electrode for supercapacitor applications","authors":"Davut Uzun, Ahsen Albaş, Seyfullah Madakbaş, Ece Kök Yetimoğlu","doi":"10.1016/j.elecom.2025.108024","DOIUrl":"10.1016/j.elecom.2025.108024","url":null,"abstract":"<div><div>This study focuses on the high-performance, binder-free electrodes on nickel foam by simple cathodic electrodeposition using nickel chloride, copper sulfate, and thiourea solution as aqueous electrolytes. The CuS, NiS, and NiCuS electrodes synthesized by cathodic electrodeposition were characterized by X-ray diffraction, energy dispersive spectra, and scanning electron microscopy. The electrochemical performance of the synthesized positive electrodes was investigated in aqueous potassium hydroxide electrolyte by widespread electroanalytical techniques such as cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge-discharge. The electrochemical tests revealed that the synthesized electrode materials exhibited significant reversible redox reactions. Among the produced electrodes, CuNiS exhibited high specific capacitance (1026.9 F g<sup>−1</sup> at 5 mV s<sup>−1</sup>; 1338.5 F g<sup>−1</sup> at 1 A g<sup>−1</sup> current density). The produced NiCuS//activated carbon supercapacitor achieved 890 W kg<sup>−1</sup> power and 14.9 Wh kg<sup>−1</sup> energy density in the potential range from 0 to 1.40 V. The asymmetric supercapacitor reached 157.8 % of the initial discharge capacity at the end of 5000 charge-discharge cycles. The results of this study indicate that the electrodes produced by the cathodic electrochemical deposition method have excellent potential for use as positive electrodes in supercapacitor applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"179 ","pages":"Article 108024"},"PeriodicalIF":4.2,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144860624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-01Epub Date: 2025-08-12DOI: 10.1016/j.elecom.2025.108025
Jie Zhang , Yuanying Shi , Liming Liu , Bin Qiu , Yue Tian , Guodong Guo
In this work, a novel homogeneous electrochemical (HEC) sensing strategy was developed for carcinoembryonic antigen (CEA) detection, addressing limitations of traditional electrochemical platforms that necessitate complex electrode modifications and receptor immobilization protocols. This approach integrates platinum nanoparticle-loaded UiO-66 metal-organic frameworks (Pt/UiO) as an oxidase-like nanozyme with CEA-specific aptamer (Apt) as recognition element, establishing a target-responsive catalytic mechanism. In solution-phase operation, the Pt/UiO nanozyme facilitates the oxidation of 1,2-diaminobenzene into electroactive diaminophenazine (DAP), generating measurable reduction current at unmodified electrode. Apt adsorption onto Pt/UiO surfaces effectively inhibits this enzymatic activity through steric hindrance, resulting in current suppression proportional to Apt coverage. The presence of CEA induces specific Apt-CEA binding, resulting Apt away from the nanozyme surface and restoring catalytic activity in a concentration-dependent manner. Optimization of experimental parameters (e.g., nanozyme concentration, incubation time) enabled the sensor to achieve a detection limit of 3 pg mL−1 with a linear range spanning 0.01–11 ng mL−1, demonstrating potential for point-of-care applications in tumor biomarker analysis.
在这项工作中，开发了一种用于癌胚抗原（CEA）检测的新型均相电化学（HEC）传感策略，解决了传统电化学平台需要复杂电极修饰和受体固定方案的局限性。该方法将负载铂纳米粒子的UiO-66金属有机框架（Pt/UiO）作为类氧化酶纳米酶，以cea特异性适配体（Apt）作为识别元件，建立靶响应催化机制。在液相操作中，Pt/UiO纳米酶促进1,2-二氨基苯氧化成电活性二氨基苯（DAP），在未修饰的电极上产生可测量的还原电流。Apt在Pt/UiO表面的吸附通过位阻有效地抑制了这种酶的活性，导致电流抑制与Apt覆盖成正比。CEA的存在诱导特异性的Apt-CEA结合，导致Apt远离纳米酶表面，并以浓度依赖的方式恢复催化活性。优化实验参数（例如，纳米酶浓度，孵育时间）使传感器达到3 pg mL - 1的检测限，线性范围为0.01-11 ng mL - 1，显示了在肿瘤生物标志物分析中的即时应用潜力。
{"title":"Homogeneous electrochemical detection of carcinoembryonic antigen based on target-controlled catalytical reaction of platinum/UiO-66 MOFs nanozyme integrated with aptamer","authors":"Jie Zhang , Yuanying Shi , Liming Liu , Bin Qiu , Yue Tian , Guodong Guo","doi":"10.1016/j.elecom.2025.108025","DOIUrl":"10.1016/j.elecom.2025.108025","url":null,"abstract":"<div><div>In this work, a novel homogeneous electrochemical (HEC) sensing strategy was developed for carcinoembryonic antigen (CEA) detection, addressing limitations of traditional electrochemical platforms that necessitate complex electrode modifications and receptor immobilization protocols. This approach integrates platinum nanoparticle-loaded UiO-66 metal-organic frameworks (Pt/UiO) as an oxidase-like nanozyme with CEA-specific aptamer (Apt) as recognition element, establishing a target-responsive catalytic mechanism. In solution-phase operation, the Pt/UiO nanozyme facilitates the oxidation of 1,2-diaminobenzene into electroactive diaminophenazine (DAP), generating measurable reduction current at unmodified electrode. Apt adsorption onto Pt/UiO surfaces effectively inhibits this enzymatic activity through steric hindrance, resulting in current suppression proportional to Apt coverage. The presence of CEA induces specific Apt-CEA binding, resulting Apt away from the nanozyme surface and restoring catalytic activity in a concentration-dependent manner. Optimization of experimental parameters (e.g., nanozyme concentration, incubation time) enabled the sensor to achieve a detection limit of 3 pg mL<sup>−1</sup> with a linear range spanning 0.01–11 ng mL<sup>−1</sup>, demonstrating potential for point-of-care applications in tumor biomarker analysis.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"179 ","pages":"Article 108025"},"PeriodicalIF":4.2,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-01Epub Date: 2025-07-23DOI: 10.1016/j.elecom.2025.108008
Basit Ali Khan , Fengqi Zhou , Tongsheng Zhang , Shams ur Rahman , Attia Sadiq , Farasat Haider , Fazila Shafique , Rafaqat Hussain , Jaweria Khalid
In this study, NiSe2/GO composites were successfully synthesized by using a facile and effective chemical method to increase the catalytic activity and charge transfer efficiency for oxygen evolution reaction (OER). The structural analysis confirmed the successful preparation of NiSe2 and NiSe2-GO (10 %, 25 %) composites. Similarly, the morphology of NiSe2 appeared to be nanocubes, whilst NiSe2-GO (10 %, 25 %) composites revealed features comprising of both NiSe2 nanocubes and GO sheets. The electrochemical performance of NiSe2 and NiSe2-GO (10 %, 25 %) composites was also investigated for enhanced OER. Among the synthesized compositions, NiSe2–25 % GO demonstrated the most superior electrocatalytic performance, which exhibited a significantly lower Tafel slope (66 mV/dec at 10 mV/s). Electrochemical impedance spectroscopy (EIS) analysis further confirmed the high efficiency of NiSe2–25 % GO, where a smallest semicircle in the Nyquist plot was observed. In terms of overpotential, NiSe2–25 % GO achieved a remarkably low value of ∼350 mV, demonstrating superior catalytic efficiency compared to NiSe2–10 % GO (∼500 mV) and pristine NiSe2 (∼600 mV). The significantly reduced overpotential suggested that the NiSe2–25 % GO material required the least energy input to drive the reaction at a given current density. This enhanced performance was attributed to the synergistic effect between NiSe2 and GO, where the GO matrix provided a favorable pathway for electron transfer, while NiSe2 acted as an active catalytic site for OER. These findings highlight NiSe2–25 % GO as a highly effective and promising electrocatalyst for OER applications. Its superior charge transport characteristics, lower overpotential, and faster reaction kinetics make it a strong candidate for next-generation energy conversion and storage technologies.
{"title":"Synthesis and exploration of NiSe2-GO composites as electrocatalysts with high-performance oxygen evolution reaction","authors":"Basit Ali Khan , Fengqi Zhou , Tongsheng Zhang , Shams ur Rahman , Attia Sadiq , Farasat Haider , Fazila Shafique , Rafaqat Hussain , Jaweria Khalid","doi":"10.1016/j.elecom.2025.108008","DOIUrl":"10.1016/j.elecom.2025.108008","url":null,"abstract":"<div><div>In this study, NiSe<sub>2</sub>/GO composites were successfully synthesized by using a facile and effective chemical method to increase the catalytic activity and charge transfer efficiency for oxygen evolution reaction (OER). The structural analysis confirmed the successful preparation of NiSe<sub>2</sub> and NiSe<sub>2</sub>-GO (10 %, 25 %) composites. Similarly, the morphology of NiSe<sub>2</sub> appeared to be nanocubes, whilst NiSe<sub>2</sub>-GO (10 %, 25 %) composites revealed features comprising of both NiSe<sub>2</sub> nanocubes and GO sheets. The electrochemical performance of NiSe<sub>2</sub> and NiSe<sub>2</sub>-GO (10 %, 25 %) composites was also investigated for enhanced OER. Among the synthesized compositions, NiSe<sub>2</sub>–25 % GO demonstrated the most superior electrocatalytic performance, which exhibited a significantly lower Tafel slope (66 mV/dec at 10 mV/s). Electrochemical impedance spectroscopy (EIS) analysis further confirmed the high efficiency of NiSe<sub>2</sub>–25 % GO, where a smallest semicircle in the Nyquist plot was observed. In terms of overpotential, NiSe<sub>2</sub>–25 % GO achieved a remarkably low value of ∼350 mV, demonstrating superior catalytic efficiency compared to NiSe<sub>2</sub>–10 % GO (∼500 mV) and pristine NiSe<sub>2</sub> (∼600 mV). The significantly reduced overpotential suggested that the NiSe<sub>2</sub>–25 % GO material required the least energy input to drive the reaction at a given current density. This enhanced performance was attributed to the synergistic effect between NiSe<sub>2</sub> and GO, where the GO matrix provided a favorable pathway for electron transfer, while NiSe<sub>2</sub> acted as an active catalytic site for OER. These findings highlight NiSe<sub>2</sub>–25 % GO as a highly effective and promising electrocatalyst for OER applications. Its superior charge transport characteristics, lower overpotential, and faster reaction kinetics make it a strong candidate for next-generation energy conversion and storage technologies.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"179 ","pages":"Article 108008"},"PeriodicalIF":4.2,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144722280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The spatial arrangement of biorecognition molecules on the sensor surface plays a critical role in determining the performance of electrochemical biosensors. In this work, we report a covalent and tunable immobilization strategy using aryl diazonium chemistry to functionalize carbon electrodes with ethynyl groups protected by trimethylsilyl (TMS) or triisopropylsilyl (TIPS) moieties. After deprotection, an azide-modified aptamer (APT) specific to diclofenac (DCF) was immobilized via copper-catalyzed azide–alkyne cycloaddition (CuAAC). Although the TMS and TIPS groups differ in size by only 1.7 Å, this small variation significantly influenced APT spacing and sensor performance. The TIPS-based sensor displayed a nearly fourfold increase in signal response compared to the TMS-based counterpart, achieving a limit of detection of 17.95 μM. These results underscore the importance of nanoscale molecular design in optimizing label-free aptasensor sensitivity.
{"title":"Surface organization of aptamers via diazonium grafting: A key parameter in label-free electrochemical sensing","authors":"Teodora Lupoi , Bogdan Feier , Florence Geneste , Cecilia Cristea , Yann R. Leroux","doi":"10.1016/j.elecom.2025.108000","DOIUrl":"10.1016/j.elecom.2025.108000","url":null,"abstract":"<div><div>The spatial arrangement of biorecognition molecules on the sensor surface plays a critical role in determining the performance of electrochemical biosensors. In this work, we report a covalent and tunable immobilization strategy using aryl diazonium chemistry to functionalize carbon electrodes with ethynyl groups protected by trimethylsilyl (TMS) or triisopropylsilyl (TIPS) moieties. After deprotection, an azide-modified aptamer (APT) specific to diclofenac (DCF) was immobilized via copper-catalyzed azide–alkyne cycloaddition (CuAAC). Although the TMS and TIPS groups differ in size by only 1.7 Å, this small variation significantly influenced APT spacing and sensor performance. The TIPS-based sensor displayed a nearly fourfold increase in signal response compared to the TMS-based counterpart, achieving a limit of detection of 17.95 μM. These results underscore the importance of nanoscale molecular design in optimizing label-free aptasensor sensitivity.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 108000"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-07-23DOI: 10.1016/j.elecom.2025.108009
Lin Wang , Hai Yu , YaXin Wang , Chun Miao , QianQian Lei , XinPing Yao , XiaoChen Yao , Xin Wei , JianGuo Lv , Yan Xue , JingWen Zhang , SiWen Zhou , DanDan Qu
This study synthesized p-type Cu2O using an electrodeposition method and firmly attached it to TiO2 nanosheets based on fluorine-doped tin oxide (FTO) substrates, forming a dense film that serves directly as a photoanode for photoelectrochemical (PEC) water splitting. Characterization techniques such as XRD, SEM, XPS, and UV–Vis confirmed the successful deposition of Cu2O on the TiO2 nanosheets, forming a p-n heterojunction structure. The incorporation of Cu2O effectively broadened the light absorption range of TiO2, with a cut-off wavelength red-shifting to 537 nm, enabling it to absorb more visible light. Photoelectrochemical tests showed that under illuminated unbiased conditions, the photocurrent density of Cu2O-TiO2 reached 0.3 mA/cm2, which is 7.5 times that of TiO2. After applying a small bias (0.5 V), the photocurrent density further increased to 2.1 mA/cm2, 5.2 times that under unbiased conditions, indicating that the introduction of electricity effectively accelerated the separation efficiency of photo-generated carriers. The Cu₂O-TiO₂ heterojunction exhibited significantly higher photocurrent density (measured by LSV) and charge transfer efficiency (evaluated by EIS) than pure TiO₂. This research provides new insights for PEC water splitting technology and serves as a reference for designing high-performance photocatalysts.
{"title":"Electrodeposition of p-type Cu2O on n-type TiO2 nanosheet arrays for enhanced photoelectrochemical water splitting","authors":"Lin Wang , Hai Yu , YaXin Wang , Chun Miao , QianQian Lei , XinPing Yao , XiaoChen Yao , Xin Wei , JianGuo Lv , Yan Xue , JingWen Zhang , SiWen Zhou , DanDan Qu","doi":"10.1016/j.elecom.2025.108009","DOIUrl":"10.1016/j.elecom.2025.108009","url":null,"abstract":"<div><div>This study synthesized p-type Cu<sub>2</sub>O using an electrodeposition method and firmly attached it to TiO<sub>2</sub> nanosheets based on fluorine-doped tin oxide (FTO) substrates, forming a dense film that serves directly as a photoanode for photoelectrochemical (PEC) water splitting. Characterization techniques such as XRD, SEM, XPS, and UV–Vis confirmed the successful deposition of Cu<sub>2</sub>O on the TiO<sub>2</sub> nanosheets, forming a p-n heterojunction structure. The incorporation of Cu<sub>2</sub>O effectively broadened the light absorption range of TiO<sub>2</sub>, with a cut-off wavelength red-shifting to 537 nm, enabling it to absorb more visible light. Photoelectrochemical tests showed that under illuminated unbiased conditions, the photocurrent density of Cu<sub>2</sub>O-TiO<sub>2</sub> reached 0.3 mA/cm<sup>2</sup>, which is 7.5 times that of TiO<sub>2</sub>. After applying a small bias (0.5 V), the photocurrent density further increased to 2.1 mA/cm<sup>2</sup>, 5.2 times that under unbiased conditions, indicating that the introduction of electricity effectively accelerated the separation efficiency of photo-generated carriers. The Cu₂O-TiO₂ heterojunction exhibited significantly higher photocurrent density (measured by LSV) and charge transfer efficiency (evaluated by EIS) than pure TiO₂. This research provides new insights for PEC water splitting technology and serves as a reference for designing high-performance photocatalysts.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 108009"},"PeriodicalIF":4.2,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-07-14DOI: 10.1016/j.elecom.2025.107999
Suzhen Bai , Kesheng Cao , Yi Zeng , Zhengshan Tian , Xiangxiang Du , Xingqun Zheng
The theoretical electrocatalytic potential for the urea oxidation reaction (UOR) is notably low at 0.37 V, positioning it as a promising alternative to hydrogen evolution reaction for traditional water electrolysis. In this study, we synthesized NixS6/MnS (NMS) heterojunction catalysts using a straightforward co-precipitation method. Initially, we prepared bimetallic hydroxides precursors (Ni/Mn(OH)2), which were subsequently sulfurized to obtain the NMS heterojunctions. The formation of NMS heterojunctions could enhance charge transfer and improve electrical conductivity, significantly boosting the electrocatalytic UOR activity. The NMS heterojunctions facilitate electrocatalytic UOR at a low anodic potential of 0.7 V vs. Ag/AgCl, achieving a peak current density of 11.8 mA cm−2, with effective electrochemical surface area and Tafel slope values of 6.23 mF cm−2 and 78.3 mV dec−1, respectively. Furthermore, when utilized as an anode for overall urea electrolysis within a dual-electrode system, the NMS heterojunctions obtained a higher current density of 13.2 mA cm−2, double that of pure water electrolysis (6.1 mA cm−2). This work represents a significant advancement in employing nickel-based sulfide heterojunctions for catalyzing urea oxidation reaction.
尿素氧化反应（UOR）的理论电催化电位非常低，为0.37 V，这使其成为传统水电解析氢反应的一个有前景的替代反应。本研究采用共沉淀法合成了NixS6/MnS （NMS）异质结催化剂。首先，我们制备了双金属氢氧化物前体（Ni/Mn(OH)2），随后对其进行硫化以获得NMS异质结。NMS异质结的形成可以促进电荷转移，提高电导率，显著提高电催化UOR活性。NMS异质结在低阳极电位（0.7 V vs. Ag/AgCl）下促进电催化UOR，峰值电流密度为11.8 mA cm−2，有效电化学表面积和Tafel斜率分别为6.23 mF cm−2和78.3 mV dec−1。此外，当在双电极系统中用作尿素电解的阳极时，NMS异质结获得了13.2 mA cm - 2的更高电流密度，是纯水电解（6.1 mA cm - 2）的两倍。本研究在利用镍基硫化物异质结催化尿素氧化反应方面取得了重大进展。
{"title":"Urea electrooxidation coupled with energy-saving H2 production using bimetallic sulfide heterojunctions","authors":"Suzhen Bai , Kesheng Cao , Yi Zeng , Zhengshan Tian , Xiangxiang Du , Xingqun Zheng","doi":"10.1016/j.elecom.2025.107999","DOIUrl":"10.1016/j.elecom.2025.107999","url":null,"abstract":"<div><div>The theoretical electrocatalytic potential for the urea oxidation reaction (UOR) is notably low at 0.37 V, positioning it as a promising alternative to hydrogen evolution reaction for traditional water electrolysis. In this study, we synthesized Ni<sub>x</sub>S<sub>6</sub>/MnS (NMS) heterojunction catalysts using a straightforward co-precipitation method. Initially, we prepared bimetallic hydroxides precursors (Ni/Mn(OH)<sub>2</sub>), which were subsequently sulfurized to obtain the NMS heterojunctions. The formation of NMS heterojunctions could enhance charge transfer and improve electrical conductivity, significantly boosting the electrocatalytic UOR activity. The NMS heterojunctions facilitate electrocatalytic UOR at a low anodic potential of 0.7 V vs. Ag/AgCl, achieving a peak current density of 11.8 mA cm<sup>−2</sup>, with effective electrochemical surface area and Tafel slope values of 6.23 mF cm<sup>−2</sup> and 78.3 mV dec<sup>−1</sup>, respectively. Furthermore, when utilized as an anode for overall urea electrolysis within a dual-electrode system, the NMS heterojunctions obtained a higher current density of 13.2 mA cm<sup>−2</sup>, double that of pure water electrolysis (6.1 mA cm<sup>−2</sup>). This work represents a significant advancement in employing nickel-based sulfide heterojunctions for catalyzing urea oxidation reaction.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107999"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-05-27DOI: 10.1016/j.elecom.2025.107965
Tien-Ching Ma , Andreas Hutzler , Richard Hanke-Rauschenbach , Simon Thiele
The design of the anode catalyst layer (ACL) and its interface to the porous transport layer (PTL) significantly influence cell behavior of proton exchange membrane water electrolysis (PEMWE). To understand the complex interaction between the two layers and its interface on cell performance, modeling approaches are necessary. In this study, we present an efficient single-phase two-dimensional model resolving both in-plane and through-plane directions of the interface and the catalyst layer. It is validated both by experimental tomographic data and polarization curves. We find that the single-phase model describes polarization behavior well at low current densities. For higher current densities deviations can be found. While the model provides quantitative predictions for most cases, the absence of detailed two-phase flow modeling may limit its accuracy at high current densities where liquid-gas interactions become more dominant. For one sample showing larger deviations at higher potentials, we apply a simple two-phase model, which seems to explain the deviations. We apply the model to determine the optimal ACL/PTL interface configurations for ACLs with various electrical conductivities. The model reveals that a tenfold increase in electrical conductivity can result in a doubling of cell current density. By explaining interactions between ACL properties, ACL/PTL design and ACL performance, the model fosters to accelerate future optimization.
{"title":"Anode catalyst layer optimization in polymer electrolyte membrane water electrolysis: Modeling catalyst layer properties and interface effects","authors":"Tien-Ching Ma , Andreas Hutzler , Richard Hanke-Rauschenbach , Simon Thiele","doi":"10.1016/j.elecom.2025.107965","DOIUrl":"10.1016/j.elecom.2025.107965","url":null,"abstract":"<div><div>The design of the anode catalyst layer (ACL) and its interface to the porous transport layer (PTL) significantly influence cell behavior of proton exchange membrane water electrolysis (PEMWE). To understand the complex interaction between the two layers and its interface on cell performance, modeling approaches are necessary. In this study, we present an efficient single-phase two-dimensional model resolving both in-plane and through-plane directions of the interface and the catalyst layer. It is validated both by experimental tomographic data and polarization curves. We find that the single-phase model describes polarization behavior well at low current densities. For higher current densities deviations can be found. While the model provides quantitative predictions for most cases, the absence of detailed two-phase flow modeling may limit its accuracy at high current densities where liquid-gas interactions become more dominant. For one sample showing larger deviations at higher potentials, we apply a simple two-phase model, which seems to explain the deviations. We apply the model to determine the optimal ACL/PTL interface configurations for ACLs with various electrical conductivities. The model reveals that a tenfold increase in electrical conductivity can result in a doubling of cell current density. By explaining interactions between ACL properties, ACL/PTL design and ACL performance, the model fosters to accelerate future optimization.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107965"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144190263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-07-14DOI: 10.1016/j.elecom.2025.107996
Andualem Ejigu , Molla Tefera , Atnafu Guadie
Detecting hazardous heavy metals like lead, cadmium, mercury, and arsenic is a significant global issue because of their high toxicity and environmental durability. While traditional laboratory methods provide accurate results, their high cost, complexity, and slow processing times restrict their practicality for widespread, on-site monitoring. In this regard, electrochemical techniques, especially voltammetry, have become a strong alternative, delivering a great mix of high sensitivity, portability, and affordability.
This review highlights recent advancements in innovative electrode materials, such as graphene-modified electrodes and sensors enhanced with metal nanoparticles, along with advanced stripping techniques like anodic stripping voltammetry (ASV) and square wave voltammetry (SWV). Thanks to these advancements, detection limits have improved significantly, often reaching the parts per billion (ppb) range, while the selectivity for specific metal ions has also been enhanced.
Additionally, the review critically examines methods for analyzing water, soil, and sediment samples, showcasing the promising capabilities of nanocomposite materials that greatly increase sensitivity and stability. It also emphasizes the importance of standardized protocols for reliable comparisons and discusses future research directions, including the development of new nanocomposite materials and the integration of these advanced ‘nanosensors’ into portable devices for real-time environmental monitoring.
{"title":"A review article on: Voltammetric detection of lead, mercury, chromium, and arsenic metal ions from environmental samples","authors":"Andualem Ejigu , Molla Tefera , Atnafu Guadie","doi":"10.1016/j.elecom.2025.107996","DOIUrl":"10.1016/j.elecom.2025.107996","url":null,"abstract":"<div><div>Detecting hazardous heavy metals like lead, cadmium, mercury, and arsenic is a significant global issue because of their high toxicity and environmental durability. While traditional laboratory methods provide accurate results, their high cost, complexity, and slow processing times restrict their practicality for widespread, on-site monitoring. In this regard, electrochemical techniques, especially voltammetry, have become a strong alternative, delivering a great mix of high sensitivity, portability, and affordability.</div><div>This review highlights recent advancements in innovative electrode materials, such as graphene-modified electrodes and sensors enhanced with metal nanoparticles, along with advanced stripping techniques like anodic stripping voltammetry (ASV) and square wave voltammetry (SWV). Thanks to these advancements, detection limits have improved significantly, often reaching the parts per billion (ppb) range, while the selectivity for specific metal ions has also been enhanced.</div><div>Additionally, the review critically examines methods for analyzing water, soil, and sediment samples, showcasing the promising capabilities of nanocomposite materials that greatly increase sensitivity and stability. It also emphasizes the importance of standardized protocols for reliable comparisons and discusses future research directions, including the development of new nanocomposite materials and the integration of these advanced ‘nanosensors’ into portable devices for real-time environmental monitoring.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107996"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-07-19DOI: 10.1016/j.elecom.2025.108001
Young Ji Park , Sang Hyo Jeong , Younki Lee , Tae Wook Kang , Sun Woog Kim
In this study, MnO2 was synthesized via a hydrothermal method using four different oxidizing agents: KMnO4, K2S2O8, KClO3, and (NH4)2S2O8. The KMnO4 precursor led to the formation of aggregated α-MnO₂, while K2S2O8 produced a mixed phase of α- and γ-MnO2. (NH4)2S2O8 promoted the formation of γ-MnO2 at lower temperatures and induced a structural transition to β-MnO2 at elevated temperatures. Among the lithium precursors investigated, LiOH was found to be the most effective in preserving the spherical morphology of LiMn2O4 during synthesis. Electrochemical measurements revealed that the LiMn2O4 sample synthesized from γ-MnO2 exhibited the highest charge capacity of 132.59 mAh∙g−1, while the α-MnO2-based LiMn2O4 demonstrated the best stability. These results indicate that the initial MnO2 phase significantly influences the electrochemical performance of the resulting spinel cathode.
{"title":"Phase- and morphology-controlled MnO2: Its synthesis and influence on the electrochemical performance of spinel LiMn2O4 cathode materials","authors":"Young Ji Park , Sang Hyo Jeong , Younki Lee , Tae Wook Kang , Sun Woog Kim","doi":"10.1016/j.elecom.2025.108001","DOIUrl":"10.1016/j.elecom.2025.108001","url":null,"abstract":"<div><div>In this study, MnO<sub>2</sub> was synthesized via a hydrothermal method using four different oxidizing agents: KMnO<sub>4</sub>, K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>, KClO<sub>3</sub>, and (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub>. The KMnO<sub>4</sub> precursor led to the formation of aggregated α-MnO₂, while K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> produced a mixed phase of α- and γ-MnO<sub>2</sub>. (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> promoted the formation of γ-MnO<sub>2</sub> at lower temperatures and induced a structural transition to β-MnO<sub>2</sub> at elevated temperatures. Among the lithium precursors investigated, LiOH was found to be the most effective in preserving the spherical morphology of LiMn<sub>2</sub>O<sub>4</sub> during synthesis. Electrochemical measurements revealed that the LiMn<sub>2</sub>O<sub>4</sub> sample synthesized from γ-MnO<sub>2</sub> exhibited the highest charge capacity of 132.59 mAh∙g<sup>−1</sup>, while the α-MnO<sub>2</sub>-based LiMn<sub>2</sub>O<sub>4</sub> demonstrated the best stability. These results indicate that the initial MnO<sub>2</sub> phase significantly influences the electrochemical performance of the resulting spinel cathode.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 108001"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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