Journal of Electroanalytical Chemistry最新文献

英文中文

Synthesis of porphyrin-based metal-organic framework and biomass-derived carbon composite for electrochemical detection of Rutin

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-03-04 DOI: 10.1016/j.jelechem.2025.119058

Chang Liu , Hong-Yu Du , Chen Xin , Xin Di

The quantitative analysis of rutin in pharmaceuticals is crucial for drug quality control. Therefore, designing and synthesizing high-performance electrochemical sensing materials is essential for the accurate and rapid determination of rutin via electrochemical methods. In this study, we propose a facile one-step synthesis reaction strategy to prepare a novel and efficient electrode modification material, composed of a porphyrin-based MOF and biomass-derived carbon. Cinnamon residue from traditional Chinese medicine is identified as a promising candidate for preparing biochar materials. Notably, the incorporating of activating agents significantly enhances the formation of activated cinnamon residue carbon (ARC) with a specific pore structure. Through a one-step solvothermal method, a Zr-based porphyrin MOF (PCN-224) was embedded into the ARC matrix to obtain the composite (PCN-224@ARC). This composite was then used to modify a glassy carbon electrode (GCE) to construct an electrochemical sensor for rutin. The sensor exhibited excellent electrocatalytic performance, with a detection limit as low as 11.7 nM, a wide linear range of 0.05–1 μM and 1–40 μM, and an excellent repeatability and stability. Importantly, the accuracy of the prepared sensor was validated through a t-Test comparison of results obtained using HPLC and the established electrochemical method. The PCN-224@ARC composite inherits the electrocatalytic properties of PCN-224, while maintaining the excellent enrichment capacity and high conductivity of ARC, enabling effective rutin detection. This work not only expands the potential application of PCN-224@ARC composites in the field of flavonoid drug sensing, but also increases the utilization value of cinnamon residue from traditional Chinese medicine.

{"title":"Synthesis of porphyrin-based metal-organic framework and biomass-derived carbon composite for electrochemical detection of Rutin","authors":"Chang Liu , Hong-Yu Du , Chen Xin , Xin Di","doi":"10.1016/j.jelechem.2025.119058","DOIUrl":"10.1016/j.jelechem.2025.119058","url":null,"abstract":"<div><div>The quantitative analysis of rutin in pharmaceuticals is crucial for drug quality control. Therefore, designing and synthesizing high-performance electrochemical sensing materials is essential for the accurate and rapid determination of rutin via electrochemical methods. In this study, we propose a facile one-step synthesis reaction strategy to prepare a novel and efficient electrode modification material, composed of a porphyrin-based MOF and biomass-derived carbon. Cinnamon residue from traditional Chinese medicine is identified as a promising candidate for preparing biochar materials. Notably, the incorporating of activating agents significantly enhances the formation of activated cinnamon residue carbon (ARC) with a specific pore structure. Through a one-step solvothermal method, a Zr-based porphyrin MOF (PCN-224) was embedded into the ARC matrix to obtain the composite (PCN-224@ARC). This composite was then used to modify a glassy carbon electrode (GCE) to construct an electrochemical sensor for rutin. The sensor exhibited excellent electrocatalytic performance, with a detection limit as low as 11.7 nM, a wide linear range of 0.05–1 μM and 1–40 μM, and an excellent repeatability and stability. Importantly, the accuracy of the prepared sensor was validated through a <em>t</em>-Test comparison of results obtained using HPLC and the established electrochemical method. The PCN-224@ARC composite inherits the electrocatalytic properties of PCN-224, while maintaining the excellent enrichment capacity and high conductivity of ARC, enabling effective rutin detection. This work not only expands the potential application of PCN-224@ARC composites in the field of flavonoid drug sensing, but also increases the utilization value of cinnamon residue from traditional Chinese medicine.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119058"},"PeriodicalIF":4.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563289","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

Promoting cross-linking reactivity of coal molecules via swelling strategy to realize high performance coal-derived hard carbon anode

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-03-04 DOI: 10.1016/j.jelechem.2025.119060

JianZhang Niu , JiaYao Cheng , ZongLin Yi , ChangJun Wang , XiaoMing Li , JingPeng Chen , LiJing Xie , YongGang Chang , XiuChun Li , FangYuan Su , ChengMeng Chen

Cross-linking of coal is an effective method for the preparation of modified coal-derived hard carbon (HCs). However, the complex molecular structure and the lower reactivity of coal hinder its cross-linking, which is not beneficial to the preparation of high-performance coal-derived hard carbon. Herein, a swelling strategy is proposed to improve the reactivity of coal molecules with their cross-linking mechanisms with sucroce. It is found that swelling destroys the hydrogen bonding network in coal molecules, producing aliphatic structures and carboxyl functional groups. Therefore, it improves coal molecular reactivity which is conducive to the formation of an abundant C=O/O=C–O three-dimensional structure and a stable cross-linking structure during the high temperature carbonization procedure. The swelling treatment further enlarges the layer spacing of the carbon material, leading to a greater disorder in the carbon structure, and facilitates the development of pore structure. The HCs with optimal structure exhibit a high initial coulombic efficiency of 88.4 %, a reversible capacity of 304.7 mAh g⁻¹, and a excellent rate performance (192 mAh g⁻¹ at 1 A g⁻¹). This work provides a molecular structure modulation strategy for the modification of coal-derived HCs with potential application in advanced sodium ion batteries.

{"title":"Promoting cross-linking reactivity of coal molecules via swelling strategy to realize high performance coal-derived hard carbon anode","authors":"JianZhang Niu , JiaYao Cheng , ZongLin Yi , ChangJun Wang , XiaoMing Li , JingPeng Chen , LiJing Xie , YongGang Chang , XiuChun Li , FangYuan Su , ChengMeng Chen","doi":"10.1016/j.jelechem.2025.119060","DOIUrl":"10.1016/j.jelechem.2025.119060","url":null,"abstract":"<div><div>Cross-linking of coal is an effective method for the preparation of modified coal-derived hard carbon (HCs). However, the complex molecular structure and the lower reactivity of coal hinder its cross-linking, which is not beneficial to the preparation of high-performance coal-derived hard carbon. Herein, a swelling strategy is proposed to improve the reactivity of coal molecules with their cross-linking mechanisms with sucroce. It is found that swelling destroys the hydrogen bonding network in coal molecules, producing aliphatic structures and carboxyl functional groups. Therefore, it improves coal molecular reactivity which is conducive to the formation of an abundant C=O/O=C–O three-dimensional structure and a stable cross-linking structure during the high temperature carbonization procedure. The swelling treatment further enlarges the layer spacing of the carbon material, leading to a greater disorder in the carbon structure, and facilitates the development of pore structure. The HCs with optimal structure exhibit a high initial coulombic efficiency of 88.4 %, a reversible capacity of 304.7 mAh g<sup>−1</sup>, and a excellent rate performance (192 mAh g<sup>−1</sup> at 1 A g<sup>−1</sup>). This work provides a molecular structure modulation strategy for the modification of coal-derived HCs with potential application in advanced sodium ion batteries.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119060"},"PeriodicalIF":4.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611048","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

RuNi nanoparticles encased within a carbon layer for the enhancement of alkaline hydrogen oxidation reaction

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-03-04 DOI: 10.1016/j.jelechem.2025.119065

Mengling Liu , Qiuping Zhao , Lei Wang , Luyun Chen , Na Shang , Xueliang Wang , Haibin Wang , Chunlei Li , Junying Tian

Strong binding affinity for H, CO, and oxygen-containing species of Ru often hinder its electrocatalytic efficiency in hydrogen oxidation reaction (HOR) within alkaline exchange membrane fuel cells (AEMFCs). To address this, a RuNi alloy encased within a carbon shell (Ru_0.55Ni_0.45@C) is prepared through interchain cross-linking, freeze-drying and carbonization processes. The Ru_0.55Ni_0.45@C electrcatalyst demonstrates remarkable HOR activity of 526 A g_Ru⁻¹, surpassing the Pt/C by 2.0 times. Most notably, the electrocatalyst exhibits high tolerance CO. Experimental data indicate that electron transfer from Ni and carbon layer to Ru leads to a decrease in the d-band center of Ru, which in turn reduces both the H and CO binding energy. Additionally, the Ru_0.55Ni_0.45@C electrocatalyst shows an unusual surge in activity at potentials exceeding 0.375 V vs. RHE. Quasi in situ X-ray photoelectron spectroscopy (XPS) analysis reveals this surge in activity is due to electron enrichment of the Ru component.

{"title":"RuNi nanoparticles encased within a carbon layer for the enhancement of alkaline hydrogen oxidation reaction","authors":"Mengling Liu , Qiuping Zhao , Lei Wang , Luyun Chen , Na Shang , Xueliang Wang , Haibin Wang , Chunlei Li , Junying Tian","doi":"10.1016/j.jelechem.2025.119065","DOIUrl":"10.1016/j.jelechem.2025.119065","url":null,"abstract":"<div><div>Strong binding affinity for H, CO, and oxygen-containing species of Ru often hinder its electrocatalytic efficiency in hydrogen oxidation reaction (HOR) within alkaline exchange membrane fuel cells (AEMFCs). To address this, a RuNi alloy encased within a carbon shell (Ru<sub>0.55</sub>Ni<sub>0.45</sub>@C) is prepared through interchain cross-linking, freeze-drying and carbonization processes. The Ru<sub>0.55</sub>Ni<sub>0.45</sub>@C electrcatalyst demonstrates remarkable HOR activity of 526 A g<sub>Ru</sub><sup>−1</sup>, surpassing the Pt/C by 2.0 times. Most notably, the electrocatalyst exhibits high tolerance CO. Experimental data indicate that electron transfer from Ni and carbon layer to Ru leads to a decrease in the d-band center of Ru, which in turn reduces both the H and CO binding energy. Additionally, the Ru<sub>0.55</sub>Ni<sub>0.45</sub>@C electrocatalyst shows an unusual surge in activity at potentials exceeding 0.375 V vs. RHE. Quasi in situ X-ray photoelectron spectroscopy (XPS) analysis reveals this surge in activity is due to electron enrichment of the Ru component.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119065"},"PeriodicalIF":4.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563288","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

Enhanced methyl orange degradation by natural manganese sand-catalyzed in-situ electro-generated active chlorine

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-03-04 DOI: 10.1016/j.jelechem.2025.119059

Asim Khan , Xinwan Zhang , Kun Wang , Waqas Ahmed , Sajid Ullah , Muhammad Umair Mushtaq , Huawei Hu , Zhihao Lu , Daqing Jia , Lehua Zhang

The application of electro-oxidation (EO) technology in organic dyes is restricted by the drawbacks, such as the expensive electrode materials, high energy consumption, and narrow pH applied range. Herein, a natural manganese sand (NMS)-catalyzed in situ electro-generated active chlorine (e.g., HClO) system was proposed to remove methyl orange (MO). The results show that MO can be efficiently removed by the NMS/EO system over a wide pH range (pH 3–12). Radicals (e.g., HO^•, Cl^•) and non-radical active species (e.g., ¹O₂, Mn⁴⁺) are involved in the removal of MO by the NMS/EO system. The effects of important parameters, including the initial solution pH, NMS dosage, current density, electrolyte type, and electrode space, on MO degradation by the NMS/EO system were investigated. The kinetic model of MO removal confirmed that the degradation rate of MO was mainly affected by the dosage of NMS compared with the NaCl concentration. Moreover, the NMS/EO system exhibited a significant reduction in energy consumption for MO removal. This work provides new insights into the degradation of organic dyes by NMS-catalyzed in situ electrogenerated active chlorine.

{"title":"Enhanced methyl orange degradation by natural manganese sand-catalyzed in-situ electro-generated active chlorine","authors":"Asim Khan , Xinwan Zhang , Kun Wang , Waqas Ahmed , Sajid Ullah , Muhammad Umair Mushtaq , Huawei Hu , Zhihao Lu , Daqing Jia , Lehua Zhang","doi":"10.1016/j.jelechem.2025.119059","DOIUrl":"10.1016/j.jelechem.2025.119059","url":null,"abstract":"<div><div>The application of electro-oxidation (EO) technology in organic dyes is restricted by the drawbacks, such as the expensive electrode materials, high energy consumption, and narrow pH applied range. Herein, a natural manganese sand (NMS)-catalyzed in situ electro-generated active chlorine (e.g., HClO) system was proposed to remove methyl orange (MO). The results show that MO can be efficiently removed by the NMS/EO system over a wide pH range (pH 3–12). Radicals (e.g., HO<sup>•</sup>, Cl<sup>•</sup>) and non-radical active species (e.g., <sup>1</sup>O<sub>2</sub>, Mn<sup>4+</sup>) are involved in the removal of MO by the NMS/EO system. The effects of important parameters, including the initial solution pH, NMS dosage, current density, electrolyte type, and electrode space, on MO degradation by the NMS/EO system were investigated. The kinetic model of MO removal confirmed that the degradation rate of MO was mainly affected by the dosage of NMS compared with the NaCl concentration. Moreover, the NMS/EO system exhibited a significant reduction in energy consumption for MO removal. This work provides new insights into the degradation of organic dyes by NMS-catalyzed in situ electrogenerated active chlorine.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119059"},"PeriodicalIF":4.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563290","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

Highly sensitive non-invasive glucose sensing based on chitosan-coated MXene/NiCo-LDH composites

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-03-04 DOI: 10.1016/j.jelechem.2025.119064

Jingwen Yin , Hongteng Zhang , Yue Wang , Yasushi Hasebe , Yan Dong , Zhiqiang Zhang

A highly sensitive non-invasive electrochemical glucose sensor was fabricated using MXene and nickel cobalt layered double hydroxide (NiCo-LDH), followed by the coating of chitosan (CS). MXene layers provide extensive conductive pathways and high surface area for effective glucose adsorption and electron transfer. The incorporation of NiCo-LDH enhances specific catalytic efficiency, significantly boosting the selectivity and sensitivity of the glucose sensor. Chitosan contributes to the structural stability and biocompatibility of the composite, enhancing sensor performance in complex biological matrices such as saliva. By leveraging the synergistic effects of MXene, NiCo-LDH, and chitosan, the sensor possesses significant progresses on sensitivity, selectivity, and stability. The sensor achieves high sensitivity (154.05 μA mM⁻¹ cm⁻²), wide linear detection range (1 μM to 3.998 mM), and low detection limit of 0.21 μM (S/N = 3, RSD = 2.4 %), making it a promising tool for diabetes management and non-invasive health monitoring.

{"title":"Highly sensitive non-invasive glucose sensing based on chitosan-coated MXene/NiCo-LDH composites","authors":"Jingwen Yin , Hongteng Zhang , Yue Wang , Yasushi Hasebe , Yan Dong , Zhiqiang Zhang","doi":"10.1016/j.jelechem.2025.119064","DOIUrl":"10.1016/j.jelechem.2025.119064","url":null,"abstract":"<div><div>A highly sensitive non-invasive electrochemical glucose sensor was fabricated using MXene and nickel cobalt layered double hydroxide (NiCo-LDH), followed by the coating of chitosan (CS). MXene layers provide extensive conductive pathways and high surface area for effective glucose adsorption and electron transfer. The incorporation of NiCo-LDH enhances specific catalytic efficiency, significantly boosting the selectivity and sensitivity of the glucose sensor. Chitosan contributes to the structural stability and biocompatibility of the composite, enhancing sensor performance in complex biological matrices such as saliva. By leveraging the synergistic effects of MXene, NiCo-LDH, and chitosan, the sensor possesses significant progresses on sensitivity, selectivity, and stability. The sensor achieves high sensitivity (154.05 μA mM<sup>−1</sup> cm<sup>−2</sup>), wide linear detection range (1 μM to 3.998 mM), and low detection limit of 0.21 μM (S/N = 3, RSD = 2.4 %), making it a promising tool for diabetes management and non-invasive health monitoring.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119064"},"PeriodicalIF":4.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578861","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

Surface structure optimization by selective dissolution to improve the oxygen reduction performance of SmMn2O5

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-28 DOI: 10.1016/j.jelechem.2025.119052

Shao-Hui Huang , Jie Wu , Jing Chi , Tai-Shen Yang , Jin-Chao Cao

Selective dissolution is an effective strategy to improve the catalytic performance. This method was used to regulate the surface structure of SmMn₂O₅ through HNO₃ acidification to promote its oxygen reduction reaction (ORR) performance. The relationship between the structures and ORR performances of SmMn₂O₅ acidified by different concentrations of HNO₃ (5-8 M) was investigated. HNO₃ can selectively dissolve part of Sm, which reduces Sm/Mn ratio, and increases Mn⁴⁺/Mn³⁺ and surface adsorbed oxygen/lattice oxygen ratios on the catalyst surface. Especially, the increase of Mn⁴⁺ content optimizes the adsorption of oxygen-containing intermediates on Mn³⁺ active sites and enhances the ORR activity. When treated with 7 M HNO₃ for 10 h, the acidified SmMn₂O₅ surface has suitable Mn⁴⁺/Mn³⁺ ratio, exhibiting excellent ORR performance. Compared with SmMn₂O₅, the half-wave potential of the acidified SmMn₂O₅ increases from 0.80 V to 0.83 V, and the diffusion-limited current density improves from 3.44 mA·cm⁻² to 4.76 mA·cm⁻². Additionally, the synergistic catalytic mechanism of Mn⁴⁺ with Mn³⁺ active sites was well discussed.

{"title":"Surface structure optimization by selective dissolution to improve the oxygen reduction performance of SmMn2O5","authors":"Shao-Hui Huang , Jie Wu , Jing Chi , Tai-Shen Yang , Jin-Chao Cao","doi":"10.1016/j.jelechem.2025.119052","DOIUrl":"10.1016/j.jelechem.2025.119052","url":null,"abstract":"<div><div>Selective dissolution is an effective strategy to improve the catalytic performance. This method was used to regulate the surface structure of SmMn<sub>2</sub>O<sub>5</sub> through HNO<sub>3</sub> acidification to promote its oxygen reduction reaction (ORR) performance. The relationship between the structures and ORR performances of SmMn<sub>2</sub>O<sub>5</sub> acidified by different concentrations of HNO<sub>3</sub> (5-8 M) was investigated. HNO<sub>3</sub> can selectively dissolve part of Sm, which reduces Sm/Mn ratio, and increases Mn<sup>4+</sup>/Mn<sup>3+</sup> and surface adsorbed oxygen/lattice oxygen ratios on the catalyst surface. Especially, the increase of Mn<sup>4+</sup> content optimizes the adsorption of oxygen-containing intermediates on Mn<sup>3+</sup> active sites and enhances the ORR activity. When treated with 7 M HNO<sub>3</sub> for 10 h, the acidified SmMn<sub>2</sub>O<sub>5</sub> surface has suitable Mn<sup>4+</sup>/Mn<sup>3+</sup> ratio, exhibiting excellent ORR performance. Compared with SmMn<sub>2</sub>O<sub>5</sub>, the half-wave potential of the acidified SmMn<sub>2</sub>O<sub>5</sub> increases from 0.80 V to 0.83 V, and the diffusion-limited current density improves from 3.44 mA·cm<sup>−2</sup> to 4.76 mA·cm<sup>−2</sup>. Additionally, the synergistic catalytic mechanism of Mn<sup>4+</sup> with Mn<sup>3+</sup> active sites was well discussed.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119052"},"PeriodicalIF":4.1,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552515","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

Effective electrocatalytic overall water splitting over a pearl chain-like NiCoP/CNT hybrid sponge electrode in basic solution

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-27 DOI: 10.1016/j.jelechem.2025.119034

Shuying Wang , Liuen Wang , Yang Lu , Yingjiu Zhang

The electrocatalytic splitting of water into H₂ and O₂ is a potential method for continuous and controllable production of clean energy. Herein, we developed a pearl chain-like nickel cobalt phosphide (NiCoP) nanoparticle-modified 3D CNT sponge electrode by a simple electrodeposition method. The NiCoP/CNT hybrid electrode was found to exhibit excellent electrocatalytic performance for HER and OER in the alkaline solution (1 M KOH). In particular, the NiCoP/CNT hybrid electrodes generated 10 and 100 mA cm⁻² cathodic currents at overpotentials of 73 mV, and 140 mV, respectively. Meanwhile, the NiCoP/CNT compounds generated anodic currents of 10 and 100 mA cm⁻² at overpotentials of 288 and 353 mV, respectively. More specifically, no significant degradation was observed after a 100 h stability test with connecting the NiCoP/CNTs (+) and NiCoP/CNTs (−) in two-electrode system for water splitting under KOH solution. This work demonstrated that bifunctional transition metal electrocatalyst would be a wonderful catalyst for overall water splitting in basic aqueous solution.

{"title":"Effective electrocatalytic overall water splitting over a pearl chain-like NiCoP/CNT hybrid sponge electrode in basic solution","authors":"Shuying Wang , Liuen Wang , Yang Lu , Yingjiu Zhang","doi":"10.1016/j.jelechem.2025.119034","DOIUrl":"10.1016/j.jelechem.2025.119034","url":null,"abstract":"<div><div>The electrocatalytic splitting of water into H<sub>2</sub> and O<sub>2</sub> is a potential method for continuous and controllable production of clean energy. Herein, we developed a pearl chain-like nickel cobalt phosphide (NiCoP) nanoparticle-modified 3D CNT sponge electrode by a simple electrodeposition method. The NiCoP/CNT hybrid electrode was found to exhibit excellent electrocatalytic performance for HER and OER in the alkaline solution (1 M KOH). In particular, the NiCoP/CNT hybrid electrodes generated 10 and 100 mA cm<sup>−2</sup> cathodic currents at overpotentials of 73 mV, and 140 mV, respectively. Meanwhile, the NiCoP/CNT compounds generated anodic currents of 10 and 100 mA cm<sup>−2</sup> at overpotentials of 288 and 353 mV, respectively. More specifically, no significant degradation was observed after a 100 h stability test with connecting the NiCoP/CNTs (+) and NiCoP/CNTs (−) in two-electrode system for water splitting under KOH solution. This work demonstrated that bifunctional transition metal electrocatalyst would be a wonderful catalyst for overall water splitting in basic aqueous solution.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"984 ","pages":"Article 119034"},"PeriodicalIF":4.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552420","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

Comparative experimental and DFT study of the electrochemical oxidation of azo pyridone dyes 偶氮吡啶酮染料电化学氧化的实验和 DFT 比较研究

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-26 DOI: 10.1016/j.jelechem.2025.119043

Aleksandra Mašulović , Jelena Lađarević , Jelena Lović , Vesna Vitnik , Željko Vitnik , Milka Avramov Ivić , Dušan Mijin

This study examines electrooxidation behavior of three aryl azo pyridone using cyclic (CV) and square-wave voltammetry (SWV) on a glassy carbon electrode (GC) in Britton–Robinson (BR) aqueous buffer solutions and quantum-chemical calculations. Results indicate that the electrochemical activity is closely related to the presence of the hydrazone (–NH–N=) bridge of the dyes. The most stable protonated and deprotonated forms of dyes are identified by comparing experimental UV–Vis spectra with calculated spectra. Additionally, calculated ionization energies for both forms aligned with observed electrochemical activity, emphasizing the deprotonated anionic form as the most active. The proposed electrooxidation mechanism suggests that initial step involves dye deprotonation to achieve the most stable anionic form, followed by electron removal to generate a radical, and subsequent geometric adjustments to optimize electron density distribution and stability. The differences of the electrochemical behavior of dyes are discussed with consideration of underlying mechanism.

{"title":"Comparative experimental and DFT study of the electrochemical oxidation of azo pyridone dyes","authors":"Aleksandra Mašulović , Jelena Lađarević , Jelena Lović , Vesna Vitnik , Željko Vitnik , Milka Avramov Ivić , Dušan Mijin","doi":"10.1016/j.jelechem.2025.119043","DOIUrl":"10.1016/j.jelechem.2025.119043","url":null,"abstract":"<div><div>This study examines electrooxidation behavior of three aryl azo pyridone using cyclic (CV) and square-wave voltammetry (SWV) on a glassy carbon electrode (GC) in Britton–Robinson (BR) aqueous buffer solutions and quantum-chemical calculations. Results indicate that the electrochemical activity is closely related to the presence of the hydrazone (–NH–N=) bridge of the dyes. The most stable protonated and deprotonated forms of dyes are identified by comparing experimental UV–Vis spectra with calculated spectra. Additionally, calculated ionization energies for both forms aligned with observed electrochemical activity, emphasizing the deprotonated anionic form as the most active. The proposed electrooxidation mechanism suggests that initial step involves dye deprotonation to achieve the most stable anionic form, followed by electron removal to generate a radical, and subsequent geometric adjustments to optimize electron density distribution and stability. The differences of the electrochemical behavior of dyes are discussed with consideration of underlying mechanism.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"983 ","pages":"Article 119043"},"PeriodicalIF":4.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143520514","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

Carbon-based thick films for electrochemical detection of neonicotinoid insecticides

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-26 DOI: 10.1016/j.jelechem.2025.119054

Barbara Repič , Gregor Marolt , Danjela Kuscer

Neonicotinoids (NNIs) are water-soluble, toxic, widespread-used systemic insecticides commonly found in the environment. Integrated electrochemical sensors enable the rapid on-site detection of NNIs in aqueous samples by analysing the reduction of the NNI's nitro functional group on the working electrode. We have investigated graphite (G), glassy carbon (GC) and carbon black (CB) thick films as working electrodes for the electrochemical detection of the NNI imidacloprid (IMD). Up to 35-μm-thick films of G, GC and CB on alumina were prepared by screen printing and subsequent firing at 850 °C in argon. G had the largest grain size, the roughest surface, and the lowest sheet resistance of 6.9 Ω/sq. GC and CB had a smoother surface, while their sheet resistances were up to 27 Ω/sq. All three films showed a reversible response to the Fe(CN)₆^3−/4− redox probe with G having the highest electrochemically active surface area and the highest heterogeneous electron transfer rate constant. In the IMD solution with neutral pH, G, GC and CB exhibited characteristic reduction peak at −1.1 V and a re-oxidation peak at +0.2 V. An additional adsorption cathodic peak was observed with CB, indicating a significantly higher affinity of CB for IMD adsorption. With LODs under 1 μM, the G, GC and CB pristine thick films exhibiting great potential for the sensitive detection of IMD.

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引用次数: 0

N, P co-doping Co9S8/NC for enhanced the Electrocatalytic water splitting in all-pH

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-25 DOI: 10.1016/j.jelechem.2025.119044

Qianqian Song , Yang Chen , Yongjian Xu , Yatao Yan , Qianhui Wu , Fang Guo , Ming Chen , Guowang Diao

Hydrogen energy represents a form of green energy, and the electrolysis of water for hydrogen production is recognized as an efficient method. Current research is primarily focused on the development of catalysts that are both efficient and stable, particularly those capable of functioning consistently across the entire pH spectrum. In this work, Co₉S₈/NC co doped with N and P was successfully synthesized through a series of sulfurization, calcination, and phosphating operations using dual ligand Co-ZIF as the precursor. By coating a carbon layer and co doping with nitrogen and phosphorus, the catalytic performance and stability of hydrogen evolution reaction (HER) were significantly improved over the entire pH range. At a fixed current density of 10 mA cm⁻², the overpotential of HER was measured at voltages of 136, 96, and 194 mV in three different pH solutions. Furthermore, the electrocatalyst exhibits remarkable electrochemical stability over extended periods. After 20 h or 2000 cycles of testing, the catalytic activity did not show a significant decrease across the entire pH range, but rather exhibited a relatively sustained constant.

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引用次数: 0

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