Pub Date : 2025-04-04DOI: 10.1016/j.jelechem.2025.119107
Junjie Wei , Xiangyi Gong , Dongliang Wang , Jiaqing He , Houmei Dai , Kai Wang , Yuxin Li , Yuxiao Li , Ziguo Liu , Jiaquan Zhang
The two-electron water oxidation reaction (WOR) is a promising approach for hydrogen peroxide production, which have many advantages over two-electron oxygen reduction reaction and traditional anthraquinone process. However, the WOR are ordinarily prone to proceed in four-electron path which ends in molecular oxygen production for most water oxidation scenarios. Developing high selective 2 electron WOR catalyst is needed. In this research, a group of fluorine and antimony doped sin dioxide coated titanium electrodes (Ti/SnO2-Sb-F) were synthesized to study the effect of fluorine doping on hydrogen peroxide production through WOR. The hydrogen peroxide production on Ti/SnO2-Sb-F-2 can reached 10.34 μmol·cm−1·min−1 with a faradic efficiency of 30.13 % in sodium carbonate electrolyte solution. The production rate was 2.12 times higher than that of Ti/SnO2-Sb-F-0 without fluorine doping. Electrochemical characterization revealed that fluorine doping improved the conductivity of SnO2 and resulted in high electrochemical activity for WOR. Theoretical calculation manifested fluorine doping makes WOR more energetically favorable toward hydrogen peroxide production. This paper provides a substantial approach for selection and synthesis of effective catalyst for 2 e− WOR.
{"title":"Selective hydrogen peroxide production through water oxidation reaction on Ti/SnO2-Sb-F electrode: Exploring the role of fluorine doping","authors":"Junjie Wei , Xiangyi Gong , Dongliang Wang , Jiaqing He , Houmei Dai , Kai Wang , Yuxin Li , Yuxiao Li , Ziguo Liu , Jiaquan Zhang","doi":"10.1016/j.jelechem.2025.119107","DOIUrl":"10.1016/j.jelechem.2025.119107","url":null,"abstract":"<div><div>The two-electron water oxidation reaction (WOR) is a promising approach for hydrogen peroxide production, which have many advantages over two-electron oxygen reduction reaction and traditional anthraquinone process. However, the WOR are ordinarily prone to proceed in four-electron path which ends in molecular oxygen production for most water oxidation scenarios. Developing high selective 2 electron WOR catalyst is needed. In this research, a group of fluorine and antimony doped sin dioxide coated titanium electrodes (Ti/SnO<sub>2</sub>-Sb-F) were synthesized to study the effect of fluorine doping on hydrogen peroxide production through WOR. The hydrogen peroxide production on Ti/SnO<sub>2</sub>-Sb-F-2 can reached 10.34 μmol·cm<sup>−1</sup>·min<sup>−1</sup> with a faradic efficiency of 30.13 % in sodium carbonate electrolyte solution. The production rate was 2.12 times higher than that of Ti/SnO<sub>2</sub>-Sb-F-0 without fluorine doping. Electrochemical characterization revealed that fluorine doping improved the conductivity of SnO<sub>2</sub> and resulted in high electrochemical activity for WOR. Theoretical calculation manifested fluorine doping makes WOR more energetically favorable toward hydrogen peroxide production. This paper provides a substantial approach for selection and synthesis of effective catalyst for 2 e<sup>−</sup> WOR.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"987 ","pages":"Article 119107"},"PeriodicalIF":4.1,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799791","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}
Pub Date : 2025-04-03DOI: 10.1016/j.jelechem.2025.119079
Yunlong Bai , Jin Xu , Rongjiu Shi , Qi Fu , Boxin Wei , Changkun Yu , Cheng Sun
The present study originated from an investigation into the corrosion of pipeline steel by SRB metabolites of varying molecular weights, with a particular focus on the role of low-molecular organic acids (LOA). Metabolites with molecular weights below 3.5 kD were isolated using centrifugation and dialysis membranes. Results indicate that LOA contribute significantly to anodic dissolution, accounting for 78.9 %, 62.1 %, and 88.7 % of the overall corrosion process. Open circuit potential (OCP) measurements revealed that LOA shifted the potential to more negative values, suggesting increased susceptibility to corrosion. In contrast, macromolecular metabolites, such as extracellular polymeric substances (EPS), primarily induced pitting corrosion. The corrosion rate for coupons exposed to both LOA and macromolecular metabolites reached 0.103 mm·y−1, demonstrating a synergistic effect that accelerates electrochemical corrosion. The study analyzed the corrosion mechanism of SRB metabolites more deeply, and has contributed positively to the MIC protection to increase the usage rate of pipeline steel.
{"title":"The effect of low-molecular organic acids (LOA) obtained by 3.5 kD cutoff dialysis membrane the behavior of pipeline steel","authors":"Yunlong Bai , Jin Xu , Rongjiu Shi , Qi Fu , Boxin Wei , Changkun Yu , Cheng Sun","doi":"10.1016/j.jelechem.2025.119079","DOIUrl":"10.1016/j.jelechem.2025.119079","url":null,"abstract":"<div><div>The present study originated from an investigation into the corrosion of pipeline steel by SRB metabolites of varying molecular weights, with a particular focus on the role of low-molecular organic acids (LOA). Metabolites with molecular weights below 3.5 kD were isolated using centrifugation and dialysis membranes. Results indicate that LOA contribute significantly to anodic dissolution, accounting for 78.9 %, 62.1 %, and 88.7 % of the overall corrosion process. Open circuit potential (OCP) measurements revealed that LOA shifted the potential to more negative values, suggesting increased susceptibility to corrosion. In contrast, macromolecular metabolites, such as extracellular polymeric substances (EPS), primarily induced pitting corrosion. The corrosion rate for coupons exposed to both LOA and macromolecular metabolites reached 0.103 mm·y<sup>−1</sup>, demonstrating a synergistic effect that accelerates electrochemical corrosion. The study analyzed the corrosion mechanism of SRB metabolites more deeply, and has contributed positively to the MIC protection to increase the usage rate of pipeline steel.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"987 ","pages":"Article 119079"},"PeriodicalIF":4.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792103","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}
Pub Date : 2025-04-03DOI: 10.1016/j.jelechem.2025.119106
Buse Ecevit, İzel Almira Öztürk, Yıldıray Topcu, Burak Tekin
Zinc-ion hybrid supercapacitors have emerged as a promising technology, combining the high energy density of batteries with the high-power density of supercapacitors. This study investigates the performance of zinc-ion hybrid supercapacitors utilizing boron-doped (B-doped) and undoped activated carbon (AC) as electrode materials. Recognizing the importance of sustainability, we utilized activated carbon derived from locally abundant sunflower seed shells through a controlled pyrolysis process. The synthesized B-doped and undoped AC materials were comprehensively characterized using advanced techniques, including X-ray Diffraction (XRD) to confirm the amorphous carbon structure, Fourier-Transform Infrared (FTIR) spectroscopy to identify functional groups, and Thermogravimetric Analysis (TGA) to assess the thermochemical properties and volatile matter content. Raman spectroscopy revealed that the intensity ratio of the D-band to G-band (ID/IG) was 0.938 for the B-doped AC and 0.832 for the undoped AC, indicating an increased level of disorder in the carbon lattice due to boron incorporation. This was further supported by X-ray Photoelectron Spectroscopy (XPS), which confirmed the presence of boron in the B-doped AC, validating the successful doping process. BET analysis revealed a significant increase in surface area for the B-doped AC (600 m2/g) compared to the undoped AC (200 m2/g), which contributed to the enhanced electrochemical performance of the B-doped material. Electrochemical performance was evaluated through methods such as Cyclic Voltammetry (CV), constant-current charge-discharge tests, and Electrochemical Impedance Spectroscopy (EIS). The study examined the influence of ZnSO₄ electrolyte concentration (ranging from 0.5 to 2 M) on the performance of the Zn-ion hybrid supercapacitor. Notably, the B-doped AC material exhibited superior performance, delivering a gravimetric capacitance of approximately 105 F/cm2 in 1.5 M ZnSO₄ electrolyte at a current density of 0.1 mA/cm2, with 100 % coulombic efficiency retained over 100 cycles. This performance was significantly enhanced compared to the undoped AC material, which delivered around 45 F/cm2 under the same conditions. The findings underscore the potential of B-doping in improving the electrochemical properties of sustainable carbonaceous materials, offering an effective pathway toward high-performance zinc-ion hybrid supercapacitors using locally available resources.
{"title":"From sunflower shells to hybrid-power cells: Boron-enhanced carbon electrodes for next-generation Zn-ion supercapacitors","authors":"Buse Ecevit, İzel Almira Öztürk, Yıldıray Topcu, Burak Tekin","doi":"10.1016/j.jelechem.2025.119106","DOIUrl":"10.1016/j.jelechem.2025.119106","url":null,"abstract":"<div><div>Zinc-ion hybrid supercapacitors have emerged as a promising technology, combining the high energy density of batteries with the high-power density of supercapacitors. This study investigates the performance of zinc-ion hybrid supercapacitors utilizing boron-doped (B-doped) and undoped activated carbon (AC) as electrode materials. Recognizing the importance of sustainability, we utilized activated carbon derived from locally abundant sunflower seed shells through a controlled pyrolysis process. The synthesized B-doped and undoped AC materials were comprehensively characterized using advanced techniques, including X-ray Diffraction (XRD) to confirm the amorphous carbon structure, Fourier-Transform Infrared (FTIR) spectroscopy to identify functional groups, and Thermogravimetric Analysis (TGA) to assess the thermochemical properties and volatile matter content. Raman spectroscopy revealed that the intensity ratio of the D-band to G-band (I<sub>D</sub>/I<sub>G</sub>) was 0.938 for the B-doped AC and 0.832 for the undoped AC, indicating an increased level of disorder in the carbon lattice due to boron incorporation. This was further supported by X-ray Photoelectron Spectroscopy (XPS), which confirmed the presence of boron in the B-doped AC, validating the successful doping process. BET analysis revealed a significant increase in surface area for the B-doped AC (600 m<sup>2</sup>/g) compared to the undoped AC (200 m<sup>2</sup>/g), which contributed to the enhanced electrochemical performance of the B-doped material. Electrochemical performance was evaluated through methods such as Cyclic Voltammetry (CV), constant-current charge-discharge tests, and Electrochemical Impedance Spectroscopy (EIS). The study examined the influence of ZnSO₄ electrolyte concentration (ranging from 0.5 to 2 M) on the performance of the Zn-ion hybrid supercapacitor. Notably, the B-doped AC material exhibited superior performance, delivering a gravimetric capacitance of approximately 105 F/cm<sup>2</sup> in 1.5 M ZnSO₄ electrolyte at a current density of 0.1 mA/cm<sup>2</sup>, with 100 % coulombic efficiency retained over 100 cycles. This performance was significantly enhanced compared to the undoped AC material, which delivered around 45 F/cm<sup>2</sup> under the same conditions. The findings underscore the potential of B-doping in improving the electrochemical properties of sustainable carbonaceous materials, offering an effective pathway toward high-performance zinc-ion hybrid supercapacitors using locally available resources.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"987 ","pages":"Article 119106"},"PeriodicalIF":4.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777081","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}
Pub Date : 2025-04-03DOI: 10.1016/j.jelechem.2025.119104
Xuzhang Lin , Dongbin Hong , Cheng Wu , Lujiao Mao , Yanqiong Shen , Qipeng Li , Jinjie Qian
The hydrogen evolution reaction (HER) is a crucial step in water electrolysis with significant potential for converting intermittent renewable energy into storable hydrogen fuel. Metal-organic framework (MOF) derived metal‑carbon nanomaterials have garnered considerable attention as prominent HER electrocatalysts. In this work, we introduce ultrafine PtNi particles embedded in Ni-MOF-on-Zn-MOF-derived N-doped carbon materials, designated as NZBD-PtNi-NC. Benefiting from their large specific surface area, well-defined porous structure, and tunable chemical composition, the obtained NZBD-PtNi-NC exhibits a low overpotential of 51 mV at 10 mA cm−2 and demonstrates high stability exceeding 30 h. The synergistic alloying of Pt and Ni not only boosts catalytic efficiency but also reduces Pt consumption, thereby enhancing the overall economic viability of the catalyst. These findings underscore the potential of MOF-derived low-loading precious metal-based carbon nanomaterials as highly efficient and stable electrocatalysts for HER.
氢进化反应（HER）是水电解过程中的一个关键步骤，具有将间歇性可再生能源转化为可储存氢燃料的巨大潜力。金属有机框架（MOF）衍生的金属碳纳米材料作为突出的氢进化反应电催化剂已引起了广泛关注。在这项工作中，我们引入了嵌入 Ni-MOF-on-Zn-MOF 衍生 N 掺杂碳材料（命名为 NZBD-PtNi-NC）中的超细铂镍颗粒。铂和镍的协同合金化不仅提高了催化效率，还降低了铂的消耗，从而提高了催化剂的整体经济可行性。这些发现强调了 MOF 衍生的低负载贵金属基碳纳米材料作为高效、稳定的 HER 电催化剂的潜力。
{"title":"PtNi nanoparticles embedded in Ni-MOF-on-Zn-MOF derived carbon nanosheets for enhanced hydrogen evolution","authors":"Xuzhang Lin , Dongbin Hong , Cheng Wu , Lujiao Mao , Yanqiong Shen , Qipeng Li , Jinjie Qian","doi":"10.1016/j.jelechem.2025.119104","DOIUrl":"10.1016/j.jelechem.2025.119104","url":null,"abstract":"<div><div>The hydrogen evolution reaction (HER) is a crucial step in water electrolysis with significant potential for converting intermittent renewable energy into storable hydrogen fuel. Metal-organic framework (MOF) derived metal‑carbon nanomaterials have garnered considerable attention as prominent HER electrocatalysts. In this work, we introduce ultrafine PtNi particles embedded in Ni-MOF-on-Zn-MOF-derived N-doped carbon materials, designated as NZBD-PtNi-NC. Benefiting from their large specific surface area, well-defined porous structure, and tunable chemical composition, the obtained NZBD-PtNi-NC exhibits a low overpotential of 51 mV at 10 mA cm<sup>−2</sup> and demonstrates high stability exceeding 30 h. The synergistic alloying of Pt and Ni not only boosts catalytic efficiency but also reduces Pt consumption, thereby enhancing the overall economic viability of the catalyst. These findings underscore the potential of MOF-derived low-loading precious metal-based carbon nanomaterials as highly efficient and stable electrocatalysts for HER.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"987 ","pages":"Article 119104"},"PeriodicalIF":4.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777001","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}
Pub Date : 2025-04-02DOI: 10.1016/j.jelechem.2025.119105
Yu Fu , Lijie Qi , Wanli Kang , Saule B. Aidarova , Hongbin Yang , Shujun Liu
The construction of electrocatalytic cathodic nitrate reduction and anodic polyacrylamide (HPAM) oxidation reactions is a promising new electrocatalytic reaction system, which promises simultaneous ammonia synthesis and HPAM degradation. Here, we synthesised an N-doped C nanotube-encapsulated CoNi nano-alloy and used it for electrocatalytic NO3− reduction and HPAM oxidation reactions. Therein, CoNi-0.5 could achieve the maximum ammonia yield and Faraday efficiency of 5516.73 ± 66.07 μg h−1 mgcat−1 and 94.71 ± 1.21 %, respectively. Meanwhile, the maximum degradation rate of HPAM was 73.02 ± 1.16 % at 2 h. By In-situ ATR-SEIRAS, in-situ DEMS demonstrated that *NOH is an important reaction intermediate in the ammonia synthesis process, and the bimetallic CoNi alloy can effectively reduce the reaction energy barrier for NO3− reduction. This work presents a new strategy for constructing a coupled system for electrocatalytic NO3− reduction.
{"title":"A bifunctional CoNi alloy for electrocatalytically coupled cathodic nitrate reduction and anodic HPAM oxidation","authors":"Yu Fu , Lijie Qi , Wanli Kang , Saule B. Aidarova , Hongbin Yang , Shujun Liu","doi":"10.1016/j.jelechem.2025.119105","DOIUrl":"10.1016/j.jelechem.2025.119105","url":null,"abstract":"<div><div>The construction of electrocatalytic cathodic nitrate reduction and anodic polyacrylamide (HPAM) oxidation reactions is a promising new electrocatalytic reaction system, which promises simultaneous ammonia synthesis and HPAM degradation. Here, we synthesised an N-doped C nanotube-encapsulated CoNi nano-alloy and used it for electrocatalytic NO<sub>3</sub><sup>−</sup> reduction and HPAM oxidation reactions. Therein, CoNi-0.5 could achieve the maximum ammonia yield and Faraday efficiency of 5516.73 ± 66.07 μg h<sup>−1</sup> mg<sub>cat</sub><sup>−1</sup> and 94.71 ± 1.21 %, respectively. Meanwhile, the maximum degradation rate of HPAM was 73.02 ± 1.16 % at 2 h. By In-situ ATR-SEIRAS, in-situ DEMS demonstrated that *NOH is an important reaction intermediate in the ammonia synthesis process, and the bimetallic CoNi alloy can effectively reduce the reaction energy barrier for NO<sub>3</sub><sup>−</sup> reduction. This work presents a new strategy for constructing a coupled system for electrocatalytic NO<sub>3</sub><sup>−</sup> reduction.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"987 ","pages":"Article 119105"},"PeriodicalIF":4.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777080","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}
Pub Date : 2025-04-01DOI: 10.1016/j.jelechem.2025.119103
Yu Zhou, Xinyue Gao, Wenkai Gao, Tianchen Ma, Ya Qu, Shengqi Sui, Yunlong Yue, Junfeng Kang
Aqueous zinc-ion batteries (AZIBs) have received widespread attention due to their high safety, low cost, and high energy density. However, challenges of cathode materials such as structural collapse, inadequate electronic conductivity, and sluggish Zn2+ diffusion kinetics have limited the development of AZIBs. Herein, amorphous V2O5 (a-V2O5) is synthesized using a facile precipitation method for large-scale preparation, and decorated with polyaniline (PANI) nanoparticles for surface modification, resulting in the composite structure of a-V2O5@PANI. The highly disordered lattice structure and abundant structural defects of a-V2O5 provide numerous active sites for Zn2+ storage. Moreover, the conductive PANI adsorbs on the surface of a-V2O5, which makes up for its inherently poor conductivity and improves the Zn2+ diffusion kinetics. In addition, further electrochemical analysis and structure characterization confirm that the a-V2O5@PANI is favorable to form a highly active intermediate phase i.e. Zn3(OH)2V2O7·2H2O during cycling, which presents excellent electrical conductivity and diffusion kinetics. Furthermore, the a-V2O5@PANI cathode exhibits high electrochemical reversibility and structural stability. As a result, the a-V2O5@PANI composite achieves an excellent high rate capability of 195.1 mAh g−1 at a current density of 10 A g−1 and a long cycling life with the capacity retention of 88.3 % at a current density of 5 A g−1 after 1000 cycles. This work provides a high-performance cathode material that can be prepared on a large scale for AZIBs and improves the understanding of amorphous vanadium oxides for Zn2+ storage.
{"title":"Controlled construction of polyaniline-modified amorphous vanadium pentoxide composite cathode for high performance aqueous zinc-ion batteries","authors":"Yu Zhou, Xinyue Gao, Wenkai Gao, Tianchen Ma, Ya Qu, Shengqi Sui, Yunlong Yue, Junfeng Kang","doi":"10.1016/j.jelechem.2025.119103","DOIUrl":"10.1016/j.jelechem.2025.119103","url":null,"abstract":"<div><div>Aqueous zinc-ion batteries (AZIBs) have received widespread attention due to their high safety, low cost, and high energy density. However, challenges of cathode materials such as structural collapse, inadequate electronic conductivity, and sluggish Zn<sup>2+</sup> diffusion kinetics have limited the development of AZIBs. Herein, amorphous V<sub>2</sub>O<sub>5</sub> (a-V<sub>2</sub>O<sub>5</sub>) is synthesized using a facile precipitation method for large-scale preparation, and decorated with polyaniline (PANI) nanoparticles for surface modification, resulting in the composite structure of a-V<sub>2</sub>O<sub>5</sub>@PANI. The highly disordered lattice structure and abundant structural defects of a-V<sub>2</sub>O<sub>5</sub> provide numerous active sites for Zn<sup>2+</sup> storage. Moreover, the conductive PANI adsorbs on the surface of a-V<sub>2</sub>O<sub>5</sub>, which makes up for its inherently poor conductivity and improves the Zn<sup>2+</sup> diffusion kinetics. In addition, further electrochemical analysis and structure characterization confirm that the a-V<sub>2</sub>O<sub>5</sub>@PANI is favorable to form a highly active intermediate phase i.e. Zn<sub>3</sub>(OH)<sub>2</sub>V<sub>2</sub>O<sub>7</sub>·2H<sub>2</sub>O during cycling, which presents excellent electrical conductivity and diffusion kinetics. Furthermore, the a-V<sub>2</sub>O<sub>5</sub>@PANI cathode exhibits high electrochemical reversibility and structural stability. As a result, the a-V<sub>2</sub>O<sub>5</sub>@PANI composite achieves an excellent high rate capability of 195.1 mAh g<sup>−1</sup> at a current density of 10 A g<sup>−1</sup> and a long cycling life with the capacity retention of 88.3 % at a current density of 5 A g<sup>−1</sup> after 1000 cycles. This work provides a high-performance cathode material that can be prepared on a large scale for AZIBs and improves the understanding of amorphous vanadium oxides for Zn<sup>2+</sup> storage.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"986 ","pages":"Article 119103"},"PeriodicalIF":4.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769276","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}
Pub Date : 2025-04-01DOI: 10.1016/j.jelechem.2025.119102
Kangkang Zhao , Jiangwei Liu , Wencheng Liu , Xiaoxiao Zheng , Safia Khan , Yafei Ning , Hu Li , Kuihua Han
Development of stable, active and noble-metal-free catalysts is substantial for leading-edge technology of high-efficiency zinc-air batteries. In this study, β-cyclodextrin is employed as the coating material as well as reducing agent to develop a nitrogen-doped carbon layer-encapsulated Co nanoparticle catalyst. The catalyst demonstrated a significant synergistic effect between Co nanoparticles and N-β-CD, exhibiting exceptional performance, durability, and methanol tolerance in both the oxygen reduction reaction and oxygen evolution reaction. Aqueous electrolyte ZAB demonstrated a high peak power density of 146.2 mW cm−2, a specific capacity of up to 783.3 mAh g−1, and long-term stability for over 500 h, thereby proposing a novel synthetic strategy for economical non-precious metal catalysts. Enormous potential of integrating the N-β-CD@CoNPs catalyst architecture is validated for advanced energy storage and conversion devices.
{"title":"Application of nitrogen-doped graphene-like cobalt nanoparticle composite catalysts in zinc-air batteries","authors":"Kangkang Zhao , Jiangwei Liu , Wencheng Liu , Xiaoxiao Zheng , Safia Khan , Yafei Ning , Hu Li , Kuihua Han","doi":"10.1016/j.jelechem.2025.119102","DOIUrl":"10.1016/j.jelechem.2025.119102","url":null,"abstract":"<div><div>Development of stable, active and noble-metal-free catalysts is substantial for leading-edge technology of high-efficiency zinc-air batteries. In this study, β-cyclodextrin is employed as the coating material as well as reducing agent to develop a nitrogen-doped carbon layer-encapsulated Co nanoparticle catalyst. The catalyst demonstrated a significant synergistic effect between Co nanoparticles and N-β-CD, exhibiting exceptional performance, durability, and methanol tolerance in both the oxygen reduction reaction and oxygen evolution reaction. Aqueous electrolyte ZAB demonstrated a high peak power density of 146.2 mW cm<sup>−2</sup>, a specific capacity of up to 783.3 mAh g<sup>−1</sup>, and long-term stability for over 500 h, thereby proposing a novel synthetic strategy for economical non-precious metal catalysts. Enormous potential of integrating the N-β-CD@CoNPs catalyst architecture is validated for advanced energy storage and conversion devices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"986 ","pages":"Article 119102"},"PeriodicalIF":4.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760683","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}
Pub Date : 2025-03-31DOI: 10.1016/j.jelechem.2025.119093
Xinyi Zhang , Luping Zhang , Jiahao Wu , Wenqi Bai , Houde Dai , Haijun Lin , Fu Zhang , Yuxiang Yang
Lithium-ion batteries (LIBs) are currently the most widely used new energy storage devices, whose state of charge (SOC) estimation is critical for their safe operation. Electrochemical impedance spectroscopy (EIS) reveals detailed characteristics of the LIB's electrochemical state, making it useful for SOC estimation. This paper proposes a SOC estimation method based on random forest (RF) combined with a convolutional neural network (CNN) (RF-CNN algorithm) using an equivalent circuit model (ECM) and Nyquist plots from EIS data. Firstly, the ECM parameters are fitted from the 1D EIS data. Then, CNNs are employed to extract the image features (shapes and edges) from the 2D Nyquist plot of EIS data. Finally, the fitted ECM parameters, along with the extracted image features, serve as inputs for the RF algorithm, in which Optuna is utilized for hyperparameter tuning to refine SOC estimation. Experiments on open-access EIS datasets of LIBs demonstrate that the proposed SOC estimation method achieves the best performance in terms of accuracy and speed with a determination coefficient of 0.9926 in 5-fold cross-validation. By integrating 1D ECM parameters with 2D Nyquist plot features, this paper establishes an effective SOC estimation method for LIBs based on the RF-CNN machine learning approach and has important reference values for battery SOC estimation based on small-sample EIS datasets.
{"title":"SOC estimation of lithium-ion batteries using equivalent circuit model and Nyquist plots from EIS data: A machine learning approach","authors":"Xinyi Zhang , Luping Zhang , Jiahao Wu , Wenqi Bai , Houde Dai , Haijun Lin , Fu Zhang , Yuxiang Yang","doi":"10.1016/j.jelechem.2025.119093","DOIUrl":"10.1016/j.jelechem.2025.119093","url":null,"abstract":"<div><div>Lithium-ion batteries (LIBs) are currently the most widely used new energy storage devices, whose state of charge (SOC) estimation is critical for their safe operation. Electrochemical impedance spectroscopy (EIS) reveals detailed characteristics of the LIB's electrochemical state, making it useful for SOC estimation. This paper proposes a SOC estimation method based on random forest (RF) combined with a convolutional neural network (CNN) (RF-CNN algorithm) using an equivalent circuit model (ECM) and Nyquist plots from EIS data. Firstly, the ECM parameters are fitted from the 1D EIS data. Then, CNNs are employed to extract the image features (shapes and edges) from the 2D Nyquist plot of EIS data. Finally, the fitted ECM parameters, along with the extracted image features, serve as inputs for the RF algorithm, in which Optuna is utilized for hyperparameter tuning to refine SOC estimation. Experiments on open-access EIS datasets of LIBs demonstrate that the proposed SOC estimation method achieves the best performance in terms of accuracy and speed with a determination coefficient of 0.9926 in 5-fold cross-validation. By integrating 1D ECM parameters with 2D Nyquist plot features, this paper establishes an effective SOC estimation method for LIBs based on the RF-CNN machine learning approach and has important reference values for battery SOC estimation based on small-sample EIS datasets.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"987 ","pages":"Article 119093"},"PeriodicalIF":4.1,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777000","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}
The rising need for energy storage solutions has generated substantial interest in the exploration of advanced battery technologies. Due to their environmental sustainability and affordability, aqueous zinc-ion batteries (AZIBs) have attracted significant attention. This research presents a MnO2@rGO@HCS cathode material featuring a distinctive ordered 3D hierarchical framework synthesized by the hydrothermal method. The non-template in-situ grown hollow carbon spheres (HCS) on reduced graphene oxide (rGO) create a comprehensive ordered network of channels that can serve as “highways” for electrolyte transport. MnO2 nanoparticles are then uniformly deposited within this framework, forming numerous “service stations” that provide ample ion storage sites along the transport pathways. This architecture not only accelerates ion transport but also significantly improves ion storage capacity. Electrochemical tests reveal that the MnO2@rGO@HCS cathode achieves exceptional performance with a specific capacity of 405 mA h·g−1 at 0.2 A·g−1 current density. This study offers a new approach for constructing a 3D ordered microstructure supported by HCS to efficiently load active materials as high-performance cathodes for AZIBs.
{"title":"A novel 3D framework loaded with MnO2 for high-performance aqueous zinc-ion battery cathode","authors":"Haodong Ding, Yingying He, Xuelian Yu, Lijun Chen, Mingze Chen, Yongming Luo, Jiarun Li, Sichen Wei","doi":"10.1016/j.jelechem.2025.119101","DOIUrl":"10.1016/j.jelechem.2025.119101","url":null,"abstract":"<div><div>The rising need for energy storage solutions has generated substantial interest in the exploration of advanced battery technologies. Due to their environmental sustainability and affordability, aqueous zinc-ion batteries (AZIBs) have attracted significant attention. This research presents a MnO<sub>2</sub>@rGO@HCS cathode material featuring a distinctive ordered 3D hierarchical framework synthesized by the hydrothermal method. The non-template in-situ grown hollow carbon spheres (HCS) on reduced graphene oxide (rGO) create a comprehensive ordered network of channels that can serve as “highways” for electrolyte transport. MnO<sub>2</sub> nanoparticles are then uniformly deposited within this framework, forming numerous “service stations” that provide ample ion storage sites along the transport pathways. This architecture not only accelerates ion transport but also significantly improves ion storage capacity. Electrochemical tests reveal that the MnO<sub>2</sub>@rGO@HCS cathode achieves exceptional performance with a specific capacity of 405 mA h·g<sup>−1</sup> at 0.2 A·g<sup>−1</sup> current density. This study offers a new approach for constructing a 3D ordered microstructure supported by HCS to efficiently load active materials as high-performance cathodes for AZIBs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"986 ","pages":"Article 119101"},"PeriodicalIF":4.1,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748535","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}
Pub Date : 2025-03-31DOI: 10.1016/j.jelechem.2025.119100
Le Li , Donglei Yang , Li Ying , Shuanqiang Liu
Improving the kinetics of alkaline hydrogen oxidation reaction (HOR) is the key point for developing anion-exchange membrane fuel cells. Surface oxophilicity modification of catalysts has been demonstrated to be an effective strategy for substantially accelerating the kinetics of alkaline HOR, while the mechanism of HOR and the influences of surface oxophilicity modification on the performance of catalysts is still unclear and under debate. Against this background, this review starts by discussing the HOR mechanism and the prevailing theories, including the hydrogen binding energy (HBE), bifunctional and some other theories. Next, the effects of surface oxophilicity on HOR activity are also emphasized, which include the regulation of HBE and hydroxyl binding energy (OHBE), weakening the binding strength of CO, and improving the antioxidation capability. Moreover, the applications of various electrocatalysts with high surface oxophilicity toward electrocatalytic HOR are also manifested. Lastly, the remaining controversies about the modification of surface oxophilicity and alkaline HOR mechanisms as well as the possible directions of this field are also outlined.
{"title":"Recent advances in surface oxophilicity modification of catalyst for promoting electrocatalytic alkaline hydrogen oxidation reaction","authors":"Le Li , Donglei Yang , Li Ying , Shuanqiang Liu","doi":"10.1016/j.jelechem.2025.119100","DOIUrl":"10.1016/j.jelechem.2025.119100","url":null,"abstract":"<div><div>Improving the kinetics of alkaline hydrogen oxidation reaction (HOR) is the key point for developing anion-exchange membrane fuel cells. Surface oxophilicity modification of catalysts has been demonstrated to be an effective strategy for substantially accelerating the kinetics of alkaline HOR, while the mechanism of HOR and the influences of surface oxophilicity modification on the performance of catalysts is still unclear and under debate. Against this background, this review starts by discussing the HOR mechanism and the prevailing theories, including the hydrogen binding energy (HBE), bifunctional and some other theories. Next, the effects of surface oxophilicity on HOR activity are also emphasized, which include the regulation of HBE and hydroxyl binding energy (OHBE), weakening the binding strength of CO, and improving the antioxidation capability. Moreover, the applications of various electrocatalysts with high surface oxophilicity toward electrocatalytic HOR are also manifested. Lastly, the remaining controversies about the modification of surface oxophilicity and alkaline HOR mechanisms as well as the possible directions of this field are also outlined.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"986 ","pages":"Article 119100"},"PeriodicalIF":4.1,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760681","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}
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