Pub Date : 2024-02-23DOI: 10.33961/jecst.2023.00948
Hye Young Jung, Yong Seok Jun, Kwan-Young Lee, Hyun S. Park, Sung Ki Cho, Jong Hyun Jang
Proton exchange membrane water electrolysis (PEMWE) is an efficient method for utilizing renewable energy sources such as wind and solar powers to produce green hydrogen. For PEMWE powered by renewable energy sources, its durability is a crucial factor in its performance since irregular and fluctuating characteristics of renewable energy sources, especially for wind power, can deteriorate the stability of PEMWE. Triangular voltage cycle is well able to simulate fluctuating wind power, but its effect on the durability has not been investigated extensively. In this study, the performance degradation of the PEMWE cell operated with the triangular voltage cycling was investigated at different ramping rates. The measured current responses during the cycling gradually decreased for both ramping rates, and I–V curve measurements before and after the cycling confirmed the degradation of the performances of PEMWE. For both measurements, the degradation rate was larger for 300 mV s -1 than 30 mV s -1 , and they were determined as 0.36 and 1.26 mV h −1 (at the current density of 2 A cm −2 ) at the ramping rates of 30 and 300 mV s −1 , respectively. The comparison with other studies on triangular voltage cycling also indicate that an increase in the ramping rate accelerates the deterioration of the PEMWE performance. X-ray photoelectron spectroscopy and transmission electron microscopy results showed that the Ir catalyst was oxidized and did not dissolve during the voltage cycling. This study suggests that the ramping rate of the triangular voltage cycling is an important factor for the evaluation of the durability of PEMWE cells.
质子交换膜水电解法（PEMWE）是一种利用风能和太阳能等可再生能源生产绿色氢气的有效方法。对于以可再生能源为动力的质子交换膜水电解法来说，其耐用性是影响其性能的关键因素，因为可再生能源（尤其是风能）的不规则和波动特性会降低质子交换膜水电解法的稳定性。三角电压周期能够很好地模拟波动的风力发电，但其对耐用性的影响尚未得到广泛研究。在本研究中，研究了在不同升压速率下三角电压循环运行的 PEMWE 电池的性能退化情况。在两种升压速率下，循环过程中测得的电流响应逐渐减小，循环前后的 I-V 曲线测量证实了 PEMWE 的性能退化。在这两次测量中，300 mV s -1 的衰减率大于 30 mV s -1 的衰减率，在升压速率为 30 mV s -1 和 300 mV s -1 时，衰减率分别为 0.36 和 1.26 mV h -1 （电流密度为 2 A cm -2 时）。与其他三角电压循环研究的比较也表明，升压速率的增加会加速 PEMWE 性能的恶化。X 射线光电子能谱和透射电子显微镜结果表明，在电压循环过程中，Ir 催化剂被氧化，但没有溶解。这项研究表明，三角电压循环的斜率是评估 PEMWE 电池耐用性的一个重要因素。
{"title":"Effect of Ramping Rate on the Durability of Proton Exchange Membrane Water Electrolysis During Dynamic Operation Using Triangular Voltage Cycling","authors":"Hye Young Jung, Yong Seok Jun, Kwan-Young Lee, Hyun S. Park, Sung Ki Cho, Jong Hyun Jang","doi":"10.33961/jecst.2023.00948","DOIUrl":"https://doi.org/10.33961/jecst.2023.00948","url":null,"abstract":"Proton exchange membrane water electrolysis (PEMWE) is an efficient method for utilizing renewable energy sources such as wind and solar powers to produce green hydrogen. For PEMWE powered by renewable energy sources, its durability is a crucial factor in its performance since irregular and fluctuating characteristics of renewable energy sources, especially for wind power, can deteriorate the stability of PEMWE. Triangular voltage cycle is well able to simulate fluctuating wind power, but its effect on the durability has not been investigated extensively. In this study, the performance degradation of the PEMWE cell operated with the triangular voltage cycling was investigated at different ramping rates. The measured current responses during the cycling gradually decreased for both ramping rates, and I–V curve measurements before and after the cycling confirmed the degradation of the performances of PEMWE. For both measurements, the degradation rate was larger for 300 mV s -1 than 30 mV s -1 , and they were determined as 0.36 and 1.26 mV h −1 (at the current density of 2 A cm −2 ) at the ramping rates of 30 and 300 mV s −1 , respectively. The comparison with other studies on triangular voltage cycling also indicate that an increase in the ramping rate accelerates the deterioration of the PEMWE performance. X-ray photoelectron spectroscopy and transmission electron microscopy results showed that the Ir catalyst was oxidized and did not dissolve during the voltage cycling. This study suggests that the ramping rate of the triangular voltage cycling is an important factor for the evaluation of the durability of PEMWE cells.","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"1 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140436138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-23DOI: 10.33961/jecst.2023.01004
Kyungsoon Park, Thanh Duc Dinh, Seongpil Hwang
An unconventional fabrication technique of nanoelectrode was developed using atomic force microscopy (AFM) and hydrogel. Until now, the precise control of electroactive area down to a few nm 2 has always been an obstacle, which limits the wide application of nanoelectrodes. Here, the nanometer-sized contact between the boron-doped diamond (BDD) as conductive AFM tip and the agarose hydrogel as solid electrolyte was well governed by the feedback amplitude of oscillation in the non-contact mode of AFM. Consequently, this low-cost and feasible approach gives rise to new possibilities for the fabrication of nanoelectrodes. The electroactive area controlled by the set point of AFM was investigated by cyclic voltammetry (CV) of the ferrocenmethanol (FcMeOH) combined with quasi-solid agarose hydrogel as an electrolyte. Single copper (Cu) nanoparticle was deposited at the apex of the AFM tip using this platform whose electrocatalytic activity for nitrate reduction was then investigated by CV and Field Emission-Scanning Electron Microscopy (FE-SEM), respectively.
{"title":"Atomic Force Microscopy (AFM) Tip based Nanoelectrode with Hydrogel Electrolyte and Application to Single-Nanoriparticle Electrochemistry","authors":"Kyungsoon Park, Thanh Duc Dinh, Seongpil Hwang","doi":"10.33961/jecst.2023.01004","DOIUrl":"https://doi.org/10.33961/jecst.2023.01004","url":null,"abstract":"An unconventional fabrication technique of nanoelectrode was developed using atomic force microscopy (AFM) and hydrogel. Until now, the precise control of electroactive area down to a few nm 2 has always been an obstacle, which limits the wide application of nanoelectrodes. Here, the nanometer-sized contact between the boron-doped diamond (BDD) as conductive AFM tip and the agarose hydrogel as solid electrolyte was well governed by the feedback amplitude of oscillation in the non-contact mode of AFM. Consequently, this low-cost and feasible approach gives rise to new possibilities for the fabrication of nanoelectrodes. The electroactive area controlled by the set point of AFM was investigated by cyclic voltammetry (CV) of the ferrocenmethanol (FcMeOH) combined with quasi-solid agarose hydrogel as an electrolyte. Single copper (Cu) nanoparticle was deposited at the apex of the AFM tip using this platform whose electrocatalytic activity for nitrate reduction was then investigated by CV and Field Emission-Scanning Electron Microscopy (FE-SEM), respectively.","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"21 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-23DOI: 10.33961/jecst.2023.00745
Jiangwei Lu, Zhengyang Xu, Tianyu Geng
: Due to its unique advantages, electrochemical machining (ECM) is playing an increasingly significant role in the manufacture of difficult-to-machine materials. Most of the current ECM research is conducted at room temperature
{"title":"Low temperature interface modification: Electrochemical dissolution mechanism of typical iron and nickel base alloys","authors":"Jiangwei Lu, Zhengyang Xu, Tianyu Geng","doi":"10.33961/jecst.2023.00745","DOIUrl":"https://doi.org/10.33961/jecst.2023.00745","url":null,"abstract":": Due to its unique advantages, electrochemical machining (ECM) is playing an increasingly significant role in the manufacture of difficult-to-machine materials. Most of the current ECM research is conducted at room temperature","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"9 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140435528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-23DOI: 10.33961/jecst.2023.00773
Hojin Kim, Jinju Kim, Sungyu Park, Je Hyun Bae
: To date, methods used to assess the interfacial transition zone (ITZ), which represents the boundary between the aggregate and paste inside concretes, have primarily relied on destructive tests, and non-destructive tests has received little attention until recently. This study assessed the interfaces of concretes with lightweight aggregates based on electrochemical impedance spectroscopy (EIS) for high-strength concretes and examined the possibility of estimating the compressive strength of concretes through non-destructive testing using EIS. The experimental results revealed that the impedance of the hardened cement increased with increasing compressive strength and aggregate density. In particular, when the results of impedance measurement were displayed as a Nyquist plot, the intercept of the x-axis depicting the effective conductivity was proportional to the compressive strength. Furthermore, an equivalent circuit was selected to interpret the correlation between cement aggregates and impedance. Consequently, the compressive strength was found to increase with the value of the resistances of the electrolyte filled in continuous pores in the cement aggregate. And, the pores formed in the ITZ affect this value. The resistance at the ITZ for different aggregates was also obtained, and it was found that the resistance was consistent with the results predicted by SEM images of the ITZ and correlated with the strength of the concretes. The proposed method can be used as a way to easily determine the strength of cement according to differences in aggregate.
:迄今为止，用于评估界面过渡区（ITZ）（ITZ 代表混凝土内部骨料和浆料之间的边界）的方法主要依赖于破坏性试验，而非破坏性试验直到最近才受到重视。本研究基于高强度混凝土的电化学阻抗谱（EIS）评估了轻质骨料混凝土的界面，并研究了利用 EIS 通过非破坏性测试估算混凝土抗压强度的可能性。实验结果表明，硬化水泥的阻抗随抗压强度和骨料密度的增加而增加。特别是，当阻抗测量结果显示为奈奎斯特图时，表示有效电导率的 x 轴截距与抗压强度成正比。此外，还选择了等效电路来解释水泥骨料与阻抗之间的相关性。结果发现，抗压强度随着水泥骨料中连续孔隙中电解质电阻值的增加而增加。而 ITZ 中形成的孔隙会影响该值。此外，还获得了不同骨料在 ITZ 处的电阻值，发现电阻值与 ITZ 的 SEM 图像预测结果一致，并与混凝土强度相关。所提出的方法可用于根据骨料的不同轻松确定水泥的强度。
{"title":"Correlations between the Impedance and Compressive Strength of Hardened Cement According to the Aggregate Type","authors":"Hojin Kim, Jinju Kim, Sungyu Park, Je Hyun Bae","doi":"10.33961/jecst.2023.00773","DOIUrl":"https://doi.org/10.33961/jecst.2023.00773","url":null,"abstract":": To date, methods used to assess the interfacial transition zone (ITZ), which represents the boundary between the aggregate and paste inside concretes, have primarily relied on destructive tests, and non-destructive tests has received little attention until recently. This study assessed the interfaces of concretes with lightweight aggregates based on electrochemical impedance spectroscopy (EIS) for high-strength concretes and examined the possibility of estimating the compressive strength of concretes through non-destructive testing using EIS. The experimental results revealed that the impedance of the hardened cement increased with increasing compressive strength and aggregate density. In particular, when the results of impedance measurement were displayed as a Nyquist plot, the intercept of the x-axis depicting the effective conductivity was proportional to the compressive strength. Furthermore, an equivalent circuit was selected to interpret the correlation between cement aggregates and impedance. Consequently, the compressive strength was found to increase with the value of the resistances of the electrolyte filled in continuous pores in the cement aggregate. And, the pores formed in the ITZ affect this value. The resistance at the ITZ for different aggregates was also obtained, and it was found that the resistance was consistent with the results predicted by SEM images of the ITZ and correlated with the strength of the concretes. The proposed method can be used as a way to easily determine the strength of cement according to differences in aggregate.","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"38 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140435908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-14DOI: 10.33961/jecst.2023.00731
Chao Wang, Yongqiang Li, Junmin Wan, Yi Hu, Yi Huang
{"title":"Electrochemical Degradation of Textile Effluent Using PbO2 Electrode in Tube Electrolyzer","authors":"Chao Wang, Yongqiang Li, Junmin Wan, Yi Hu, Yi Huang","doi":"10.33961/jecst.2023.00731","DOIUrl":"https://doi.org/10.33961/jecst.2023.00731","url":null,"abstract":"","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"9 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139777304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-14DOI: 10.33961/jecst.2023.00731
Chao Wang, Yongqiang Li, Junmin Wan, Yi Hu, Yi Huang
{"title":"Electrochemical Degradation of Textile Effluent Using PbO2 Electrode in Tube Electrolyzer","authors":"Chao Wang, Yongqiang Li, Junmin Wan, Yi Hu, Yi Huang","doi":"10.33961/jecst.2023.00731","DOIUrl":"https://doi.org/10.33961/jecst.2023.00731","url":null,"abstract":"","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"778 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139836934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-13DOI: 10.33961/jecst.2024.00038
Seong-Ju Sim, Bong-Soo Jin, Jun-Ho Park, Hyun-Soo Kim
{"title":"A study on long-term cycling performance by external pressure change for pouch-type lithium metal batteries","authors":"Seong-Ju Sim, Bong-Soo Jin, Jun-Ho Park, Hyun-Soo Kim","doi":"10.33961/jecst.2024.00038","DOIUrl":"https://doi.org/10.33961/jecst.2024.00038","url":null,"abstract":"","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"29 35","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139782178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-06DOI: 10.33961/jecst.2023.00927
Hoang Anh Nguyen, Thi Nam Pham, L. Huynh, Tran Ha Trang Nguyen, Viet Hai Le, Nguyen Thai Hoang, Thi Thom Nguyen, Thi Thu Huyen Nguyen, Dai Lam Tran, Thi Mai Thanh Dinh
{"title":"The effect of the ratio of C45 carbon to graphene on the Si/C composite materials used as anode for lithium-ion batteries","authors":"Hoang Anh Nguyen, Thi Nam Pham, L. Huynh, Tran Ha Trang Nguyen, Viet Hai Le, Nguyen Thai Hoang, Thi Thom Nguyen, Thi Thu Huyen Nguyen, Dai Lam Tran, Thi Mai Thanh Dinh","doi":"10.33961/jecst.2023.00927","DOIUrl":"https://doi.org/10.33961/jecst.2023.00927","url":null,"abstract":"","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"14 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139860629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-06DOI: 10.33961/jecst.2023.00927
Hoang Anh Nguyen, Thi Nam Pham, L. Huynh, Tran Ha Trang Nguyen, Viet Hai Le, Nguyen Thai Hoang, Thi Thom Nguyen, Thi Thu Huyen Nguyen, Dai Lam Tran, Thi Mai Thanh Dinh
{"title":"The effect of the ratio of C45 carbon to graphene on the Si/C composite materials used as anode for lithium-ion batteries","authors":"Hoang Anh Nguyen, Thi Nam Pham, L. Huynh, Tran Ha Trang Nguyen, Viet Hai Le, Nguyen Thai Hoang, Thi Thom Nguyen, Thi Thu Huyen Nguyen, Dai Lam Tran, Thi Mai Thanh Dinh","doi":"10.33961/jecst.2023.00927","DOIUrl":"https://doi.org/10.33961/jecst.2023.00927","url":null,"abstract":"","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"134 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139800835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-02DOI: 10.33961/jecst.2023.00752
Hyeong-Jin Park, Seong-Ju Sim, Bong-Soo Jin, Hyun-Soo Kim
{"title":"Introducing an Efficient and Eco-Friendly Spray-Drying Process for the Synthesis of NCM Precursor for Lithium-ion Batteries","authors":"Hyeong-Jin Park, Seong-Ju Sim, Bong-Soo Jin, Hyun-Soo Kim","doi":"10.33961/jecst.2023.00752","DOIUrl":"https://doi.org/10.33961/jecst.2023.00752","url":null,"abstract":"","PeriodicalId":506716,"journal":{"name":"Journal of Electrochemical Science and Technology","volume":"61 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139810830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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