Pub Date : 2025-01-25DOI: 10.1007/s12678-024-00925-3
Mingshuai Guo, Yonglei Xin, Likun Xu, Lili Xue, Tigang Duan, Rongrong Zhao, Shuai Zhou, Li Li
The impact of TaOx interlayers prepared by thermal decomposition using different solvents (ethanol, n-butanol, ethylene glycol) on Ti/TaOx/IrO2-Ta2O5 electrodes has been investigated using analytical methods such as SEM, XRD, XPS, FIB-TEM, and electrochemical techniques. The results demonstrate that the synthesized TaOx interlayers are mainly composed of amorphous TaOx and a little of Ta2O5 crystallites with a thin TiOx sublayer on titanium substrate. The solvents affect the TaOx loadings and fractions of surface cracks due to the difference in viscosity. The Ti/TaOx/IrO2-Ta2O5 electrode with the interlayer prepared using ethylene glycol has the largest electrochemically active surface area and electrocatalytic activity for oxygen evolution reaction, while the electrode with the TaOx interlayer formed using n-butanol as solvent presents highest stability.
{"title":"Effect of TaOx Interlayer Prepared with Different Solvent on Microstructure and Properties of Ti/TaOx/IrO2-Ta2O5 Electrode","authors":"Mingshuai Guo, Yonglei Xin, Likun Xu, Lili Xue, Tigang Duan, Rongrong Zhao, Shuai Zhou, Li Li","doi":"10.1007/s12678-024-00925-3","DOIUrl":"10.1007/s12678-024-00925-3","url":null,"abstract":"<div><p>The impact of TaO<sub>x</sub> interlayers prepared by thermal decomposition using different solvents (ethanol, n-butanol, ethylene glycol) on Ti/TaO<sub>x</sub>/IrO<sub>2</sub>-Ta<sub>2</sub>O<sub>5</sub> electrodes has been investigated using analytical methods such as SEM, XRD, XPS, FIB-TEM, and electrochemical techniques. The results demonstrate that the synthesized TaO<sub>x</sub> interlayers are mainly composed of amorphous TaO<sub>x</sub> and a little of Ta<sub>2</sub>O<sub>5</sub> crystallites with a thin TiO<sub>x</sub> sublayer on titanium substrate. The solvents affect the TaO<sub>x</sub> loadings and fractions of surface cracks due to the difference in viscosity. The Ti/TaO<sub>x</sub>/IrO<sub>2</sub>-Ta<sub>2</sub>O<sub>5</sub> electrode with the interlayer prepared using ethylene glycol has the largest electrochemically active surface area and electrocatalytic activity for oxygen evolution reaction, while the electrode with the TaO<sub>x</sub> interlayer formed using n-butanol as solvent presents highest stability.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":535,"journal":{"name":"Electrocatalysis","volume":"16 3","pages":"414 - 426"},"PeriodicalIF":2.7,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-24DOI: 10.1007/s12678-024-00920-8
Zifan Wu, Runbin Duan, Jiali Cui, Cuiping Ye, Shichao Zhang, Shaohui Yan
It is well known that direct alcohol fuel cells (DAFCs) are ideal power sources for portable equipment and electric vehicles, due to the advantages of alcohol, such as renewability, safety, high energy density and ease of storage and transportation. However, their applications are limited by the scarce resources and poor operational durability of commercial Pt-based catalysts. Consequently, numerous alternative catalysts have been reported over the past decades, including MOF (Metal–Organic Framework) materials, M–N-C (M = transition metal atom) single-atom catalysts, Pd-based catalysts and others. Among these, Pd-based catalysts exhibit high electro-activity for both alcohol electro-oxidations and oxygen reduction reactions, particularly for ethanol electro-oxidation. Significant efforts have been made to enhance the activity and durability of Pd-based catalysts for use in DAFCs. Despite these efforts, commercialization is progressing slowly. Therefore, advancing the commercial application of DAFCs has become a pressing issue for both enterprises and researchers. Exploring novel Pd-based catalysts with exceptionally high activity and stability is likely to address this challenge. This review summarizes the classifications, synthesis methods, current research status and prospects of Pd-based catalysts to provide effective research directions and methods for improving their investigation.
Graphical Abstract
众所周知，直接酒精燃料电池（DAFCs）是便携式设备和电动汽车的理想电源，因为酒精具有可再生、安全、高能量密度和易于储存和运输等优点。然而，它们的应用受到资源稀缺和商业pt基催化剂的使用耐久性差的限制。因此，在过去的几十年中，已经报道了许多替代催化剂，包括MOF（金属有机框架）材料，M - n - c （M =过渡金属原子）单原子催化剂，pd基催化剂等。其中，钯基催化剂在醇电氧化和氧还原反应中均表现出较高的电活性，特别是在乙醇电氧化反应中。为了提高钯基催化剂在DAFCs中的活性和耐久性，人们做了大量的工作。尽管做出了这些努力，但商业化进展缓慢。因此，推进DAFCs的商业应用已成为企业和研究人员迫切需要解决的问题。探索具有极高活性和稳定性的新型钯基催化剂可能会解决这一挑战。本文综述了钯基催化剂的分类、合成方法、研究现状及展望，以期为进一步完善钯基催化剂的研究提供有效的研究方向和方法。图形抽象
{"title":"An Overview of the Pd Based Electrocatalysts Utilized in Direct Alcohol Fuel Cells","authors":"Zifan Wu, Runbin Duan, Jiali Cui, Cuiping Ye, Shichao Zhang, Shaohui Yan","doi":"10.1007/s12678-024-00920-8","DOIUrl":"10.1007/s12678-024-00920-8","url":null,"abstract":"<div><p>It is well known that direct alcohol fuel cells (DAFCs) are ideal power sources for portable equipment and electric vehicles, due to the advantages of alcohol, such as renewability, safety, high energy density and ease of storage and transportation. However, their applications are limited by the scarce resources and poor operational durability of commercial Pt-based catalysts. Consequently, numerous alternative catalysts have been reported over the past decades, including MOF (Metal–Organic Framework) materials, M–N-C (M = transition metal atom) single-atom catalysts, Pd-based catalysts and others. Among these, Pd-based catalysts exhibit high electro-activity for both alcohol electro-oxidations and oxygen reduction reactions, particularly for ethanol electro-oxidation. Significant efforts have been made to enhance the activity and durability of Pd-based catalysts for use in DAFCs. Despite these efforts, commercialization is progressing slowly. Therefore, advancing the commercial application of DAFCs has become a pressing issue for both enterprises and researchers. Exploring novel Pd-based catalysts with exceptionally high activity and stability is likely to address this challenge. This review summarizes the classifications, synthesis methods, current research status and prospects of Pd-based catalysts to provide effective research directions and methods for improving their investigation.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":535,"journal":{"name":"Electrocatalysis","volume":"16 2","pages":"197 - 223"},"PeriodicalIF":2.7,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-22DOI: 10.1007/s12678-025-00929-7
Nguyen Ngoc Nghia, Nguyen Thi Kim Phuong, Bui The Huy
Electrocatalysts play a critical role in various energy conversion and storage technologies, including fuel cells, electrolyzers, and batteries. However, finding the optimal electrocatalyst for a specific reaction is a challenging and time-consuming task, as there are many possible materials and compositions to explore. Bipolar electrode (BPE) arrays are a promising technique for high-throughput screening of electrocatalysts, as they allow simultaneous testing of multiple candidates under identical conditions without external wiring. This mini-review summarizes recent advancements and current challenges in developing and applying BPE arrays for electrocatalyst screening. We discuss the design and fabrication of BPE arrays, the methods for depositing electrocatalysts on BPEs. We also highlight some examples of BPE arrays for screening electrocatalysts for various reactions, such as oxygen reduction, hydrogen evolution, and organic oxidation. We conclude with some perspectives and suggestions for future research directions in this emerging field.
{"title":"High-Throughput Electrocatalyst Screening Using Bipolar Electrode Arrays: A Mini Review","authors":"Nguyen Ngoc Nghia, Nguyen Thi Kim Phuong, Bui The Huy","doi":"10.1007/s12678-025-00929-7","DOIUrl":"10.1007/s12678-025-00929-7","url":null,"abstract":"<div><p>Electrocatalysts play a critical role in various energy conversion and storage technologies, including fuel cells, electrolyzers, and batteries. However, finding the optimal electrocatalyst for a specific reaction is a challenging and time-consuming task, as there are many possible materials and compositions to explore. Bipolar electrode (BPE) arrays are a promising technique for high-throughput screening of electrocatalysts, as they allow simultaneous testing of multiple candidates under identical conditions without external wiring. This mini-review summarizes recent advancements and current challenges in developing and applying BPE arrays for electrocatalyst screening. We discuss the design and fabrication of BPE arrays, the methods for depositing electrocatalysts on BPEs. We also highlight some examples of BPE arrays for screening electrocatalysts for various reactions, such as oxygen reduction, hydrogen evolution, and organic oxidation. We conclude with some perspectives and suggestions for future research directions in this emerging field.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":535,"journal":{"name":"Electrocatalysis","volume":"16 3","pages":"361 - 378"},"PeriodicalIF":2.7,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-10DOI: 10.1007/s12678-025-00927-9
İzzet Koçak, Fatih Pekdemir
A platinum-based complex molecule, [PtLCl]Cl (Pt-L), featuring a tridentate ligand (L = 2,6-bis(benzimidazol-2-yl)-4-hydroxypyridine) was synthesized. Subsequently, Pt-L was successfully bonded to amine-terminated Fe3O4NP, and MWCNTs were incorporated into the modified Fe3O4 surface. The resulting electrode was shown to possess outstanding electrocatalytic activity for detecting H2O2 and NADH, characterized by enhanced cathodic or anodic peak responses and favorable shifts in the reduction or oxidation peak potentials for both analytes. The sensing platform demonstrated excellent electrochemical performance in non-enzymatic measurements of H2O2 and NADH, achieving notably low detection limits of 0.017 µmol L−1 for H2O2 and 0.113 µmol L−1 for NADH. These findings were acquired within the concentration range of 10 to 500 µmol L−1, indicating the linear portion of the calibration graphs obtained in the concentration ranges of 10 to 5000 µmol L−1 for H₂O₂ and 10 to 25,000 µmol L−1 for NADH, which exhibited exponential behavior for both analytes. The developed sensor displayed high responsiveness, long-lasting stability, and requisite interference, rendering it suitable for routine detection of H2O2 and NADH in biological specimens.
{"title":"Enzyme Mimic Behavior of Platinum(II) Complex with Tridentate Ligand—Fe3O4—MWCNT Nanocomposite for the Electrochemical Detection of H2O2 and NADH","authors":"İzzet Koçak, Fatih Pekdemir","doi":"10.1007/s12678-025-00927-9","DOIUrl":"10.1007/s12678-025-00927-9","url":null,"abstract":"<div><p>A platinum-based complex molecule, [PtLCl]Cl (Pt-L), featuring a tridentate ligand (<i>L</i> = 2,6-bis(benzimidazol-2-yl)-4-hydroxypyridine) was synthesized. Subsequently, Pt-L was successfully bonded to amine-terminated Fe<sub>3</sub>O<sub>4</sub>NP, and MWCNTs were incorporated into the modified Fe<sub>3</sub>O<sub>4</sub> surface. The resulting electrode was shown to possess outstanding electrocatalytic activity for detecting H<sub>2</sub>O<sub>2</sub> and NADH, characterized by enhanced cathodic or anodic peak responses and favorable shifts in the reduction or oxidation peak potentials for both analytes. The sensing platform demonstrated excellent electrochemical performance in non-enzymatic measurements of H<sub>2</sub>O<sub>2</sub> and NADH, achieving notably low detection limits of 0.017 µmol L<sup>−1</sup> for H<sub>2</sub>O<sub>2</sub> and 0.113 µmol L<sup>−1</sup> for NADH. These findings were acquired within the concentration range of 10 to 500 µmol L<sup>−1</sup>, indicating the linear portion of the calibration graphs obtained in the concentration ranges of 10 to 5000 µmol L<sup>−1</sup> for H₂O₂ and 10 to 25,000 µmol L<sup>−1</sup> for NADH, which exhibited exponential behavior for both analytes. The developed sensor displayed high responsiveness, long-lasting stability, and requisite interference, rendering it suitable for routine detection of H<sub>2</sub>O<sub>2</sub> and NADH in biological specimens.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":535,"journal":{"name":"Electrocatalysis","volume":"16 3","pages":"391 - 403"},"PeriodicalIF":2.7,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-09DOI: 10.1007/s12678-025-00926-w
Jülide Hazal Özdemir, Aydın Haşimoğlu, Hüseyin Elçiçek, Oğuz Kaan Özdemir, Nuri Akkaş
PEM fuel cell technologies have emerged as promising candidates for advancing sustainable energy solutions, primarily due to their exceptional efficiency and minimal environmental impact. However, the widespread commercialization of fuel cells is hindered by the high cost and limited availability of platinum catalysts, which play a critical role in facilitating electrochemical reactions. This research mainly focused on investigating innovative solutions aiming to mitigate platinum loading while simultaneously preserving or potentially enhancing their performance. To this end, the impact of two distinct surfactants, Tween 40 and Tween 80, was examined to assess their influence on the synthesis and characteristics of platinum nanoparticles immobilized on carbon supports. Subsequently, their electrochemical activities were compared. The catalysts were synthesized using the polyol method with the incorporation of surfactants, and their performance was compared with that of Pt/C catalysts without surfactants. TGA analysis indicated a significant reduction of approximately 12% in the Pt content of the catalyst synthesized using Tween 80 surfactant. However, CV analysis revealed a remarkable increase of 85% in the ECSA for the same catalyst. Furthermore, significant improvements in the performance of this catalyst were also observed in the single-cell test setup. The high performance achieved with a lower Pt content in the catalyst layer highlights its potential for large-scale commercialization.
{"title":"Production of Highly Efficient Pt/C for PEM Fuel Cell Applications","authors":"Jülide Hazal Özdemir, Aydın Haşimoğlu, Hüseyin Elçiçek, Oğuz Kaan Özdemir, Nuri Akkaş","doi":"10.1007/s12678-025-00926-w","DOIUrl":"10.1007/s12678-025-00926-w","url":null,"abstract":"<div><p>PEM fuel cell technologies have emerged as promising candidates for advancing sustainable energy solutions, primarily due to their exceptional efficiency and minimal environmental impact. However, the widespread commercialization of fuel cells is hindered by the high cost and limited availability of platinum catalysts, which play a critical role in facilitating electrochemical reactions. This research mainly focused on investigating innovative solutions aiming to mitigate platinum loading while simultaneously preserving or potentially enhancing their performance. To this end, the impact of two distinct surfactants, Tween 40 and Tween 80, was examined to assess their influence on the synthesis and characteristics of platinum nanoparticles immobilized on carbon supports. Subsequently, their electrochemical activities were compared. The catalysts were synthesized using the polyol method with the incorporation of surfactants, and their performance was compared with that of Pt/C catalysts without surfactants. TGA analysis indicated a significant reduction of approximately 12% in the Pt content of the catalyst synthesized using Tween 80 surfactant. However, CV analysis revealed a remarkable increase of 85% in the ECSA for the same catalyst. Furthermore, significant improvements in the performance of this catalyst were also observed in the single-cell test setup. The high performance achieved with a lower Pt content in the catalyst layer highlights its potential for large-scale commercialization.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":535,"journal":{"name":"Electrocatalysis","volume":"16 3","pages":"379 - 390"},"PeriodicalIF":2.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Due to its layered structure and appropriate electronic configuration, two-dimensional MoS2 has been considered a reliable and inexpensive electrocatalyst and electrode material for the oxygen reduction reaction (ORR). Additionally, the MoS2 and reduced graphene oxide (rGO) structure can act as a good host for other nano-catalysts. However, the catalytic activity of pristine MoS2 is not as effective as the industrial targeted values. In this work, nickel-MoS2 (Ni/MoS2) and Ni/MoS2-rGO composites are synthesized and evaluated as catalysts for ORR at the cathode. Electrochemical studies using a rotating disk electrode system confirmed that the as-synthesized catalyst exhibits good electrocatalytic activity to ORR in alkaline media (0.1 M KOH) and followed the desirable 4-electron transfer process. Ni/MoS2-rGO composite displays a current density of − 11.1 mA/cm2 and half-wave and onset potentials of 0.74 V and 0.87 V, respectively, at 2400 rpm, whereas the bare MoS2 shows the values of limiting current density, half-wave potential, and onset potential of − 5.8 mA/cm2, 0.61 V, and 0.79 V, respectively. Numerous highly active Mo sites, high conductivity, and high specific surface area in MoS2-rGO make it a novel catalyst material for ORR. Ni further enhances conductivity and is involved in electrochemical reactions. The onset potential slightly shifts towards the lower value after the potential cycling, whereas the limiting current density decreases by ≈9.0% for Ni/MoS2-rGO, which shows its good stability in alkaline media. Therefore, Ni/MoS2-rGO composite can be a good candidate for electrode catalyst material for alkaline fuel cells.
{"title":"Enhancement in ORR Performance by Compositing Ni-Decorated MoS2 with rGO for Alkaline Fuel Cells","authors":"Monika Shrivastav, Harshit Galriya, Ripsa Rani Nayak, Navneet Kumar Gupta, Mukesh Kumar, Rajnish Dhiman","doi":"10.1007/s12678-024-00921-7","DOIUrl":"10.1007/s12678-024-00921-7","url":null,"abstract":"<div><p>Due to its layered structure and appropriate electronic configuration, two-dimensional MoS<sub>2</sub> has been considered a reliable and inexpensive electrocatalyst and electrode material for the oxygen reduction reaction (ORR). Additionally, the MoS<sub>2</sub> and reduced graphene oxide (rGO) structure can act as a good host for other nano-catalysts. However, the catalytic activity of pristine MoS<sub>2</sub> is not as effective as the industrial targeted values. In this work, nickel-MoS<sub>2</sub> (Ni/MoS<sub>2</sub>) and Ni/MoS<sub>2</sub>-rGO composites are synthesized and evaluated as catalysts for ORR at the cathode. Electrochemical studies using a rotating disk electrode system confirmed that the as-synthesized catalyst exhibits good electrocatalytic activity to ORR in alkaline media (0.1 M KOH) and followed the desirable 4-electron transfer process. Ni/MoS<sub>2</sub>-rGO composite displays a current density of − 11.1 mA/cm<sup>2</sup> and half-wave and onset potentials of 0.74 V and 0.87 V, respectively, at 2400 rpm, whereas the bare MoS<sub>2</sub> shows the values of limiting current density, half-wave potential, and onset potential of − 5.8 mA/cm<sup>2</sup>, 0.61 V, and 0.79 V, respectively. Numerous highly active Mo sites, high conductivity, and high specific surface area in MoS<sub>2</sub>-rGO make it a novel catalyst material for ORR. Ni further enhances conductivity and is involved in electrochemical reactions. The onset potential slightly shifts towards the lower value after the potential cycling, whereas the limiting current density decreases by ≈9.0% for Ni/MoS<sub>2</sub>-rGO, which shows its good stability in alkaline media. Therefore, Ni/MoS<sub>2</sub>-rGO composite can be a good candidate for electrode catalyst material for alkaline fuel cells.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":535,"journal":{"name":"Electrocatalysis","volume":"16 2","pages":"349 - 359"},"PeriodicalIF":2.7,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1007/s12678-024-00924-4
Dawit Tibebu Haile, Teketel Yohannes, Getachew Adam Workneh
Recently, transition metal-based electrocatalysts have shown significant promise in promoting the oxygen evolution reaction (OER) as a result of their ample availability, tunable electronic properties, and catalytic capabilities. This study presents the synthesis of a transition metal-based electrocatalyst, featuring Co and Ni nanoparticles grown on Ti foil (CoNi@Ti). These nanoparticles are doped with Mn and Fe using with single-step in-situ chronoamperometry (CA) electrodeposition technique, resulting in the production of the Fe-MnCoNi@Ti nano-flower material. The results show that the Fe-MnCoNi@Ti nano-flower, with an overpotential of 261.6 mV, is an efficient electrocatalytic system for OER, achieving 10 mA cm−2 and a Tafel slope of 114.3 mV dec−1 in alkaline media. The comparison of the electrocatalytic performance of Fe-MnCoNi@Ti with other materials prepared in the same electrodeposition techniques and with the state-of-the-art materials indicated that our nano-flower material has comparable performance on its electrocatalytic properties for OER. In addition, the Turnover frequency (TOF) value highlights the high intrinsic activity of Fe-MnCoNi@Ti in catalyzing the OER. The stability test is also carried out by applying an overpotential of 400 mV with respect to the OER for 12 h of CA run, and it is found that Fe-MnCoNi@Ti has good stability for OER in alkaline conditions. The experimental results indicate that decorating Coniston nano-flower with Fe and Mn as dopant materials via electrodeposition technique is a simple one-step process, which led to better electrocatalytic performance of the material for the OER in alkaline media.
Graphical Abstract
最近，过渡金属基电催化剂由于其丰富的可用性、可调的电子性质和催化能力，在促进析氧反应（OER）方面表现出了显著的前景。本研究提出了一种过渡金属基电催化剂的合成，其特征是在钛箔上生长的Co和Ni纳米颗粒（CoNi@Ti）。利用单步原位计时安培（CA）电沉积技术，将这些纳米颗粒掺杂Mn和Fe，从而制备出Fe-MnCoNi@Ti纳米花材料。结果表明，Fe-MnCoNi@Ti纳米花的过电位为261.6 mV，是一种高效的OER电催化体系，在碱性介质中可达到10 mA cm−2，Tafel斜率为114.3 mV dec−1。将Fe-MnCoNi@Ti的电催化性能与采用相同电沉积技术制备的其他材料进行比较，并与最先进的材料进行比较，表明我们的纳米花材料在OER的电催化性能上具有相当的性能。此外，转换频率（TOF）值突出了Fe-MnCoNi@Ti在催化OER方面的高内在活性。在CA运行的12小时内，对OER施加400 mV的过电位进行了稳定性测试，发现Fe-MnCoNi@Ti在碱性条件下对OER具有良好的稳定性。实验结果表明，采用电沉积技术以Fe和Mn作为掺杂材料装饰Coniston纳米花是一种简单的一步工艺，使得该材料在碱性介质中具有较好的OER电催化性能。图形抽象
{"title":"Single-Step Electrochemical Deposition of Transition Metal-Doped CoNi@Ti Nano-Flowers for Enhanced Oxygen Evolution Reaction","authors":"Dawit Tibebu Haile, Teketel Yohannes, Getachew Adam Workneh","doi":"10.1007/s12678-024-00924-4","DOIUrl":"10.1007/s12678-024-00924-4","url":null,"abstract":"<div><p>Recently, transition metal-based electrocatalysts have shown significant promise in promoting the oxygen evolution reaction (OER) as a result of their ample availability, tunable electronic properties, and catalytic capabilities. This study presents the synthesis of a transition metal-based electrocatalyst, featuring Co and Ni nanoparticles grown on Ti foil (CoNi@Ti). These nanoparticles are doped with Mn and Fe using with single-step in-situ chronoamperometry (CA) electrodeposition technique, resulting in the production of the Fe-MnCoNi@Ti nano-flower material. The results show that the Fe-MnCoNi@Ti nano-flower, with an overpotential of 261.6 mV, is an efficient electrocatalytic system for OER, achieving 10 mA cm<sup>−2</sup> and a Tafel slope of 114.3 mV dec<sup>−1</sup> in alkaline media. The comparison of the electrocatalytic performance of Fe-MnCoNi@Ti with other materials prepared in the same electrodeposition techniques and with the state-of-the-art materials indicated that our nano-flower material has comparable performance on its electrocatalytic properties for OER. In addition, the Turnover frequency (TOF) value highlights the high intrinsic activity of Fe-MnCoNi@Ti in catalyzing the OER. The stability test is also carried out by applying an overpotential of 400 mV with respect to the OER for 12 h of CA run, and it is found that Fe-MnCoNi@Ti has good stability for OER in alkaline conditions. The experimental results indicate that decorating Coniston nano-flower with Fe and Mn as dopant materials via electrodeposition technique is a simple one-step process, which led to better electrocatalytic performance of the material for the OER in alkaline media.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":535,"journal":{"name":"Electrocatalysis","volume":"16 2","pages":"337 - 348"},"PeriodicalIF":2.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-26DOI: 10.1007/s12678-024-00922-6
Deepika Choudhary, Preeti Mahto, Vivek Kumar, Ritu Bala, Rajnish Dhiman
Zn-ion batteries (ZIBs) are gaining attention due to their low cost, high capacity and efficiency, and strong cycling stability; nevertheless, further research is required to establish suitable cathode materials for the intercalation of Zn ions. Due to the layered structure, vanadium oxide–based materials are considered promising cathode materials of ZIB devices using gel polymer electrolytes (GPEs). The GPEs are considered a good alternative to liquid electrolytes due to their flexibility, leakage-free nature, and reduced Zn corrosion in Zn-based batteries. This work presents a carboxymethylcellulose and polyvinyl alcohol polymer matrix-based gel polymer electrolyte for applications in ZIBs for the first time. The polymer matrix shows an uptake of 150 wt% after immersion in 2 M ZnSO4 electrolyte solution for 50 h. The as synthesized GPE has an ionic conductivity of 0.6 × 10−2 cm−1Ω−1 and a thickness of 120 µm. The electrochemical results of the fabricated ZIB device fabricated using V3O7.H2O cathode material exhibit a high specific capacity of 505 mAh/g at 0.1 A/g current density.
Graphical Abstract
锌离子电池因其成本低、容量大、效率高、循环稳定性强等优点而备受关注；然而，建立合适的锌离子插层正极材料仍需进一步研究。由于其层状结构，氧化钒基材料被认为是使用凝胶聚合物电解质（gpe）的ZIB器件极具前景的正极材料。gpe被认为是液体电解质的一个很好的替代品，因为它具有灵活性，无泄漏的性质，并且在锌基电池中减少了锌的腐蚀。本文首次提出了一种应用于ZIBs的羧甲基纤维素和聚乙烯醇聚合物基质凝胶聚合物电解质。在2 M ZnSO4电解质溶液中浸泡50 h后，聚合物基体的吸收率为150 wt%。合成的GPE离子电导率为0.6 × 10−2 cm−1Ω−1，厚度为120µM。研究了用V3O7制备的ZIB器件的电化学性能。在0.1 a /g电流密度下，H2O阴极材料的比容量高达505 mAh/g。图形抽象
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Pub Date : 2024-12-24DOI: 10.1007/s12678-024-00919-1
Milica G. Košević, Nebojša D. Nikolić, Jelena D. Lović
A bimetallic Sb-Pd electrocatalyst was prepared through a versatile two-step electrodeposition method using chronopotentiometry, i.e., a controlled amount of Sb was electrodeposited onto glassy carbon (GC) electrode followed by electrodeposition of Pd to obtain desired Sb-Pd ratio. The synthesized electrocatalyst can be used as an anode catalyst for the methanol oxidation reaction (MOR), a prime fuel for direct methanol fuel cells (DEFCs). A morphological analysis of the Sb, Pd, and Sb-Pd electrocatalysts was performed by scanning electron microscopy (SEM) technique. The electrochemical properties of the Pd and Sb-Pd catalysts were evaluated using cyclic voltammetry (CV) and chronoamperometry (CA) in an alkaline electrolyte containing Na+ or Li+ cations. Compared to Pd alone, the Sb-Pd catalyst showed a twofold increase in peak current density and improved MOR kinetics. Both investigated catalysts exhibited higher poisoning tolerance in the solution containing Na+, implying that the product distribution in MOR depends on the alkali metal cation of the supporting electrolyte. The peak current of MOR at Pd and Sb‒Pd catalysts in the solution with Li+ cations is 1.4 times higher compared to the values obtained in the solution with Na+ cations, indicating the impact of the nature of alkali metal cations which arises from the formation of OHad ‒ cation clusters and the electronic interaction between COad and OHad ‒ cation clusters. The presence of Sb in the structure of the bimetallic catalyst provides a lower susceptibility to the poisoning and consequently enhances MOR performances regarding the Pd catalyst.
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Pub Date : 2024-12-02DOI: 10.1007/s12678-024-00918-2
Ersan Turunc, Ahmet Soner Ulger, Riza Binzet
In this study, a simple, cost-effective and eco-friendly method was performed for the production of silver nanoparticle decorated reduced graphene oxide (rGO-Ag) nanocomposite using Onosma bracteosa leaf extract as reducing and stabilizing agent. The structure of the synthesized rGO-Ag nanocomposite was characterized by UV–Vis, XRD, SEM, TEM, EDX, and XPS. The synthesized rGO-Ag nanocomposite was used to fabricate an electrochemical sensor (rGO-Ag@GCE) for the determination of hydrogen peroxide. Electrochemical reduction of hydrogen peroxide was performed using DPV on rGO-Ag@GCE in 0.1 M PBS. The rGO-Ag@GCE exhibited good response in the linear concentration range of 25 µM to 800 µM, with a LOD of 0.11 µM. Amperometric measurements showed that the prepared sensor did not have a significant response to interfering species. Moreover, analysis of real samples demonstrated the potential of rGO-Ag@GCE as an electrochemical sensor for detecting hydrogen peroxide in commercial milk samples.
Graphical Abstract
本研究采用一种简单、经济、环保的方法，以小榄叶提取物为还原剂和稳定剂，制备纳米银修饰的还原性氧化石墨烯（rGO-Ag）纳米复合材料。采用UV-Vis、XRD、SEM、TEM、EDX和XPS对合成的氧化石墨烯-银纳米复合材料进行了结构表征。将合成的氧化石墨烯-银纳米复合材料用于制备过氧化氢的电化学传感器（rGO-Ag@GCE）。在0.1 M PBS中，利用DPV在rGO-Ag@GCE上进行了过氧化氢的电化学还原。rGO-Ag@GCE在25µM ~ 800µM的线性浓度范围内表现出良好的响应，LOD为0.11µM。安培测量结果表明，所制备的传感器对干扰物质的响应不显著。此外，对实际样品的分析表明rGO-Ag@GCE作为一种电化学传感器在商业牛奶样品中检测过氧化氢的潜力。图形抽象
{"title":"Green Synthesis of Reduced Graphene Oxide Decorated with Silver Nanoparticles Using Onosma bracteosa Leaf Extract for Efficient Electrochemical Detection of Hydrogen Peroxide","authors":"Ersan Turunc, Ahmet Soner Ulger, Riza Binzet","doi":"10.1007/s12678-024-00918-2","DOIUrl":"10.1007/s12678-024-00918-2","url":null,"abstract":"<div><p>In this study, a simple, cost-effective and eco-friendly method was performed for the production of silver nanoparticle decorated reduced graphene oxide (rGO-Ag) nanocomposite using <i>Onosma bracteosa</i> leaf extract as reducing and stabilizing agent. The structure of the synthesized rGO-Ag nanocomposite was characterized by UV–Vis, XRD, SEM, TEM, EDX, and XPS. The synthesized rGO-Ag nanocomposite was used to fabricate an electrochemical sensor (rGO-Ag@GCE) for the determination of hydrogen peroxide. Electrochemical reduction of hydrogen peroxide was performed using DPV on rGO-Ag@GCE in 0.1 M PBS. The rGO-Ag@GCE exhibited good response in the linear concentration range of 25 µM to 800 µM, with a LOD of 0.11 µM. Amperometric measurements showed that the prepared sensor did not have a significant response to interfering species. Moreover, analysis of real samples demonstrated the potential of rGO-Ag@GCE as an electrochemical sensor for detecting hydrogen peroxide in commercial milk samples.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":535,"journal":{"name":"Electrocatalysis","volume":"16 2","pages":"303 - 317"},"PeriodicalIF":2.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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