Electrocatalysis最新文献

An Overview of the Pd Based Electrocatalysts Utilized in Direct Alcohol Fuel Cells

IF 2.7 4区化学

Electrocatalysis Pub Date : 2025-01-24 DOI: 10.1007/s12678-024-00920-8

Zifan Wu, Runbin Duan, Jiali Cui, Cuiping Ye, Shichao Zhang, Shaohui Yan

{"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}

引用次数: 0

Enhancement in ORR Performance by Compositing Ni-Decorated MoS2 with rGO for Alkaline Fuel Cells

IF 2.7 4区化学

Electrocatalysis Pub Date : 2025-01-04 DOI: 10.1007/s12678-024-00921-7

Monika Shrivastav, Harshit Galriya, Ripsa Rani Nayak, Navneet Kumar Gupta, Mukesh Kumar, Rajnish Dhiman

{"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}

引用次数: 0

Single-Step Electrochemical Deposition of Transition Metal-Doped CoNi@Ti Nano-Flowers for Enhanced Oxygen Evolution Reaction

IF 2.7 4区化学

Electrocatalysis Pub Date : 2024-12-27 DOI: 10.1007/s12678-024-00924-4

Dawit Tibebu Haile, Teketel Yohannes, Getachew Adam Workneh

{"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}

引用次数: 0

Gel-Polymer Electrolyte-Based High-Performance Zn-Ion Batteries with Vanadium-Oxide Cathode Material

IF 2.7 4区化学

Electrocatalysis Pub Date : 2024-12-26 DOI: 10.1007/s12678-024-00922-6

Deepika Choudhary, Preeti Mahto, Vivek Kumar, Ritu Bala, Rajnish Dhiman

{"title":"Gel-Polymer Electrolyte-Based High-Performance Zn-Ion Batteries with Vanadium-Oxide Cathode Material","authors":"Deepika Choudhary, Preeti Mahto, Vivek Kumar, Ritu Bala, Rajnish Dhiman","doi":"10.1007/s12678-024-00922-6","DOIUrl":"10.1007/s12678-024-00922-6","url":null,"abstract":"<div><p>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 ZnSO<sub>4</sub> electrolyte solution for 50 h. The as synthesized GPE has an ionic conductivity of 0.6 × 10<sup>−2</sup> cm<sup>−1</sup>Ω<sup>−1</sup> and a thickness of 120 µm. The electrochemical results of the fabricated ZIB device fabricated using V<sub>3</sub>O<sub>7</sub>.H<sub>2</sub>O cathode material exhibit a high specific capacity of 505 mAh/g at 0.1 A/g current density.</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":"328 - 336"},"PeriodicalIF":2.7,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184694","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}

引用次数: 0

A Versatile Electrodeposition Approach to Controlled Modification of Pd on Sb Towards Efficient Electrocatalysis for Application in Direct Methanol Fuel Cells

IF 2.7 4区化学

Electrocatalysis Pub Date : 2024-12-24 DOI: 10.1007/s12678-024-00919-1

Milica G. Košević, Nebojša D. Nikolić, Jelena D. Lović

{"title":"A Versatile Electrodeposition Approach to Controlled Modification of Pd on Sb Towards Efficient Electrocatalysis for Application in Direct Methanol Fuel Cells","authors":"Milica G. Košević, Nebojša D. Nikolić, Jelena D. Lović","doi":"10.1007/s12678-024-00919-1","DOIUrl":"10.1007/s12678-024-00919-1","url":null,"abstract":"<div><p>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<sup>+</sup> or Li<sup>+</sup> 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<sup>+</sup>, 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<sup>+</sup> cations is 1.4 times higher compared to the values obtained in the solution with Na<sup>+</sup> cations, indicating the impact of the nature of alkali metal cations which arises from the formation of OH<sub>ad</sub> ‒ cation clusters and the electronic interaction between CO<sub>ad</sub> and OH<sub>ad</sub> ‒ 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.</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":"318 - 327"},"PeriodicalIF":2.7,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184638","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}

引用次数: 0

Green Synthesis of Reduced Graphene Oxide Decorated with Silver Nanoparticles Using Onosma bracteosa Leaf Extract for Efficient Electrochemical Detection of Hydrogen Peroxide

IF 2.7 4区化学

Electrocatalysis Pub Date : 2024-12-02 DOI: 10.1007/s12678-024-00918-2

Ersan Turunc, Ahmet Soner Ulger, Riza Binzet

{"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}

引用次数: 0

Using PANI|In2O3 Composite for Indirect Electrochemical Detection of Diclofenac Sodium via Polyaniline Oxidation Peak

IF 2.7 4区化学

Electrocatalysis Pub Date : 2024-11-28 DOI: 10.1007/s12678-024-00914-6

Gulmira Rakhymbay, Florence Vacandio, Khaisa Avchukir

{"title":"Using PANI|In2O3 Composite for Indirect Electrochemical Detection of Diclofenac Sodium via Polyaniline Oxidation Peak","authors":"Gulmira Rakhymbay, Florence Vacandio, Khaisa Avchukir","doi":"10.1007/s12678-024-00914-6","DOIUrl":"10.1007/s12678-024-00914-6","url":null,"abstract":"<div><p>The unusual electrochemical, catalytic, and electronic properties of conductive polymer composites with metal oxides, owing to their synergistic effects, have attracted continued interest in the past decade for diverse applications in electroanalysis and electrocatalysis. Herein, we present a novel method for indirect determination of diclofenac (DCF) sodium using a PANI|In<sub>2</sub>O<sub>3</sub> composite. A glassy carbon electrode (GCE) modified with a thin PANI|In<sub>2</sub>O<sub>3</sub> layer was synthesized by cyclic voltammetry (CV) from a 0.3 M H<sub>2</sub>SO<sub>4</sub> solution. Electrochemical impedance spectroscopy (EIS) measurements demonstrated that the PANI|In<sub>2</sub>O<sub>3</sub> composite has a significantly higher R<sub>ct</sub> value 624.0 Ω than the pure polyaniline film (14.0 Ω). CVs of bare GCE demonstrated the irreversible oxidation of diclofenac, characterized by an anodic peak at a potential of 0.6 V. Differential pulse voltammograms (DPVs) of DCF on a GCE|PANI electrode showed two pronounced anodic peaks (<i>j</i><sub><i>pa</i></sub>), which were responsible for the electrochemical oxidation of polyaniline (I) and oxidation of DCF (II). Modification with In<sub>2</sub>O<sub>3</sub> dramatically decreased the current density of peak II by inhibiting the oxidation of DCF, and on the contrary, it increased the intensity of peak I tens of times. The GC|PANI|In<sub>2</sub>O<sub>3</sub> electrode can be used as an electrochemical sensor for the determination of diclofenac at low concentrations between 1 × 10<sup>–6</sup> M to 1 × 10<sup>–4</sup> M, and <i>j</i><sub><i>pa</i></sub> – <i>C</i><sub><i>DCF</i></sub> has a correlation coefficient of 0.95. The GC|PANI|In<sub>2</sub>O<sub>3</sub> material exhibited a limit of detection of 181 nM and a linear range of 1–100 µM for the DCF sensor.</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":"282 - 291"},"PeriodicalIF":2.7,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184808","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}

引用次数: 0

Application of Corn Oil Derived Carbon Nano-onions Using Flame Pyrolysis as Durable Catalyst Support for Polymer Electrolyte Membrane Fuel Cells

IF 2.7 4区化学

Electrocatalysis Pub Date : 2024-11-28 DOI: 10.1007/s12678-024-00916-4

Akshaya S. Nair, Rupali S. Mane, Neetu Jha, R. Imran Jafri

{"title":"Application of Corn Oil Derived Carbon Nano-onions Using Flame Pyrolysis as Durable Catalyst Support for Polymer Electrolyte Membrane Fuel Cells","authors":"Akshaya S. Nair, Rupali S. Mane, Neetu Jha, R. Imran Jafri","doi":"10.1007/s12678-024-00916-4","DOIUrl":"10.1007/s12678-024-00916-4","url":null,"abstract":"<div><p>The reliance of carbon black as catalyst support for Pt in PEM fuel cell has posed a major challenge in its durability as carbon blacks are highly prone to corrosion. As an alternative, CNTs, CNFs, and graphene are explored as catalyst support, however at the expense of tedious synthesis procedure and production cost. So to combat this issue, a facile flame pyrolysis route was adopted to produce carbon nano-onions using eco-friendly corn oil. Further modification in the carbon nano-onions exhibited better corrosion resistance in comparison to carbon black (Vulcan XC-72R). Also, a systematic approach was adopted towards developing a durable electrocatalyst which was designed to withstand harsh fuel cell operating conditions. The electrocatalyst was successfully analyzed using stringent standard testing protocols (< 40% ECSA loss). Among all the electrocatalyst studied, Pt/fOC exhibited only 37.1% loss in electrochemical active surface area (ECSA) after 5000 cycles, thus indicating its excellent durability. A full cell was also constructed with Pt/fOC as cathode electrocatalyst which showed a maximum power density of 365 mW cm<sup>−2</sup>, comparable to commercial Pt/C (367 mW cm<sup>−2</sup>). To the best of our knowledge, this is the first study on the application of corn oil derived carbon nano-onions as catalyst support for PEM fuel cells.</p></div>","PeriodicalId":535,"journal":{"name":"Electrocatalysis","volume":"16 2","pages":"292 - 302"},"PeriodicalIF":2.7,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184806","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}

引用次数: 0

Effect of Melamine on the Oxygen Reduction Reaction in the n(111)-(111) Series of Pt3Co

IF 2.7 4区化学

Electrocatalysis Pub Date : 2024-11-26 DOI: 10.1007/s12678-024-00915-5

Takuro Kamei, Masashi Nakamura, Nagahiro Hoshi

{"title":"Effect of Melamine on the Oxygen Reduction Reaction in the n(111)-(111) Series of Pt3Co","authors":"Takuro Kamei, Masashi Nakamura, Nagahiro Hoshi","doi":"10.1007/s12678-024-00915-5","DOIUrl":"10.1007/s12678-024-00915-5","url":null,"abstract":"<div><p>Enhancement of the oxygen reduction reaction (ORR) activity is an important subject for the development of fuel cells. In this study, we prepared the <i>n</i>(111)-(111) series of Pt<sub>3</sub>Co single crystal electrodes using an induction heating furnace and investigated the ORR in 0.1 M HClO<sub>4</sub> using the rotation disk electrode (RDE). The specific activity of the ORR (<i>j</i><sub>k</sub>) increased monotonously with increasing terrace width <i>n</i> on the <i>n</i>(111)-(111) series of Pt<sub>3</sub>Co, showing the highest activity on Pt<sub>3</sub>Co(111). The value of <i>j</i><sub>k</sub> of Pt<sub>3</sub>Co(111) was 59-fold higher than that of Pt(111) at 0.95 V(RHE). This trend was different from those of the same series of Pt, Pt<sub>3</sub>Co, and Pt<sub>3</sub>Ni reported previously. Furthermore, the ORR activity was improved on all electrodes by adding melamine to the electrolytic solution. Melamine was preferentially adsorbed at the terrace edge. Pt<sub>3</sub>Co(553) <i>n</i> = 5 showed the highest activity. The values of <i>j</i><sub>k</sub> at 0.95 V(RHE) were 23- and 3.3-fold higher than those of Pt(553) <i>n</i> = 5 and Pt<sub>3</sub>Co(553) <i>n</i> = 5 without melamine modification, respectively. The durability of Pt<sub>3</sub>Co(553) <i>n</i> = 5 with melamine was improved 8.0-fold.</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":"263 - 274"},"PeriodicalIF":2.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12678-024-00915-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Single-Step Hydrothermal Synthesis of HNO3 Exfoliated Graphite/Fe2O3 Composite for Methanol Oxidation in Acidic Media

IF 2.7 4区化学

Electrocatalysis Pub Date : 2024-11-26 DOI: 10.1007/s12678-024-00917-3

Shan Ahmed Khan, Aqsa Batool, Muhammad Salman

{"title":"Single-Step Hydrothermal Synthesis of HNO3 Exfoliated Graphite/Fe2O3 Composite for Methanol Oxidation in Acidic Media","authors":"Shan Ahmed Khan, Aqsa Batool, Muhammad Salman","doi":"10.1007/s12678-024-00917-3","DOIUrl":"10.1007/s12678-024-00917-3","url":null,"abstract":"<div><p>Methanol has potential to replace conventional fuels. But its popularity is hindered by lower kinetics of electrode reactions, lower surface area, CO poisoning of catalysts, and higher cost of platinum-based catalysts. It is rare to find electrocatalysts for methanol oxidation in acidic media because its mechanism is not fully understood yet. In this research, HNO<sub>3</sub> exfoliated graphite powder and iron oxide composites have been synthesized by facile, single-step hydrothermal method. This procedure replaces the long and hazardous route of synthesizing graphene oxide. These composites not only provide large surface area for electrode reactions but also utilize catalytic and electrical capabilities of graphene and iron synergistically. Samples were characterized with FTIR, XRD, and SEM analyses while electrocatalytic efficiencies were studied with cyclic voltammetry and electrochemical impedance spectroscopy. Composites have shown remarkable efficiencies for oxidation of methanol in acidic 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":"275 - 281"},"PeriodicalIF":2.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12678-024-00917-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0