{"title":"利用双金属核@壳结构纳米颗粒合成金属间铂钴燃料电池催化剂","authors":"","doi":"10.1016/j.jechem.2024.09.028","DOIUrl":null,"url":null,"abstract":"<div><div>The high activity and stability of intermetallic PtCo nanocatalysts toward oxygen reduction reaction make them a top candidate as low-Pt cathode catalysts in proton exchange membrane fuel cells (PEMFCs). However, forming intermetallic structures typically requires high-temperature annealing, posing a challenge for achieving well-size control and highly ordered structures. Here we report the design and synthesis of bimetallic core@shell structured precursors for affording high-performance intermetallic PtCo catalysts. The fabrication of the core@shell precursor involves using a molecular ligand containing both sulfur and oxygen donors to selectively bind with Pt colloidal nanoparticles as the core and chelate Co ions as the shell. During high-temperature annealing, the ligand transforms into carbon coatings around alloy nanoparticles, preventing particle sintering; meanwhile, Co ions in the shell can easily diffuse into the Pt core, which helps to increase the thermodynamic driving force for forming intermetallic structures. These benefits enable us to obtain the catalyst with finely dispersed nanoparticles (∼3.5 nm) and a high ordering degree of 72%. With 0.1 mg<sub>Pt</sub>/cm<sup>2</sup> cathode loading, the catalyst delivers superior performance and durability in PEMFCs, showing an initial mass activity of 0.56 A/mg<sub>Pt</sub>, an initial power density of 1.05 W/cm<sup>2</sup> at 0.67 V (H<sub>2</sub>-air), and a voltage loss of 26 mV at 0.8 A/cm<sup>2</sup> after the accelerated durability test.</div></div>","PeriodicalId":15728,"journal":{"name":"Journal of Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":13.1000,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Synthesis of intermetallic PtCo fuel cell catalysts from bimetallic core@shell structured nanoparticles\",\"authors\":\"\",\"doi\":\"10.1016/j.jechem.2024.09.028\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The high activity and stability of intermetallic PtCo nanocatalysts toward oxygen reduction reaction make them a top candidate as low-Pt cathode catalysts in proton exchange membrane fuel cells (PEMFCs). However, forming intermetallic structures typically requires high-temperature annealing, posing a challenge for achieving well-size control and highly ordered structures. Here we report the design and synthesis of bimetallic core@shell structured precursors for affording high-performance intermetallic PtCo catalysts. The fabrication of the core@shell precursor involves using a molecular ligand containing both sulfur and oxygen donors to selectively bind with Pt colloidal nanoparticles as the core and chelate Co ions as the shell. During high-temperature annealing, the ligand transforms into carbon coatings around alloy nanoparticles, preventing particle sintering; meanwhile, Co ions in the shell can easily diffuse into the Pt core, which helps to increase the thermodynamic driving force for forming intermetallic structures. These benefits enable us to obtain the catalyst with finely dispersed nanoparticles (∼3.5 nm) and a high ordering degree of 72%. With 0.1 mg<sub>Pt</sub>/cm<sup>2</sup> cathode loading, the catalyst delivers superior performance and durability in PEMFCs, showing an initial mass activity of 0.56 A/mg<sub>Pt</sub>, an initial power density of 1.05 W/cm<sup>2</sup> at 0.67 V (H<sub>2</sub>-air), and a voltage loss of 26 mV at 0.8 A/cm<sup>2</sup> after the accelerated durability test.</div></div>\",\"PeriodicalId\":15728,\"journal\":{\"name\":\"Journal of Energy Chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":13.1000,\"publicationDate\":\"2024-09-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Energy Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S209549562400651X\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"Energy\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Energy Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S209549562400651X","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Energy","Score":null,"Total":0}
Synthesis of intermetallic PtCo fuel cell catalysts from bimetallic core@shell structured nanoparticles
The high activity and stability of intermetallic PtCo nanocatalysts toward oxygen reduction reaction make them a top candidate as low-Pt cathode catalysts in proton exchange membrane fuel cells (PEMFCs). However, forming intermetallic structures typically requires high-temperature annealing, posing a challenge for achieving well-size control and highly ordered structures. Here we report the design and synthesis of bimetallic core@shell structured precursors for affording high-performance intermetallic PtCo catalysts. The fabrication of the core@shell precursor involves using a molecular ligand containing both sulfur and oxygen donors to selectively bind with Pt colloidal nanoparticles as the core and chelate Co ions as the shell. During high-temperature annealing, the ligand transforms into carbon coatings around alloy nanoparticles, preventing particle sintering; meanwhile, Co ions in the shell can easily diffuse into the Pt core, which helps to increase the thermodynamic driving force for forming intermetallic structures. These benefits enable us to obtain the catalyst with finely dispersed nanoparticles (∼3.5 nm) and a high ordering degree of 72%. With 0.1 mgPt/cm2 cathode loading, the catalyst delivers superior performance and durability in PEMFCs, showing an initial mass activity of 0.56 A/mgPt, an initial power density of 1.05 W/cm2 at 0.67 V (H2-air), and a voltage loss of 26 mV at 0.8 A/cm2 after the accelerated durability test.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy