{"title":"可扩展地合成 N 掺杂氧化石墨烯支撑的 FeCo(OH)x 纳米片,用于基于共掺 Fe3O4 纳米粒子的高效氧还原反应电催化","authors":"Sunglun Kwon and Jong Hyeon Lee","doi":"10.1039/D4TA06684G","DOIUrl":null,"url":null,"abstract":"<p >Developing efficient and cost-effective materials is crucial for advancing the electrochemical oxygen reduction reaction (ORR). By introducing Co<small><sup>2+</sup></small> ions into formamide, our method prevents rapid Fe<small><sup>2+</sup></small> oxidation to Fe<small><sup>3+</sup></small>, promoting the formation of well-defined Fe<small><sub>3</sub></small>O<small><sub>4</sub></small> nanoparticles rather than Fe<small><sub>2</sub></small>O<small><sub>3</sub></small>. This study presents a synthesis route for high-performance spinel Fe and Co oxide nanoparticles on N-doped reduced graphene oxide (NRGO). This solvothermal synthesis in formamide yields well-dispersed, ultrafine FeCo(OH)<small><sub><em>x</em></sub></small> nanoparticles (∼5 nm) anchored on NRGO. These nanoparticles can be employed for the formation of spinel Fe<small><sub><em>x</em></sub></small>Co<small><sub>3−<em>x</em></sub></small>O<small><sub>4</sub></small> oxide nanoparticles, potentially due to their high surface area and strong interaction with the NRGO support. This, in turn, facilitates the successful decoration of highly dispersed spinel Fe<small><sub><em>x</em></sub></small>Co<small><sub>3−<em>x</em></sub></small>O<small><sub>4</sub></small> oxide nanoparticles (∼30 nm) onto the NRGO support, even after calcination at 900 °C, which represents the critical temperature for conventional graphitization. This unique approach results in significantly reduced particle aggregation compared with that of conventional methods. The (Co)Fe<small><sub>3</sub></small>O<small><sub>4</sub></small>-NRGO nanocomposite exhibits remarkable ORR activity, achieving an electron number of ∼3.7 and a current density of 5.01 mA cm<small><sup>−2</sup></small> at <em>E</em> = 0.75 V<small><sub>RHE</sub></small>, comparable to those of commercial Pt/C catalysts. Furthermore, the catalyst exhibits remarkable stability, maintaining a reducing current density that is 42% lower after 40 000 s of uninterrupted operation at 0.75 V<small><sub>RHE</sub></small> compared with a 75% reduction observed with Pt/C. This exceptional performance is attributed to the strong interaction between the (Co)Fe<small><sub>3</sub></small>O<small><sub>4</sub></small> nanoparticles and NRGO, facilitated by the Co ion precursor during annealing.</p>","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":" 48","pages":" 33799-33807"},"PeriodicalIF":10.7000,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ta/d4ta06684g?page=search","citationCount":"0","resultStr":"{\"title\":\"Scalable synthesis of N-doped graphene-oxide-supported FeCo(OH)x nanosheets for efficient Co-doped Fe3O4 nanoparticle-based oxygen reduction reaction electrocatalysis†\",\"authors\":\"Sunglun Kwon and Jong Hyeon Lee\",\"doi\":\"10.1039/D4TA06684G\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Developing efficient and cost-effective materials is crucial for advancing the electrochemical oxygen reduction reaction (ORR). By introducing Co<small><sup>2+</sup></small> ions into formamide, our method prevents rapid Fe<small><sup>2+</sup></small> oxidation to Fe<small><sup>3+</sup></small>, promoting the formation of well-defined Fe<small><sub>3</sub></small>O<small><sub>4</sub></small> nanoparticles rather than Fe<small><sub>2</sub></small>O<small><sub>3</sub></small>. This study presents a synthesis route for high-performance spinel Fe and Co oxide nanoparticles on N-doped reduced graphene oxide (NRGO). This solvothermal synthesis in formamide yields well-dispersed, ultrafine FeCo(OH)<small><sub><em>x</em></sub></small> nanoparticles (∼5 nm) anchored on NRGO. These nanoparticles can be employed for the formation of spinel Fe<small><sub><em>x</em></sub></small>Co<small><sub>3−<em>x</em></sub></small>O<small><sub>4</sub></small> oxide nanoparticles, potentially due to their high surface area and strong interaction with the NRGO support. This, in turn, facilitates the successful decoration of highly dispersed spinel Fe<small><sub><em>x</em></sub></small>Co<small><sub>3−<em>x</em></sub></small>O<small><sub>4</sub></small> oxide nanoparticles (∼30 nm) onto the NRGO support, even after calcination at 900 °C, which represents the critical temperature for conventional graphitization. This unique approach results in significantly reduced particle aggregation compared with that of conventional methods. The (Co)Fe<small><sub>3</sub></small>O<small><sub>4</sub></small>-NRGO nanocomposite exhibits remarkable ORR activity, achieving an electron number of ∼3.7 and a current density of 5.01 mA cm<small><sup>−2</sup></small> at <em>E</em> = 0.75 V<small><sub>RHE</sub></small>, comparable to those of commercial Pt/C catalysts. Furthermore, the catalyst exhibits remarkable stability, maintaining a reducing current density that is 42% lower after 40 000 s of uninterrupted operation at 0.75 V<small><sub>RHE</sub></small> compared with a 75% reduction observed with Pt/C. This exceptional performance is attributed to the strong interaction between the (Co)Fe<small><sub>3</sub></small>O<small><sub>4</sub></small> nanoparticles and NRGO, facilitated by the Co ion precursor during annealing.</p>\",\"PeriodicalId\":82,\"journal\":{\"name\":\"Journal of Materials Chemistry A\",\"volume\":\" 48\",\"pages\":\" 33799-33807\"},\"PeriodicalIF\":10.7000,\"publicationDate\":\"2024-11-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://pubs.rsc.org/en/content/articlepdf/2024/ta/d4ta06684g?page=search\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Materials Chemistry A\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://pubs.rsc.org/en/content/articlelanding/2024/ta/d4ta06684g\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Chemistry A","FirstCategoryId":"88","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/ta/d4ta06684g","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Scalable synthesis of N-doped graphene-oxide-supported FeCo(OH)x nanosheets for efficient Co-doped Fe3O4 nanoparticle-based oxygen reduction reaction electrocatalysis†
Developing efficient and cost-effective materials is crucial for advancing the electrochemical oxygen reduction reaction (ORR). By introducing Co2+ ions into formamide, our method prevents rapid Fe2+ oxidation to Fe3+, promoting the formation of well-defined Fe3O4 nanoparticles rather than Fe2O3. This study presents a synthesis route for high-performance spinel Fe and Co oxide nanoparticles on N-doped reduced graphene oxide (NRGO). This solvothermal synthesis in formamide yields well-dispersed, ultrafine FeCo(OH)x nanoparticles (∼5 nm) anchored on NRGO. These nanoparticles can be employed for the formation of spinel FexCo3−xO4 oxide nanoparticles, potentially due to their high surface area and strong interaction with the NRGO support. This, in turn, facilitates the successful decoration of highly dispersed spinel FexCo3−xO4 oxide nanoparticles (∼30 nm) onto the NRGO support, even after calcination at 900 °C, which represents the critical temperature for conventional graphitization. This unique approach results in significantly reduced particle aggregation compared with that of conventional methods. The (Co)Fe3O4-NRGO nanocomposite exhibits remarkable ORR activity, achieving an electron number of ∼3.7 and a current density of 5.01 mA cm−2 at E = 0.75 VRHE, comparable to those of commercial Pt/C catalysts. Furthermore, the catalyst exhibits remarkable stability, maintaining a reducing current density that is 42% lower after 40 000 s of uninterrupted operation at 0.75 VRHE compared with a 75% reduction observed with Pt/C. This exceptional performance is attributed to the strong interaction between the (Co)Fe3O4 nanoparticles and NRGO, facilitated by the Co ion precursor during annealing.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.