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5.20】功能材料沙龍第45期活動
主講嘉賓:郭少軍 教授
題目:材料應變驅動高效能源電催化
2019-05-09 | 供稿: 青年职工俱乐部        【 】【打印】【關閉

報告題目:材料應變驅動高效能源電催化 

主講嘉賓:郭少軍 教授(北京大學) 

時   間:520日(周一)15:30  

地   點:李薰樓356會議室 

    

報告簡介 

  Proton exchange membrane fuel cells (PEMFCs) are generally expected to be the ideal alternative to traditional internal combustion engine as energy-supplying devices for transportation, which consumes nearly 25% of the global energy. However, to guarantee the wide-adoption of PEMFCs, it still requires an efficient electrocatalyst, with higher activity/stability and lower Pt usage than the state-of-the-art carbon supported platinum nanoparticles (Pt/C), towards the cathodic oxygen reduction reaction. But, the absence of low-platinum, high-activity and satisfied-durability electrocatalysts for oxygen reduction reaction has bottlenecked the wide-adoption of PEMFCs for decades. To address this challenge, an efficient strategy is to modify the electronic structure of Pt by alloying with other cheap transition metals (M), normally called ligand or electronic effect. Tuning or controlling the surface strain in multimetallic nanomaterials is a robust method to boost electrocatalytic performance, and tremendous progress has been made in this area in the past decade. In this talk, I will show recent important advances in how to tune the compressive and tensile strain in multimetallic nanocrystals to achieve more efficient energy conversion by electrocatalysis. I will start with the introduction of stain and the basic information on how to tune the strain for the electronic structure tuning. Then, I will give several examples on designing metal-based materials with interesting strain effects for boosting oxygen reduction and hydrogen evolution reaction catalysis. In particular, I will highlight our recent important results on making PtPb/Pt core/shell nanoplates with biaxial strain for boosting oxygen reduction catalysis, which exhibit much higher activity and stability for oxygen reduction catalysis. Furthermore, I will show that our strain tuning concept will be extended to other Pd-based and transition metal-based materials system for greatly enhancing oxygen reduction and hydrogen evolution catalysis. 

    

主講嘉賓簡介: 

  郭少軍,北京大学教授,博士生导师。全球高被引科学家、英国皇家化学学会会士、爱思唯尔高被引学者、北京首届杰青、国家千青。长期从事电催化、储能电池与生物传感材料研究,在材料应变驱动高效金属能源电催化领域取得创新性和系统性的研究成果。独立工作后以通讯作者在Nature, ScienceNature Reviews Materials等期刊發表論文100余篇。獲Journal of Materials Chemistry講座獎、國際電化學會應用電化學獎、中國青年分析化學家獎和中國電化學會青年科學家獎等學術獎勵。兼任ACS Omega副主編,Science China MaterialsNano Materials ScienceScience BulletinEnergyChem7個國內外雜志的編委。現任北京化學會理事、中國材料研究會青年委員會-副秘書長、理事等學術職務。 

    

歡迎廣大職工和研究生前來交流! 

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