• Login
    View Item 
    •   etd@IISc
    • Division of Chemical Sciences
    • Materials Research Centre (MRC)
    • View Item
    •   etd@IISc
    • Division of Chemical Sciences
    • Materials Research Centre (MRC)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Constructing transition metal-based heterostructure nanomaterials for electrocatalysis

    View/Open
    Thesis full text (10.83Mb)
    Author
    Sarkar, Bidushi
    Metadata
    Show full item record
    Abstract
    Storing renewable energy into chemical bonds like hydrogen as a carbon-neutral energy carrier to deliver the energy demands is gaining attention. However, the popular hydrogen production route by water electrolysis involves sluggish half-cell reactions, namely, hydrogen and oxygen evolution reaction (HER and OER), urging the unequivocal development of electrocatalysts. Further, the employment of hydrogen in fuel cells involves a multielectron cathodic oxygen reduction reaction (ORR) that governs the overall efficiency of the fuel cells. Therefore, designing efficient alternatives to scarce and expensive Pt and RuO2-based commercial benchmark electrocatalysts is essential. We have rationally designed transition-metal-based monometallic, bimetallic, and nitride-based hybrid carbon nanostructures for the various electrocatalytic reactions. An inexpensive bimetallic (CoCr) system is developed for water splitting, and the activity is found to be better than the monometallic counterparts. To enhance the electroactive surface area, ultrafine Ru nanoparticles are decorated on N-doped carbon and exploited as bifunctional HER and ORR electrocatalysts. Short carbon nanotubes grafted on the N-doped carbon polyhedra anchoring the alloys of Co are synthesized for water splitting catalysis. Further, the role of Mott-Schottky heterojunction formation at the Ru/N-doped carbon interface towards HER activity is elucidated. Finally, an in-situ ammonia-free strategy to obtain CrN is explored as a Pt-free ORR catalyst. The mechanistic insights into the active site and reaction pathway are investigated using experimental analysis and density functional theory (DFT) calculations.
    URI
    https://etd.iisc.ac.in/handle/2005/5672
    Collections
    • Materials Research Centre (MRC) [202]

    etd@IISc is a joint service of SERC & J R D Tata Memorial (JRDTML) Library || Powered by DSpace software || DuraSpace
    Contact Us | Send Feedback | Thesis Templates
    Theme by 
    Atmire NV
     

     

    Browse

    All of etd@IIScCommunities & CollectionsTitlesAuthorsAdvisorsSubjectsBy Thesis Submission DateThis CollectionTitlesAuthorsAdvisorsSubjectsBy Thesis Submission Date

    My Account

    LoginRegister

    etd@IISc is a joint service of SERC & J R D Tata Memorial (JRDTML) Library || Powered by DSpace software || DuraSpace
    Contact Us | Send Feedback | Thesis Templates
    Theme by 
    Atmire NV