CV pres - Electrochemical and photophysical study of a...

Info icon This preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
David Grauer January 15, 2008 Electrochemical and photophysical study of a hydrogen evolving, photoactive iridium complex and cobalt electron relay
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Introduction Much time, energy and resource has been invested recently in alternative fuel sources. Among these fuels, hydrogen has emerged as a top competitor. While hydrogen is abundant, it is most typically bound to oxygen in water Objective is to efficiently reduce hydrogen, releasing it in its gaseous form, H 2 Many ways of accomplishing this reduction (e.g. electrolysis). This study focuses on a photocatalytic cycle using iridium and cobalt. Purpose is two fold: Discern electron transfer mechanisms and assess efficiency of three different Co electron relays (ER)
Image of page 2
Involved Complexes 1. [Co(bppy) 3 ] 2+ 2. [Co(dtb-bpy) 3 ] 2+ 3. [Co(trpy) 2 ] 2+ Electron Relays (ERs)
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
General Mechanism H + ER - PS h PS * SR H ER PS - SR + SR H + ER - PS + SR + PS H ER PS * h Reductive Quenching Oxidative Quenching SR = Sacrificial Reductant
Image of page 4
Materials and Methods It was necessary to synthesize the three Co ERs and Ir complexes using tried and true techniques (Goldsmith et al., 2004). Sought to glean information about mechanism involved with function of ERs 1 and 2. ER 3 cannot produce H 2 and was used as a control. ERs went through three different studies to determine effectiveness and possible mechanisms and intermediates. Electrochemical (Cyclic Voltammetry), Photophysical (Quenching) and Photoreaction (Hyrdogen Production)
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Methods Continued Cyclic Voltammetry Performed only on the separate ERs (1,2 and 3). Voltammograms taken at scan rates between 30 and 30,000 mV/s. Results processed using Nicholson Shain analysis. Quenching Studies Measured lifetimes of the various ERs in the presence of the PS.
Image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern