Photoelectrochemical properties and interfacial charge transfer kinetics of BODIPY-sensitized TiO2 electrodes

Hongwei Geng; Caleb M. Hill; Shilei Zhu; Haiying Liu; Libai Huang; Shanlin Pan

doi:10.1039/C2RA21656F

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Photoelectrochemical properties and interfacial charge transfer kinetics of BODIPY-sensitized TiO₂ electrodes†

Hongwei Geng,‡^a Caleb M. Hill,‡^a Shilei Zhu,^b Haiying Liu,^b Libai Huang^c and Shanlin Pan*^a

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* Corresponding authors

^a Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama, 35487, USA
E-mail: span1@bama.ua.edu

^b Department of Chemistry, Michigan Technological University, Houghton, Michigan, 49931, USA

^c Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana, 46556, USA

Abstract

We present studies of the photoelectrochemical characteristics and interfacial charge transfer dynamics of two (4,4′-difluoro-4-bora-3a,4a-diaza-s-indacene) BODIPY dyes (BODIPY-1 and 2) attached to nanostructured TiO₂ electrodes. BODIPY-1 bears two carboxylic acid groups at its 2 and 6 positions and BODIPY-2 is modified with two cyanoacetic acid groups at these positions. Photoelectrochemistry measurements show that BODIPY-2 has better photostability and device short-circuit current density than BODIPY-1 because of its broader light absorption and efficient charge injection as shown by ultrafast transient absorption spectroscopy and steady-state photoelectrochemical studies. The more efficient photocurrent generation by BODIPY-2 is also attributed to the improved redox reaction kinetics with its hole transport media, I⁻/I₃⁻, in comparison with BODIPY-1.

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Article information

DOI: https://doi.org/10.1039/C2RA21656F
Article type: Paper
Submitted: 01 Aug 2012
Accepted: 03 Dec 2012
First published: 04 Dec 2012

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RSC Adv., 2013,3, 2306-2312

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Photoelectrochemical properties and interfacial charge transfer kinetics of BODIPY-sensitized TiO₂ electrodes

H. Geng, C. M. Hill, S. Zhu, H. Liu, L. Huang and S. Pan, RSC Adv., 2013, 3, 2306 DOI: 10.1039/C2RA21656F

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