Issue 18, 2019

A tandem redox system with a cobalt complex and 2-azaadamantane-N-oxyl for fast dye regeneration and open circuit voltages exceeding 1 V

Abstract

A new tandem electrolyte composed of two redox pairs, the organic radical 2-azaadamantane-N-oxyl (AZ) and the well-known redox pair [Co(bpy)3]3+/2+ was investigated in dye sensitized solar cells. Importantly, an increase in VOC was achieved using the new tandem redox system with values up to 1007 mV, compared to only 896 mV for the reference [Co(bpy)3]3+/2+ couple. Consequently, the tandem electrolytes presented higher device performance in conjunction with the organic dye XY1. It was determined that the VOC improvement is mainly attributed to the combined effect of two factors: the more positive redox potential of the small donor AZ (0.81 V vs. SHE) and improved recombination resistance in the tandem electrolytes.

Graphical abstract: A tandem redox system with a cobalt complex and 2-azaadamantane-N-oxyl for fast dye regeneration and open circuit voltages exceeding 1 V

Supplementary files

Article information

Article type
Paper
Submitted
14 Jan 2019
Accepted
01 Apr 2019
First published
02 Apr 2019

J. Mater. Chem. A, 2019,7, 10998-11006

A tandem redox system with a cobalt complex and 2-azaadamantane-N-oxyl for fast dye regeneration and open circuit voltages exceeding 1 V

N. Flores-Díaz, H. Bahng, N. Vlachopoulos, Jacques-E. Moser, S. M. Zakeeruddin, M. Grätzel and A. Hagfeldt, J. Mater. Chem. A, 2019, 7, 10998 DOI: 10.1039/C9TA00490D

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