Structure of Ni(OH)2 intermediates determines the efficiency of NiO-based photocathodes-a case study using novel mesoporous NiO nanostars

Ruri Agung Wahyuono, Andrea Dellith, Christa Schmidt, Jan Dellith, Anna Ignaszak, Martin Seyring, Markus Rettenmayr, Jennifer Fize, Vincent Artero, Murielle Chavarot-Kerlidou, Benjamin Dietzek*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We report the wet chemical synthesis of mesoporous NiO nanostars (NS) as photocathode material for dye-sensitized solar cells (DSSCs). The growth mechanism of NiO NS as a new morphology of NiO is assessed by TEM and spectroscopic investigations. The NiO NS are obtained upon annealing of preformed β-Ni(OH)2 into pristine NiO with low defect concentrations and favorable electronic configuration for dye sensitization. The NiO NS consist of fibers self-assembled from nanoparticles yielding a specific surface area of 44.9 m2 g-1. They possess a band gap of 3.83 eV and can be sensitized by molecular photosensitizers bearing a range of anchoring groups, e.g. carboxylic acid, phosphonic acid, and pyridine. The performance of NiO NS-based photocathodes in photoelectrochemical application is compared to that of other NiO morphologies, i.e. nanoparticles and nanoflakes, under identical conditions. Sensitization of NiO NS with the benchmark organic dye P1 leads to p-DSSCs with a high photocurrent up to 3.91

Original languageEnglish
Pages (from-to)39422-39433
Number of pages12
JournalRSC Advances
Volume9
Issue number67
DOIs
Publication statusPublished - 2019
Externally publishedYes

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