Structure of Ni(OH) 2 intermediates determines the efficiency of NiO-based photocathodes – a case study using novel mesoporous NiO nanostars - Archive ouverte HAL
Article Dans Une Revue RSC Advances Année : 2019

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

Résumé

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 beta-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 m(2) 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 mA cm(-2) whilst the photoelectrochemical activity of the NiO NS photocathode in aqueous medium in the presence of an irreversible electron acceptor is reflected by generation of a photocurrent up to 23 mu A cm(-2).
Fichier principal
Vignette du fichier
2019 RSC Advances.pdf (2.52 Mo) Télécharger le fichier
Origine Publication financée par une institution

Dates et versions

hal-03084850 , version 1 (21-12-2020)

Identifiants

Citer

Ruri Agung Wahyuono, Andrea Dellith, Christa Schmidt, Jan Dellith, Anna Ignaszak, et al.. Structure of Ni(OH) 2 intermediates determines the efficiency of NiO-based photocathodes – a case study using novel mesoporous NiO nanostars. RSC Advances, 2019, 9 (67), pp.39422-39433. ⟨10.1039/c9ra08785k⟩. ⟨hal-03084850⟩
100 Consultations
119 Téléchargements

Altmetric

Partager

More