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

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

doi:10.1039/c9ra08785k

Cited by 4 publications

(1 citation statement)

References 66 publications

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“…Recently, the attention of researchers in this field has been attracted by the methods of forming anisotropic nanomaterials with a hierarchical organization of the microstructure and a developed surface which, in turn, accelerates the charge transfer processes and enables a significant improvement of the corresponding materials’ electrophysical properties [ 22 , 23 , 24 , 25 , 26 , 27 ]. According to data from the literature, one of the most convenient methods for obtaining self-organized nanomaterials is by using the hydrothermal method which, depending on the process conditions, allows for the formation of solid phase particles of different shapes and dispersions and is characterized by the necessary crystal structure type and crystallinity degree [ 28 , 29 , 30 , 31 ]. In the majority of works devoted to the hydrothermal synthesis of nickel hydroxide or nickel oxide, the base medium is provided by sodium hydroxide, ammonia hydrate, and urea [ 32 , 33 , 34 , 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Nickel Oxide and Its Application in the Additive Manufacturing of Planar Nanostructures

et al. 2023

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The hydrothermal synthesis of nickel oxide in the presence of triethanolamine was studied. Furthermore, the relationship between the synthesis conditions, thermal behavior, crystal structure features, phase composition and microstructure of semi-products, and the target oxide nanopowders was established. The thermal behavior of the semi-products was studied using a simultaneous thermal analysis (in particular, using one that involved thermogravimetric analysis and differential scanning calorimetry, TGA/DSC). An X-ray diffraction (XRD) analysis revealed that varying the triethanolamine and nickel chloride concentration in the reaction system can govern the formation of α- and β-Ni(OH)2-based semi-products that contain Ni(HCO3)2 or Ni2(CO3)(OH)2 as additional components. The set of functional groups in the powders was determined using a Fourier-transform infrared (FTIR) spectroscopy analysis. Using microextrusion printing, a composite NiO—(CeO2)0.80(Sm2O3)0.20 anode film was fabricated. Using XRD, scanning electron microscopy (SEM), and atomic force microscopy (AFM) analyses, it was demonstrated that the crystal structure, dispersity, and microstructure character of the obtained material correspond to the initial nanopowders. Using Kelvin probe force microscopy (KPFM) and scanning capacitance microscopy (SCM), the local electrophysical properties of the printed composite film were examined. The value of its conductivity was evaluated using the four-probe method on a direct current in the temperature range of 300–650 °C. The activation energy for the 500–650 °C region, which is of most interest in the context of intermediate-temperature SOFCs working temperatures, has been estimated.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Nickel Oxide and Its Application in the Additive Manufacturing of Planar Nanostructures

et al. 2023

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Structure of Diethyl‐Phosphonic Acid Anchoring Group Affects the Charge‐Separated State on an Iridium(III) Complex Functionalized NiO Surface

et al. 2020

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Cyclometalated Iridium(III) complexes, i. e. [Ir(C N)2(dppz)][PF6], bearing either two or four ‐CH2PO(OH)2 anchoring groups (IrP2dppz or IrP4dppz) are explored as photosensitizers for p‐type dye sensitized solar cell (DSSC). The synthetic route is described and the iridium(III) complexes are characterized with respect to their electrochemical and photophysical properties. The modified anchoring ligand geometry exploited in this work not only alters the electronic nature of the complex (that is by destabilizing the LUMO energetically) but more importantly improves the grafting ability of the complex towards the NiO surface. The photoinduced long‐lived charge separated state (CSS) at the NiO|IrPxdppz interface is of a different nature comparing the two complexes. For IrP2dppz and IrP4dppz the electron density of the CSS dominantly resides on the dppz and the C N ligand, respectively. The stability of the CSS can be correlated to the solar cell performance in NiO‐based p‐DSSCs, which yield conversion efficiencies which are among the highest in the class of iridium(III) complexes developed for p‐DSSCs.

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Structural, optical, chromaticity, and magnetic properties of uncapped and reduced graphene oxide (rGO) capped-β-Ni(OH)2 nanostructures for spintronic devices, and LED applications

Gajendiran,

Ramya,

Gnanam

et al. 2025

Inorganic Chemistry Communications

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

Abstract: NiO nanostructures prepared from β-Ni(OH)2 intermediates exhibit favorable electronic properties for functional photocathodes for solar energy conversion devices.

Cited by 4 publications

References 66 publications

Hydrothermal Synthesis of Nickel Oxide and Its Application in the Additive Manufacturing of Planar Nanostructures

Hydrothermal Synthesis of Nickel Oxide and Its Application in the Additive Manufacturing of Planar Nanostructures

Structure of Diethyl‐Phosphonic Acid Anchoring Group Affects the Charge‐Separated State on an Iridium(III) Complex Functionalized NiO Surface

Structural, optical, chromaticity, and magnetic properties of uncapped and reduced graphene oxide (rGO) capped-β-Ni(OH)2 nanostructures for spintronic devices, and LED applications

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

Abstract: NiO nanostructures prepared from β-Ni(OH)2 intermediates exhibit favorable electronic properties for functional photocathodes for solar energy conversion devices.

Cited by 4 publications

References 66 publications

Hydrothermal Synthesis of Nickel Oxide and Its Application in the Additive Manufacturing of Planar Nanostructures

Hydrothermal Synthesis of Nickel Oxide and Its Application in the Additive Manufacturing of Planar Nanostructures

Structure of Diethyl‐Phosphonic Acid Anchoring Group Affects the Charge‐Separated State on an Iridium(III) Complex Functionalized NiO Surface

Structural, optical, chromaticity, and magnetic properties of uncapped and reduced graphene oxide (rGO) capped-β-Ni(OH)2 nanostructures for spintronic devices, and LED applications

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