Investigation of surface and non-local screening effects in the Ni 2p core level photoemission spectra of NiO

Mossanek, R. J. O.; Preda, I.; Abbate, M.; Rubio-Zuazo, J.; Castro, G.R.; Vollmer, Antje; Gutiérrez, Alejandro; Soriano, L.

doi:10.1016/j.cplett.2010.11.050

Cited by 82 publications

(57 citation statements)

References 19 publications

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“…We introduced five components to reconstruct the complex Ni 2p 3/2 signal, as reported in Figure S5 and Table S2 (Supporting Information). The complex signal arising from the Ni 2p photoionization is attributable to different relaxation mechanisms involving not only the Ni atom itself, but also the orbitals of oxygen ligands as well as the surrounding unit cells . We first note that the same signal reconstruction for NiO is effective with sodium doping, confirming that no additional nickel containing phases are produced (e.g., NaNiO 2 ).…”

Section: Resultsmentioning

confidence: 57%

From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface

Girolamo

Phung

Jost

et al. 2019

Adv Materials Inter

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The effect of sodium doping in NiO as a contact layer for perovskite solar cells is investigated. A combined X‐ray diffraction and X‐ray photoelectron spectroscopy analysis reveals that Na+ mostly segregates as NaOx/NaCl species around NiO crystallites, with the effect of reducing interface capacitance as revealed by impedance spectroscopy. Inspired by this finding, the NiO/perovskite interface in perovskite solar cells is modified via insertion of an ultrathin NaCl interlayer, which increases the NiO work‐function by 0.3 eV. This leads to an increase of power conversion efficiency, approaching 18%, and open‐circuit voltage due to a remarkable suppression of surface recombination, as revealed by photoluminescence analysis and light intensity–dependent electrical measurements.

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Section: Resultsmentioning

confidence: 57%

From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface

Girolamo

Phung

Jost

et al. 2019

Adv Materials Inter

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“…The most intense photoemission and Auger peaks related to the EryB/NiO system can be identified (Ni 2p, Ni LMM, O 1s, O KVV, I 3d, C 1s) together with minor contributions from Sn due to possible microscopic scratches exposing the underneath surface of FTO glass substrate to the X-ray beam. In the inset of Figure 6, a high-resolution XP spectrum of Ni 2p region is reported, revealing the typical envelopeof NiO[50][51][52][53]. A thorough description of the bare NiO XP spectral features can be found in previous works by us and other authors[28,50,52,53].…”

mentioning

confidence: 70%

“…In the inset of Figure 6, a high-resolution XP spectrum of Ni 2p region is reported, revealing the typical envelopeof NiO[50][51][52][53]. A thorough description of the bare NiO XP spectral features can be found in previous works by us and other authors[28,50,52,53]. In particular, the Ni 2p 3/2 region appears complicated due to interaction between different electronic configurations in the final state after the creation of the 2p core-hole upon photoemission.…”

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confidence: 75%

X-ray photoelectron spectroscopy investigation of nanoporous NiO electrodes sensitized with Erythrosine B

Bonomo

Marrani

Zanoni

2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Nanoporous NiO thin films were prepared onto FTO glass substrates by means of screen-printing and were sensitized with Erythrosine B (EryB) dye. The obtained material was electrochemically treated and characterized with ex-situ X-ray photoelectron spectroscopy in order to gain information beneficial to the application of sensitized NiO as photocathodes of p-type dye-sensitized solar cells (p-DSCs). In particular, EryB-sensitized NiO films underwent a series of electrochemical treatments in LiClO4/Acetonitrile (ACN) electrolyte devised so as to simulate possible conditions the electrode might encounter during operation in the photoelectrochemical cell. Upon potential-cycling in a range where the two NiO faradic events Ni(II)→Ni(III) and Ni(III)→Ni(IV) occur, X-ray photoelectron spectroscopy revealed that Erythrosine B dye experiences a partial detachment from the NiO surface. This detachment seems to be paralleled by the formation of stable (Ni)+(ClO4)- couples. Overall, the EryB dye displayed an acceptable electrochemical stability onto the surface of NiO electrode up to 50 cyclic voltammetries in the range -0.27÷+1.13V vs. Ag/AgCl. These results are useful for the evaluation of electrochemical stability of the dye when this is immobilized onto an electrode surface and are beneficial for a better comprehension of the degradation phenomena operating in real photoconversion device. © 2017 Elsevier B.V

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“…The XPS spectrum in Figure a reveals the existence of Ni, Co, O, and P in the NiCo 2 O 4 /Ni 2 P composite catalyst. As shown in Figure b, the Ni 2p 3/2 spectrum shows four peaks with binding energies of 853.0, 855.6, 856.8, and 861.4 eV, which should be related to the Ni‐P, Ni 2+ , Ni 3+ , and the satellite peak, respectively . Notice that the binding energy of 853.0 eV is very close to that of metal Ni, which suggests the existence of partially reduced Ni species .…”

Section: Resultsmentioning

confidence: 82%

Anchoring Ni₂P Sheets on NiCo₂O₄ Nanocone Arrays as Optimized Bifunctional Electrocatalyst for Water Splitting

Wang

et al. 2017

Adv Materials Inter

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Bifunctional electrocatalyst is promising for the overall water splitting with high efficiency. Herein, inspired by the superior oxygen evolution reaction (OER) performance of transition metal oxide and remarkable hydrogen evolution reaction (HER) activity of transition metal phosphide, hierarchical NiCo2O4/Ni2P core–shell nanocone array on Ni foam is synthesized. The synergetic effect between the NiCo2O4 “core” and the Ni2P “shell” results in dramatically enhanced catalytic performance. It shows higher activity and longer durability in both OER and HER than bare NiCo2O4 or Ni2P. The hierarchical NiCo2O4/Ni2P catalyst is capable of catalyzing OER with a low overpotential of 250 mV at 10 mA cm−2 in alkaline media. Moreover, it shows excellent catalytic activity for HER to achieve 10 mA cm−2 at a small overpotential of 45 mV. When the NiCo2O4/Ni2P is adopted as both anode and cathode in a two‐electrode cell for overall water splitting, it only needs 1.59 V to reach a current density of 10 mA cm−2. Almost no decay is observed after the electrodes work for about 50 h. The newly developed electrocatalyst combines the satisfactory working stability with outstanding catalytic activity, which paves the way for exploring overall water splitting catalysts.

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Investigation of surface and non-local screening effects in the Ni 2p core level photoemission spectra of NiO

Cited by 82 publications

References 19 publications

From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface

From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface

X-ray photoelectron spectroscopy investigation of nanoporous NiO electrodes sensitized with Erythrosine B

Anchoring Ni₂P Sheets on NiCo₂O₄ Nanocone Arrays as Optimized Bifunctional Electrocatalyst for Water Splitting

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Investigation of surface and non-local screening effects in the Ni 2p core level photoemission spectra of NiO

Cited by 82 publications

References 19 publications

From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface

From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface

X-ray photoelectron spectroscopy investigation of nanoporous NiO electrodes sensitized with Erythrosine B

Anchoring Ni2P Sheets on NiCo2O4 Nanocone Arrays as Optimized Bifunctional Electrocatalyst for Water Splitting

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Anchoring Ni₂P Sheets on NiCo₂O₄ Nanocone Arrays as Optimized Bifunctional Electrocatalyst for Water Splitting