Surface analysis of transition metal oxalates: Damage aspects

Chenakin, S. P.; Szukiewicz, R.; Barbosa, Roland; Kruse, Norbert

doi:10.1016/j.elspec.2016.04.001

Cited by 43 publications

(43 citation statements)

References 52 publications

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“…3a. Reduction of Cu 2+ to Cu + in azurite and malachite upon X-ray irradiation is in agreement with the results obtained after X-ray exposure of several other copper compounds, such as CuO [22,23], Cu(OH) 2 [21], Cu oxalate [24] and Cu(II) complexes [25], and with the photoreduction effect of CuO after irradiation with a mercury lamp (253.7 nm) [26]. The effect of nanosecond Q-switched Nd:YAG laser irradiation of malachite at ambient conditions was studied at the wavelength of 1064 and decomposition of the pigment in CuO and/or Cu 2 O [11,27] was identified.…”

Section: Azurite and Malachite Pigmentssupporting

confidence: 90%

X-ray and ion irradiation effects on azurite, malachite and alizarin pictorial models

Carrasco

Oujja

Sanz

et al. 2018

Microchemical Journal

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The analysis by intense radiation sources of painting materials used in artworks gives valuable information about their composition and state of conservation, but it can also induce undesired modifications on the studied substrates. Here we use X-ray photoelectron spectroscopy (XPS) to follow the surface chemical changes that prolonged irradiation with soft X-rays (with maximum doses ranging from ~ 1.2x10 17 to ~ 3.4x10 17 photons cm -2 ) produce on azurite, malachite and alizarin pigments and on two egg-yolk temperas containing azurite or alizarin. The effects following exposure to Argon ion irradiation have been also studied for malachite and azurite tempera. XPS spectra of the samples show that both types of radiation induce similar superficial alterations, although, at the selected experimental conditions, the modification rate is slower for exposure to soft X-rays. The highest radiation stability is shown for alizarin and, on the contrary, azurite and malachite experience a progressive chemical reduction of Cu 2+ to Cu + . The reduction of copper takes also place in the azurite tempera, while the proteins and lipids of the egg-yolk binder of azurite and alizarin temperas are subjected to degradation by irradiation with photons and ions. By employing XPS, the cleavage of C-N, C-O(H) and C=O bonds has been identified in the egg-yolk temperas.

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Section: Azurite and Malachite Pigmentssupporting

confidence: 90%

X-ray and ion irradiation effects on azurite, malachite and alizarin pictorial models

Carrasco

Oujja

Sanz

et al. 2018

Microchemical Journal

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“…The main peaks in the Ni 2p 3/2 band of NF‐S, NF‐O, and NF‐P are located at the binding energies of 856.95, 856.79, and 856.29 eV, respectively. These binding energy values are consistent with those in NiSO 4 , NiC 2 O 4 , and Ni 3 (PO 4 ) 2 , indicating some sort of interaction between the acid group anions and the substrate. Furthermore, energy dispersive spectroscopy (EDS) mapping has been performed for NF‐S, NF‐O, and NF‐P as shown in Figure S1 in the Supporting Information in which the S, C, and P elements were detected in NF‐S, NF‐O, and NF‐P, respectively.…”

Section: Resultssupporting

confidence: 81%

Controlling the Growth of Ni₃S₂ Anode with Tunable Sodium Storage

Song

Bai

et al. 2018

Adv Materials Inter

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The influences of acids on the surface of nickel foam and its effect on the growth of nickel sulfide are studied. Treated by sulfuric acid, oxalic acid, and phosphoric acid, three Ni foams are fabricated with different surface states containing different surface roughness and different surface layers with nickel salts. By controlling the reaction conditions, three Ni3S2 morphological structures with nanosheets, clustered nanosheets, and nanoparticles are designed on these preprocessed Ni foams. The applications of these Ni3S2/Ni electrodes for sodium ion batteries are examined in detail. The findings provide a new idea for the control of the solid–liquid reaction interface, which highly affect the morphologies of Ni3S2.

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“…The high‐resolution spectra of these peaks offered more details of the (Ni 0.7 Fe 0.3 )C 2 O 4 sample. The C 1s XPS spectrum of the (Ni 0.7 Fe 0.3 )C 2 O 4 sample consists of a strong peak at 288.7 eV, which is corresponding to the C from C 2 O 4 2− . Peaks located at 284.8, 285.9, and 287.9 eV are corresponding to the C−C, C−O, and C=O peaks of the adventitious carbon, respectively.…”

mentioning

confidence: 99%

“…Peaks located at 284.8, 285.9, and 287.9 eV are corresponding to the C−C, C−O, and C=O peaks of the adventitious carbon, respectively. The CO 3 2− peak at 289.5 eV may come from the X‐ray‐induced decomposition of the oxalate . Similarly, the main O 1s peak at 532.1 eV corresponds to the O from C 2 O 4 2− .…”

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confidence: 99%

NiFe Oxalate Nanomesh Array with Homogenous Doping of Fe for Electrocatalytic Water Oxidation

Gao

Chen

et al. 2019

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NiFe‐based materials have shown impressive electrocatalytic activity for the oxygen evolution reaction (OER). The mutual effect between proximate Ni and Fe atoms is essential in regulating the electronic structure of the active site to boost the OER kinetics. Detailed studies confirm that the separated monometal phases in NiFe‐based materials are detrimental to OER. Thus, the high‐level blending of Ni and Fe in NiFe‐based OER electrocatalysts is critical. Herein, an NiFe oxalate nanomesh array based on solid solutions between nickel (II) oxalate and iron (II) oxalate is prepared through a facile surfactant‐free approach in the presence of the reductive oxalate anions. The integrated electrode can efficiently catalyze water oxidation to reach a current density of 50 mA cm−2 with a small overpotential of 203 mV in a 1.0 m KOH aqueous solution. The high efficiency can be attributed to the atomic level mix of Ni and Fe in the solid solutions and the hierarchical porous structure of the nanomesh array. These two aspects bring about fast kinetics, efficient mass diffusion, and quick charge transfer, which are the three major positive factors for a high‐performance heterogenous electrocatalyst.

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Surface analysis of transition metal oxalates: Damage aspects

Cited by 43 publications

References 52 publications

X-ray and ion irradiation effects on azurite, malachite and alizarin pictorial models

X-ray and ion irradiation effects on azurite, malachite and alizarin pictorial models

Controlling the Growth of Ni₃S₂ Anode with Tunable Sodium Storage

NiFe Oxalate Nanomesh Array with Homogenous Doping of Fe for Electrocatalytic Water Oxidation

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Surface analysis of transition metal oxalates: Damage aspects

Cited by 43 publications

References 52 publications

X-ray and ion irradiation effects on azurite, malachite and alizarin pictorial models

X-ray and ion irradiation effects on azurite, malachite and alizarin pictorial models

Controlling the Growth of Ni3S2 Anode with Tunable Sodium Storage

NiFe Oxalate Nanomesh Array with Homogenous Doping of Fe for Electrocatalytic Water Oxidation

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Product

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Controlling the Growth of Ni₃S₂ Anode with Tunable Sodium Storage