XPS detection of unusual Cu(II) to Cu(I) transition on the surface of complexes with redox-active ligands

Иванова, Т. М.; Maslakov, K. I.; Сидоров, А. А.; Кискин, М. А.; Linko, R. V.; Savilov, S. V.; Лунін, В. В.; Еременко, И. Л.

doi:10.1016/j.elspec.2019.06.010

Cited by 137 publications

(101 citation statements)

References 26 publications

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“…In Figure 2h, Auger Cu LMM spectrum is fitted with two peaks (569.9 eV and 568.59 eV), ascribed to Cu (I) and Cu (II) oxides, respectively. Meanwhile, the presence of Cu (I) oxides is also demonstrated by the two peaks (933.66 eV and 953.41 eV, Δ BE =19.75 eV) in Cu2p spectrum (Figure 2g) [53] . Lastly, the spectrum of Sn3d region (Figure 2i) has well separated spin‐orbit peaks at Sn3d 5/2 (486.60 eV) and Sn3d 3/2 (495.00 eV).…”

Section: Resultsmentioning

confidence: 84%

“…The fitting peak at 529.92 eV is a typical metal oxygen bond, while the other two correspond to organic CÀ O (531.76 eV) and C=O (533.00 eV), respectively. Herein, the former case undoubtedly suggests the formation of MOL on the outermost surface, which can be profoundly substantiated by the valent state of five metals [45][46][47][48][49][50][51][52][53][54][55] in HEA-NP@MOL/HCPC-2.0 ( Figure 2d…”

Section: Characterization Of Hea-np@mol/hcpcmentioning

confidence: 73%

“…Here, the peaks at 933.66 eV and 953.41 eV are assigned to Cu (II) oxides, evidenced by the observable satellite peaks at ∼943 eV and the Δ BE of 19.75 eV [50,51] . In addition, Auger Cu LMM spectrum (Fig 2 h) was used to distinguish between Cu, Cu (I) and Cu (II) due to the fact that chemical state differentiation can be difficult only from XPS and the Cu LMM spectrum has a bigger chemical shifts in contrast to Cu2p [52,53] . In Figure 2h, Auger Cu LMM spectrum is fitted with two peaks (569.9 eV and 568.59 eV), ascribed to Cu (I) and Cu (II) oxides, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…[47,48] Similarly, the Ni2p (Figure 2f) [49] The Cu2p spectrum ( Figure 2g) [50,51] In addition, Auger Cu LMM spectrum (Fig 2 h) was used to distinguish between Cu, Cu (I) and Cu (II) due to the fact that chemical state differentiation can be difficult only from XPS and the Cu LMM spectrum has a bigger chemical shifts in contrast to Cu2p. [52,53] In Figure 2h, Auger Cu LMM spectrum is fitted with two peaks (569.9 eV and 568.59 eV), ascribed to Cu (I) and Cu (II) oxides, respectively. Meanwhile, the presence of Cu (I) oxides is also demonstrated by the two peaks (933.66 eV and 953.41 eV, Δ BE = 19.75 eV) in Cu2p spectrum (Figure 2g).…”

Section: Characterization Of Hea-np@mol/hcpcmentioning

confidence: 99%

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Spontaneously Forming Oxide Layer of High Entropy Alloy Nanoparticles Deposited on Porous Carbons for Supercapacitors

et al. 2021

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High‐entropy alloy nanoparticles with a thin metal oxide layer, deposited onto hypercrosslinked polymer‐based carbon (HCPC), were synthesized through the adsorption of five metal ions in the hypercrosslinked polymers and subsequent in situ reduction of such ions (Fe2+, Co2+, Ni2+, Cu2+ and Sn2+), followed by a carbonization process. The as‐prepared composites exhibit an excellent specific capacitance (495.4 F/g at 0.5 A/g in 1 M KOH), a superior cycling stability (94.7 % of initial capacitance after 15000 cycles at 10 A/g), and ultrafast charge transport kinetics (88.9 % fast kinetic capacitance at 200 mV/s). These excellent electrochemical behaviors are attributed to the pseudocapacitance of the metal oxide layer spontaneously formed on the outermost surface of the composite, having a thickness at the nanometer scale. Such findings suggest that this simple strategy, combining multimetallic nanoparticles with porous carbon materials, has promising potential to improve specific capacitance and paves the way to develop both the preparation of high‐entropy alloys and supercapacitors with improved performance.

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Section: Resultsmentioning

confidence: 84%

Section: Characterization Of Hea-np@mol/hcpcmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Characterization Of Hea-np@mol/hcpcmentioning

confidence: 99%

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Spontaneously Forming Oxide Layer of High Entropy Alloy Nanoparticles Deposited on Porous Carbons for Supercapacitors

et al. 2021

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“…The content of Al 2 O 3 on AA2024‐T3 (34%) was larger than the content of Al(OH) 3 (8.4%) and AlOOH (27.2%), as shown in Table . Copper was present in two chemical states, as indicated by the peaks at 932 and 934 eV, assigned to Cu 2 O and CuO, and there was no hydroxidation state of copper. The content of CuO (19.4%) was larger than the Cu 2 O (11%) .…”

Section: Resultsmentioning

confidence: 99%

In Situ Electrochemical Atomic Force Microscopy and Auger Electro Spectroscopy Study on the Passive Film Structure of 2024‐T3 Aluminum Alloy Combined with a Density Functional Theory Calculation

Dong

Man

et al. 2019

Adv Eng Mater

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The initial growth of the passive films on the Al2CuMg particle and Al matrix in AA2024‐T3 are investigated by in situ electrochemical atomic force microscopy (ECAFM) and ex situ characterization techniques in citric acid. The passive films are mainly composed of Al2O3 (34%), Al(OH)3 (8.4%), AlOOH (27.2%), CuO (19.4%), and Cu2O (11%). ECAFM images display that the film on the Al2CuMg particle is flawed and loose. Auger electro spectroscopy (AES) results show that the thickness of the passive film on the Al2CuMg particle is 1.4 nm, which is thinner than that on the Al matrix (2.4 nm). The combined ECAFM and AES results demonstrate that the corrosion resistance of the passive film on the Al2CuMg is weaker than that on the Al matrix. According to the density functional theory (DFT) calculations, the average charge transfer and adsorption energy of the adsorbates (O2−/OH−/H2O) on the Al surfaces are larger than that on the Al2CuMg surfaces, meaning that O2 and H2O preferably dissociate and adsorb on the Al surfaces. Moreover, the electronic interactions between the adsorbates and Al surfaces are stronger. This is the reason that the growth rate of the passive film on the Al2CuMg particle is slower at initial stages.

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Tailoring Addition Sequence of Metal Ions in Precursor Solution Drives Highly Efficient Kesterite Solar Cells

Zhou,

Sun,

et al. 2024

Adv Funct Materials

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The unsatisfactory material quality of absorber is an important factor limiting the development of Cu2ZnSn(S,Se)4 (CZTSSe) thin‐film solar cells, including poor crystallization, multi‐layer structure, and various defects. Here, an effective strategy to enhance the quality of kesterite absorber and improve the performance of solar cells is proposed by tailoring the additional sequence of metal ions in precursor solution. With an addition sequence S─Sn─Cu─Zn (STCZ), higher values of Cu+/Cu2+ and Sn4+/Sn2+ ratios are obtained, and the surface grain growth is modulated into an inclined growth mode. Consequently, the decomposition of CZTSSe bulk is suppressed and its final morphology presents mainly as large grains spanning across the absorber. The quality of absorber and its interface is enhanced with activating the desirable shallow acceptor and reducing recombination center defects. An encouraging efficiency of over 12% for CZTSSe solar cells with increased short‐circuit current density and fill factor is realized. This novel strategy provides insight into crystallization mechanism of kesterite photovoltaic material and has guiding significance for further improving material crystallization and absorber quality.

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XPS detection of unusual Cu(II) to Cu(I) transition on the surface of complexes with redox-active ligands

Cited by 137 publications

References 26 publications

Spontaneously Forming Oxide Layer of High Entropy Alloy Nanoparticles Deposited on Porous Carbons for Supercapacitors

Spontaneously Forming Oxide Layer of High Entropy Alloy Nanoparticles Deposited on Porous Carbons for Supercapacitors

In Situ Electrochemical Atomic Force Microscopy and Auger Electro Spectroscopy Study on the Passive Film Structure of 2024‐T3 Aluminum Alloy Combined with a Density Functional Theory Calculation

Tailoring Addition Sequence of Metal Ions in Precursor Solution Drives Highly Efficient Kesterite Solar Cells

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