Quantitative analysis of Ni2+/Ni3+ in Li[NixMnyCoz]O2 cathode materials: Non-linear least-squares fitting of XPS spectra

Fu, Zewei; Hu, Jianwen; Hu, Wenlong; Yang, Shunfeng; Luo, Yunfeng

doi:10.1016/j.apsusc.2018.02.114

Cited by 203 publications

(113 citation statements)

References 34 publications

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“…37 In addition, the energy of this peak also matches oxygen bound in CO 3 2À in the interlayer. 38 As the 531 eV peak is increasing slightly after the OER and more markedly, after the HER, consistent with the Ni 2p satellites, and that the concentration of inter-layer CO 3 2À is not expected to change for a fixed stoichiometry and carbon free electrolyte, both these observations point to a slight increase in the valence for Ni after the OER and a more pronounced valence increase after the HER. As the high energy peak is significantly stronger for H-NiFe LDH, it indicates a correlation between increased valence in nickel in the catalyst and the favorable HER efficiency.…”

Section: Materials Analysissupporting

confidence: 59%

Direct observation of active catalyst surface phases and the effect of dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting

Qiu

Tai

Niklasson

et al. 2019

Energy Environ. Sci.

514

326

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Section: Materials Analysissupporting

confidence: 59%

Direct observation of active catalyst surface phases and the effect of dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting

Qiu

Tai

Niklasson

et al. 2019

Energy Environ. Sci.

514

326

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“…To reveal the oxidation states of transition metals in K 0.44 Ni 0.22 Mn 0.78 O 2 , X‐ray photoelectron spectroscopy (XPS) was further employed. The binding energies (BE) located at 871.7 and 854.4 eV in Ni 2p high‐resolution XPS, together with two satellite peaks at their higher energy sides, can be ascribed to 2p 1/2 and 2p 3/2 of divalent Ni ions, respectively (Figure c) . Correspondingly, Mn 2p 1/2 and 2p 3/2 are located at 653.6 and 642.3 eV, respectively, consistent with the typical values of Mn 4+ ions (Figure d) 15b…”

Section: Resultssupporting

confidence: 68%

Layered P2‐Type K_0.44Ni_0.22Mn_0.78O₂ as a High‐Performance Cathode for Potassium‐Ion Batteries

Zhang

Yang

et al. 2019

Adv Funct Materials

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Potassium-ion batteries (KIBs) are emerging as one of the most promising candidates for large-scale energy storage owing to the natural abundance of the materials required for their fabrication and the fact that their intercalation mechanism is identical to that of lithium-ion batteries. However, the larger ionic radius of K + is likely to induce larger volume expansion and sluggish kinetics, resulting in low specific capacity and unsatisfactory cycle stability. A new Ni/ Mn-based layered oxide, P2-type K 0.44 Ni 0.22 Mn 0.78 O 2 , is designed and synthesized. A cathode designed using this material delivers a high specific capacity of 125.5 mAh g −1 at 10 mA g −1 , good cycle stability with capacity retention of 67% over 500 cycles and fast kinetic properties. In situ X-ray diffraction recorded for the initial two cycles reveals single solid-solution processes under P2-type framework with small volume change of 1.5%. Moreover, a cathode electrolyte interphase layer is observed on the surface of the electrode after cycling with possible components of K 2 CO 3 , RCO 2 K, KOR, KF, etc. A full cell using K 0.44 Ni 0.22 Mn 0.78 O 2 as the cathode and soft carbon as the anode also exhibits exceptional performance, with capacity retention of 90% over 500 cycles as well as superior rate performance. These findings suggest P2-K 0.44 Ni 0.22 Mn 0.78 O 2 is a promising candidate as a high-performance cathode for KIBs.

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“…These patterns reveal that Co/P25-Ar sample only contains Co (II) [37]. The Ni 2p 3/2 spectra (Figure 5c) shows a main peak at 855.6 eV, ascribed to Ni (II) in an oxygen environment [45], a minor peak at 857.3 eV that corresponds to Ni (III) species [46], and a satellite peak, at 861.3 eV, that supports the presence of divalent nickel [45]. Finally, the Cu 2p 3/2 XPS spectrum (Figure 5d) shows two contributions at 932.4 eV and 934.0 eV, that can be assigned, respectively, to Cu (I) and Cu (II) [43,47].…”

Section: Resultsmentioning

confidence: 99%

TiO2 Modification with Transition Metallic Species (Cr, Co, Ni, and Cu) for Photocatalytic Abatement of Acetic Acid in Liquid Phase and Propene in Gas Phase

et al. 2018

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The commercial P25 titania has been modified with transition metallic species (Cr, Co, Ni, and Cu), added by impregnation with aqueous solutions of the corresponding nitrates. The preparation procedure also includes a heat treatment (500 °C) in argon to decompose the nitrates, remove impurities and to strengthen the metal–TiO2 interaction. The catalysts have been thoroughly characterized using N2 adsorption, scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-visible diffuse-reflectance spectroscopy (UV-vis DRS) and X-ray photoelectron spectroscopy (XPS), and have been tested in the aqueous phase decomposition of acetic acid and in the gas phase oxidation of propene, using an irradiation source of 365 nm in both cases. The photocatalytic activity of the four metal-containing catalysts varies with the nature of the metallic species and follows a similar trend in the two tested reactions. The effect of the nature of the added metallic species is mainly based on the electrochemical properties of the supported species, being Cu/P25 (the sample that contains copper) the best performing catalyst. In the photodecomposition of acetic acid, all the metal-containing samples are more active than bare P25, while in the gas phase oxidation of propene, bare P25 is more active. This has been explained considering that the rate-determining steps are different in gas and liquid media.

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Quantitative analysis of Ni2+/Ni3+ in Li[NixMnyCoz]O2 cathode materials: Non-linear least-squares fitting of XPS spectra

Cited by 203 publications

References 34 publications

Direct observation of active catalyst surface phases and the effect of dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting

Direct observation of active catalyst surface phases and the effect of dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting

Layered P2‐Type K_0.44Ni_0.22Mn_0.78O₂ as a High‐Performance Cathode for Potassium‐Ion Batteries

TiO2 Modification with Transition Metallic Species (Cr, Co, Ni, and Cu) for Photocatalytic Abatement of Acetic Acid in Liquid Phase and Propene in Gas Phase

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Quantitative analysis of Ni2+/Ni3+ in Li[NixMnyCoz]O2 cathode materials: Non-linear least-squares fitting of XPS spectra

Cited by 203 publications

References 34 publications

Direct observation of active catalyst surface phases and the effect of dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting

Direct observation of active catalyst surface phases and the effect of dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting

Layered P2‐Type K0.44Ni0.22Mn0.78O2 as a High‐Performance Cathode for Potassium‐Ion Batteries

TiO2 Modification with Transition Metallic Species (Cr, Co, Ni, and Cu) for Photocatalytic Abatement of Acetic Acid in Liquid Phase and Propene in Gas Phase

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Layered P2‐Type K_0.44Ni_0.22Mn_0.78O₂ as a High‐Performance Cathode for Potassium‐Ion Batteries