Probing the electronic nature of Co centers forming the planar ring in octa-nuclear Co complexes using X-ray absorption spectroscopy

Sarmah, Nirupamjit; Sharma, Deepa; Mehta, B. K.; Shrivastava, B. D.; Das, Barun; Zimina, Anna; Gaur, Abhijeet

doi:10.1016/j.molstruc.2022.133125

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…X-ray absorption spectroscopy (XAS) characterizations were carried out to provide further insights on the electronic structure and coordination environment of the Co atoms in CoP@C. [22] Figure 3 shows the Co k-edge X-ray absorption near-edge structure (XANES) and Fourier transform extended X-ray absorption fine structure (FT-EXAFS) spectra of CoP@C-700, Co 3 O 4 , Co foil, and CoO. As shown in Figure 3a, the absorption edge of CoP@C is obviously shifted to lower energy than that of Co 3 O 4 , but higher than that of CoO, indicating the increased electron density on Co atoms, and the valence of Co The decrease in coordination number is also confirmed in the Wavelet transform (WT) BE contour plot (Figure 3d).…”

Section: Structure and Morphology Characterizationsmentioning

confidence: 99%

CoP Quantum Dots Embedded in Carbon Polyhedra through Co─P─C Bonding Enabling High‐Energy Lithium‐Ion Capacitors

Li,

Xu,

Zhang

et al. 2024

Adv Funct Materials

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Phosphides with high theoretical capacity are considered ideal anode materials for lithium‐ion capacitors (LICs), but poor electronic conductivity as well as unsatisfied cyclic stability limits the performance of the phosphides. Here a covalently bonded CoP@C heterostructure is reported, which consists of 5 nm CoP quantum dots (QDs) like pomegranate seeds pinned in carbon polyhedron through interfacial Co─P─C bonding. The ultrafine size of CoP QDs provides more reactive sites and a shorten electrons/ions diffusion path, boosting the specific capacity. The Co─P─C bond induces the energy band variation of CoP and increases the interfacial charge density, bringing about fast kinetics. Besides, the Co─P─C bond introduces a robust pining effect among CoP QDs and carbon polyhedra, greatly improving the structure stability of 5 nm CoP QDs. The CoP@C heterostructure electrode exhibits high capacity (nearly 1000 mAh g−1) and superior cycling stability. It is worth noting that a prototyped LIC full‐cell of YP80//CoP@C presents an impressive high energy density of 172 Wh kg−1 and a power density of 10.8 kW kg−1. Moreover, the LIC possesses an ultra‐long life, retaining 80% after 20,000 cycles. This study offers an effective design for phosphides achieving fast kinetics and superior structure stability through an interfacial bonding approach.

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Section: Structure and Morphology Characterizationsmentioning

confidence: 99%

CoP Quantum Dots Embedded in Carbon Polyhedra through Co─P─C Bonding Enabling High‐Energy Lithium‐Ion Capacitors

Li,

Xu,

Zhang

et al. 2024

Adv Funct Materials

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“…3d quadrupole transition. [27][28][29] The intensity of a transition is proportional to both the transition probability and the density of states. 30 The transition probability of 1 s !…”

Section: Pre-edge Peakmentioning

confidence: 99%

Investigating local coordination and electronic nature of Cu centers in the copper complexes having aspartic and glutamic acids

Hinge,

Bairagi,

Yadav

et al. 2023

X-Ray Spectrometry

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X‐ray absorption fine structure (XAFS) at the Cu K‐edge in copper complexes of L‐aspartic acid (asp) and L‐glutamic acid (glu), namely, [Cu(L‐asp)(H2O)].H2O (1) and [Cu(L‐glu)(H2O)].H2O (2) have been investigated using synchrotron radiation. Though, the crystal structure of both of the complexes 1 and 2 have been studied earlier using x‐ray crystallography, it was considered worthwhile to study the coordination geometry and electronic nature of Cu metal center using XAFS. EXAFS analysis indicated that Cu has distorted tetragonal pyramidal and distorted octahedral coordination in complexes, respectively. The XANES spectra have been simulated for the Cu center in the complexes and compared with the experimental XANES spectra. Further, p‐DOS and d‐DOS calculated simultaneously for absorbing Cu metal center have been correlated with the features and shape of the simulated XANES spectra as well as the experimental spectra.

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Controllable ion design in flexible metal organic framework film for performance regulation of electrochemical biosensing

Wang,

Tan,

Zhao

et al. 2024

Biosensors and Bioelectronics

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Probing the electronic nature of Co centers forming the planar ring in octa-nuclear Co complexes using X-ray absorption spectroscopy

Cited by 3 publications

References 26 publications

CoP Quantum Dots Embedded in Carbon Polyhedra through Co─P─C Bonding Enabling High‐Energy Lithium‐Ion Capacitors

CoP Quantum Dots Embedded in Carbon Polyhedra through Co─P─C Bonding Enabling High‐Energy Lithium‐Ion Capacitors

Investigating local coordination and electronic nature of Cu centers in the copper complexes having aspartic and glutamic acids

Controllable ion design in flexible metal organic framework film for performance regulation of electrochemical biosensing

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