Soft x-ray absorption spectroscopy on Co doped ZnO: structural distortions and electronic structure

Kowalik, I.A.; Guziewicz, E.; Godlewski, M.; Arvanitis, D.

doi:10.1088/1742-6596/712/1/012104

Cited by 7 publications

(11 citation statements)

References 13 publications

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“…Similar angular dependence has been observed in ZnO microrod arrays [13] and ZnO:Co thin films [14].…”

Section: O K Edge: Allowed Transitions and Polarization Dependencesupporting

confidence: 82%

Polarized dependence of soft X-ray absorption near edge structure of ZnO films implanted by Yb

Syryanyy

Zając²,

Guziewicz

et al. 2022

Materials Science in Semiconductor Processing

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“…Similar angular dependence has been observed in ZnO microrod arrays [13] and ZnO:Co thin films [14].…”

Section: O K Edge: Allowed Transitions and Polarization Dependencesupporting

confidence: 82%

Polarized dependence of soft X-ray absorption near edge structure of ZnO films implanted by Yb

Syryanyy

Zając²,

Guziewicz

et al. 2022

Materials Science in Semiconductor Processing

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“…22 To investigate the origin of the fast K 2 S oxidation kinetics on the S/SA-NC cathode from the electronic structure, ex situ NEXAFS characterizations were carried out. 23 The white line area is proportional to the number of empty Co 3d final states. Therefore, the decrease in the Co L-edge white line area for SA-NC indicates that the Co valence state decreases gradually in the discharge process and reaches the lowest level at 0.5 V (Figure 4a).…”

mentioning

confidence: 53%

“…To investigate the origin of the fast K 2 S oxidation kinetics on the S/SA-NC cathode from the electronic structure, ex situ NEXAFS characterizations were carried out . The white line area is proportional to the number of empty Co 3d final states.…”

mentioning

confidence: 92%

Catalytic Oxidation of K₂S via Atomic Co and Pyridinic N Synergy in Potassium–Sulfur Batteries

Shan

Chao

et al. 2021

J. Am. Chem. Soc.

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Potassium−sulfur batteries hold practical promise for next-generation batteries because of their high theoretical gravimetric energy density and low cost. However, significant impediments are the sluggish K 2 S oxidation kinetics and a lack of atomic-level understanding of K 2 S oxidation. Here, for the first time, we report the catalytic oxidation of K 2 S on a sulfur host with Co single atoms immobilized on nitrogen-doped carbon. On the basis of combined spectroscopic characterizations, electrochemical evaluation, and theoretical computations, we show a synergistic effect of dynamic Co−S and N−K interactions to catalyze K 2 S oxidation. The resultant potassium−sulfur battery exhibited high capacities of 773 and 535 mAh g −1 under high current densities of 1 and 2 C, respectively. These findings provide atomic-scale insights for the rational design of highly efficient sulfur hosts.

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“…The K-edge energy also shows a lower shift in intensity with cobalt content, implying the Co-valence state is nearly close to Co 2+ . The white line peak intensity of cobalt bulk for the Ni–Co carbonate hydroxide complex reveals an increase with cobalt content, implying the decrease in the local disorder of the nearest-neighbor atom of the Co bulk …”

Section: Resultsmentioning

confidence: 99%

“…For the absorption K-edge of cobalt (Figure 9b), the K-edge energy of the as-prepared cobalt carbonate hydroxide is nearly close to that the Co The white line peak intensity of cobalt bulk for the Ni−Co carbonate hydroxide complex reveals an with cobalt content, implying the decrease in the local disorder of the nearest-neighbor atom of the Co bulk. 61 To understand the charge−discharge mechanism, the optimized sample at Ni/Co ratio of 1:2 is further investigated the change of valence behavior during CV cycling at 1 mV s −1 . Figure 10a shows that the asymmetrical cell of nickel−cobalt carbonate hydroxide is fabricated and monitored with the XANES technique at each CV measurement point.…”

Section: Resultsmentioning

confidence: 99%

Controllable Morphology of Sea-Urchin-like Nickel–Cobalt Carbonate Hydroxide as a Supercapacitor Electrode with Battery-like Behavior

Poompiew

Pattananuwat

2021

ACS Omega

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Nickel–cobalt carbonate hydroxide with a three-dimensional (3D) sea-urchin-like structure was successfully developed by the hydrothermal process. The obtained structure enables the enhancement of charge/ion diffusion for the high-performance supercapacitor electrodes. The mole ratio of nickel to cobalt plays a vital role in the densely packed sea-urchin-like structure formation and electrochemical properties. At optimized nickel/cobalt mole ratio (1:2), the highest specific capacitance of 950.2 F g–1 at 1 A g–1 and the excellent cycling stability of 178.3% after 3000 charging/discharging cycles at 40 mV s–1 are achieved. This nickel–cobalt carbonate hydroxide electrode yields an energy density in the range of 42.9–15.8 Wh kg–1, with power density in the range of 285.0–2849.9 W kg–1. The charge/discharge mechanism at the atomic level as monitored by time-resolved X-ray absorption spectroscopy (TR-XAS) indicates that the high capacitance behavior in a nickel–cobalt carbonate hydroxide is mainly dominated by cobalt carbonate hydroxide.

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Soft x-ray absorption spectroscopy on Co doped ZnO: structural distortions and electronic structure

Cited by 7 publications

References 13 publications

Polarized dependence of soft X-ray absorption near edge structure of ZnO films implanted by Yb

Polarized dependence of soft X-ray absorption near edge structure of ZnO films implanted by Yb

Catalytic Oxidation of K₂S via Atomic Co and Pyridinic N Synergy in Potassium–Sulfur Batteries

Controllable Morphology of Sea-Urchin-like Nickel–Cobalt Carbonate Hydroxide as a Supercapacitor Electrode with Battery-like Behavior

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Soft x-ray absorption spectroscopy on Co doped ZnO: structural distortions and electronic structure

Cited by 7 publications

References 13 publications

Polarized dependence of soft X-ray absorption near edge structure of ZnO films implanted by Yb

Polarized dependence of soft X-ray absorption near edge structure of ZnO films implanted by Yb

Catalytic Oxidation of K2S via Atomic Co and Pyridinic N Synergy in Potassium–Sulfur Batteries

Controllable Morphology of Sea-Urchin-like Nickel–Cobalt Carbonate Hydroxide as a Supercapacitor Electrode with Battery-like Behavior

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Product

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Catalytic Oxidation of K₂S via Atomic Co and Pyridinic N Synergy in Potassium–Sulfur Batteries