The new X-ray absorption fine-structure beamline with sub-second time resolution at the Taiwan Photon Source

Pao, C. W.; Chen, Jeng-Lung; Lee, Jyh Fu; Tsai, Meng‐Che; Huang, Chi Yi; Chiu, C. C.; Chang, Chao; Chiang, Liang Chih; Huang, Y. Y.

doi:10.1107/s1600577521001740

Cited by 26 publications

(18 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The in situ Bi L 3 - and ex situ Pd K -edge XAS spectra were performed in fluorescence mode by using a pin diode and a 7-element silicon drift detector, respectively. TPS-44A is equipped with a quick-scanning monochromator (Q-Mono), which allows both conventional step-by-step (s-scan) and on-the-fly scans (q-scan) at the millisecond timescale for XAS . Each in situ spectrum was collected with Q-Mono oscillating at 1 Hz for 5 min.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Production of Formic Acid in Electrochemical CO₂ Reduction over Pd-Doped BiOCl Nanosheets

Hsieh

Chen

Lyu

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Bismuth oxyhalides (BiOX, X = F, Cl, Br, I) are emerging energy materials because of their remarkable catalytic activity. The BiOX compounds usually have a tetragonal type crystal structure with unique layered morphology consisting of [X−Bi−O−Bi−X] sheets. Although the BiOX nanosheets exposed with {001} facets perform superior photoactivity, there is lack of understanding about their capability in the electrochemical CO 2 reduction reaction (CO 2 RR). Herein, we adopt wet-chemical syntheses to make 2D BiOCl and Pd-doped BiOCl nanosheets for CO 2 RR. In the results, formic acid is the only one kind of product converted from CO 2 along with H 2 gas from water reduction over both BiOCl and Pd-doped BiOCl nanosheets. By thorough analyses with ex situ and in situ spectroscopy, the results reflect that (1) metallic Bi 0 atoms generated by the applied negative potentials serve as the catalytic sites for the hydrogen evolution reaction (HER) and CO 2 RR and (2) the existence of doped Pd ions in the BiOCl structure reduces the barrier of charge transfer over the nanosheets, which enhances HER and CO 2 RR activities. We believe that the observations are important references for making catalysts toward CO 2 RR performance.

show abstract

Section: Methodsmentioning

confidence: 99%

“…TPS-44A is equipped with a quick-scanning monochromator (Q-Mono), which allows both conventional step-by-step (s-scan) and on-the-fly scans (q-scan) at the millisecond timescale for XAS. 25 Each in situ spectrum was collected with Q-Mono oscillating at 1 Hz for 5 min. Raw data were processed using the Demeter package.…”

Section: ■ Introductionmentioning

confidence: 99%

Enhanced Production of Formic Acid in Electrochemical CO₂ Reduction over Pd-Doped BiOCl Nanosheets

Hsieh

Chen

Lyu

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…A full QXAFS spectrum can be acquired in 500 ms using q‐scan at the Q‐Mono oscillation frequency of 2 Hz in TPS 44A endstation. [ 54 ] In order to increase the signal to noise ratio, each Ni, Co, Mn K‐edge QXAFS spectrum was averaged by 120 spectra in this study, i.e., the time resolution was 60 s. The pure Mn, Co, and Ni foil were used to calibrate the incident photon energy. The QXAFS results obtained in transmission mode were analyzed with DEMETER software package.…”

Section: Methodsmentioning

confidence: 99%

Modulating the Voltage Decay and Cationic Redox Kinetics of Li‐Rich Cathodes via Controlling the Local Electronic Structure

Ibrahim

Chi

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Li-rich layered oxide cathodes with conventional transition metal cation and unique oxygen anion redox reactions deliver high capacities in Li-ion batteries. However, the oxygen redox process causes the oxygen release, voltage fading/hysteresis, and sluggish electrochemical kinetics, which undermine the performance of these materials. By combining operando quick-scanning X-ray absorption spectroscopy with online gas chromatography, the effect of the local electronic structure is elucidated on the reaction mechanism and electrochemical kinetics of Li-rich cathodes. The local electronic structure of Li-rich cathodes varies with the excess Li (i.e., Li 2 MnO 3 phase) and Ni contents. Compared to the Li-rich cathodes with higher amounts of Li 2 MnO 3 phase (high excess lithium content (HLC) cathode), those with lower Li 2 MnO 3 contents (low excess lithium content (LLC) cathode) exhibit reversible anion redox reactions and suppressed voltage hysteresis. The cation oxidation process of LLC cathode is kinetically slower than that of HLC cathode and the cation oxidation potential is shifted, likely due to the local coordination associated with different Li/O ratios. The obtained insights into the effect of local electronic structure on the reaction mechanism and kinetics provide a better understanding and control of Li-rich cathodes.

show abstract

“…Core‐level XPS and VB‐PES were carried out at the 09A‐undulator beamline at Taiwan Light Source, National Synchrotron Radiation Research Center (NSRRC), Hsinchu, Taiwan. V K ‐edge XANES/EXAFS, Sn K ‐edge EXAFS in TFY mode, and V L α,β RIXS were performed at Taiwan Photon Source 44A [ 60 ] and 45A2 beamlines [ 61 ] at NSRRC as well. The resolution was set to ≈0.1 eV at photon energies of 480–60 eV for Sn M 5,4 − , V L 3,2 − , O K ‐edge XANES, and ≈0.2 eV at photon energies of 2460 eV for the S K ‐edge XANES measurements.…”

Section: Methodsmentioning

confidence: 99%

Bandgap Shrinkage and Charge Transfer in 2D Layered SnS₂ Doped with V for Photocatalytic Efficiency Improvement

Shelke

Wang

Chiou

et al. 2021

Small

View full text Add to dashboard Cite

Effects of electronic and atomic structures of V‐doped 2D layered SnS2 are studied using X‐ray spectroscopy for the development of photocatalytic/photovoltaic applications. Extended X‐ray absorption fine structure measurements at V K‐edge reveal the presence of VO and VS bonds which form the intercalation of tetrahedral OVS sites in the van der Waals (vdW) gap of SnS2 layers. X‐ray absorption near‐edge structure (XANES) reveals not only valence state of V dopant in SnS2 is ≈4+ but also the charge transfer (CT) from V to ligands, supported by V Lα,β resonant inelastic X‐ray scattering. These results suggest V doping produces extra interlayer covalent interactions and additional conducting channels, which increase the electronic conductivity and CT. This gives rapid transport of photo‐excited electrons and effective carrier separation in layered SnS2. Additionally, valence‐band photoemission spectra and S K‐edge XANES indicate that the density of states near/at valence‐band maximum is shifted to lower binding energy in V‐doped SnS2 compare to pristine SnS2 and exhibits band gap shrinkage. These findings support first‐principles density functional theory calculations of the interstitially tetrahedral OVS site intercalated in the vdW gap, highlighting the CT from V to ligands in V‐doped SnS2.

show abstract

The new X-ray absorption fine-structure beamline with sub-second time resolution at the Taiwan Photon Source

Cited by 26 publications

References 24 publications

Enhanced Production of Formic Acid in Electrochemical CO₂ Reduction over Pd-Doped BiOCl Nanosheets

Enhanced Production of Formic Acid in Electrochemical CO₂ Reduction over Pd-Doped BiOCl Nanosheets

Modulating the Voltage Decay and Cationic Redox Kinetics of Li‐Rich Cathodes via Controlling the Local Electronic Structure

Bandgap Shrinkage and Charge Transfer in 2D Layered SnS₂ Doped with V for Photocatalytic Efficiency Improvement

Contact Info

Product

Resources

About

The new X-ray absorption fine-structure beamline with sub-second time resolution at the Taiwan Photon Source

Cited by 26 publications

References 24 publications

Enhanced Production of Formic Acid in Electrochemical CO2 Reduction over Pd-Doped BiOCl Nanosheets

Enhanced Production of Formic Acid in Electrochemical CO2 Reduction over Pd-Doped BiOCl Nanosheets

Modulating the Voltage Decay and Cationic Redox Kinetics of Li‐Rich Cathodes via Controlling the Local Electronic Structure

Bandgap Shrinkage and Charge Transfer in 2D Layered SnS2 Doped with V for Photocatalytic Efficiency Improvement

Contact Info

Product

Resources

About

Enhanced Production of Formic Acid in Electrochemical CO₂ Reduction over Pd-Doped BiOCl Nanosheets

Enhanced Production of Formic Acid in Electrochemical CO₂ Reduction over Pd-Doped BiOCl Nanosheets

Bandgap Shrinkage and Charge Transfer in 2D Layered SnS₂ Doped with V for Photocatalytic Efficiency Improvement