Article
Chemistry, Physical
Daniel Hauser, Christoph Griesser, Eva-Maria Wernig, Thomas Goetsch, Johannes Bernardi, Julia Kunze-Liebhaeuser, Simon Penner
Summary: This study investigates the effect of varying key reaction parameters on the stoichiometry of zirconium oxy-carbide films prepared by reactive magnetron sputtering. The composition of the films was confirmed by depth profiling X-ray photoelectron spectroscopy and electron microscopy analysis. The study also demonstrates the formation of well-defined metal/oxy-carbide interfaces by embedding ordered Cu particles in zirconium oxy-carbide matrices.
SURFACES AND INTERFACES
(2022)
Article
Multidisciplinary Sciences
J. Niskanen, A. Vladyka, J. Niemi, C. J. Sahle
Summary: In this study, we explore the sensitivity of several core-level spectroscopic methods to the atomistic structure using water molecule as a test system. We define a metric to measure the magnitude of spectral change as a function of structure, which enables us to identify structural regions with high spectral sensitivity. By employing machine-learning emulator-based decomposition of structural parameter space, we are able to recover more spectral variance and identify spectroscopically dominant degrees of freedom.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Chemistry, Physical
Yucheng Li, Liyu Zhu, Jingyang Zhao, Mengjie Qiu, Jing Liu, Jing He, Luying Wang, Jiandu Lei, Weiqian Tian, Long Rong
Summary: A high-efficiency nickel-iron bimetallic catalyst with excellent hydrogenation performance and stability was synthesized. The introduction of Fe element formed a protective NiFe2O4 layer on the catalyst surface, enhancing hydrogen adsorption capacity and resistance to oxidation. The introduction of Na element further improved the purity of the catalyst and the interaction between Ni and Fe, leading to enhanced hydrogenation performance. The reaction mechanism was systematically investigated using density functional theory (DFT) calculations.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Shivendra Kumar Jaiswal, Jitendra Kumar
Summary: The study investigated the X-ray photoelectron spectra, electrical conductivity, and oxygen permeability of sol-gel-derived (Ba0.5Sr0.5)(Zn eta Fe1-eta)O3-xi compounds. The results showed that zinc insertion retains the perovskite-type cubic phase, limits (xi) value, lowers conductivity, and reduces oxygen permeability while providing structural stability. Additionally, XPS data indicated a decrease in Fe4+ species compared to Fe3+ ions, an increase in anion vacancies, and differences in three types of oxygen ions with varying binding energies.
Article
Chemistry, Physical
Maxim K. Rabchinskii, Svyatoslav D. Saveliev, Dina Yu. Stolyarova, Maria Brzhezinskaya, Demid A. Kirilenko, Marina Baidakova, Sergei A. Ryzhkov, Vladimir V. Shnitov, Victor V. Sysoev, Pavel N. Brunkov
Summary: This study demonstrates the modulation of N species by tailoring the functionalization and atomic structure of graphene derivatives prior to chemical N-doping. Thermal annealing at moderate temperatures was shown to readjust the composition of N-species in graphene derivatives regardless of their chemistry, nanostructure, and the initial distribution of the N-species. The oxidation of the graphene layer governs the manifestation of pi* resonances and configuration of sigma* resonance.
Article
Materials Science, Ceramics
Ayano Nakamoto, Kohta Nambu, Hiroshi Masuda, Hidehiro Yoshida
Summary: Undoped Y2O3 polycrystals were densified by flash sintering under DC or AC electric field with varying holding times up to 60 min. The chemical bonding state and crystal structure were investigated by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively. DC flash sintering with longer holding times (>= 30 min) resulted in blackening in cathodic regions, indicating the electrode-dependent introduction of neutral oxygen vacancies. The Y 3d3/2 and Y 3d5/2 binding energies decreased with increasing holding time in both DC- and AC-flash-sintered Y2O3 specimens, regardless of polarity, indicating that positively charged oxygen vacancies were introduced by the flash sintering in an electrode-independent manner, even under DC electric field. XRD analysis revealed short-range structural fluctuations in flash-sintered specimens with longer holding times. These electrode-dependent and independent point defect generations under electric fields may be related to the enhanced atomic diffusion during flash sintering.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Zhichao Song, Jun Zhang, Yan Wang, Jianping Li
Summary: SnO2 nanomaterials and SnO2/Li2SnO3 composite nanomaterials doped with different Li contents were synthesized via a one-step thermal evaporation method. The increase of Li doping resulted in changes in the structure and properties, as observed in X-ray diffraction, Raman scattering, and X-ray photoelectron spectroscopy.
CERAMICS INTERNATIONAL
(2021)
Article
Energy & Fuels
Ren Zou, Zhiwen Tang, Xiaolan Chen, Zhaohui Li, Gangtie Lei
Summary: This study synthesizes calcium-doped manganese monoxide through a one-step solid-phase reaction and demonstrates that calcium doping significantly improves the formation of manganese defects and prolongs cycling stability. The use of calcium-doped manganese monoxide cathode in aqueous zinc-ion batteries shows high specific capacity and long-term cycling performance.
Article
Chemistry, Multidisciplinary
Darren M. Driscoll, Sydney N. Lavan, Milena Zorko, Paul C. Redfern, Stefan Ilic, Garvit Agarwal, Timothy T. Fister, Rajeev S. Assary, Lei Cheng, Dusan Strmcnik, Mahalingam Balasubramanian, Justin G. Connell
Summary: As the search for new battery chemistries expands, understanding and controlling the working cation solvation structure is key to enabling improved stability and reversibility. In this work, an emergent solvation behavior is discovered in multivalent electrolytes, allowing for the modification of electrochemical response and activating additional redox species. This suggests a new framework for electrolyte design, enabling profound changes to the electrochemical behavior of the system.
Article
Materials Science, Multidisciplinary
Ashutosh Kumar, David Berardan, Diana Dragoe, Eric Riviere, Tomohiro Takayama, Hidenori Takagi, Nita Dragoe
Summary: This study presents detailed investigations of the structural, magnetic, and electronic transport properties of hole-doped high-entropy rare-earth manganites. The high-entropy samples, synthesized using the solid-state technique, show a change in crystal structure with increasing Sr substitution. A rhombohedral structure exhibits prominent ferromagnetic ordering, originating from the dominant double exchange mechanism. The electrical resistivity of high-entropy samples is larger than those of La1_xSrxMnO3, attributed to the enhanced structural distortion.
MATERIALS TODAY PHYSICS
(2023)
Article
Multidisciplinary Sciences
Heming Liu, Ruikuan Xie, Yuting Luo, Zhicheng Cui, Qiangmin Yu, Zhiqiang Gao, Zhiyuan Zhang, Fengning Yang, Xin Kang, Shiyu Ge, Shaohai Li, Xuefeng Gao, Guoliang Chai, Le Liu, Bilu Liu
Summary: Constructing stable electrodes that can operate at large current density is crucial for industrial water electrolysis. A mechanically-stable, all-metal, and highly active CuMo6S8/Cu electrode is created by in-situ reaction between MoS2 and Cu, achieving a large current density of 2500 mA/cm(-2) at a small overpotential and operating stably for over 100 hours.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Paul Plate, Christian Hoehn, Ulrike Bloeck, Peter Bogdanoff, Sebastian Fiechter, Fatwa F. Abdi, Roel van de Krol, Aafke C. Bronneberg
Summary: The study shows that manganese oxide films thinner than 1.5 nm are not oxygen evolution reaction (OER) active, while thicker films can serve as active catalysts for OER. One Mn-III,Mn-IV-O monolayer is sufficient to achieve oxygen evolution under alkaline conditions. The results provide important new design criteria for ultrathin manganese oxide oxygen evolution catalysts.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Giovanni Chemello, Xenia Knigge, Dmitri Ciornii, Benjamen P. Reed, Andrew J. Pollard, Charles A. Clifford, Tom Howe, Neil Vyas, Vasile-Dan Hodoroaba, Joerg Radnik
Summary: The influence of the morphology of graphene particles on XPS results was studied. It was found that the size of the particles affects the degree of functionalization, and only the combination of XPS and HAXPES allows detection of the functionalization process and provides new insights.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Atsushi Hariki, Keisuke Higashi, Tatsuya Yamaguchi, Jiebin Li, Curran Kalha, Manfred Mascheck, Susanna K. Eriksson, Tomas Wiell, Frank M. F. de Groot, Anna Regoutz
Summary: This paper explores the satellites of the Ti 1s and 2p core level spectra of SrTiO3 and TiO2 using hard x-ray PES. The theoretical analysis emphasizes the importance of higher-order Ti-O charge-transfer processes and provides a robust prescription for using the computationally cheap cluster model in fitting analyses of core level spectra.
Article
Materials Science, Ceramics
Amit Kumar Mauraya, Debashrita Mahana, Gaurav Jhaa, Bipul Kumar Pradhan, Shweta Tomer, Preetam Singh, Sunil Singh Kushvaha, Senthil Kumar Muthusamy, Sunil Singh Kushvaha, Senthil Kumar Muthusamy
Summary: Heterojunction-based gas sensors, constructed by combining vacuum evaporation and r.f. sputtering or atomic layer deposition techniques, show enhanced sensing characteristics and selectivity towards CO gas. The ZnO/SnO2 heterojunction exhibits 6-fold enhancement in sensing response compared to bare SnO2 films, with fast response time and low limit of detection.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
J. Xu, D. H. Ji, Z. Z. Li, W. H. Qi, G. D. Tang, Z. F. Shang, X. Y. Zhang
JOURNAL OF ALLOYS AND COMPOUNDS
(2015)
Article
Physics, Condensed Matter
G. D. Tang, Z. F. Shang, X. Y. Zhang, J. Xu, Z. Z. Li, C. M. Zhen, W. H. Qi, L. L. Lang
PHYSICA B-CONDENSED MATTER
(2015)
Article
Physics, Condensed Matter
J. Xu, L. Ma, Z. Z. Li, L. L. Lang, W. H. Qi, G. D. Tang, L. Q. Wu, L. C. Xue, G. H. Wu
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2015)
Article
Nanoscience & Nanotechnology
L. C. Xue, L. L. Lang, J. Xu, Z. Z. Li, W. H. Qi, G. D. Tang, L. Q. Wu
Article
Physics, Condensed Matter
L. C. Xue, L. Q. Wu, S. Q. Li, Z. Z. Li, G. D. Tang, W. H. Qi, X. S. Ge, L. L. Ding
PHYSICA B-CONDENSED MATTER
(2016)
Article
Physics, Multidisciplinary
L. Q. Wu, W. H. Qi, X. S. Ge, D. H. Ji, Z. Z. Li, G. D. Tang, W. Zhong
Article
Nanoscience & Nanotechnology
X. S. Ge, Z. Z. Li, W. H. Qi, D. H. Ji, G. D. Tang, L. L. Ding, J. J. Qian, Y. N. Du
Article
Chemistry, Multidisciplinary
J. J. Qian, W. H. Qi, Z. Z. Li, L. Ma, G. D. Tang, Y. N. Du, M. Y. Chen, G. H. Wu, F. X. Hu
Article
Nanoscience & Nanotechnology
W. H. Qi, Z. Z. Li, L. Ma, G. D. Tang, G. H. Wu
Article
Physics, Applied
G. D. Tang, D. H. Ji, Y. X. Yao, S. P. Liu, Z. Z. Li, W. H. Qi, Q. J. Han, X. Hou, D. L. Hou
APPLIED PHYSICS LETTERS
(2011)
Article
Physics, Applied
L. L. Lang, J. Xu, W. H. Qi, Z. Z. Li, G. D. Tang, Z. F. Shang, X. Y. Zhang, L. Q. Wu, L. C. Xue
JOURNAL OF APPLIED PHYSICS
(2014)
Article
Physics, Condensed Matter
X. Y. Zhang, J. Xu, Z. Z. Li, W. H. Qi, G. D. Tang, Z. F. Shang, D. H. Ji, L. L. Lang
PHYSICA B-CONDENSED MATTER
(2014)
Article
Materials Science, Multidisciplinary
Z. Z. Li, W. H. Qi, L. Ma, G. D. Tang, G. H. Wu, F. X. Hu
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2019)
Article
Physics, Applied
G. D. Tang, D. L. Hou, W. Chen, P. Hao, G. H. Liu, S. P. Liu, X. L. Zhang, L. Q. Xu
APPLIED PHYSICS LETTERS
(2007)
