Article
Engineering, Environmental
Kun Zhao, Wenshu Yang, Longhua Li, Shuaishuai Wang, Ling Wang, Zhihao Qi, Yonggang Yang, Zhu Chen, Jinwei Zhuang, Jinhui Hao, Weidong Shi
Summary: Heteroatom dopants can regulate the electronic structure on the surface of electrocatalysts and enhance the electrochemical activity for oxygen evolution reaction. Phosphorus-doped nickel oxyhydroxide shows improved electrochemical performance at low applied potential, enabling the formation of active sites through discharge processes, leading to faster mass transfer and increased current density.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Kai Chen, Jiaxin Wang, Jilong Kang, Xubin Lu, Xiaolin Zhao, Ke Chu
Summary: In this study, atomically Fe-doped and S-vacancy-rich MoS2 (Fe1/MoS2_x) is designed as a highly efficient electrocatalyst for NO-to-NH3 conversion. The Fe1/MoS2_x catalyst exhibits a maximum NH3-Faradaic efficiency of 82.5% and NH3 yield of 288.2 mu mol h_ 1 cm_ 2 at _ 0.6 V vs. RHE.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Jose Angel Pariente, Farzaneh Bayat, Alvaro Blanco, Antonio Garcia-Martin, Carlos Pecharroman, Manuel I. Marques, Cefe Lopez
Summary: By preparing colloidal crystals with random missing scatterers, crystals are created where disorder is embodied as vacancies in an otherwise perfect lattice. In this system, there is a critical defect concentration where light propagation undergoes a transition from a perfect reflector to an enhanced transmission phenomenon. This behavior can be phenomenologically described in terms of Fano-like resonances.
Article
Chemistry, Physical
Cheng-Fei Li, Jia-Wei Zhao, Ling-Jie Xie, Jin-Qi Wu, Gao-Ren Li
Summary: This study demonstrates the efficient design of bifunctional catalysts using doping and vacancy double control strategy for the significant enhancement of hydrogen and oxygen evolution reactions. The Fe-doped Ni5P4/Fe-doped Ni(OH)2 hybrid nanosheets with rich oxygen vacancies show excellent catalytic performances with low overpotentials and cell voltage for water splitting.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Chemical
Jiayu Li, Jun Xiong, Haoxue Huang, Mei Zhang, Wenshuai Zhu, Jun Di
Summary: The non-stoichiometric structure of tungsten oxide (W18O49) enables the formation of oxygen vacancies near low-valence W atoms, making it suitable for oxidative desulfurization. The desulfurization activity of W18O49 is enhanced by Mo doping and plasma-induced surface reconstruction, which adjust the atomic and electronic structure and increase the number of oxygen vacancies. The Mo-W18O49-P catalyst shows significantly improved oxidative desulfurization performance and can achieve deep desulfurization within 3 hours, with a better stability than pure W18O49.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Mingming Hou, Junnan Yang, Weiwei Feng, Huiru She, Changhui Xin, Qian Li, Xin Yu
Summary: Extending solar-light harvesting regions and improving charge separation are contributing to high-performance semiconductor photocatalysis. In this work, ultrathin carbon-coated Fe-TiO2-x nanostructures were prepared via one-pot calcination strategy for tetracycline degradation under visible-light irradiation. The carbon-coated Fe-TiO2-x composites displayed remarkably enhanced visible-light harvesting and showed the highest charge separation and lowest interfacial migration resistance in the carbon-coated Fe-TiO2-x-3% sample, leading to the best photo catalytic performance with a rate constant of 0.02512 min-1 towards tetracycline degradation, approximately 3.02 times that of commercial TiO2.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Xiaobin Liu, Qingping Yu, Xinyue Qu, Xinping Wang, Jingqi Chi, Lei Wang
Summary: This study proposes an approach to manipulate electron redistribution in Ni2P through cation doping and vacancy engineering, and successfully synthesizes needle-like Fe-doped Ni2P with P vacancy. The resulting Fe-Ni(2)Pv exhibits excellent catalytic activity for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) in seawater electrolysis under alkaline conditions.
ADVANCED MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Ying Li, Shengli Niu, Yanan Hao, Wenbo Zhou, Jun Wang, Jiangwei Liu
Summary: This work investigates the catalytic performance of mesoporous SrTi1-xFexO3 (x = 0.05, 0.10, 0.15 or 0.20) for biodiesel production from palm oil with a high acid value. The study reveals that Fe doping increases the electron density of active sites and promotes the polarization of the perovskite structure, thereby improving the catalytic activity. The SrTi0.85Fe0.15O3 catalyst exhibits the most oxygen vacancies and achieves the highest catalytic performance, while also demonstrating strong resistance to FFAs.
Article
Chemistry, Physical
Zhilin Li, Jin Kang, Yiwu Tang, Chongyue Jin, Haoyang Luo, Siyan Li, Jiayun Liu, Min Wang, Chunmei Lv
Summary: In this study, iron-doped Co3O4 mesoporous nanosheets were prepared to degrade P-nitrophenol using peroxymonosulfate activation. The optimal 0.15Fe/Co3O4 showed excellent PMS activation performance due to enhanced electron transfer efficiency and abundant oxygen vacancies. The relationship between PNP degradation efficiency and the contents of Co, Fe, and oxygen vacancies was observed, and a mechanism for the improved activation efficiency was proposed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jing-Yi Xie, Jie Zhao, Jun-Qi Han, Fu-Li Wang, Xue-Jun Zhai, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Fe-NiOOH-OV-600, a Fe-doped nickel oxide hydroxide with abundant oxygen vacancies supported on nickel foam (NF), was successfully constructed using a hydrothermal method and an electrochemical activation strategy. The catalyst exhibited large current densities and excellent stability in the oxygen evolution reaction (OER) in alkaline electrolyte. This work provides new insights into the design of efficient transition-metal-based electrocatalysts for the OER.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Energy & Fuels
Jinxiu Wang, Yuqiu Liu, Xianfang Yi, Yanting Chen, Yanke Yu, Jinsheng Chen
Summary: Researchers have developed a novel NH3-SCR catalyst to control NOx emissions from fossil fuel combustion. By doping CeO2 catalysts with Fe and conducting sulfation treatment on porous nanorods, the catalysts showed improved conversion of NOx. The introduction of Fe and sulfation treatment resulted in changes in morphology, surface area, and acidity of the catalysts, contributing to enhanced catalytic activity.
Article
Materials Science, Multidisciplinary
Manikandan Dhamodaran, Ramesh Karuppannan, Ramaswamy Murugan, Danil W. Boukhvalov, Muthu Senthil Pandian, Ramasamy Perumalsamy
Summary: In this study, Fe and Mn co-doped In2O3 single-phase cubic crystal structure nanocubes were prepared using hydrothermal-annealing technique. Experimental and theoretical investigations revealed that FeIn-nMni clusters play a crucial role in the observed ferromagnetism in the co-doped systems.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Lifeng Hao, Zewen Jiang, Yujie Fang, Yang Zhou, Bin Fu, Liyu Lin
Summary: This study investigated the effect of oxygen vacancy on the corrosion resistance of epoxy coatings containing cobalt-doped CeO2 nanoparticles. The presence of oxygen vacancy significantly improved the corrosion resistance by forming insoluble cerium hydroxide through oxygen reduction and acting as a charge capture center to block the generation of new substances from cathodic and anodic reactions. This work provides a novel understanding of cerium oxide nanoparticles as corrosion inhibitors and presents an effective strategy for achieving excellent corrosion resistance in a corrosive environment.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Bo Liu, Zhe Yan, Tong Xu, Chunping Li, Rui Gao, Haigang Hao, Jie Bai
Summary: A unique strategy of double-layered nanotube morphology and Fe doping engineering is used to create surface oxygen vacancies and interface heterojunctions on CeO2 simultaneously, greatly enhancing the photocatalytic activity and selectivity of the catalyst.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Fabiane J. Trindade, Sergio Damasceno, Larissa Otubo, Marissol R. Felez, Daniel Z. de Florio, Fabio C. Fonseca, Andre S. Ferlauto
Summary: The design and control of the size, shape, and surface chemistry of nanomaterials, particularly ceria nanoparticles, have a significant impact on their properties. This study demonstrates the fine-tuning of structural defects and morphology of La-doped ceria nanoparticles through varying La doping ratios and hydrothermal synthesis temperature. The results provide valuable insights for the development of high-temperature oxide catalysts and other applications.
ACS APPLIED NANO MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Wonhee Ko, Zheng Gai, Alexander A. Puretzky, Liangbo Liang, Tom Berlijn, Jordan A. Hachtel, Kai Xiao, Panchapakesan Ganesh, Mina Yoon, An-Ping Li
Summary: This article reviews the recent progress in understanding the role of heterogeneities in quantum materials and their effects on quantum behaviors. The authors assess three interconnected areas, including revealing the degrees of freedom of heterogeneities, understanding their impact on quantum states, and controlling heterogeneities for new quantum functions.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Zi-Jian Lang, Fan Yang, Wei Ku
Summary: Recent observations in cuprate high-temperature superconductors show that increasing carrier density leads to a decrease in superfluid phase stiffness, contrary to the quantum density-phase conjugation theory. Analytic estimation and Monte Carlo calculations were performed to study the underlying mechanisms, revealing that the special properties of the carriers can cause enhanced phase fluctuation with increasing density. This finding suggests a new paradigm for understanding unconventional superconductivity in strongly correlated materials based on bosonic superfluidity.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Mainak Pal, Andreas Kreisel, P. J. Hirschfeld
Summary: There are proposals for platforms supporting topological superconductivity in high-temperature superconductors in order to take advantage of the larger superconducting gap and the expected robustness of Majorana zero modes. The iron-based materials offer large Tc and nodeless energy gaps, along with atomically flat surfaces that allow for engineering defect structures and measuring spectroscopic properties to reveal topological aspects. By including the correlated nature of materials and the multiband electronic structure, the authors demonstrate how correlations can lead to local magnetic order and the emergence of a topological superconducting state.
Article
Materials Science, Multidisciplinary
Mainak Pal, Andreas Kreisel, W. A. Atkinson, P. J. Hirschfeld
Summary: Theoretical studies of disordered d-wave superconductors have mainly focused on optimally doped models with strong scatterers, but it is necessary to also study the weaker scattering associated with dopant atoms in order to address recent controversies about overdoped cuprates. In this study, simple models of such systems are investigated using the self-consistent Bogoliubov-de Gennes (BdG) framework and compared to disorder-averaged results using the self-consistent T-matrix-approximation (SCTMA). The SCTMA performs well overall, except for highly disordered systems with strongly suppressed superfluid density.
Article
Materials Science, Multidisciplinary
Philip M. Dee, Benjamin Cohen-Stead, Steven Johnston, P. J. Hirschfeld
Summary: In a recent study, Schrodi et al. discovered an unconventional superconducting state with a sign-changing order parameter using the Migdal-Eliashberg theory. They found this unconventional solution despite using an isotropic bare electron-phonon coupling in the Hamiltonian. However, our Monte Carlo simulations on a similar model suggest that unconventional pairing correlations do not exceed their noninteracting values at any carrier concentration we have checked. Instead, strong charge-density-wave correlations persist at the lowest accessible temperatures.
Article
Materials Science, Multidisciplinary
Merce Roig, Astrid T. Romer, P. J. Hirschfeld, Brian M. Andersen
Summary: The superconducting instabilities of the 2D extended repulsive one-band Hubbard model depend on electron density, band, and interaction parameters. The results show that different pairing symmetries dominate in the absence or presence of repulsive longer-range Coulomb interactions.
Article
Materials Science, Multidisciplinary
A. C. Hire, S. Sinha, J. Lim, J. S. Kim, P. M. Dee, L. Fanfarillo, J. J. Hamlin, R. G. Hennig, P. J. Hirschfeld, G. R. Stewart
Summary: Recently, it was discovered that MoB2 exhibits superconductivity at elevated pressures with a critical temperature as high as 32 K. This superconductivity is suggested to emerge from a pressure-induced structural transition to an MgB2-like structure. This finding implies that high Tc values are not limited to MgB2 and other diborides with a similar structure may also exhibit similarly high Tc values. In this paper, density functional theory calculations and experimental measurements confirm this hypothesis.
Article
Materials Science, Multidisciplinary
H. U. Ozdemir, Vivek Mishra, N. R. Lee-Hone, Xiangru Kong, T. Berlijn, D. M. Broun, P. J. Hirschfeld
Summary: Recent experimental papers suggest the breakdown of the quasiparticle-based Landau-BCS paradigm in the superconducting state due to unexpected behavior. However, the authors argue that a phenomenological dirty d-wave theoretical analysis can explain most aspects of the superconducting state by considering the unusual effects of weak, out-of-plane dopant impurities. In this study, ab initio calculations were performed to quantitatively analyze the theory by considering realistic band structures, Fermi liquid renormalizations, and vertex corrections.
Article
Physics, Multidisciplinary
Yuting Tan, Tianyu Zhang, Tao Zou, A. M. Dos Santos, Jin Hu, Dao-Xin Yao, Z. Q. Mao, Xianglin Ke, Wei Ku
Summary: A counterintuitive enhancement of quantum fluctuation with larger spins is discovered in studying the emergent magnetism in high-temperature superconductor FeSe under pressure. The larger spins in FeSe suffer even stronger long-range quantum fluctuations that diminish their ordering at ambient pressure, but the ordering can develop above 1 GPa due to weakened fluctuation.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Xiang Li, Thors Hans Hansson, Wei Ku
Summary: The Aharonov-Bohm effect is a quantum effect that causes a measurable phase shift in the wave function of a charged particle encircling an inaccessible magnetic flux. While classically believed to be impossible, quantum mechanics reveals a local coupling between the particle's current and the electromagnetic vector potential A, extending beyond the region of finite magnetic field. This suggests the fundamental nature of A over B in quantum mechanics, despite A being unobservable.
Article
Materials Science, Multidisciplinary
Merce Roig, Astrid T. Romer, Andreas Kreisel, P. J. Hirschfeld, Brian M. Andersen
Summary: Hund's pairing is generated by the attractive Hund's exchange J, even in the presence of repulsive onsite interactions in multi-orbital systems. However, spin-fluctuation pairing generally dominates over Hund's pairing in systems characterized by a peaked finite-momentum particle-hole susceptibility. Therefore, it appears unlikely that Hund's pairing states would be realized in systems like Sr2RuO4 and generic iron-based superconductors.
Article
Physics, Multidisciplinary
Astrid T. Romer, T. A. Maier, Andreas Kreisel, P. J. Hirschfeld, Brian M. Andersen
Summary: This article presents a systematic study of the pairing form of the unconventional superconductor Sr2RuO4, proposing a possible two-dimensional pairing form and validating it through calculations and experimental results.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
S. Thebaud, T. Berlijn, L. Lindsay
Summary: This paper explains the surprising success of lowest-order quantum perturbation theory in predicting thermal conductivities in semiconducting alloys by focusing on the case of maximally mass-disordered Mg2Si1-xSnx. The authors use a Chebyshev polynomials Green's function method to probe individual phonon linewidths and frequency-resolved thermal transport. They demonstrate that the success of perturbation theory originates from the specific form of mass disorder terms in the phonon Green's function and the interplay between anharmonic and disorder scattering.
Article
Materials Science, Multidisciplinary
Zi-Jian Lang, Ruoshi Jiang, Wei Ku
Summary: Researchers suggest that nickel chalcogenides may be a promising family of materials for improving superconducting properties, with low-energy physics closer to that of the cuprates and stronger magnetic interaction than the nickelates. This proposal also opens up the possibility of parameter tuning through ligand substitution among chalcogenides to further enhance superconducting properties.
Article
Physics, Multidisciplinary
Sai Mu, Kiranmayi D. Dixit, Xiaoping Wang, Douglas L. Abernathy, Huibo Cao, Stephen E. Nagler, Jiaqiang Yan, Paula Lampen-Kelley, David Mandrus, Carlos A. Polanco, Liangbo Liang, Gabor B. Halasz, Yongqiang Cheng, Arnab Banerjee, Tom Berlijn
Summary: This study investigates the phonon structure of alpha-RuCl3 and finds that certain phonons in the material have significantly reduced velocities, potentially dominating the observability of the half-integer plateaus in the thermal Hall conductance. The findings are crucial for understanding the controversy surrounding the observation of this phenomenon.
PHYSICAL REVIEW RESEARCH
(2022)
