Article
Chemistry, Physical
Robert M. Jacobberger, Donald E. Savage, Xiaoqi Zheng, Pornsatit Sookchoo, Richard Rojas Delgado, Max G. Lagally, Michael S. Arnold
Summary: This study investigates the effects of Ge surface orientation on graphene island formation, strain in large-area graphene films, and nanofaceting of Ge below graphene. The results show that the growth morphology and properties of graphene vary on different Ge surface orientations, but graphene exhibits a certain degree of strain regardless of the orientation.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Gaihua He, Ye Liao
Summary: Efficient non-noble metal bifunctional electrocatalysts for overall water splitting in pH universal electrolytes have been developed using MnO2/graphene composition. The coupling effect between MnO2 and graphene allows for better absorption of H2O, H+, and OH-. The presence of defects and stable Mn3+ facilitates electron and charge transfer, leading to low overpotentials and small Tafel slopes, indicating attractive activities for HER and OER. The synergistic effect and abundant heterogeneous interfaces in MnO2/graphene contribute to the excellent electrocatalytic performance, offering rich electroactive sites and accelerating electron transfer. This study provides a facile route for the development of nonprecious electrocatalysts for water splitting.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Chemistry, Multidisciplinary
Runyu Chen, Linxing Meng, Weiwei Xu, Liang Li
Summary: Sluggish oxygen evolution reactions on photoanode surfaces significantly limit the utilization of photoelectrochemical (PEC) water splitting. Loading cocatalysts onto photoanodes has been recognized as the simplest and most efficient optimization strategy, which can decrease the surface barrier, provide more active sites, and enhance the surface catalytic reaction kinetics. However, the introduction of cocatalysts inevitably creates interfaces between photoanodes and oxygen evolution cocatalysts (Ph/OEC), resulting in severe interfacial recombination and hindered charge transfer.
Review
Chemistry, Multidisciplinary
Ricardo Garcia
Summary: The properties of graphite, few layer, and 2D materials have led to various applications in biosensing, energy storage, and water desalination. This review discusses the recent experimental and theoretical advancements in understanding the structure of water on these materials' surfaces, revealing different layer structures under different conditions and the absence of water molecules near aged material surfaces.
Article
Chemistry, Analytical
Tao Zhou, Yang Qi Huang, Asad Ali, Pei Kang Shen
Summary: Anchoring nano heterojunction particles on the surface of porous Stereotaxically-constructed graphene provides a new direction for improving the catalytic performance of powder's electrocatalysis.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yung-Chang Lin, Amane Motoyama, Silvan Kretschmer, Sadegh Ghaderzadeh, Mahdi Ghorbani-Asl, Yuji Araki, Arkady Krasheninnikov, Hiroki Ago, Kazu Suenaga
Summary: 2D metal chloride structures are grown between bilayer graphene sheets through intercalation of metal and chlorine atoms, leading to the discovery of novel spatially confined phases of AlCl3 and CuCl2 distinct from their typical bulk forms. In situ scanning transmission electron microscopy (STEM) observations directly show transformations between these new phases, while density functional theory calculations provide insights into their electronic properties. Co-intercalation of different metal chlorides results in the creation of completely new hybrid systems, including in-plane quasi-1D AlCl3/CuCl2 heterostructures, hinting at the unique possibilities for fabricating new types of 2D materials with diverse electronic properties confined between graphene sheets.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Applied
Hua Zhang, Hongyi Li, Yintang Zhou, Fang Tan, Ruijie Dai, Xijun Liu, Guangzhi Hu, Laiming Jiang, Anran Chen, Renbing Wu
Summary: We have developed Fe2P-Co2P heterostructure nanowire arrays with lattice torsions and grain boundaries, which exhibit exceptional bifunctional catalytic activity for highly efficient water splitting. The lattice torsion interface not only exposes more active sites but also tunes adsorption energy through charge redistribution, resulting in overpotentials of 65 and 198 mV at 10 mA cm-2 for hydrogen and oxygen evolution reactions, respectively. In addition, the Fe2P-Co2P/NF-assembled electrolyzer achieves 10 mA cm-2 at an ultralow voltage of 1.51 V and a high solar-to-hydrogen conversion efficiency of 19.8% in solar-driven water electrolysis.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Wenkai Jiang, Xinwei Chen, Tao Wang, Bolong Li, Min Zeng, Jianhua Yang, Nantao Hu, Yanjie Su, Zhihua Zhou, Zhi Yang
Summary: A novel hybrid material composed of graphene quantum dots (GQDs) and metal phthalocyanine (MPc) derivatives has been obtained, leading to significantly enhanced response to NO2 and improved conductivity, response speed, reproducibility, selectivity, stability, and a minimum response concentration of 50 ppb. Ultra-low-power laser irradiation was used to solve the problem of slow recovery of metal phthalocyanine.
Article
Chemistry, Physical
Kelly T. C. Thomaz, Karen C. Bedin, Ingrid Rodriguez-Gutierrez, Nathalia C. Verissimo, Jefferson Bettini, Flavio L. Souza
Summary: Efficient and scalable designs of photoelectrochemical water splitting electrodes are a challenge. This study focuses on hafnium-modified hematite photoanodes, which show improved efficiency and performance compared to pure hematite. The research demonstrates the role of hafnium in reducing grain size and improving charge separation, leading to enhanced water splitting efficiency. This approach holds promise for the development of innovative photoelectrochemical water splitting technologies.
MATERIALS TODAY ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Wenbo Zhai, Biao Yuan, Yaqi Fan, Yue Zhang, Xiuli Zhang, Yanhang Ma, Wei Liu, Yi Yu
Summary: The uncontrolled deposition/dissolution process of lithium dendrites during electrochemical cycling in batteries limits the large-scale application of Li metal anodes. Investigating the microstructure of Li dendrites is a focal point. In this work, the room-temperature microstructure of Li dendrites was obtained by TEM using both vacuum- and inert-gas-transfer methods. Detailed comparison between LT- and room-temperature (RT)-TEM characterizations was provided to show the pros and cons of each method. By using RT-TEM, microstructural evolution of Li dendrites during the electrodeposition/dissolution process, including increase of the quantity of inorganic Li2O compounds in the solid electrolyte interphase, lateral growth behavior, and two types of inactive Li, has been revealed, enriching the understanding of the structure-property relationship of Li dendrites.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Wentao Bao, Jinfeng Yang, Wenxia Yan, Ying Tang, Zhen Yang, Yunxia Zhao, Gang Wang, Shengchao Yang, Feng Yu
Summary: Methods for designing and synthesizing energy-efficient, time-saving, and economical electrocatalysts are important to advance the electrolysis of water for hydrogen production. We present a simple method for in situ synthesis of hydroxyl oxide nanosheet materials supported on nickel foam as the conductive support that is quick, and operated at room temperature and pressure. This green and pollution-free preparation method forms an oxyhydroxide layer with more active sites on the nickel foam surface, while the self-supported nanosheet arrays ensure fast electron transfer and good sta-bility.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Xiaomeng Guo, Xiaoguang Duan, Junyi Ji, Xiaobin Fan, Yang Li, Fengbao Zhang, Guoliang Zhang, Yi-An Zhu, Wenchao Peng, Shaobin Wang
Summary: In this study, a nitrogen and sulfur co-doped graphene (SNG) anchored on interconnected conductive graphite foam (GF) was successfully fabricated, which can be directly used as a free-standing electrode for electrocatalytic degradation of organic pollutants and overall water splitting. The composite material exhibited enhanced electrochemical activation of peroxymonosulfate (PMS) for catalytic oxidation, and also showed superior performance in the oxygen evolution reaction (OER) compared to most reported metal-free catalysts.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yibing Liu, Bowen Zhou, Yubing Zhang, Weiping Xiao, Bin Li, Zexing Wu, Lei Wang
Summary: Transition metal nitride (TMNs) electrocatalysts have attracted great attention due to their unique electron structure, high activity, and excellent stability. In this study, a two-dimensional graphene-like structured nickel-molybdenum nitride (Ni-MoN) was prepared and showed good hydrogen and oxygen evolution reaction performances in alkaline media. The synthesized Ni-MoN exhibited high current densities and long-term stability under large-current density conditions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Jinlin Yang, Jibiao Li, Wenbin Gong, Fengxia Geng
Summary: Rechargeable magnesium batteries can potentially overcome safety, cost, and energy density limitations of lithium-ion technology. A proton-assisted method enables Mg2* intercalation into oxide host lattice while anisotropic Smoluchowski effect in titanium oxide lattices results in fast Mg2* diffusion kinetics with high ion conductivity, enabling high-power Mg-intercalation batteries with inorganic oxides.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Yuji Araki, Pablo Solis-Fernandez, Yung-Chang Lin, Amane Motoyama, Kenji Kawahara, Mina Maruyama, Yanlin Gao, Rika Matsumoto, Kazu Suenaga, Susumu Okada, Hiroki Ago
Summary: This study investigates the twist angle dependence of intercalation of metal chlorides in bilayer graphene (BLG). It is found that high twist angle BLG is more favorable for intercalation due to weaker interlayer coupling. Scanning transmission electron microscope observations reveal the formation of various 2D structures through co-intercalation of AlCl3 and CuCl2 molecules. Moreover, high twist angle BLG exhibits lower sheet resistance before intercalation and intercalation further decreases the sheet resistance.
Article
Multidisciplinary Sciences
G. Benedek, M. Bernasconi, D. Campi, I. V. Silkin, I. P. Chernov, V. M. Silkin, E. V. Chulkov, P. M. Echenique, J. P. Toennies, G. Anemone, A. Al Taleb, R. Miranda, D. Farias
Summary: Evidence of Spin Acoustic Surface Plasmons (SASP) in Ni(111) is provided in this study, showing that these plasmons originate from the majority-spin Shockley surface state and represent a new kind of collective quasiparticle. The interaction of SASP with phonons and acoustic surface plasmons leads to a substantial reduction in SASP velocity and avoided crossings with optical surface phonon branches.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Kyung Hwan Choi, Seungbae Oh, Sudong Chae, Byung Joo Jeong, Bum Jun Kim, Jiho Jeon, Sang Hoon Lee, Sang Ok Yoon, Chaeheon Woo, Xue Dong, Asghar Ghulam, Changmo Lim, Zhixiang Liu, Cong Wang, Ali Junaid, Jae-Hyun Lee, Hak Ki Yu, Jae-Young Choi
Summary: A new type of 1D inorganic material MoI3 was synthesized through a vapor transport reaction between molybdenum and iodine. The material exhibited semiconductor characteristics and could be separated to a few nanometer scale through mechanical and chemical exfoliation methods for use as a photodetector in the near IR-to-visible light region.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Kyung Hwan Choi, Seungbae Oh, Sudong Chae, Byung Joo Jeong, Bum Jun Kim, Jiho Jeon, Sang Hoon Lee, Sang Ok Yoon, Chaeheon Woo, Xue Dong, Asghar Ghulam, Changmo Lim, Zhixiang Liu, Cong Wang, Ali Junaid, Jae-Hyun Lee, Hak Ki Yu, Jae-Young Choi
Summary: A new 2D transition metal thiophosphate material, Nb4P2S21, was synthesized using a vapor transport reaction. The material was successfully exfoliated to nanometer scale and exhibited semiconducting characteristics, making it a potential candidate for multi-functional sensor devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Youngho Kim, Hyeon Ho Cho, Ji Kwon Bae, Jaeyeong Lee, Sang Hoon Lee, Xue Dong, Ghulam Asghar, Jae-Young Choi, Hak Ki Yu
Summary: Many attempts have been made to develop applications utilizing the metal-insulator transition (MIT) phenomenon of VO2, but the density difference between the two phases can be a serious obstacle. During the phase transition, a lamella structure is formed, leading to residual strain at the interface of each phase. The change in mechanical properties of VO2 during phase transition was also simulated using the finite element method.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Byung Joo Jeong, Kyung Hwan Choi, Jiho Jeon, Sang Ok Yoon, You Kyoung Chung, Dongchul Sung, Sudong Chae, Bum Jun Kim, Seungbae Oh, Sang Hoon Lee, Chaeheon Woo, Tae Yeong Kim, Jungyoon Ahn, Jae-Hyun Lee, Joonsuk Huh, Hak Ki Yu, Jae-Young Choi
Summary: This work successfully synthesized high-quality 1D van der Waals (vdW) Nb2Pd3Se8, demonstrating excellent transport characteristics of field effect transistors (FETs) at different temperatures.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Applied
Seungbae Oh, Jiho Jeon, Kyung Hwan Choi, Sudong Chae, Jae-Hyuk Park, Jae-Hyun Lee, Hak Ki Yu, Jae-Young Choi
Summary: The alloy phases of one-dimensional binary and ternary materials based on van der Waals bonding were synthesized and basic analysis of phase stability and lattice structure was performed. Lattice engineering was possible by changing the interplanar distance according to the transition metal mixing ratio. Elemental analysis of the synthesized material confirmed its composition is close to the actual mixing ratio used for synthesis. This study lays the foundation for evaluating the basic physical properties of the alloys and applying them to various devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Song Hee Lee, Noeul Kim, Ji Hwan Jeong, Bo-Hye Kim, Hak Ki Yu, Myung Hwa Kim
Summary: The direct phase transformation of ReO3 nanorods into 2D nanosheets of ReS2 on carbon fibres (CNFs) using a reducing heat treatment and induction of a sulfurization reaction is reported. The gas sensing abilities for NO2 and H-2 were also explored by investigating the change of electrical characteristics of both 2D ReS2 nanosheets and ReO3 nanorods on CNFs.
Review
Chemistry, Physical
Gianluca D'Olimpio, Daniel Farias, Chia-Nung Kuo, Luca Ottaviano, Chin Shan Lue, Danil W. Boukhvalov, Antonio Politano
Summary: Tin diselenide (SnSe2) is a versatile layered semiconductor with broad application capabilities in the fields of energy storage, photocatalysis, and photodetection. The formation of a SnO2/SnSe2 heterostructure allows for effective adsorption and sensing of noxious gases, as well as fast large-area imaging for millimeter waves.
Article
Chemistry, Multidisciplinary
Gianluca D'Olimpio, Lixue Zhang, Chia-Nung Kuo, Daniel Farias, Luca Ottaviano, Chin Shan Lue, Jun Fujii, Ivana Vobornik, Amit Agarwal, Piero Torelli, Danil W. Boukhvalov, Antonio Politano
Summary: Mitrofanovite, as an exceptional electrocatalyst, shows great potential in the hydrogen evolution reaction. It not only has spin-polarized topological surface states for spintronics applications, but also reduces electrode costs by 47% compared to pure platinum.
Article
Chemistry, Multidisciplinary
Seungbae Oh, Sudong Chae, Minho Kwon, Jungyoon Ahn, Chaeheon Woo, Kyung Hwan Choi, Jiho Jeon, Xue Dong, Tae Yeong Kim, Ghulam Asghar, Hanyoung Kim, Hyun-jong Paik, Hak Ki Yu, Jae-Young Choi
Summary: This study discovered a single-chain atomic crystal Mo3Se3-, which could be uniformly dispersed in an organic solvent and showed enhanced stability and mechanical properties through surface modification, indicating its potential applications.
Article
Chemistry, Physical
Daba Deme Megersa, Youngho Kim, Noeul Kim, Jaeyeong Lee, Jong Seong Bae, Jae-Young Choi, Hak Ki Yu
Summary: This study proposes a thermal release tape-supported Ru on graphene film (Ru/G/TRT) as a catalyst for the dehydrogenation of sodium borohydride (NaBH4). A Ru film deposited on sapphire was used to synthesize graphene, and the successful synthesis of graphene was confirmed by Raman spectroscopy and scanning electron microscopy. The catalytic performance of the Ru/G/TRT structure was found to be significantly improved compared to the etched Ru/G structure, with stability maintained after repeated use.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Jiho Jeon, Chaeheon Woo, Kyung Hwan Choi, Byung Joo Jeong, Sudong Chae, Seoungbae Oh, Sang Ok Yoon, Jungyoon Ahn, Tae Yeong Kim, Sang Hoon Lee, Xue Dong, Junaid Ali, Ghulam Asghar, Xiaojie Zhang, Jinsu Kang, Jae-Hyuk Park, Hak Ki Yu, Jae-Young Choi
Summary: This study discovered the polymorphism of Ta2Ni3Se8, a three-component one-dimensional chalcogenide material, and confirmed that the newly identified tetragonal phase (T-Ta2Ni3Se8) had a different crystal structure from the previously reported orthorhombic phase (O-Ta2Ni3Se8) through X-ray diffraction and transmission electron microscopy analyses. T-Ta2Ni3Se8 exhibited metallic characteristics, while O-Ta2Ni3Se8 was a semiconductor material. The change in electrical properties due to the variation in lattice isotropy according to the transformation of the crystal system is expected to be an important starting point for polymorphism studies of multi-component low-dimensional materials in the future.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xue Dong, Bom Lee, Asghar Ghulam, Jun Akedo, Hak Ki Yu, Jae-Young Choi, Jae-Hyuk Park
Summary: A PZT/Au composite film was prepared using aerosol deposition (AD) to modulate the dielectric properties of PZT. The dispersion of Au nanoparticles in the film significantly affected the dielectric constant and loss, with an increase of more than three times and low loss, respectively, when the wt % of Au nanoparticles increased. AD is expected to be a widely used method for the future development of dielectric complexes due to its simplicity and effectiveness in fabricating thin composite films.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Federico Mazzola, Barun Ghosh, Jun Fujii, Gokul Acharya, Debashis Mondal, Giorgio Rossi, Arun Bansil, Daniel Farias, Jin Hu, Amit Agarwal, Antonio Politano, Ivana Vobornik
Summary: We report the experimental signature of topological Dirac antiferromagnetism in TaCoTe2, demonstrating the existence of spin-orbit coupling-induced gaps at the Fermi level and a large intrinsic nonlinear Hall conductivity. The orientation of the Neel vector in TaCoTe2 shows remarkable sensitivity, suggesting its potential for non-volatile spintronic devices with unprecedented levels of intrinsic tunability.
Article
Chemistry, Physical
Gloria Anemone, Amjad Al Taleb, Antonio Politano, Chia-Nung Kuo, Chin Shan Lue, Rodolfo Miranda, Daniel Farias
Summary: Understanding the thermal expansion coefficient is crucial for preventing poor device performance, especially in the case of 2D heterostructures made of multiple layers of different materials. Helium atom scattering is an effective method for directly measuring the surface thermal expansion coefficient of materials, providing important information for determining the surface lattice constant at different temperatures.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)