Article
Chemistry, Physical
Meng Tang, Bo Wang, Huan Lou, Fei Li, Aitor Bergara, Guochun Yang
Summary: Through first-principles structure search calculations, a previously unknown semiconducting C3S monolayer has been identified, showing high electron mobility, optical absorption coefficients, and a moderate ability to split water, making it a promising candidate for novel optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Daijie Deng, Honghui Zhang, Jianchun Wu, Linhua Zhu, Min Ling, Sihua Dong, Huaming Li, Henan Li, Li Xu
Summary: This study utilized Co nanoparticles to construct a heterojunction with VN for oxygen reduction reaction (ORR). The Co/VN heterojunction increased active sites and improved the oxygen dissociation ability of VN species. Co nanoparticles transferred electrons to regulate the electronic structure of VN and facilitated the breaking of the O-O bond on the CoVN/NC surface. The resulting zinc-air battery exhibited high power density and cycle stability.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Physical
Duo Chen, Mengjie Lu, Boran Wang, Ruiqing Chai, La Li, Dong Cai, Hang Yang, Bingke Liu, Yupu Zhang, Wei Han
Summary: This study demonstrates for the first time a new energy storage mechanism involving cationic conversion reactions in the vanadium oxide-based ZIB system. Experimental and theoretical calculations confirm the reversible characteristics of these reactions, opening up a new direction for high-capacity ZIBs.
ENERGY STORAGE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Chunlin Teng, Chuanqi Zhang, Keshu Yin, Mengxiao Zhao, Yeshuang Du, Qi Wu, Xihong Lu
Summary: N-Fe2O3-x is a promising new cathode material for RAZBs with high capacity and excellent energy density, prepared through a unique method to achieve outstanding electrochemical performance.
SCIENCE CHINA-MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xuanxuan Cai, Yu Zhang, Huanhuan Cheng, Chenfan Liu, Zhiwen Wang, Hang Ye, Yanliang Pan, Dianzeng Jia, He Lin
Summary: This study introduces a novel approach that combines oxygen defect engineering and polymer intercalation to overcome the slow diffusion dynamics issue in aqueous zinc-ion batteries (AZIBs). Theoretical calculations demonstrate that polypyrrole (PPy) shielding effect and the cooperative influence of oxygen defects optimize the kinetic transport of Zn2+. Experimental findings confirm the theoretical predictions, showing that the NVO-O-d@PPy//Zn system exhibits exceptional cycling stability.
Article
Engineering, Electrical & Electronic
Kaiwen Li, Atsushi Shimizu, Xinyi He, Keisuke Ide, Kota Hanzawa, Kosuke Matsuzaki, Takayoshi Katase, Hidenori Hiramatsu, Hideo Hosono, Qun Zhang, Toshio Kamiya
Summary: In this study, the intrinsic physical properties of polycrystalline Zn3N2 thin films were investigated by suppressing donor impurities. It was found that grain boundary scattering significantly affected the mobility in this nondegenerate Zn3N2 thin film. The mobility of this film, reaching 340 cm(2) V-1 s(-1), was comparable to epitaxial thin films, indicating its potential as a transistor active layer material.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Monireh Faraji, Shahram Moradi Dehaghi
Summary: The Pd-g-C3N4/NCQD composite catalyst showed superior catalytic activity, methanol resistance, and long-lasting function compared to commercial Pt/C, making it a promising catalyst material for ORR in direct methanol fuel cells.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Guiying Feng, Hui Huang, Min Zhang, Zhuole Wu, Dandan Sun, Qiqing Chen, Dayan Yang, Yuanyi Zheng, Yu Chen, Xiangxiang Jing
Summary: Sonodynamic therapy (SDT) is a non-invasive therapeutic modality that uses reactive oxygen species (ROS) to treat tumors. However, the lack of high-performance sonosensitizers has limited the clinical translation of SDT. In this study, single atom iron (Fe)-doped graphitic-phase carbon nitride (C3N4) nanosheets were designed as chemoreactive sonosensitizers to generate ROS for melanoma treatment. The Fe doping not only improves the efficiency of ROS generation, but also acts as a peroxidase mimetic enzyme to catalyze the Fenton reaction for generating hydroxyl radicals, enhancing the therapeutic effect of SDT. This work demonstrates a unique single atom doping strategy for improving sonosensitizers and expands the application of semiconductor-based inorganic sonosensitizers in cancer therapy.
Article
Chemistry, Multidisciplinary
Alina Brzeczek-Szafran, Magdalena Gwozdz, Anna Kolanowska, Maciej Krzywiecki, Piotr Latos, Anna Chrobok
Summary: This study is the first to explore the application of N-doped carbon as a catalyst in a continuous-flow process, demonstrating its potential in sustainable and scalable processes. Compared to traditional batch systems, the flow approach shows higher conversions and wider application prospects.
REACTION CHEMISTRY & ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Ruyi Zhang, Xinyan Li, Jiachang Bi, Shunda Zhang, Shaoqin Peng, Yang Song, Qinghua Zhang, Lin Gu, Junxi Duan, Yanwei Cao
Summary: High-mobility epitaxial La-doped BaSnO3 films were successfully synthesized on SrTiO3 single crystal substrates using high-pressure magnetron sputtering, achieving a room-temperature electron mobility value that is among the highest reported values. The high argon pressure during sputtering is crucial in stabilizing the fully relaxed films and inducing oxygen vacancies, leading to high mobility at room temperature. This work provides an easy and economical method for mass producing high-mobility transparent conducting films for transparent electronics.
Article
Materials Science, Ceramics
Damian C. Onwudiwe, Violet M. Nkwe, Olalekan C. Olatunde, Hela Ferjani
Summary: The combination of carbon-based materials with semiconductor nanoparticles of different structures promotes unique properties. The photocatalytic activity of g-C3N4/Cu-Bi2S3 heterostructure was investigated in this study, showing about 95% degradation efficiency for methyl orange.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Applied
Shengming Chang, Hui Zhang, Zhongyi Zhang
Summary: The FeCo/NSC composite, prepared via one-step carbonization, exhibits excellent ORR and OER catalytic performance for zinc-air batteries, promising a potential strategy for bifunctional electrocatalyst development.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Physical
Bailing Dong, Yidan Fu, Lina Han, Pengfei Zheng, Xiaoyuan Zeng, Jie Xiao, Peng Dong, Yingjie Zhang
Summary: Recently, transition metal nitrides (TMNs) have received attention as electrode materials due to their high conductivity, large surface area, electronic structure, and mechanical properties. However, their poor activity in the oxygen reduction reaction (ORR) limits their use in zinc-air batteries. This study introduces Cr ions into the lattice of titanium nitride (TiN) to regulate its d-band center and optimize its structure and performance. The resulting Ti0.95Cr0.05N/NC/C shows improved catalytic activity, stability, and durability, making it a promising candidate for zinc-air batteries.
Article
Materials Science, Multidisciplinary
Xiao-Gang Wu, Rui Wang, Fei Ma, Xiao-Li Liu, Da-Li Jia, Hong-Cen Yang, Yan-Peng Liu, Zhi-Xia Wang, Han-Zhen Zheng, Ya-Nan Zhang, Juan Hou, Juan-Juan Huang, Shang-Long Peng
Summary: For zinc air batteries, a high-performance and stable non-noble metal-based electrocatalyst is crucial. This study presents a FeCo-N encapsuled in nitrogen-doped carbon nanotubes catalyst, which enables the design of controlled structures with excellent bifunctional electrocatalytic activities. By adjusting the molar ratio of metals, the synthesized FeCo-N-C catalyst exhibits competitive ORR and OER performance, with a low overvoltage gap of 0.8 V. It also shows promising stability and large power density as a cathode material in zinc air batteries.
Article
Multidisciplinary Sciences
Zhendong Liu, Junqiang Zhang, Xinze Li, Rui Cui, Jiliang Ma, Runcang Sun
Summary: Highly crystalline oxygen-doped carbon nitride nanotubes (O-CNNTs-x) were prepared using an ammoniumfluoride-assisted hydrothermal/calcination strategy, which exhibited excellent photocatalytic activity and the ability to modulate charge carrier motion. This study offers a facile approach for fabricating highly crystalline element-doped CN and demonstrates the viability of co-photocatalytic CO2 reduction and biomass selective oxidation.
Article
Energy & Fuels
Facun Jiao, Norikazu Kinoshita, Masato Kawaguchi, Motoyuki Asada, Maki Honda, Keisuke Sueki, Yoshihiko Ninomiya, Dmitry Sergeev, Marc Blaesing, Michael Mueller
Article
Energy & Fuels
Marc Blaesing, Maria Benito Abascal, Yoshihiko Ninorniya, Michael Mueller
Article
Chemistry, Physical
Yuta Inoue, Kiyoto Hara, Kenji Okudaira, Hibiki Ito, Yoshihiko Ninomiya, Tomoaki Namioka
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2018)
Article
Materials Science, Multidisciplinary
Naoomi Yamada, Yuumi Kondo, Ruichiro Ino
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
Peng Wu, Xiang Cao, Thomas Tiedje, Naoomi Yamada
Article
Physics, Applied
Fumio Kawamura, Naoomi Yamada, Xiang Cao, Motoharu Imai, Takashi Taniguchi
JAPANESE JOURNAL OF APPLIED PHYSICS
(2019)
Article
Materials Science, Multidisciplinary
Naoomi Yamada, Yuumi Kondo, Xiang Cao, Yoshitaka Nakano
APPLIED MATERIALS TODAY
(2019)
Article
Chemistry, Multidisciplinary
Naoomi Yamada, Yuta Tanida, Hidenobu Murata, Takahiro Kondo, Shougo Yoshida
ADVANCED FUNCTIONAL MATERIALS
(2020)
Article
Chemistry, Inorganic & Nuclear
Fumio Kawamura, Hidenobu Murata, Masataka Imura, Naoomi Yamada, Takashi Taniguchi
Summary: A novel ternary nitride semiconductor CaSnN2 with a rock-salt-type structure was synthesized, along with the systematic study of II-Sn-N-2 (II = Ca, Mg, Zn) semiconductors. Differences in structure and properties were revealed, showing CaSnN2 and MgSnN2 have band gaps suitable for various applications. These inexpensive and nontoxic semiconductors have potential as replacements for cadmium-based materials in pigments, as well as for InxGa1-xN semiconductors in emitting devices and photovoltaic absorbers.
INORGANIC CHEMISTRY
(2021)
Article
Physics, Applied
Shunichiro Yata, Mari Mizutani, Kaede Makiuchi, Fumio Kawamura, Masataka Imura, Hidenobu Murata, Junjun Jia, Naoomi Yamada
Summary: The charge-carrier transport properties of MgSnN2 films were studied, and it was found that the contribution of grain boundary scattering to electron transport was negligible for films with n(e) > 8 x 10^(20) cm^(-3), but became unignorable with decreasing n(e). The study also determined the conduction-band effective mass for the first time, showing that the conduction-band dispersion may be affected by the cation composition x.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Junjun Jia, Takashi Yagi, Mari Mizutani, Naoomi Yamada, Toshiki Makimoto
Summary: The ultrafast transient behavior of InN under intensive laser irradiation is investigated in this study. Using pump-probe techniques, simultaneous measurements of transient transmission and reflectivity reveal the complex transient behavior due to the change in dielectric constant induced by irradiation. The increase in both transient transmission and reflectivity at specific wavelengths is explained by the occupation probability of thermalized electrons and the collective motion of thermalized carriers. The electron-phonon scattering time in InN is estimated to be around 300fs based on the two-temperature model.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Kaede Makiuchi, Fumio Kawamura, Junjun Jia, Yelim Song, Shunichiro Yata, Hitoshi Tampo, Hidenobu Murata, Naoomi Yamada
Summary: Single-phase MgSnN2 thin films with rocksalt structure were successfully synthesized through high-pressure heat treatment and epitaxial growth. These films show potential as optoelectronic materials for light-emitting diodes and tandem solar cells.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Naoomi Yamada, Mari Mizutani, Kenta Matsuura, Masataka Imura, Hidenobu Murata, Junjun Jia, Fumio Kawamura
Summary: Wurtzite-type MgxZn1-xSnN2 alloys are proposed as promising earth-abundant and tunable band gap semiconductors with the potential to be grown on GaN substrates. These alloys show green-light emissions and can be tuned from 1.5 to 2.3 eV by increasing the composition parameter x. Direct-gap semiconductors with band gaps in the range of 1.8 to 2.5 eV are highly anticipated for the development of green LEDs and high-efficiency tandem solar cells.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Naoomi Yamada, Kenta Matsuura, Masataka Imura, Hidenobu Murata, Fumio Kawamura
Summary: The potential of wurtzite-type MgSnN2 as green emitters in LEDs and absorber material in photovoltaics has been studied, and the electron transport properties can be tailored by varying the cation composition. The Mg1+xSn1-xN2 films with Sn-rich composition exhibited a blue shift in their optical gap, while the intrinsic band gap of MgSnN2 was approximately 2.3 eV.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Takeo Ohsawa, Naoomi Yamada, Akichika Kumatani, Yoshitaka Takagi, Tohru Suzuki, Ryota Shimizu, Susumu Shiraki, Tsutomu Nojima, Taro Hitosugi
ACS APPLIED ELECTRONIC MATERIALS
(2020)