Article
Chemistry, Physical
Yifan Zhang, Yihan Wang, Yuan Gao, Xinwei Wang, Jianming Xue
Summary: This study doped Si atoms into single-layer graphene through ion implantation, with concentrations up to 8.9 at%, which can be accurately controlled by adjusting the ion fluence. Raman spectra revealed that the irradiation damage of graphene mainly consisted of substitutions and adsorptions, with vacancies maintained at a low level. The work function of the doped graphene increased from 4.34 to 4.46 eV with Si concentration varying from zero to 8.9 at%, showing potential in regulating the performance of related electrical applications.
APPLIED SURFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Meijia Qiu, Peng Sun, Kai Han, Zhenjiang Pang, Jun Du, Jinliang Li, Jian Chen, Zhong Lin Wang, Wenjie Mai
Summary: By analyzing experimental spectra and molecular simulation results, a direct link between tetrahedral entropy and the freezing behavior of water in Zn2+-based electrolytes is reported. Higher tetrahedral entropy leads to a lower freezing point, and the freezing temperature is directly related to the entropy value. Through tailoring the entropy of water, an ultralow temperature aqueous polyaniline|Zn battery is developed, exhibiting high capacity (74.17 mAh g(-1)) at -80 degrees C and excellent stability and frost resistance.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Alena Nikolskaya, Dmitry Korolev, Alexey Belov, Anton Konakov, Dmitry Pavlov, Alexey Mikhaylov, David Tetelbaum
Summary: The study compares the changes in photoluminescence under irradiation with As+ and Kr+ ions, showing that the intensity is higher and the maximum is shifted towards shorter wavelengths for As+ irradiation compared to Kr+ irradiation.
Article
Materials Science, Ceramics
Jean-Marc Costantini, Joel Ribis
Summary: This study investigates the damage induced in 3C-SiC epilayers on a silicon wafer by 2.3-MeV Si ion irradiation for different fluences, and deduces the threshold energy densities and irradiation doses for dislocation loop formation and amorphous phase transformation. The role of electronic excitations on the damage recovery at high fluence is also addressed for both SiC and Si.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Organic
Yu Fan, Jun Jing, Ruiqi Tong, Xiaoyu Tu, Lu Gao, Wanshu Wang, Zhenlei Song
Summary: An intramolecular ring expansion of in situ formed 3-silaazetidine with internal alkynes has been developed via Pd catalyzed Si-C bond activation. The reaction leads to the formation of 6,5-and 6,6-fused bicyclic 1,3-azasilines, with the silicon atom located at the ring junction position.
Article
Nanoscience & Nanotechnology
Hsien-Lien Huang, Christopher Chae, Jared M. Johnson, Alexander Senckowski, Shivam Sharma, Uttam Singisetti, Man Hoi Wong, Jinwoo Hwang
Summary: The atomic scale details of the formation of point defects and their evolution to phase transformation in silicon implanted beta-Ga2O3 were investigated using high resolution scanning transmission electron microscopy (STEM). The number and size of gamma-Ga2O3 regions increased as the Si dose increased, and eventually took over the entire implanted volume when the peak Si concentration reached a certain level. Annealing disintegrated the gamma-Ga2O3 phase and returned the structure to a defect-free, single crystal beta phase. However, when the structure was completely transformed to gamma-Ga2O3, post-annealing resulted in a high concentration of dislocations within the beta phase.
Review
Materials Science, Multidisciplinary
Shuai Wu, Fang Di, Jin-gang Zheng, Hong-wei Zhao, Han Zhang, Li-xiang Li, Xin Geng, Cheng-guo Sun, Hai-ming Yang, Wei-min Zhou, Dong-ying Ju, Bai-gang An
Summary: This paper provides an overview of the synthesis, characterization, and self-healing mechanisms of self-healing polymer binders for Si and Si/C anodes, as well as their recent application in flexible lithium batteries. The self-healing binder plays a crucial role in improving the cycling stability of Si-based anodes by repairing internal/external damages caused by volume changes. It has promising prospects in the development of advanced rechargeable lithium-ion batteries.
NEW CARBON MATERIALS
(2022)
Article
Electrochemistry
Jiawei Li, Yong Wang, Xin Xie, Zhao Kong, Yihong Tong, Hongyuan Xu, Hui Xu, Hong Jin
Summary: In this work, a novel three-dimensional binder (SPS) based on double dynamic chemical bonds is developed for silicon (Si) anodes. The SPS binder introduces abundant hydrogen bonds and dynamic borate ester bonds to construct a flexible and robust network, providing mechanical support and alleviating structural damage. Moreover, this unique binder promotes Li+ transportation efficiency and improves cycling stability.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Qiushi Wang, Tao Meng, Yuhang Li, Jindong Yang, Binbin Huang, Shanqiang Ou, Changgong Meng, Shanqing Zhang, Yexiang Tong
Summary: The study proposes a new method to stabilize silicon by successive chemical bond reconstruction, assembling silicon nanoparticles in a carbon-copper framework to provide short-range electron transfer and pulverization suppression, achieving high performance and stability in lithium-ion batteries.
ENERGY STORAGE MATERIALS
(2021)
Article
Chemistry, Organic
Kentaro Sakai, Kounosuke Oisaki, Motomu Kanai
Summary: Selective C(sp(3))-H functionalization using photoredox catalysis and hydrogen atom transfer catalysis has attracted increasing attention. We report the use of a Ph2GeCl2 cocatalyst that greatly improves the yield of alpha-C(sp(3))-H alkylation of primary amines catalyzed by a PC-HAT hybrid system. The alpha-position of the amino group selectively reacts, even when weaker C-H bonds exist in the substrates. This finding may aid in the design of novel site-selective hybrid catalysis.
Article
Energy & Fuels
Haoran Ye, Shenglei Huang, Cheng Qian, Zehua Sun, Yang Chen, Xinyao Song, Yutong Zhang, Na Wang, Yu Hu, Yanyun Yang, Lei Li, Zhu Ma, Tao Chen, Wenzhu Liu, Jian Yu
Summary: Photons of different wavelengths have significant effects on silicon heterojunction (SHJ) solar cells. Previous research has shown that long-wavelength photons can improve cell efficiency by activating boron doping. This study extends the investigation to explore the effects of short-wavelength photons on a-Si:H layers, SHJ solar cells, and modules. It is found that ultraviolet A (UVA) light with a wavelength of 365 nm can reduce hydrogen content and deteriorate interface passivation, leading to decreased efficiency and module power output. However, a light-soaking process or the use of UV band cutoff module encapsulants can mitigate the UV-induced degradation and ensure the long-term operation of SHJ solar cells and modules.
Article
Chemistry, Physical
Shiro Entani, Shin-ichiro Sato, Mitsunori Honda, Chihiro Suzuki, Tomitsugu Taguchi, Shunya Yamamoto, Takeshi Ohshima
Summary: Ni silicide synthesis by Ni ion beam irradiation into Si allows for the formation of local structures, with the mixed structure of metallic-like face-centered cubic Ni and NiSi2 phases observed. The formation of NiSi2 is significantly promoted with ion fluence above 10^15 ions/cm^2, and the amorphization of Si plays an important role in this process.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Paresh Kumar Majhi, Volker Huch, David Scheschkewitz
Summary: The synthesis and isolation of a stable potassium silagermenide compound with a Si=Ge bond as a suitable synthon for functional silagermenes has been reported. X-ray crystallographic analysis, UV/Vis spectroscopy, and DFT calculations confirmed a significant degree of pi-conjugation between N=C and Si=Ge double bonds in the compound.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Applied
Baohuan Wei, Monica Calatayud
Summary: In this study, the mechanisms of H-2 dissociation on different terminations of stoichiometric anatase TiO2 were investigated using density functional theory, with the (001) termination showing the lowest activation barrier for hydrogen dissociation and the (101) termination showing the highest.
Article
Chemistry, Multidisciplinary
Sheng Zhang, Yating Liang, Ke Liu, Xuan Zhan, Weigang Fan, Man-Bo Li, Michael Findlater
Summary: This study presents a strategy using hydrogen evolution reaction (HER) to generate carbanions from weakly acidic sp(3) C-H bonds. This approach allows for selective functionalization of C-H bonds without the use of strong bases or complicated procedures, enabling mild and efficient allylation and allenylation reactions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
