INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Qian Wen,Wencai Cheng,Meng Yan,Yi Liu,Zhentao Zhang,Yi Xie,Dadong Shao,Xirui Lu
Stabilizing radioactive iodine in boron glass for disposal was the ultimate goal of this study. In this study, bismuth was used near a monument. Thermogravimetric analysis showed that bismuth could remarkably stabilize iodine atoms in boron glass (only 3.74% of the mass was lost at 850 °C). Scanning electron microscopy–energy dispersive spectrometry images showed that most of the AgI was uniformly immobilized in the glass network. X-ray photoelectron spectrometry and NMR results confirmed the change in the coordination number of boron in the samples. The density functional theory calculation helped to understand the reason for the stable presence of iodine in boron glass. Iodine atoms were difficult to bond directly with boron atoms but tended to bond with bismuth atoms. From the spatial distribution of the structural molecular orbitals, it was observed that the bismuth atom releases electrons when stimulated, and the iodine atom needs to gain an electron to reach stability. At a low treatment temperature of 550 °C, the maximum density of the immobilized sample containing bismuth is 2.42 g·cm–3, and its iodine leaching rate at day 7 can be as low as 3.77 × 10–6 g·m–2·d–1. This study provides a way to improve the properties of boron glass microscopically in the future.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2021
·Vol. 14
·期 10
·2481
·
IF 3.623
Zhuo Zhao,Fang Fang,Junsheng Wu,Xinru Tong,Yanwen Zhou,Zhe Lv,Jian Wang,David Sawtell
Research on the preparation and performance of graphene composite materials has become a hotspot due to the excellent electrical and mechanical properties of graphene. Among such composite materials, zinc oxide/graphene (ZnO/graphene) composite films are an active research topic. Therefore, in this study, we used the vacuum thermal evaporation technique at different evaporation voltages to fabricate an amorphous ZnO/graphene composite film on a flexible polyethylene terephthalate (PET). The amorphous ZnO/graphene composite film inherited the great transparency of the graphene within the visible spectrum. Moreover, its electrical properties were better than those of pure ZnO but less than those of graphene, which is not consistent with the original theoretical research (wherein the performance of the composite films was better than that of ZnO film and slightly lower than that of graphene). For example, the bulk free charge carrier concentrations of the composite films (0.13, 1.36, and 0.47 × 1018cm−3corresponding to composite films with thicknesses of 40, 75, and 160 nm) were remarkably lower than that of the bare graphene (964 × 1018cm−3) and better than that of the ZnO (0.10 × 1018cm−3). The underlying mechanism for the abnormal electrical performance was further demonstrated by X-ray photoelectron spectroscopy (XPS) detection and first-principles calculations. The analysis found that chemical bonds were formed between the oxide (O) of amorphous ZnO and the carbon (C) of graphene and that the transfer of the π electrons was restricted by C=O and C-O-C bonds. Given the above, this study further clarifies the mechanism affecting the photoelectric properties of amorphous composite films.Keywords:amorphous;composite film;photoelectric properties;chemical bonds
研究领域:
材料科学
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物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Hongxiang Kuai,Chuang Ji,Xiangdong Ma,Xunhui Xiong,Shengkui Zhong
Black phosphorus (BP) anode has received extensive attentions for lithium-ion batteries (LIBs) due to its ultrahigh theoretical specific capacity (2596 mAh g −1 ) and superior electronic conductivity (≈10 2 S m −1 ). However, the enormous volume variations during lithiation/delitiation processes greatly limit its applications. Herein, a new BP-titanium disulfide-graphite (BP-TiS 2 -G) nanocomposite composed of BP, titanium disulfide and graphite has been prepared by a facile and scalable high-energy ball milling method. The experimental data proves that P C and P S bonds have been successfully introduced at the interface, which can effectively maintain the structural integrity of the BP-TiS 2 -G electrode when evaluated as an anode material for LIBs. In addition, lithium-ion diffusion kinetics have been demonstrated to be enhanced from the synergistic effect of P C and P S bonds. As a result, the BP-TiS 2 -G anode shows outstanding cycling stability (906.2 mAh g −1 after 1300 cycles at 1.0 A g −1 ) and superior rate performance (313.8 mAh g −1 at 10.0 A g −1 ). Our work shows the synergistic effects of different chemical bonds to stabilize BP can be a potential strategy for the development of high-performance alloy-type anodes for rechargeable batteries.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 14
·5195
·
IF 3.4
Jun Yang,Jinbiao Pang,Xiaofang Luo,Laiyuan Ao,Qiang Xie,Xing Wang,Hongyu Yang,Xianzhong Tang
This work studied the phase constitution, bond characteristics, and microwave dielectric performances of Sr2TiO4ceramics. Based on XRD and Rietveld refinement analysis, pure tetragonal Ruddlesden–Popper type Sr2TiO4ceramic is synthesized at 1425~1525 °C. Meanwhile, the microstructure is dense and without porosity, indicating its high sinterability and densification. Great microwave dielectric performances can be obtained, namely anεrvalue of 39.41, and aQ × fvalue of 93,120 GHz, when sintered at 1475 °C. Under ideal sintering conditions, the extrinsic factors are minimized and can be ignored. Thus, the intrinsic factors are considered crucial in determining microwave dielectric performances. Based on the P–V–L complex chemical bond theory calculation, the largest bond ionicity, and proportions to the bond susceptibility from Sr–O bonds suggest that Sr–O bonds mainly determine the dielectric polarizability. However, the Ti–O bonds show lattice energy about three times larger than Sr–O bonds, emphasizing that the structural stability of Sr2TiO4ceramics is dominated by Ti–O bonds, and the Ti–O bonds are vital in determining the intrinsic dielectric loss. The thermal expansion coefficient value of the Sr2TiO4structure is also mainly decided by Ti–O bonds.Keywords:Sr2TiO4;microwave dielectric properties;P–V–L complex chemical bond theory
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
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2021
·
IF 17.789
Qiushi Wang,Tao Meng,Yuhang Li,Jindong Yang,Binbin Huang,Shanqiang Ou,Changgong Meng,Shanqing Zhang,Yexiang Tong
The development of stable, high-energy electrode materials for lithium ion-batteries requires an elaborate effort to optimize the active materials as well as the chemical bonds and electron/ion transport in the electrode. However, hindered by the intrinsic structure and electrochemical degradation which is attributed to the volume expansion of materials, an increase in battery safety and reliability is concerned. Here, taking silicon as an example, we propose a strategy to stabilize this anode by successive chemical bonds reconstructing the surface. In this study, silicon nanoparticles are assembled in a carbon-copper framework via a facile and scalable pyrolysis process to provide a short-range electron transfer and pulverization suppression. Dissimilar to the current carbon coating methods, with the aid of Cu-O-C, Si-O-C, and Si-C chemical bonds, silicon hybridized reduced graphene oxide (rGO) and double-faced adhesive tape derived carbon composite (Si+rGO@DFAT-C) exhibits high structural integrity and immune to delamination. Hence, it demonstrates superior capacity (1536 mAh g −1 at 0.1 A g −1 ), high rate capability (1126 mAh g −1 at 2 A g −1 ), and stable electron stability (968.1 mAh g −1 after 200 cycles at 0.5 A g −1 ). This study emphasizes the crucial importance of well-tailor surface chemical bond reconstruction for the anode stabilization for high-performance LIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Dong Li,Kaixuan Wang,Ying Chen,Renyi Li,Jiahong Tang,Yizhou Zhao,Wei Guo,Qi Chen,Yujing Li
Graphical A 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is synthesized by immobilizing CsPbBr 3 (CPB) quantum dots on one-dimensional porous tubular g-C 3 N 4 (TCN). The strong Pb−N chemical bonding between CPB quantum dots and TCN provides a fast charge transfer channel for the CPB@TCN, which promotes the efficient separation and transfer of photogenerated carriers, resulting in excellent photocatalytic activity. Halide perovskite CsPbBr 3 (CPB) quantum dots (QDs) are considered as a promising candidate for solar-driven CO 2 conversion for their unique optoelectronic properties and suitable band structures. However, the CO 2 conversion efficiency of pristine CsPbBr 3 quantum dots is severely limited due to their rapid electron-hole pair recombination and insufficient active sites. In this study, by immobilizing CPB QDs onto one-dimensional (1D) porous tubular g-C 3 N 4 (TCN), an effective 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is fabricated. Density functional theory (DFT) calculations combined with experimental studies demonstrate that CPB QDs are uniformly anchored on the surface of TCN through Pb−N chemical bonding, resulting in efficient separation and transfer of photogenerated carriers in CPB@TCN photocatalysts. The resultant CPB@TCN photocatalysts exhibit significantly enhanced photocatalytic activity for CO 2 reduction with the highest conversion rate of 22.62 μmol g −1 h −1 , which is 5.33-times higher than that of pristine CPB QDs. This work unveils the interfacial bonding mechanism of CPB@TCN heterojunction through Pb−N chemical bond, which provides new insights for the development perovskite-based heterojunction photocatalysts.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2019
·
IF 3.771
Xiaolong Li,Shang Gong,Le Yang,Feng Zhang,Lijin Xie,Zhu Luo,Xiaosong Xia,Jun Wang
A kind of poly(lactic acid) (PLA) material with rapid degradation capacity was prepared with ferric chloride (FeCl 3 ), it's degradation rate was more than 10 times higher than that of pure PLA. FeCl 3 forms stable chemical bonds with C and O, which weakens the ester bond and leads to rapid degradation of PLA immensely. The degradation process of modified PLA is greatly accelerated because the presence of Fe 3+ facilitates the first step of the degradation process. The thermal stability of the modified materials decreased greatly, and the PLA changed from a higher crystalline polymer to an almost non-crystalline polymer with increasing FeCl 3 content, which enhanced the degradation rate due to the reduced intermolecular force . In terms of the degradation performance, the modified materials containing 2.95 phr FeCl 3 possessed the best comprehensive performance.
研究领域:
材料科学
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生物医学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2017
·
IF 5.951
Youping Zhou,Xijie Yin,Hubiao Yang,Jing Su,Huimin Yu,Yan Wang,Shuixiu Zhou,Saša Zavadlav
The chemical linkage between α-cellulose and lignin in plant cell walls has long been a controversial topic and crucial to devising effective strategies for sustainable biomass and bioenergy utilization. In this new contribution, we surveyed 80 Poaceae (Gramineae) species grown in tropical Hainan Island (China) to test the hypothesis that the presence of oxygen-containing chemical linkage in Poaceae species is widespread. Our innovative natural abundance oxygen isotopic analysis allowed us to infer that more than 1/3 of the species investigated has chemical (ether) linkages between α-cellulose and lignin in their leaf cell walls, with a species-specific 2–89 oxygen-containing bonds for every 1000 glucose units. However, the presence of such linkage appears to be phylogeny-dependent. On average, species of C3 photosynthetic mode are found to have more extensive oxygen-containing linkages than those of C4 photosynthetic mode. Our finding challenges the conventional view that no chemical bonds between α-cellulose and lignin are present in higher plant cell walls and calls for new strategies for further understanding of the chemical linkage between the two major constituents of cell walls. This is especially important in the context of renewed and growing interests in biomass, bioenergy, and plant cell wall structure studies.
研究领域:
植物学
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生物化学
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可再生资源研究
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Marwa Moatasim,Zixing Wang,Yanting Xie,Haichao Huang,Ningjun Chen,Yuchen Wang,Haibo Zhao,Haitao Zhang,Weiqing Yang
High electrical conductivity and all-open microstructure characteristics intrinsically endow both graphene and MXenes with superior electrochemical energy storage capability. However, the above two-dimensional (2D) thicker electrodes (>20 μm) severely dilute their unique rapid electronic–ionic transferring characteristic, posing a paradox of high gravimetric and high volumetric capacitive properties due to massively excessive macropores or an unduly restacked issue. Herein, we elaborately construct novel monolithic NH2-graphene and Ti3C2Tx MXene (NG@MX) composites through dual-functional induced self-assembly with the help of both covalent and hydrogen bonding interactions. Notably, much thicker monolithic NG@MX electrodes (>90 μm) fabricated by a conventional roll-coating method without any further compaction treatment can simultaneously deliver two times gravimetric (gra.) and volumetric (vol.) performance than those of pure graphene (in vol.) or MXene (in gra.) materials. Moreover, monolithic NG@MX-based supercapacitors can remarkably present two times energy density as that of graphene and four times as MXene, respectively. Such greatly enhanced electrochemical properties are closely related to the appropriate equilibrium of the volumetric density and the open structure, which can effectively guarantee the rapid transfer of both electrons and ions in the thick monolithic NG@MX electrodes. Undoubtedly, dual-functional chemical bonding-induced self-constructing NG@MX monoliths efficiently solve the long-existing gra. and vol. capacitive paradox of the thicker 2D materials used in supercapacitors, which will guide the design of high-performance capacitive materials and promote their practical application in electrochemical energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2018
·
IF 2.447
Shuyang Li,Xiaoyong Yang,Jian Liu,Xiaofeng Zhao,Shahid Hussain,Yi Ding,Yong Yi,Tao Duan
Using Ce atom as the surrogate for tetravalence actinides, the structure stability, chemical bonding and solubility of Zr 1- x Ce x SiO 4 have been investigated by combing first principles calculations and static leach test (MCC-1) experimentally to understand the effect of actinides on stability of ZrSiO 4 . The structural analysis indicates that the high symmetry of [CeO 8 ] polyhedron could well maintain the structural stability of Zr 1- x Ce x SiO 4 . However, due to the longer and weaker Ce O bond than Zr O bond, LR Ce is slightly higher than LR Zr . Besides, the LR Zr and LR Ce are highest in acid leaching solution , followed in alkaline leaching solution and deionized water system. Worth noted, the negative solution energy of −22.254 eV indicates the pre-existing Zr vacancy is energetically favorite to accommodate actinides surrogate Ce impurities or quadrivalent actinides with slight structural deformation, showing the strong structural and chemical stabilities of ZrSiO 4 .
研究领域:
材料科学
·
核化学与放射化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2018
·
IF 1.946
Linna Sha,Peng Gao,Xiaobo Li,Xuefeng Bai
In this work, amorphous CoB has been uniformly coated on C 60 surfaces through a simple ball milling process. Accordingly their XRD , SEM and TEM measurements clarify their related composite structures. Especially, a C-B chemical bond has been found through its XPS measurement, which enhanced the composite's stability and electrochemical activity. And the following electrochemical experimental results demonstrated that the as-obtained C 60 /CoB composite had considerably high storage capacities of 602 mA h/g, which were much higher than those of individual C 60 and CoB. Furthermore their hydrogen storage processes and the mechanism have also been investigated.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 6
·2995-3004
·
IF 10.733
Peng Wen,Kefei Zhao,Hui Li,Jiangsheng Li,Jing Li,Qing Ma,Scott M. Geyer,Lin Jiang,Yejun Qiu
Very recently, transition metal phosphides (TMPs) have emerged as low-cost and robust co-catalysts for decorating graphitic carbon nitride (g-C3N4) for photocatalytic hydrogen (H2) evolution. However, to date, little work has been done regarding the decoration approaches to hybridize TMPs on the g-C3N4 surface with homogeneous dispersion and intimate interfacial contact. Herein, we present a facile and convenient route to in situ incorporate g-C3N4 nanosheets (NSs) and Ni2P nanocrystal (NC) co-catalysts via a one-step co-heating solution approach. The Ni2P/g-C3N4 (in situ) hybrid photocatalyst achieved a far superior H2 production rate (2849.5 μmol g−1 h−1) and durability (no decrease after 4 cycles of reaction within 20 h) compared to the Ni2P/g-C3N4 (self-assembly) sample. The apparent quantum yield (AQY) of 18.8% at 420 nm was also much higher than that of other TMP co-catalyst loaded g-C3N4 hybrid photocatalysts. A possible Ni(δ+)–N(δ−) chemical coupling in the Ni2P/g-C3N4 (in situ) hybrid composite was proposed and corroborated by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy. The unique Ni(δ+)–N(δ−) chemical bonding states between g-C3N4 and Ni2P significantly accelerate the photo-generated charge-carrier separation and extraction from g-C3N4, as well as maintaining the H2 production durability. We believe that the hybridization route presented in this work will be extended to construct other TMP integrated photocatalysts toward efficient and stable solar water splitting.
研究领域:
材料科学
·
能源化学
·
表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）