JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 15
·7502-7506
·
IF 5.968
Hechun Jiang,Pengcheng Dai,Zhenyu Feng,Weiliu Fan,Jinhua Zhan
Cu2ZnSnS4 (CZTS) is acknowledged as an alternative to traditional p-type semiconductors. Traditionally obtained CZTS, however, is mostly kesterite or stannite phase, which features a tetragonal crystal cell. Herein, novel orthorhombic CZTS has been synthesized via an ethylenediamine-assisted hydrothermal method. Ethylenediamine plays an important part in the construction of the orthorhombic phase. Kesterite CZTS was also obtained in an ultrapure water system without ethylenediamine. The structure was confirmed by XRD, XPS and HRTEM. The band gap of the orthorhombic CZTS is about 1.45 eV, which approaches the optimum value for solar photoelectric conversion. What's more, we found that this orthorhombic CZTS is metastable. After annealing at 500 °C, a phase transformation from the orthorhombic structure to the tetragonal kesterite structure was achieved. The photoelectric response was also characterised, which demonstrated its potential for application in photovoltaic devices.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Wentao Li,Qian Zhang,Zuohua Liu,Changyuan Tao,Guocan Zheng,Dong Wang,Hufei Chen
Long-term accumulation of manganese sulfate residue can lead to the release of soluble manganese ions, which in turn can contaminate the surrounding environment. However, effectively guiding the treatment of soluble manganese in manganese sulfate residue is challenging due to limited understanding of its metastable structure. In this study, the metastable phase of manganese sulfate residue was analyzed by transmission electron microscope (TEM), cross-reaction X-ray energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD). The results reveal that the metastable phase within manganese sulfate residue consists of amorphous hydroxide and calcium sulfate. Furthermore, the amorphous hydroxide colloid is coated by calcium sulfate. The reconstruction of the metastable structural phase in manganese sulfate residue was achieved by adding BaCO 3 . The toxic leaching of the residue after phase reconstruction was assessed. The results show that the lowest leaching concentration of Mn and Ba were 0.6737 mg L −1 and 1.778 mg L −1 , respectively. The leaching amounts of Mn and Ba were within the allowable range of GB 8978–1996 and GB 5085.3–2007, respectively. This suggests that the addition of BaCO 3 can achieve harmless of manganese sulfate residue. Finally, the reconstructed residue is used to prepare the unfired brick with wave-absorbing. The obtained results show that the compressive strength of the brick is 17.00 MPa, meeting the standard of MU15. Additionally, the minimum reflection loss value of the brick is −10.51 dB, showing that the material has promising ability in absorbing wave.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2013
·
IF 10.677
Dongpeng Yang,Siyun Ye,Jianping Ge
Solvent wrapped “metastable” crystalline colloidal arrays (CCAs) have been prepared by supersaturation induced precipitation and self-assembly of monodisperse particles in polar/nonpolar organic solvents. These metastable CCAs possess ordered structures but with less stability comparing with traditionally fixed colloidal crystal systems. They are stabilized by the balance between long-range attraction and electrostatic repulsion of neighboring like-charged particles. Monitoring the reflection intensity during evaporation suggests that these crystals can exist for several hours at 90 °C and even longer at room temperature. Based on the evolution of particle volume fraction in whole suspension (ϕSiO2), crystal phase (ϕcrystal), and liquid phase (ϕliquid), the formation of metastable CCAs can be understood as a microscopic phase separation process, where the homogeneous dispersion will separate into a “crystal phase” with orderly stacked particles and a “liquid phase” with randomly dispersed particles. Further calculation of the volume fraction of crystal phase (Vcrystal/Vtotal) and the ratio of particles in crystal phase (fcrystal) shows that with the increase of designed ΦSiO2, more particles precipitate to form colloidal crystals with larger sizes but the lattice spacing of the microcrystals remains constant. Unlike fixed or traditional responsive CCAs, these metastable CCAs can reversibly assemble and disassemble with great ease, because little energy is involved or required in this transformation. Therefore, they can sense weak external disturbances, including subtle motion and slight friction or shearing forces.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 42
·2302692
·
IF 27.8
Qingyu Wang,Yida Zhang,Minxi Lin,Hengwei Wang,Yu Bai,Chengyuan Liu,Junling Lu,Qiquan Luo,Gongming Wang,Hai-Long Jiang,Tao Yao,Xusheng Zheng
Metastable structures are promising candidates for efficient catalysis owing to abundant active electronic states, strong electronic coupling with reactants, and energetic preference. Exerting the value of metastable structures while evading the difficulty in direct synthesis remains challenging. Herein, it is reported that light irradiation enables the generation and maintenance of the metastable state over copper single atoms for efficient carbon dioxide reduction. Under irradiation with light, photogenerated electrons transit to Cu-3 d orbits and initiate d -orbital rearrangement. The initial symmetric Cu 1 ─O 4 coordination converts to the metastable asymmetric structure of Cu 1 ─O 2+1 , and is reversibly restored after removing the light. The photoinduced metastable intermediate of Cu 1 ─O 2+1 promotes the Cu single-atom catalyst to deliver an ethylene yield rate of 60.4 µmol g cat. −1 h −1 . Mechanistic studies reveal that Cu 1 ─O 2+1 possesses stronger adsorption capability for reactants and intermediates. The reaction energy barrier over Cu 1 ─O 2+1 also shows an obvious decline compared to that over Cu 1 ─O 4 .
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Zhonghua Li,Songgu Wu,Junbo Gong
The influence of halogen-atom substitution for a dimethyl isophthalate compound on the polymorphic behavior and isostructurality property was explored in this paper. Sublimation was demonstrated to exhibit remarkable advantages. Specifically, two polymorphs (Form I and Form II) of dimethyl 5-bromoisophthalate and two polymorphs (Form A and Form B) of dimethyl 5-iodoisophthalate were discovered for the first time. Moreover, the corresponding single crystals suitable for crystal structure determination were also successfully harvested within a few hours. More interestingly, the crystal packing similarities between the stable Form II and metastable Form A were established with the evaluation of quantitative analysis tools. The success in achieving the regulation of luminescence emission with the changes of crystal packing patterns, molecular conformations, and interactions via halogen substitution will provide some inspiration for the development of novel flexible optical solid-state systems in the future.
研究领域:
材料科学
·
晶体学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Chen Fanpeng,Cheng Chuanqi,Wang Jiajun,Han Yanran,Zhao Bo-Hang,Zhang Bin
Metastable carbides and chalcogenides are attractive candidates for wide and promising applications. However, their inherent instability leads to synthetic difficulty and poor durability. Thus, the development of facile strategies for the controllable synthesis and stabilization of metastable carbides is still a great challenge. Here, taking metastable ɛ -Fe 2 C as a case study, potassium ions (K + ) are theoretically predicted and experimentally reported to control the synthesis of metastable ɛ -Fe 2 C from an Fe 2 N precursor by increasing the surface carbon chemical potential ( μ C ). The controllable synthesis and improved stability are attributed to the better-matched denitriding and carburizing rates and the impeded spillover of carbon atoms in metastable ɛ -Fe 2 C with high carbon contents due to the enhanced surface μ C . In addition, this strategy is suitable for synthesizing metastable γ ’-MoC, MoN, 1 T -MoS 2 , 1 T -MoSe 2 , 1 T -MoSe 2 x Te 2(1− x ) , and 1 T -Mo 1 − x W x Se 2 , highlighting the universality of the methodology. Impressively, gram-level scalable metastable ɛ -Fe 2 C remains stable for more than 398 days in air. Furthermore, ɛ -Fe 2 C exhibits remarkable olefin selectivity and durability for more than 36 h of continuous testing. This work not only demonstrates a facile, easily scalable, and general strategy for accessing various metastable carbides and chalcogenides but also addresses the synthetic difficulty and poor durability challenge of metastable materials.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 15
·4837-4850
·
IF 6.177
Haoyi Lin,Jiaxing Zhang,Qingxu Duan,Kaixuan Yang,Weiping Liao,Shixue Qi,Hongying Lü,Zhiguo Zhu
Plentiful heteroatom-containing zeolites as versatile redox catalysts have been successfully post-synthesized via the top-down methodology, where the starting aluminosilicate zeolites are normally expected to be highly dealuminated to maximize the amounts of silanol nests and occasionally to evade the detrimental effect of framework Al ions on the catalytic performance. Herein, our proposed dealumination-controlled strategy for the synthesis of hierarchical Ti–Y zeolite breaks through this concept. Framework-substituted Ti and tri-coordinated Al species were afforded from the interaction of Ti ions with dealumination-derived silanol nests and from the process of acid treatment, respectively. Structure–function relationships revealed that Lewis acid sites were the catalytically active centres of Ti–Y zeolite in oxidative desulfurization with hydrogen peroxide as the oxidant, which came from the cooperative effect of dual active sites containing framework-substituted Ti and tri-coordinated Al species. The amounts of Lewis acid sites demonstrated a volcanic-type trend as the acid-treatment time increases. The reusability, regeneration ability, deactivation mechanism were also systematically investigated in oxidative desulfurization. Thus the Ti–Y zeolite catalyst was also effective for Baeyer–Villiger oxidation of 2-adamantanone. This work discloses the effectiveness of preparing an efficient Ti–Y zeolite catalyst with cooperative dual active sites via a dealumination-controlled strategy, which bears potential application for constructing other heteroatom-containing FAU-type zeolites with Lewis acid property.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 25
·2300636
·
IF 19
Shize Geng,Yujin Ji,Shize Yang,Jiaqi Su,Zhiwei Hu,Ting-Shan Chan,Hao Yu,Youyong Li,Yi-Ying Chin,Xiaoqing Huang,Qi Shao
Direct synthesis of hydrogen peroxide (H 2 O 2 ) through electrochemical oxygen reduction has gained close attention yet remains a great challenge due to the slow kinetics. Herein, combining with the virtues of the native high energy state and fascinating surface environment of metastable materials and doping strategy, an efficient phosphorus-optimized metastable hexagonal-close-packed phase nickel catalyst (P-hcp Ni), belonging to the space group (P63/mmc, 194), with P doping is demonstrated. Significantly, it achieves high selectivity of 97% and a high intrinsic turnover frequency of 2.34 s −1 , much better than those of the stable face-centered-cubic Ni catalyst. It also displays high stability with remaining in the metastable phase after the stability test. More importantly, P-hcp Ni also achieves a productivity of 4917.2 mmol g Ni −1 h −1 and an accumulated concentration of (H 2 O 2 ) of 2.38 mol L −1 after 130 h stability test in pure water with a solid electrolyte. Further investigation reveals that the P doping not only greatly enhances the stability of metastable phase, but also weakens the *OOH adsorption on the active site, promoting the high production of H 2 O 2 in the neutral media.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Mei-Huan Zhao,Xiao Zhou,Yifeng Han,Dequan Jiang,Yonggang Wang,Kuo Li,Haiyan Zheng,Huiyang Gou,Ling Chen,Man-Rong Li
Intercepting metastable phases by chemical approaches is an important solution to explore structural varieties of functional materials under positive/negative pressure, as paradigmatically exemplified by the polymorph modification in Li2TiTeO6. Here, we stabilized a novel metastable Li2TiTeO6 (denoted as γ-phase) in the ordered-ilmenite-type R3 via facile topotactic reaction from Na2TiTeO6, which was found to crystallize in R3 instead of the reported R3̅ structure. The calculated equilibrium volume of γ-Li2TiTeO6 is larger than that of the ground-state Pnn2-Li2TiTeO6 (denoted as α-phase), indicating that γ-Li2TiTeO6 can only be stabilized under “negative pressure” quantified to be around −6 GPa. The γ-phase irreversibly transforms into the α-phase around 560 °C under ambient pressure, accompanied by a steep increase (∼500 times) of the second harmonic generation (SHG), indicating a potential application of γ-Li2TiTeO6 as an optical thermometer. These findings elegantly show that chemical pressure as well as physical pressure is powerful to tune the polymorphs for metastable phases and exotic properties as paradigmatically exemplified by Li2TiTeO6, which undergoes consecutive polymorph tuning of γ (−6 GPa), α (0 GPa), β (6 GPa, R3-Ni3TeO6 type), and δ (40 GPa, predicted P21/n double perovskite) phases with densified atomic packing.
研究领域:
材料科学
·
光学
·
固体化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-8
·
IF 16.6
Liu Changhao,Zhang Ningsi,Li Yang,Fan Rongli,Wang Wenjing,Feng Jianyong,Liu Chen,Wang Jiaou,Hao Weichang,Li Zhaosheng,Zou Zhigang
Durability is one prerequisite for material application. Photoelectrochemical decomposition of seawater is a promising approach to produce clean hydrogen by using solar energy, but it always faces the problem of serious Cl − corrosion. We find that the main deactivation mechanism of the photoanode is oxide surface reconstruction accompanied by the coordination of Cl − during seawater splitting, and the stability of the photoanode can be effectively improved by enhancing the metal-oxygen interaction. Taking the metastable β -Fe 2 O 3 photoanode as an example, Sn added to the lattice can enhance the M–O bonding energy and hinder the transfer of protons to lattice oxygen, thereby inhibiting excessive surface hydration and Cl − coordination. Therefore, the bare Sn/ β -Fe 2 O 3 photoanode delivers a record durability for photoelectrochemical seawater splitting over 3000 h.
研究领域:
材料科学
·
光电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·1-7
·
IF 2.8
Yuan Lifang,Wang Junzhong,Huang Zhijin,Shen Kaixiang
Long afterglow phosphors have garnered significant attention for their ability to emit light long after excitation ceases. Afterglow emission relies on metastable trap levels within the bandgap of the host materials. Effective trap engineering strategies to optimize traps are critical in determining the afterglow performance. In this study, we investigate the codoping of Bi 3+ and Er 3+ into LiTaO 3 to enhance afterglow performance. Through high-temperature solid-state synthesis, a series of LiTaO 3 :x%Bi 3+ , y%Er 3+ (x = 0 or 0.5%, y = 0.1–4.0%) samples were prepared successfully. Structural characterization confirmed the successful incorporation of Bi 3+ and Er 3+ into the Li⁺ sites without disrupting the host lattice. Photoluminescence studies revealed that Bi³⁺ codoping significantly enhances the green emission of Er³⁺, with optimal performance achieved at 1.0% Er 3+ doping. Thermoluminescence (TL) analysis demonstrated the presence of traps with the depth of 0.748 eV, enabling prolonged afterglow emission at room temperature. The afterglow mechanism involves charge carrier storage in traps under UV excitation, followed by thermal release and recombination at luminescent centers, facilitated by energy transfer from Bi 3+ to Er 3+ . This work provides a strategy for designing a long afterglow phosphor through controlled codoping, offering insights into trap engineering and energy transfer processes in perovskite-based luminescent materials.
研究领域:
材料科学
·
光学材料
·
固体物理
·
发光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Zhengxing Jiang,Hua Li,Rui Ai,Yuequan Deng,Yi He
Artificial enzyme mimics are more stable and cost-effective than bioenzymes, but they usually lack substrate recognition function. Here, we report that uranyl (UO22+) features efficient artificial peroxidase activity with a high specificity and can catalyze the oxidation of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium (ABTS) by H2O2 to yield green ABTS radical (ABTS•+), whereas other common substrates such as 3,3′-diaminobenzidine (DAB), 3,3′,5,5′-tetramethylbenzidine (TMB), o-phenylenediamine (OPD), and dopamine (DA) are not oxidized. The high specificity of UO22+ peroxidase mimic is ascribed to the electrostatic-driven coordination interaction between ABTS anion and UO22+ cation, and the orthorhombic metastudtite from the reaction between H2O2 and UO22+ rather than reactive radicals is identified as the key intermediate, which accounts for ABTS oxidation. On the basis of the UO22+ peroxidase mimic, a facile, low-cost, and reliable colorimetric assay is fabricated. The resulting colorimetric assay displays a good analytical performance for UO22+ detection in a linear range of 10–100 μM, along with a limit of detection of 0.5 μM. Further, the present colorimetric assay has a good selectivity toward UO22+ over common metal ions, which is applied for determination of UO22+ in natural water samples with satisfactory recovery results.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）