Journal of Physical Chemistry C
·
2024
·
IF 3.3
Xinmiao Gai,Jia Qu,Nan Zhang,Cun You,Fuqing Zhang,Tao Lv,Qiang Tao,Pinwen Zhu,Yan Li,Xin Wang
Bi2Ru2O7 is a weak metal pyrochlore with static disorder from lone-pair electrons. The suppression of static disorder can be observed by in situ Raman spectroscopy, and the abnormal turning point in resistivity can be found at high pressure. X-ray photoelectron spectroscopy (XPS) of bismuth and ruthenium, low-temperature magnetic susceptibility, and magnetization curve were studied, indicating that there were different valence states between bismuth and ruthenium. The in situ high-pressure structure evolution and conductivity in Bi2Ru2O7 were investigated up to 30.4 and 32.7 GPa, respectively. The electronic structure evolution was studied by first-principles calculations up to 30.0 GPa. Some of the Raman peaks related to static disorder were suppressed at around 2.5 and 18.0 GPa, respectively. The [RuO6] octahedron was compressed and distorted with pressure, and the triangular distortion increased in the range of 18.0 and 24.4 GPa. The high-pressure resistivity was measured by the four probe method. It slowly decreased at first and then increased slowly after 2.5 GPa due to the effects of static disorder and the applying pressure. After 18.0 GPa, the resistivity increased rapidly because of the pressure-induced lattice distortion, which led to the weakening of the conductivity of the sample under high pressure. All observations showed that the lattice distortion was influenced by the combined effects of static disorder and pressure before 18.0 GPa, which caused the resistivity to decrease first and then increase. As static disorder is suppressed, Bi2Ru2O7 is close to standard pyrochlore and the conductivity after 18.0 GPa, which is consistent with the theoretical calculation results of band gap.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2023
·
IF 2.8
Yanhui Zhang,Yun Yang,Xifa Long,Hualing Tian,Xiaofeng Gu,Zhi Su
A new alkali/alkali-earth metal pyrophosphate fluoride Na 2 Mg 2 P 2 O 7 F 2 without the structural disorder in the cuspidine family has been successfully prepared in the sealed system. Na 2 Mg 2 P 2 O 7 F 2 crystallizes in the space group P 2 1 / c (No. 14) of the monoclinic crystal system . The structure of Na 2 Mg 2 P 2 O 7 F 2 is shown to be an intricate three-dimensional (3D) framework that consists of the 2D layers [Mg 4 O 12 F 2 ] ∞ and the 1D chain [Na 2 O 8 F 3 ] ∞ interlinked by isolated P 2 O 7 groups, which demonstrates the precise coordination environment of cations and the framework in inorganic alkali/alkaline earth metal pyrophosphate fluoride. By comparing with other phosphate structures, we found that the introduction of F is conducive to the consistent arrangement of anionic group P 2 O 7 and enriches the diversity of cationic polyhedra. In addition, first-principle theoretical studies were also carried out to aid the understanding of microstructures, and Na 2 Mg 2 P 2 O 7 F 2 possesses a large band gap (7.1 eV) and has potential applications in the deep ultraviolet region.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yinyin Zhang,Fangzhong Liu,Ting Song,Yong Pei,Xianyou Wang,Xiongwei Wu,Manjun Xiao,Qi Deng,Bei Long
The electrochemical performances of LiNi 0.5 Mn 1.5 O 4 (LNMO) materials are strongly correlated with the ratio of disordered to ordered phases. Nevertheless, there are few reports on the adjustment of ordered and disordered phase ratio. In this paper, the ratio of ordered to disordered phases in LNMO is successfully adjusted by using a quaternary molten salt, which is proven by XRD refinement, FT-IR, and XPS. Reductive quaternary molten salt and Co doping are favorable for Ni/Mn cation disorder, leading to the increased disordered phase. LNMO with an appropriate ratio of ordered to disordered phases can exhibit enhanced electronic/ionic transfer rate and structural stability, revealed by electrochemical tests and ex situ characterizations. Therefore, the optimized material delivers a reversible capacity of 121 mA h g −1 at 20 mA g −1 and a long cyclic life with 61 mA h g −1 at 1000 mA g −1 over 1200 cycles. The present work offers a new idea for achieving a regulated ratio of ordered to disordered phases in LNMO.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Jiangtao Li,Xiaoxia Hu,Hong Liu,Jiansen Zhao,Mingchao Wang,Haiyan Du
Asymmetric ceramic membranes with disordered layer prepared by directional freeze-casting can be used as filter materials. However, there are few research achievements on the structural and permeability of disordered layers. Here, we obtained alumina asymmetric ceramic membranes with different disordered layer by adjusting the amount of alumina in the ceramic slurry. The results show that there are two kinds of structures in the disordered layer: spherical micropores and interconnected meshy pores, which lead to the change of airflow state. With the increase of the alumina content, the pore size of the disordered layer decreases and the network structure becomes complex, resulting in the decrease of the velocity of the inertial flow. The filter resistance of disordered layer increases obviously, but its proportion in the total filter resistance increases first and then decreases. The permeability is related to the pore size, specific surface area and channel complexity of the membrane.
研究领域:
材料科学
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 63
·36907-36914
·
IF 3.049
Xiongrui Jiang,Zhiyao Yan,Jing Zhang,Junzheng Gao,Wanxia Huang,Qiwu Shi,Hengzhong Zhang
Black TiO2 has received tremendous attention because of its lattice disorder-induced reduction in the TiO2 bandgap, which yields excellent light absorption and photocatalytic ability. In this report, a highly efficient visible-light-driven black TiO2 photocatalyst was synthesized with a mesoporous hollow shell structure. It provided a higher specific surface area, more reaction sites and enhanced visible light absorption capability, which significantly promoted the photocatalytic reaction. Subsequently, the mesoporous hollow black TiO2 with different lattice disorder-engineering degrees were designed. The structure disorder in the black TiO2 obviously increased with reduction temperature, leading to improved visible light absorption. However, their visible-light-driven photocatalytic efficiency increased first and then decreased. The highest value can be observed for the sample reduced at 350 °C, which was 2-, 1.4- and 5-fold that of the samples reduced at 320 °C, 380 °C and 400 °C, respectively. This contradiction can be ascribed to the varied functions of the surface defects with different concentrations in the black TiO2 during the catalytic process. In particular, the defects at low concentrations boost photocatalysis but reverse photocatalysis at high concentrations when they act as charge recombination centers. This study provides significant insight for the fabrication of high-efficiency visible-light-driven catalytic black TiO2 and the understanding of its catalysis mechanism.
研究领域:
材料科学
·
光催化技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Fang-xia XIE,Lu-lu ZHANG,Xiao ZHANG,Mei ZHANG,Xuan JIAN,Jian-xin LIU,Xiao-chao ZHANG,Ya-wen WANG,Rui LI,Cai-mei FAN
In order to simultaneously solve the problems of the poor light absorption capacity and high recombination rate of photogenerated carriers, Bi 5 O 7 Br photocatalyst with abundant ordered/disordered structures (O/D-Bi 5 O 7 Br) was prepared through a simple in situ disorder engineering. The prepared samples were characterized by XRD, TEM, HRTEM, SAED, XPS, UV-Vis diffuse reflectance spectra (DRS), and the activity was evaluated by photocatalytic degradation of tetracycline hydrochloride (TC) and hydrogen evolution under visible light irradiation. Results revealed that the ordered/disordered structure not only enhances the light absorption ability, uplifts conduction band position, facilitates the transfer and separation of photogenerated carriers, but also offers abundant unsaturated atoms as active sites for the photocatalytic process. Therefore, O/D-Bi 5 O 7 Br exhibits a high hydrogen evolution rate of 38.12 μmol/(g·h) and superior TC degradation rate of 86% within 135 min.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yuelin Lu,Jie Bai,Binbin Sun,Nannan Li,Zhenhuai Yang,Hailing Yu,Cong Wang,Cong Gu,Huan Liu,Peng Tang,Qiang Wang
MXene materials exhibit substantial energy storage capabilities owing to their high specific surface areas, tunable interlayer spacings, and excellent electrical conductivities. However, these layers are prone to re-stacking, negatively affecting the energy storage capacity of the material. Herein, through a process involving liquid nitrogen-assisted freeze-drying and subsequent annealing, Ti 3 C 2 T x nanosheets were combined with polyvinyl alcohol (PVA) polymer chains via hydrogen bonding to produce MXene and PVA-derived carbon composite aerogels (MPAs) with microstructures ranging from ordered to disordered arrangements. The incorporation of PVA inhibited nanosheet stacking, and PVA carbonization enhanced the electrical conductivity of the aerogel. The carbonized aerogel (MPA2.0) exhibited a larger specific capacitance along with a more disordered and denser microstructure, thereby accounting for the increased capacitance due to enhanced ion storage in the more structurally disordered carbon nanopores. The optimized MPA aerogel demonstrated a high power density, along with an excellent specific capacitance (MPA2.0 = 348.14 F g −1 , 2 mV s −1 scan rate), and a cycling stability of 92.52 % after 10,000 charge/discharge cycles. Furthermore, the MPA2.0-based supercapacitor obtained an impressive energy density (37.8 Wh kg −1 ) and an exceptionally high power density (1800 W kg −1 ) at a current density of 1 A g −1 . By adjusting the PVA loading, the shrinkage and stress–strain characteristics of the microstructure during freeze-drying and carbonization were altered, and the microstructural orientation of the resulting aerogels was controlled. The increased disorder in the aerogel enhanced its capacitor energy storage ability, providing a new approach for the design of multi-component high-performance hybrid supercapacitor electrodes.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Fangyu Xiong,Qinyou An,Lixue Xia,Yan Zhao,Liqiang Mai,Haizheng Tao,Yuanzheng Yue
Among the various types of cathode materials for sodium ion batteries , NaFePO 4 attracts much attention owing to its high theoretical capacity (155 mA h g −1 ), low cost, high structural stability, and non-toxicity. Nevertheless, the NaFePO 4 with maricite structure, thermodynamically stable phase, has been considered as electrochemically inactive for sodium-ion storage. In this work, we succeeded in tuning the degree of disorder in NaFePO 4 cathode material by a mechanochemical route to enhance electrochemical performances of Na-ion batteries. The derived NaFePO 4 cathodes containing both amorphous and maricite phases exhibit much improved sodium storage performance with an initial capacity of 115 mA h g −1 at 1 C and an excellent cycling stability of capacity retention of 91.3% after 800 cycles. By X-ray absorption near edge and Raman spectroscopy , we revealed the atom-scale structural origin of the enhanced Na-storage performances of the amorphous NaFePO 4 electrode. The transformation of edge-sharing FeO 6 octahedra into various FeO n polyhedra upon amorphization was found to be a key to attain the superior performances for Na ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Xing Xu,Lei Lai,Tao Zeng,Yan Yu,Zhiqiao He,Jianmeng Chen,Shuang Song
The exploration of low-cost, high-performance, and stable photocatalysts for the highly efficient conversion and storage of solar energy in hydrogen is of great importance. This study presents a novel pyridine-type carbonitrides (CN)-modified surface-disordered C-doped TiO2 (PCN/CTiO2@TiO2–x) catalyst used for photocatalytic H2 evolution from water. The employed preparation method of hydrolysis–calcination has the advantages of low-cost raw materials and easy scale-up. The optimized PCN/CTiO2@TiO2–x exhibited an impressive hydrogen evolution rate of ∼3743 μmol h–1 g–1 under simulated solar light (AM 1.5) and remained stable after five cycles. The maximal quantum efficiency reached 37.5% at 370 nm and 7.0% at 400 nm, which was superior or comparable to several reported relevant TiO2-based catalysts. Benefiting from the pyridine-type CN modification, disordered surface layer (TiO2–x), and increased oxygen vacancies/Ti3+ species, the photogenerated electrons moved rapidly from the visible-response C-doped TiO2 to CN to participate in the photoreduction reaction, which led to a marked improvement in the catalytic activity.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 5
·
IF 12.5
Zhuodong Tang,Jingyu Wu,Shaojun Wu,Wenjing Tang,Jian-Rong Zhang,Wenlei Zhu,Jun-Jie Zhu,Zixuan Chen
Enzymes facilitate the conversion of chemical energy into mechanical work during biochemical reactions, thereby regulating the dynamic metabolic activity of living systems. However, directly observing the energy release facilitated by fluctuating individual enzymes remains a challenge, leading to a contentious debate regarding the underlying reasons for this phenomenon. Here, we aim to overcome this challenge by developing an oscillating nanomotor powered by a single-molecule enzyme, which allows real-time tracking of energy transduction in enzymatic reactions. Through analysis of the shifts in free energy profiles within the nanomotors, our results unveil not only the heterogeneous energy release patterns of individual enzyme molecules but also the dynamic disorder of a particular enzyme in energy release over extended monitoring periods. By exploring six distinct types of single-molecule enzymatic reactions, we provide the direct evidence supporting the argument that the reaction enthalpy governs the enzymatic energy release. This approach has implications for understanding the mechanism of enzymatic catalysis and developing highly efficient nanomotors.
研究领域:
生物化学
·
纳米技术
·
酶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xiuhua Yang,Shuhong Xiang,Zhenyu Li,Jiahao Zhou,Boxiang Wang,Hong Chen,Ming Xiao
Disordered structures with short-range correlation exhibit unique photonic or thermal properties, often arising from the self-assembly of monodisperse microspheres. Colloidal clusters, aggregates of a defined number of microspheres, have anisotropic shapes and offer a unique approach to tailor the short-range correlation compared to traditional isotropic microspheres. However, this potential remains largely unexplored. To this end, we have prepared triangular and tetrahedral colloidal clusters and coassemble them with polystyrene microspheres into both monolayers and thick films (∼10 μm) over 5 mm × 5 mm areas. Through combining scanning electron microscopy images and laser scattering measurements, we show that increasing cluster concentration from 0% to 40% increases disorder in both thin and thick films. Beyond 40%, the short-range order in thin films plateaus, while it increases with triangular clusters but decreases with tetrahedral clusters in thick films. The distinct roles of triangular and tetrahedral clusters offer new insights into design of correlated disordered materials for novel applications.
研究领域:
材料科学
·
光学
·
热学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 2
·1006-1013
·
IF 11.301
Zhou Li,Weihui Zhang,Bingchuan Gu,Chenxi Zhao,Bangjiao Ye,Chong Xiao,Yi Xie
Low thermal conductivity is commonly seen in amorphous or disordered systems, in which electrical conductivity is also very low, bringing considerable obstacles to the development of high-performance thermoelectric materials. Present study highlights the vacancy cluster-induced local disordered structure in Cu2ZnSnSe4 for the simultaneous achievement of low thermal conductivity and high electrical conductivity, thereby significantly enhancing its thermoelectric property. Comprehensive evidences from positron annihilation and HRTEM characterizations indicated that the vacancies in cation-deficient (VCu, VZn, and VSn) samples existed as vacancy clusters containing both cation vacancies and intrinsic Se vacancies, which induced the formation of localized disorderly oriented domains. These cation deficiencies contributed to the improved electrical conductivity and power factor of the corresponding Cu2(1−x)Zn1−ySn1−zSe4 samples via an increase in the hole carrier concentration. Moreover, the induced local disordering contributed to further reduced thermal conductivity via stronger phonon scattering. As a result, enhanced ZT performance was achieved in all cation deficient samples. Among them, Sn-deficient Cu2ZnSnSe4 obtained the highest ZT value of 0.44 at 750 K, which was two times larger than that of pristine sample (ZT = 0.14 at 750 K). The cation–anion vacancy cluster and local disordered structure elucidated in the present work open up a new avenue to tackle the entanglement of thermoelectric parameters by proper vacancy modulation.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
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