Nature Synthesis
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2025
·
IF 20
Wu Bei,Liu Xiaocheng,Liu Peigen,Wu Geng,Tian Lin,Han Xiao,Li Junmin,Hong Xun
Amorphous metal oxide (AMO) nanomaterials are attractive because of their unique short-range order structure, but controllable synthesis is still challenging. Here we report a Li + -assisted liquid-phase reduction method, which converts a series of crystalline metal oxides into amorphous structures (RuO x , PtO x , CuO x , NiO x , PdO x , MnO x and NiCoO x ). Taking RuO 2 as an example, in situ Raman and X-ray absorption spectroscopy indicate that the reduction of Ru–O coordination number and distortion of the medium-range structure of Ru–Ru during the amorphization process are caused by naphthalene radical anions and lithium ions. Theoretical calculations indicate that Li⁺ insertion in RuO x strengthens its electrostatic interaction with the naphthalene radical anion, accelerating the stripping of oxygen from Li⁺-inserted RuO x . The introduction of positive charge by Li⁺ insertion can disrupt the internal charge balance of crystal ruthenium oxide, and therefore reduce the formation energy of intermediates for producing amorphous RuO x . This strategy paves a way for achieving the controllable synthesis of AMOs.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2019
·
IF 2.6
Ang Qiao,Haizheng Tao,Yuanzheng Yue
Amorphous conductors with high ionic conductivity are a promising candidate as electrolytes in all-solid state batteries. In this work, we prepared amorphous Ag 3 PS 4 conductor via a chemo-mechanical milling process, and then characterized its structure and electrochemical properties . The results show that Ag + conductivity of the amorphous Ag 3 PS 4 was remarkably enhanced by three orders of magnitude compared to its crystalline counterpart. Furthermore, the amorphous sample exhibits lower activation energy ( E a ) for ionic conductivity as a function of temperature. Structural characterizations indicate that the tetrahedral [PS 4 ] units were retained in amorphous Ag 3 PS 4 , but the Ag + ions became more liberated than those in the crystalline state, leading to the enhanced migration of Ag + ions, thereby, the ionic conductivity in amorphous Ag 3 PS 4 is drastically increased. This work provides insight into the crucial role of the disorder in raising the ionic conductivity of amorphized chalcogenide materials containing mobile ions.
研究领域:
材料科学
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固体化学
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能源材料
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电化学
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无机非金属材料
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固态电池
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离子传导
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Touseef Ahmad,Sajid Rauf,Hafsa Mansha,Kashf Zman,M. Ahsan Masood,Muhammad Shahid Sharif,Sarfraz,Muhammad Khalid,Muhammad Faisal Anwar,Yuzheng Lu,Abdulaziz K. Assaifan,Naveed Mushtaq,Bin Zhu
High ion conductivity at low temperatures remains a serious challenge in materials science, hindering the development of next-generation energy and ionic devices. Here, we report a fundamentally new conduction mechanism in entropy-driven proton transport, which enabled by a hybrid amorphous–crystalline architecture in Eu 0.25 Sm 0.25 Al 0.5 O (ESAO). This material system achieves exceptional proton conductivity of 0.15 S/cm at 550 °C, we successfully architect an amorphous/crystalline hybrid structure via an internal entropy gradient that creates a chemical potential, thermodynamically guiding protons toward high-entropy in disordered regions. This strategy redefines super ion migration as a product of entropy-modulated potential landscapes, verified by HR-TEM, DSC, and spectroscopic characterizations. Compared to a pure amorphous analogue (SAO), ESAO exhibits significantly enhanced ionic transport, confirming the functional role of entropy. Our findings establish entropy as a design parameter not merely a thermodynamic descriptor-opening a broader paradigm for designing superionic materials rooted in configurational physics and energy landscape engineering.
研究领域:
材料科学
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固体物理
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能源材料
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离子器件
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yue Pan,Xiaohong Yuan,Yong Cheng,Baoyin Xu,Shucheng Liu,Zhitong Wang,Shida Wang,Kuo Hu,Shengcai Zhu,Quanjun Li,Ming-sheng Wang,Zhaodong Liu,Hu Tang,Bingbing Liu
Synthesizing fully sp 3 -bonded non-crystalline carbon remains a long-standing challenge due to the intrinsic instability of the sp 3 bond at ambient pressure. Recently, paracrystalline diamond, a new-form sp 3 -bonded non-crystalline carbon consisting of sub-nanometer-sized paracrystallites, has been synthesized from face-centered cubic C 60 at 30 GPa, which has attracted attention due to its unique structural features and excellent physical properties. However, the ultrahigh synthesis pressure of paracrystalline diamond poses an obstacle to its large-scale production and applications. In this study, paracrystalline diamond is synthesized at an exceptionally low pressure (16 GPa) via inducing uniaxiality at high-pressure and high-temperature conditions, thereby breaking through the temperature-pressure phase diagram of C 60 . By combining structural characteristics and advanced molecular dynamics simulation, the remarkable reduction of synthesis pressure is attributed to the fact that the symmetry of the C 60 cage is broken due to the uniaxiality, which further allows the C 60 cage to collapse at much lower pressures. This work reveals the critical role of uniaxiality in the reduced-pressure synthesis of paracrystalline diamond, which may provide a potent methodological strategy for the development of novel low-cost high-pressure materials.
研究领域:
材料科学
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物理学
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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
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Jiehong He,Pin Lyu,Bo Jiang,Shaoshuai Chang,Haoran Du,Jian Zhu,Hexing Li
Photocatalytic CO 2 hydrogenation into fuels and value-added chemicals is considered as a promising strategy for CO 2 conversion and utilization. However, the photocatalysts used usually displays low efficiency and poor durability. Herein we developed a novel catalyst by combining NiB amorphous alloy with In 2 O 3 semiconductor, which exhibited very high HCOOH yield (5158.0 umol g −1 h −1 ) in CO 2 hydrogenation under sunlight irradiation. The In 2 O 3 acted as a photocatalyst for generating photoelectrons to reduce CO 2 and provided sufficient surface hydroxyl (In−OH) groups favouring CO 2 adsorption during the reaction. The high dispersion of NiB nanoparticles (co-catalyst) and interaction with In 2 O 3 provided the rich interface between NiB and In 2 O 3 , favoring the surface reactions between CO 2 and H 2 . Meanwhile, the unique amorphous alloy structure made the Ni electron-enriched, which promoted CO 2 hydrogenation through the H 2 dissociation. More importantly, the NiB amorphous alloy with good electric conductivity facilitated the transfer of photoelectrons from In 2 O 3 , which sufficiently diminished the photoelectron-hole recombination, leading to the enhanced quantum efficiency in photocatalytic CO 2 hydrogenation.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Chuanliang Wei,Huifang Fei,Yuan Tian,Yongling An,Huanhuan Guo,Jinkui Feng,Yitai Qian
Li metal is regarded as the most promising anode for lithium-based batteries due to its extremely high theoretical capacity and the lowest working potential. However, dendrite caused by uneven Li deposition inhibits its practical application. Here we propose a new concept of utilizing amorphous metallic nucleation seeds to induce the uniform deposition of Li. Amorphous 3 °C liquid metal coated on MXene framework is selected as an example for deep investigation. The results indicate that amorphous liquid metal nucleation seeds are stable against MXene and can induce isotropic nucleation and uniform growth of Li. The Coulombic efficiency and performance of symmetric cells are obviously improved both in ether-based and carbonate-based electrolyte under the regulation of amorphous liquid metal seeds. Full lithium metal cells with LiFePO 4 and crumpled MXene nanosheet encapsulated LiMn 2 O 4 cathodes also exhibit better electrochemical performance after modification. Additionally, the concept may be useful for developing other metal based anodes.
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
Nanoscale
·
2020
·Vol. 12
·期 20
·11267-11279
·
IF 6.895
Hongkai Zhao,Xiaoxia Li,Mingyue Zheng,Xian Zhao,Qun Zhang,Yi Luo,Weiliu Fan
The construction of both highly efficient and stable hybrid artificial photosynthetic systems comprising semiconductors as photosensitizers and abundant metal-based molecular complexes as cocatalysts for photocatalytic H2 generation remains challenging. Herein, we report an effective and stable CdS/cobaloxime hybrid system prepared by inserting an amorphous TiO2 (a-TiO2) interlayer with adjustable thickness and by covalently-surface-attaching molecular cobaloxime catalysts. This hybrid system displayed outstanding photocatalytic H2 production and reached a maximum rate of ∼25 mmol g−1 h−1, which was ∼20.8 times that of pure CdS and 1.7 times that of the CdS/cobaloxime system without an a-TiO2 interlayer (CdS/Co). More importantly, 6 nm a-TiO2 uniformly coated CdS nanorods (CdS NRs) exhibited exceptional 200 h long-term catalytic behaviour under ≥420 nm visible light irradiation. However, the H2 production performance of the CdS/Co hybrid system decreased significantly over 10 h. Density functional theory (DFT) calculations indicated that the a-TiO2 surface can provide abundant bonding sites for the effective immobilization of molecular catalysts. Moreover, Mott–Schottky electrochemical measurements and femtosecond transient absorption spectroscopy revealed that the a-TiO2 interlayer had favourable band levels that could fasten the photoexcited electron transfer from CdS to molecular cobaloxime and could extract holes with intraband electronic states generated by defects, thus prohibiting CdS photocorrosion and improving the stability of the hybrid system. This study proposes a strategy for designing multifunctional interlayers for the effective immobilization of molecular catalysts, beneficial regulation of photoinduced charge carriers, and improvement of the stability as well as facilitation of the construction of artificial photosynthetic hybrid systems with high efficiency and durability.
研究领域:
材料科学
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光化学
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能源科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·
IF 13.325
Li Junjun,Wu Lin,Liu Pengfei,Liu Lanjun,Zhang Bo
The effect of annealing temperature of Fe 78 Si 9 B 13 amorphous ribbons for activation of persulfate on azo dye Orange G degradation was investigated. The ribbons annealed below 623 K have very rapid degradation rate, and the degradation efficiency within 10 min was 97%. The kinetic analysis elucidated that the degradation process could be described by pseudo-first-order kinetic model. The reaction rate was not strictly decreased with the increasing annealing temperature. In particular, the ribbons with different structures by annealing at different temperatures, after the reaction, show obviously discrepant surface corrosion morphology which also plays a role in the reaction rate. Keywords Amorphous ribbon Annealing temperature Persulfate Azo dye
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2017
·Vol. 121
·期 12
·
IF 2.068
Wu Lei,Dai LiDong,Li HePing,Hu Haiying,Zhuang YuKai,Liu KaiXiang
We present a pressure-induced amorphization for pure and 0.5 mol. % Bi 3+ -doped Zn 2 GeO 4 samples, measured by high pressure Raman spectroscopy and high resolution transmission electron microscopy. Pressure-induced conductivity switching phenomena were discovered for both samples at around ∼7.01 GPa and ∼11.11 GPa, respectively, which closely correlated with the crystalline-to-amorphous transformation. The detailed conduction mechanism and the defect reaction process at high pressure indicate that the application of pressure could efficiently manipulate the microstructure and electrical performance of rare-earth doped polycrystalline materials, and therefore holds great promise for numerous applications in the future.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 7
·1567-1572
·
IF 4.154
Wanchun Qiao,Ang Qiao,Yunhang Tao,Shaoxuan Gu,Yuanzheng Yue,Haizheng Tao
Graphical Mill and heat : A chemo-mechanical milling process is used to prepare a highly conductive amorphous 0.5AgI ⋅ 0.5 Ag 3 PS 4 conductor. The mechanisms of the enhancement in ionic conductivity for the present 0.5AgI ⋅ 0.5 Ag 3 PS 4 amorphous powder together with the heat-treated one are discussed. Through a chemo-mechanical milling process, we prepared a highly conductive (1.1×10 −3 S ⋅ cm −1 ) amorphous 0.5AgI ⋅ 0.5 Ag 3 PS 4 conductor, which is much higher than that of pure amorphous Ag 3 PS 4 (8.5×10 −4 S ⋅ cm −1 ). Detailed structural characterizations indicate that compared to the ionic conductivity of the amorphous Ag 3 PS 4 conductor, the enhancement can be ascribed to the formation of mixed polymeric anions {[PS 4 ] m I n } around Ag + ions. Through heat-treatment at 370 °C for 20 minutes, the room temperature ionic conductivity of the 0.5AgI ⋅ 0.5 Ag 3 PS 4 conductor is further enhanced by about 4 times. This enhancement can be ascribed to the following two aspects: 1) the existence of residual amorphous phase with higher ionic conductivity; 2) the connection of the fast ionic conductive interfaces between the deposited Ag 7 PS 6 nano-crystals and the residual amorphous phase. This work reveals the key roles of both disorder and interface in improving the ionic conductivity of solid-state electrolytes.
研究领域:
材料科学
·
固态离子学
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产品关联
DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 4
·1383-1388
·
IF 8.1
Cheng Changgen,Ao Weidong,Ren Huijun,Fan Zhishuai,Xu Tingting,Dai Lei,Yin Peiqun
In this work, we have successfully constructed carbon nanotube (CNT)-a-CoS x amorphous heterostructured catalysts using a two-step method. The abundant active sites, superior electron transport properties, and large electrochemically active specific surface area enable amorphous CNT-a-CoS x to exhibit higher hydrogen evolution reaction performance than crystalline CNT-c-CoS x in acidic conditions. To deliver a cathodic current density of 10 mA cm −2 , the required overpotential is only 76 mV. No significant performance degradation is observed after 60,000 s of electrochemical durability test. This facile strategy provides technical support for the design and construction of amorphous heterostructured electrocatalysts with high activity and stability for the generation of green hydrogen.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
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