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
·
物理学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xinqiang Liu,Haoran Yin,Shifan Zhang,Menghan Huang,Tayirjan Taylor Isimjan,Xiulin Yang,Dandan Cai
Strategically tuning the composition and structure of transition metal phosphates (TMPs) holds immense promise in the development of efficient oxygen evolution reaction (OER) electrocatalysts. However, the effect of crystalline phase transformation for TMPs on the catalytic OER activity remains relatively uncharted. In this study, we have deftly orchestrated the reaction process of anion-etched precursor to induce the amorphization process of FeCo-PO x from crystalline to amorphous states. The as-obtained amorphous FeCo-PO x (A-FeCo-PO x ) exhibited an optimized OER performance with a low overpotential of 270 mV at a current density of 10 mA cm −2 , which could be attributed to the flexibility of its amorphous structure and the synergistic effect of oxygen vacancies . Moreover, when incorporated into an overall water splitting (OWS) device configured as A-FeCo-POx (+) ||Pt/C (–) , it displayed long-term solid stability, sustaining operation for 300 h at a current density of 200 mA cm −2 . This work not only provides valuable insights into understanding the transformation from crystalline to amorphous states, but also establishes the groundwork for the practical utilization of amorphous nanomaterials in the field of water splitting.
研究领域:
材料科学
·
电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Qingqing Yang,Chaosheng Yuan,Yongfu Liang,Xiang Zhu,Zheng Wang,Kai Shi,Xuerui Cheng,Lei Su
The phase transition of pyrrole was studied under static pressure and dynamic pressure by in situ Raman spectroscopy. Under static compression, pyrrole underwent three phase transitions: a liquid-to-crystal (phase Ⅰ) transition at 1.15 GPa, followed by transformation into phase II at 7.45 GPa and the start of amorphous phase transition at 16 GPa. Under dynamic compression, pyrrole was compressed into an amorphous phase as the pressure increased from 0.71 GPa to 5.02 GPa, 8.07 GPa, 10.30 GPa, 11.30 GPa and 12.84 GPa within 5 ms, respectively. Rapid compression rate and high pressure provide a greater degree of disorder in amorphous pyrrole by fitting the partial Raman peak linewidth with pressure. During the pressure relief process, the amorphous pyrrole crystallized and transformed into phase II at 3.20 GPa and then reverted to its initial liquid state at around 0.55 GPa. The phase behaviors can be attributed to different solidification mechanisms of liquid pyrrole induced by different compression rates under the two compression conditions.
研究领域:
凝聚态物理
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材料科学
·
高压科学
·
光谱学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Tingting Yan,Han Li,Dongyang Xi,Lei Sun,Linan Liu,Dinghan Jin
This study investigated the behavior of energetic material 4-aminobenzamide (4-AMBZA; C 7 H 8 N 2 O) under high pressure utilizing Raman spectroscopy. Notable alterations were detected in the Raman spectra within 2.6–7.8 GPa, suggesting 4-AMBZA experiences a phase transition. Continued pressure caused the crystal to show a tendency towards amorphization. When the pressure is released, the amorphization phenomenon persists. Variations of N H bending vibration (amide II), C N stretching vibration (amide III), and C O stretching vibration (amide I) indicate that phase transition arises from the twisting and rearrangement of hydrogen-bonded networks. Hirshfeld surface energy were conducted to analyze intermolecular interactions within 4-AMBZA.
研究领域:
材料科学
·
化学
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DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Chengbo Li,Xian Zhong,Yuan Ji,Yawei Hong,Jiawei Li,Youpeng Wang,Hongliang Zeng,Chunxiao Liu,Zhaoyang Chen,Xu Li,Qiu Jiang,Tingting Zheng,Hong-Jie Peng,Xinyan Liu,Chuan Xia
The electrochemical conversion of CO2 into valuable chemicals under acidic conditions provides a promising solution to challenges, such as carbon loss and catalyst instability caused by carbonate precipitation. However, acidic CO2 electroreduction remains severely constrained by intense competition from the hydrogen evolution reaction (HER) and sluggish CO2 activation kinetics. Here, we report a bismuth (Bi) nanoparticle catalyst with an amorphous surface layer (a-Bi), which demonstrates high catalytic activity and selectivity toward formic acid (HCOOH) formation in acidic electrolytes. The catalyst achieves impressive Faradaic efficiencies for HCOOH production, exceeding 90% over a wide current density range (−100 to −1000 mA cm–2) with corresponding potentials ranging from −1.24 to −1.75 V versus the reversible hydrogen electrode (vs RHE). Notably, the partial current density for an HCOOH reaches an impressive value of more than −900 mA cm–2 at −1.75 V vs RHE. Furthermore, the a-Bi catalyst exhibited stability for over 52 h at high production rates (−500 mA cm–2) alongside a single-pass carbon efficiency of approximately 85%. In situ spectroscopy and theoretical simulation revealed that surface amorphization significantly enhances the adsorption of CO2 and lowers the hydrogenation barrier, thereby accelerating the CO2RR kinetics while effectively suppressing the HER. This work presents a facile crystallization engineering strategy to address critical carbon loss challenges, thereby advancing the sustainability and scalability of acidic CO2 electroreduction processes.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2014
·Vol. 115
·期 4
·
IF 2.185
Wang Pei,He Duanwei,Xu Chao,Ren Xiangting,Lei Li,Wang Shanmin,Peng Fang,Yan Xiaozhi,Liu Dongqiong,Wang Qiming,Xiong Lun,Liu Jing
Angle-dispersive synchrotron X-ray diffraction measurements were performed on vaterite-type YBO 3 /Eu 3+ , GdBO 3 , and EuBO 3 , respectively, up to 41 GPa at room temperature using a diamond-anvil cell. Pressure-induced amorphization was observed in hexagonal GdBO 3 with a significant compression along the c -axis. Compared to the ions of the distorted GdBO 3 phase, its anions may lose their long-range order prior to the cations at high pressures. Based on the experimental pressure-volume data, the obtained bulk moduli of YBO 3 /Eu 3+ and GdBO 3 are 329 and 321 GPa, respectively, which are more than 90% larger than that of EuBO 3 (167 GPa) and are presumably attributed to Gd 3+ and Y 3+ with a high density of d valence electrons.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Yan Wang,Jin Wang,Junxia Wang,Long Kang,Tongming Zhang,Xusheng Li,Yijie Tang
In this work, the helium irradiation effects were systematically investigated on MgO-Nd 2 Zr 2 O 7 (hereafter M-NZO) composite ceramics used for inert matrix fuel, in which the ion fluences range from 5 × 10 16 to 3 × 10 17 ions/cm 2 at room temperature. It was demonstrated that M-NZO composite ceramic shows superior radiation tolerance after He implantation. Specifically, MgO had almost no phase transition and extensive amorphization . And Nd 2 Zr 2 O 7 phase possessed slightly pyrochlore-fluorite-amorphization structural transformation, while part of Nd 2 Zr 2 O 7 maintained the ordered pyrochlore structure and co-existed with the irradiation-induced disordered fluorite structure. Importantly, GIXRD results indicated that MgO phase presents higher resistance to radiated damage than Nd 2 Zr 2 O 7 phase. Besides, SEM images illustrated that MgO particles have substantially less fragmentation than Nd 2 Zr 2 O 7 particles due to the higher thermal conductivity of MgO. It reconfirmed that MgO phase resists irradiation damage better than Nd 2 Zr 2 O 7 phase in post-irradiated M-NZO composite ceramics.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Min Wang,Kaisheng Chen,Guanjun Sun,Zihao Yan,Yongjun Chen,Hongtao Liu,Erling Zhao,Jianbao Li,Xiwen Du
The development of efficient electrocatalysts for hydrogen evolution reaction (HER) in neutral media remains a challenge due to their slow kinetics and low conductivity. Metal selenides are widely used as HER catalysts, but their structural stabilities are not good and the HER performances in neutral media need to be improved. Herein, we report the direct growth of Mo-doped CuSe (Mo 0.33 Cu 0.67 Se) nanosheets with edge-amorphization on Ni foam (NF) through a facile one-pot solvothermal method for the first time, which are inexpensive and possess high-HER performances in neutral media. It was found that Mo 0.33 Cu 0.67 Se only requires an overvoltage of 55 mV to reach a current density of 10 mA cm −2 (with a Tafel slope of 75 mV dec -1 ), which is superior to commercial 20 % Pt/C (73 mV). Doping CuSe with Mo could lead to amorphization of the edges of nanosheets, and both experimental and theoretical results verify that this structure is beneficial for reducing the oxidative dissolution of Se ion and improving stability. Meanwhile, it also optimizes the free energy of H 2 O dissociation, hydrogen adsorption and desorption, thereby effectively enhancing the performance of electrocatalytic hydrogen evolution in neutral media.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Hongyuan Yang,Ziliang Chen,Peifang Guo,Ben Fei,Renbing Wu
Developing a platinum-free hydrogen evolution reaction (HER) electrocatalyst that can steadily drive a large current density is of great significance in a commercially electrochemical water splitting technology. Herein, we show that the B-doping-induced amorphization of crystalline layered double hydroxide (LDH) activates it as an extremely efficient HER catalyst. The amorphous B-incorporated nickel-cobalt LDH supported on the nickel foam (A-NiCo LDH/NF) can yield large current densities at small overpotentials (100 mA cm –2 at 151 mV, 500 mA cm –2 at 286 mV, and 1000 mA cm –2 at 381 mV) with high durability in alkaline medium even after 72 h, which is even better than commercial platinum. This work may provide a promising way for structure tuning of transition metal LDH to effectively boost HER efficiency towards practical water electrolysis.
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
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Peng Wang,Tao Yu,Liping Hao,Xuanwen Liu
Efficient electrocatalysts are crucial for overcoming the sluggish kinetics of the oxygen-evolution reaction (OER) and facilitating the advancement of energy storage technologies such as metal-air batteries and hydrogen production through water electrolysis. This study proposes a synergistic approach combining amorphization and interfacial engineering to improve OER performance by fabricating heterojunctions between crystalline NiFe(OH) x and amorphous NiP x . The formation of a strongly coupled crystalline-amorphous heterojunction enables optimization of the electronic structure at the catalytic site and accelerates charge transfer at the interface, thereby improving the reaction kinetics. Notably, we investigate the dynamic adsorption behavior of PO 4 3− during the OER process by introducing Na 3 PO 4 into the electrolyte, revealing that P vacancies serve as active sites in promoting OER activity. Lastly, electrochemical measurements demonstrate that NiFe(OH) x /NiP x /NF exhibits a low overpotential of 220 mV at 10 mA cm −2 and Tafel slope of 35 mV·dec −1 , surpassing the performance of laboratory-prepared noble metal catalysts and most reported NiFe-based electrocatalysts.
研究领域:
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 51
·2308191
·
IF 19
Jianxi Lu,Songbo Chen,Yuling Zhuo,Xinya Mao,Dong Liu,Zhenbo Wang
Hydrogen production through seawater electrolysis faces several challenges, one of which involves the development of electrocatalysts with high catalytic performance. Here, surface amorphization and morphology engineering are combined to design a novel electrocatalyst for highly-efficient hydrogen evolution reaction (HER). The surface-amorphized MoO 2 /Ni 3 (PO 4 ) 2 microcolumns supported on nickel foam (SA-MoO 2 /Ni 3 (PO 4 ) 2 /NF) display remarkable performance with low overpotentials of 34 and 46 mV at a current density of 10 mA cm −2 in 1 m KOH and alkaline seawater, respectively. In addition, the alkaline electrolysis cell (AEC) integrated with SA-MoO 2 /Ni 3 (PO 4 ) 2 /NF as the cathode and Ni foam as the anode achieves a current density of 100 mA cm −2 at 1.87 V in 6 m KOH seawater at 60 °C, superior to that of industrial NiMo electrode as cathode (2.05 V). DFT calculations demonstrate that the surface amorphous layer (MoO x ) improves the hydrogen adsorption energy of sample and reduces the energy barrier of water dissociation. It is found that substantial improvement in catalytic performance stems from the synergistic effect between surface amorphization and unique microcolumn morphology. These findings may provide insights into combining surface amorphization and morphology engineering strategies to enhance catalytic performance and pave the way for the development of highly efficient seawater HER electrocatalysts.
研究领域:
材料科学
·
能源化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yijie Tang,Jin Wang,Junxia Wang,Long Kang,Tongming Zhang,Jun Li,Yan Wang,Xusheng Li
This paper reported the irradiation response of a 55 wt.% MgO-45 wt.% Nd 2 (Zr 1- x Ce x ) 2 O 7 (abbreviated to M-NZC x , x = 0, 0.3 and 1) composite ceramics used as candidate inert matrix fuel under 500 keV He 2+ ions with fluence of 1 × 10 16 –5 × 10 17 ions/cm 2 . The irradiation-induced lattice expansion, amorphization of MgO and NZC x phases and order-disorder transition of Nd 2 (Zr 1- x Ce x ) 2 O 7 pyrochlore were systemically explored via GIXRD, Raman and TEM techniques. And the detailed irradiation response at different depths of the typical M-NZC 0.3 sample was especially investigated via GIXRD and TEM. The results showed that the lattice expansion ratios ( Rs ) of MgO (M), ordered pyrochlore (P) and disordered defect-fluorite (F) structures of NZC x pyrochlore in the samples under the same dose of He 2+ irradiation were regular, which were ranged as the following order: Rs M < Rs P < Rs F . And there was a belt-shaped damage aggregation zone located near interphase boundary at the maximum damage depth of M-NZC 0.3 sample, which could be explained by the defect-absorption of boundary. And this defect-absorption of boundary was also found at any depth of M-NZC 0.3 sample. This work systematically analyzed α-decay irradiation response of different phases in M-NZC x composite ceramics applying for inert matrix fuel.
研究领域:
核材料科学
·
辐照效应研究
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产品关联
DOI
高影响因子
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