JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Chunyan Li,Xin Li,Huiqin Wang,MengLing Zheng,Fang Tian,RuYong Tan,Pengwei Huo,Yan Yan,Xinkun Wang
Ternary metal layered double hydroxides (LDHs) have been widely used in supercapacitors (SCs) due to their polyvalent state and high electrochemical activity. In this study, Ga (III) doped NiCo layered double hydroxides (NiCoGa-LDHs) electrode material is prepared on carbon cloth (CC) by simple one-step hydrothermal method for the first time. The effects of Ga 3+ with different molar ratios on the structure, morphology, crystallinity, ion transport mechanics and electrochemical properties of ternary LDHs electrode materials are systematically investigated. At Ga 3+ = 1.0, the as-synthesized Ni 1 Co 3 Ga 1 -LDHs@CC exhibits a special electrochemical capacitance of 2012.5 F g -1 at 1 A g -1 with 57.7% capacitance retention observed at 5.0 A g -1 . The synthesis and evaluation of the two bimetallic NiCo-LDHs and NiGa-LDHs are similar in order to demonstrate the performance improvement of gallium heterovalent substitution. And heterovalent substitution of gallium for cobalt ion and nickel ion is proved indirectly. An Asymmetric supercapacitors (ASCs) device is assembled with Ni 1 Co 3 Ga 1 -LDHs@CC as anode and mesoporous carbon (MPC) as cathode, providing a high energy density of 84.22 Wh kg -1 at a power density of 800.1 W kg -1 , with excellent cyclic stability. This study provides a new way to improve the electrochemical performance and stability of ternary metal LDHs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2017
·
IF 4.636
Wenwu Zhou,Qing Zhang,Yasong Zhou,Qiang Wei,Lin Du,Sijia Ding,Shujiao Jiang,Yanan Zhang
USY zeolites have been modified by incorporation of gallium, phosphorus and a combination of gallium and phosphorus by wetness impregnation method using gallium nitrate and ammounium phosphate diabasic, and the corresponding NiMo supported hydrodesulfurization (HDS) catalysts have been prepared for HDS of an inferior FCC diesel. The individual physical-chemical properties of the modified USY zeolites and the series NiMo supported catalysts were characterized using XRD, N 2 -adsorption-desorption(BET), NH 3 -TPD, Py-FTIR, H 2 -TPR, HRTEM and XPS methods, and their catalytic performances for an inferior FCC diesel HDS were assessed. The results show that both gallium and phosphorus modification can modulate the acid property of USY zeolite and weaken the interaction between the active metal and the supports, thus enhancing the degree of sulfidation and the dispersion of Mo species that are beneficial for the HDS of highly refractory organosulfur compounds. The highest HDS and HDN efficiencies of 99.7% and 99.6%, respectively, were observed over the catalyst containing the PGaUSY zeolite. More importantly, gallium modification of the USY zeolite promotes the hydrodesulfurization of all organosulfur compounds, and especially 4,6-DMDBT, in the FCC diesel and phosphorus modification of the USY zeolite promotes the hydrodesulfurization of most organosulfur compounds except for 4,6-DMDBT in the FCC diesel.
研究领域:
催化化学
·
石油加工工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 10
·854
·
IF 3.444
Jian Li,Xiangyu Li,Derun Hua,Xinning Lu,Yujue Wang
A series of gallium-containing MFI (Ga-MFI) zeolites with varying Ga2O3/Al2O3ratios were synthesized using hydrothermal synthesis and tested as catalyst in catalytic fast pyrolysis (CFP) of beech wood for aromatic production. The results show that the incorporation of Ga slightly reduced the effective pore size of Ga-MFI zeolites compared to conventional HZSM-5 zeolites. Therefore, the Ga-MFI zeolites increased the aromatic selectivity for smaller aromatics such as benzene, toluene, andp-xylene and decreased the aromatic selectivity for bulkier ones such asm-xylene,o-xylene, and polyaromatics in CFP of beech wood relative to HSZM-5. In particular, the yield and selectivity ofp-xylene, the most desired product from CFP of biomass, increased considerably from 1.64 C% and 33.3% for conventional HZSM-5 to 2.98–3.34 C% and 72.1–79.6% for the synthesized Ga-MFI zeolites. These results suggest that slightly reducing the pore size of MFI zeolite by Ga incorporation has a beneficial effect on optimizing the aromatic selectivity toward more valuable monoaromatic products, especiallyp-xylene, during CFP of biomass.Keywords:aromatics;biomass;MFI zeolites;gallium;catalytic fast pyrolysis
研究领域:
能源化学
·
材料科学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 12
·4903-4908
·
IF 4.569
Ling Luo,Linan Wang,Chen Bai,Jiazheng Zhou,Lai Wei,Xin Su
A Ga-enriched ternary alkali-metal sulfide Na4Ga8S14 has been synthesized by a high temperature solid-state reaction. It crystallizes in the centrosymmetric Pbca (no. 61) space group with cell parameters a = 13.5260(4) Å, b = 11.4979(3) Å, c = 29.9592(9) Å, and Z = 8, and exhibits a three-dimensional (3D) network structure constructed from unique [Ga12S42] 12-membered rings, one-dimensional ∞[Ga4S11] chains, individual [GaS4] units and Na+ ions. The experimental band gap of Na4Ga8S14 was measured as ∼3.57 eV. Theoretical calculations indicate that the title compound is a direct band gap compound and the band gap is mainly determined by [GaS4] units. Meanwhile, statistical analysis shows that the atomic ratio N (N = AIAII/Ga, where AI = alkali-metal, AII = alkaline earth-metal) can be used to regulate the connection of [GaS4] units from zero-dimensional (0D) isolated groups, one-dimensional (1D) chains, and two-dimensional (2D) layers to 3D frameworks in Ga-containing alkali- and/or alkaline earth-metal chalcogenides. The results enrich the diversity of alkali-metal sulfides and give an insight into the structural regulation of alkali- and/or alkaline earth-metal chalcogenides.
研究领域:
材料科学
·
固体化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 9
·4591-4599
·
IF 5.8
Ouyang Lin,Lijin Wang,Xiulin Xie,Shuaibing Wang,Yibo Feng,Jiawen Xiao,Yu Zhang,Aiwei Tang
Silver-based I–III–VI-type semiconductor nanocrystals have received extensive attention due to their narrow-band luminescence properties. Herein, we demonstrated a seed-mediated growth of quaternary Ag–In–Ga–S (AIGS) nanocrystals (NCs) with narrow-band luminescence. By conducting partial cation exchange with In3+ and Ga3+ based on Ag2S NCs and controlling the Ag/In feeding ratios (0.25 to 2) of Ag–In–S seeds as well as the inventory of 1-dodecanethiol, we achieved optimized luminescence performance in the synthesized AIGS NCs, characterized by a narrow full width at half maximum of less than 40 nm. Meanwhile, narrow-band luminescent AIGS NCs exhibit a tetragonal AgGaS2 crystal structure and a gradient alloy structure, rather than a core–shell structure. Most importantly, the kinetics decay curves of time-resolved photoluminescence and the ground state bleaching in transient absorption generally agree with each other regarding the lifetime of the second decay component, which indicates that the narrow-band luminescence is due to the slow radiative recombination between trapped electrons and trapped holes located at the edge of the conduction band and the deep silver-related trap states (e.g., silver vacancy), respectively. This study provides new insights into the correlation between the narrow-band luminescence properties and the structural characteristics of AIGS NCs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yonggang Gang,Zijiang Zhao,Zemin Xu,Xuping Ren,Jun Wang,Wenjun Zhang,Yanhui Long,Liboting Gao,Xiaodong Li,Jianhua Yan,Hao Zhang
Ga doping constructs novel LaGaO x /Cu interfacial structure. • LaGaO x /Cu interfaces stabilize Cu + species by electronic metal-support interaction (EMSI) for methanol synthesis. • Ga incorporation promotes adsorption of H 2 , CO 2 and CO. • LOC/Cu:5Ga delivers a methanol space-time yield of 306.7 g kg cat −1 h −1 . • Ga-induced interfaces shift the reaction from a single to a dual-path mechanism. Developing efficient copper-based catalysts for CO 2 hydrogenation to methanol remains a key challenge in catalytic CO 2 utilization. Irreducible rare-earth oxides offer outstanding thermal stability and structural robustness, yet their limited activity and selectivity restrict methanol productivity. Herein, we propose a promoter-induced interfacial engineering strategy to activate La 2 O 2 CO 3 (LOC)-supported Cu catalysts by incorporating Ga as a heteroatom promoter. A series of Ga-doped LOC/Cu catalysts (denoted as Cu:xGa) were synthesized via a two-step co-precipitation method, exhibiting a pronounced dependence of catalytic performance on Ga loading. The optimized Cu:5Ga catalyst achieved a CO 2 conversion of 9.2% and a methanol space-time yield of 306.7 g kg cat −1 h −1 (3 MPa, 260 °C), corresponding to a 9.8-fold enhancement relative to undoped Cu. Comprehensive structural and spectroscopic characterizations reveal that Ga doping induces the formation of highly dispersed LaGaO x /Cu interfacial sites. The enhanced electronic metal-support interaction (EMSI) at these interfaces optimizes the electronic structure of Cu sites, facilitating reactant activation and further boosting methanol synthesis. These interfaces stabilize interfacial Cu + species, facilitating the dissociation and adsorption of reactants, and fundamentally modify the reaction pathway from a single formate route to a dual mechanism involving both the formate pathway and the RWGS–CO hydrogenation pathway. This work demonstrates an effective strategy to activate irreducible rare-earth oxide–supported Cu catalysts and provides mechanistic guidance for the rational design of efficient and stable catalysts for CO 2 hydrogenation to methanol. Efficient synthesis of methanol via a promoter (Ga)-induced interfacial engineering strategy to activate La 2 O 2 CO 3 (LOC)-supported Cu catalysts, corresponding to a 9.8-fold enhancement relative to undoped LOC/Cu catalyst. Download: Download high-res image (133KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2025
·
IF 3.3
Shihao Fu,Pingmei Li,Shiyu Yu,Yang Hu,Yibo Liu,Daming Chen,Yaqing Wei,Yuanxun Li,Yong Chen
The garnet-type Li 7 La 3 Zr 2 O 12 (LLZO) has garnered significant attention due to its superior thermal stability and broad electrochemical window. However, LLZO exhibits instability at room temperature and readily transforms from a cubic phase ( c -LLZO) to a tetragonal phase ( t -LLZO), resulting in issues such as low ionic conductivity. Herein, the effect of Ga doping on LLZO is investigated. Combined with SEM, activation energy, ionic conductivity and XRD refinement, the results demonstrate that Li 7-3x Ga x La 3 Zr 2 O 12 exhibits better properties when x = 0.25. Solid-state nuclear magnetic resonance (SSNMR) showed that Ga0.25-LLZO was favorable for promoting Li + transport. Moreover, Li| [email protected] |Li symmetric cells exhibit lower interfacial specific impedance (IASR) and higher critical current density (CCD) than both Li|Ag@Ga0-LLZO|Li and Li| [email protected] |Li and was stabilized at 0.15 mA/cm 2 for 1300 h of stable cycling. In addition, the all-solid-state battery Li| [email protected] |LFP was cycled at 0.2C for 100 cycles with 82 % capacity retention, demonstrating its promising application in lithium batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Dong Wang,Huijuan Wu,Xiangbin Chen,Ning Qi,Man Jiang,Zhiquan Chen
In this paper, gallium-doped indium oxide (In2O3) compounds with different doping amounts were fabricated through the hydrothermal method and the Spark Plasma Sintering process. X-ray diffraction showed that Ga was efficiently doped into the In2O3 lattice. The electrical conductivity is significantly improved by Ga doping, which is due to the reduced potential barrier of the carriers for the transition to the conduction band. The carrier concentration of Ga-doped In2O3 reaches 1.11 × 1020 cm–3, which is 12 times that of pristine In2O3, and the electrical conductivity (6.79 × 104 S m–1) is 5 times that of pristine In2O3. Furthermore, the lattice distortion in the doped sample acts as strong phonon scattering centers, which effectively reduce the mean free path of the phonons, resulting in a significant decrease in the lattice thermal conductivity. Finally, at 873 K, the zT value of In1.88Ga0.12O3 reaches 0.22, which shows a 100% increase compared with that of the pure In2O3 sample. Our results show that the control of metal doping and microstructure can achieve synergistic optimization of the electrical properties and thermal conductivity of In2O3, providing a reference for other thermoelectric materials.
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
ECS Journal of Solid State Science and Technology
·
2018
·Vol. 7
·期 6
·N96
·
IF 1.808
Xiao Liu,Huiling Du,Jing Shi,Huicong Hu,Xingchen Hao
Recently, ferroelectrics of Bi0.5Na0.5TiO3 (BNT) based perovskite-structured oxides that exhibit ionic conductive grain have attracted great attention, and been proved to be highly dependent on the chemical composition. Herein, effects of Sr and Ga acceptors co-doping on the impedance characteristics and electric properties of non-stoichiometric BNT ceramics were studied. It indicates that the conductivity of BNT ceramics is significantly improved after introducing a certain amount of Sr and Ga, where the grain conductivity and grain boundary conductivity can be clearly distinguished. The inhomogeneity is reflected in which the acceptors preferentially diffuse along the grain boundaries with the change in activation energy. The conductivity could be influenced associated with dopant-vacancy defect complexes as the increasing of dopant content and sintering time. Ionic dominated conductive properties easily mixed with electronic contribution can be derived at different atmospheres. The degree of diffuseness and relaxation are enhanced monotonically with dopant concentration that revealed by a modified Curie-Weiss law at the high frequency.
研究领域:
材料科学
·
固态离子学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Xianglei Liu,Tong Wang,Ke Gao,Xianguang Meng,Qiao Xu,Chao Song,Zhonghui Zhu,Hangbin Zheng,Yong Hao,Yimin Xuan
Solar thermochemical CO2 splitting to produce fuels is an effective route to reduce carbon emission. However, it is still a daunting challenge to achieve a high CO yield and good cycle stability simultaneously at a low reaction temperature. Here, Ca- and Ga-doped LaMnO3 is introduced for solar thermochemical CO2 splitting with an ultrahigh CO yield and excellent cycle stability at a moderate operation temperature. The average CO production reaches 513 μmol/g for La0.6Ca0.4Mn0.8Ga0.2O3 when operating between 1350 and 1050 °C. Such a high value sets a record among directly measured thermochemical CO production in the literature with the temperature swing limited within 300 °C. No obvious performance deterioration over eight cycles is observed due to stable structures. The high CO production of La0.6Ca0.4Mn0.8Ga0.2O3 can be attributed to the transition of the surface reaction to internal bulk diffusion induced by Ca doping and enhanced non-stoichiometry due to Ga doping. This work provides a promising alternative for solar thermochemical CO2 splitting with high fuel yield and cycle stability.
研究领域:
材料科学
·
可再生能源
·
催化
·
无机化学
✓ 已验证
DOI
高影响因子
Advanced Energy and Sustainability Research
·
2022
·Vol. 3
·期 7
·2200006
·
IF 0
Shasha Hao,Shaotang Yu,Xinge Liu,Bingyan Li,Shuaiqi Han,Hao Xin,Weibo Yan,Wei Huang
Copper indium gallium selenide Cu(In,Ga)Se 2 (CIGS) solar cells fabricated by vacuum thermal evaporation, magnetron sputtering, or organic solvent solution-process either lead to high manufacturing cost and film nonuniformity or cause explosion, toxication and pollution. To address these issues, herein, water as a solvent to prepare the CIGS precursor solution is used and 7.04% efficient CIGS solar cells without MgF 2 antireflection layer is obtained. Furthermore, for the first time, K doping on CIGS films via adding “K + ” into the aqueous precursor solution is conducted. K–In–Se species is formed in the process of selenization and acts as a Se reservoir during CIGS grain growth, resulting in improved quality of the CIGS film with much larger grains. K doping can also inhibit the loss of Ga element. The high-bandgap K–In–Se phase and higher Ga content combine to result in the increase in the CIGS bandgap. As a result, the K-doped CIGS solar cell achieves a 33.1% enhancement in efficiency to 9.37%, with the significant increase in the open-circuit voltage from 520.5 to 597.1 mV and fill factor from 50.77 to 55.36%. These results provide an important preliminary foundation for the development of aqueous precursor solution-based CIGS solar cells.
研究领域:
光伏技术
·
材料科学
·
薄膜太阳能电池
·
半导体材料
✓ 已验证
DOI
Science China-Materials
·
2023
·Vol. 66
·期 5
·1989-1996
·
IF 8.1
Yang Zhiyu,Zhao Yifei,Ueda Jumpei,Molokeev Maxim S.,Shang Mengmeng,Xia Zhiguo
Blue-light-excitable red-emitting phosphors with high thermal stability are essential for fabricating white light-emitting diodes (WLEDs). Herein, Ce 3+ -doped SrLaScO 4 (SLO:Ce 3+ ) phosphor is discovered to have an abnormal red emission band centered at 640 nm when excited at 440 nm. Spectroscopy and structural analyses confirm that Ce 3+ ions occupy the [LaO 8 ] polyhedrons competitively, generating a strong crystal field splitting and a large Stokes shift to produce a red emission. To further restrict the thermal quenching of SLO:Ce 3+ , charge-transfer engineering is implemented by incorporating a large electronegative Ga 3+ in the Sc 3+ site, which can attract more charges from nearby coordinating groups to decrease the electronic occupation at the bottom of the conduction band and thereby enlarge the band gap. Sc/Ga substitution in SrLa(Sc,Ga)O4:Ce 3+ enhances the thermal stability by increasing the intensity ratio from 15% to 31% at 150°C compared with 20°C. This is attributed to the efficient suppression of the thermally stimulated ionization process. This study presents a general design principle for discovering novel Ce 3+ -doped red phosphors with good thermal stability for WLED applications.
研究领域:
材料科学
·
光子学
·
固态化学
·
光电材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）