CATALYSIS TODAY
·
2022
·
IF 6.562
Yumeng Xia,Zehua Li,Ying Li,Kai Cai,Yunduo Liu,Jing Lv,Shouying Huang,Xinbin Ma
Dimethyl ether (DME) carbonylation is an important reaction for methyl acetate (MA) and ethanol production from syngas. Mordenite (MOR) has been used as an industrial catalyst due to the competitive catalytic properties, especially with extremely high selectivity of MA (>99%). Given the Brønsted acid sites (BAS) in 8-MR are proved the active centers, the properties of BAS are crucial factors that influence the reaction. Until now, most of the researches focus on increasing the number of BAS rather than tuning the acid strength. Here we modified H-MOR by Ga introduction using incipient wetness impregnation. Catalyst evaluation results suggest that Ga species can enhance DME conversion with a maintained MA selectivity. Combining with characterizations and DFT calculation, the textural and acidic properties along with the existing form of Ga species are determined. Further in-situ IR, theoretical and kinetics investigations demonstrated that the enhanced acid strength accelerates the reaction on Ga-modified MOR catalysts. This work inspires us that improving the acid strength is an efficient strategy for Brønsted acid-catalyzed reaction, such as DME carbonylation .
研究领域:
催化化学
·
理论计算化学
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JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Bang Lan,Renping Cao,Ting Chen,Lan Li,Ru Liu,Xuehua Yi,Shuijing Nie,Jing Wang
LaSrRO 4 :Mn 4+ (R = Al and Ga) are prepared by the high-temperature solid-phase method in air. Their luminescence properties, crystal structure, concentration dependent spectra, time-resolved spectra, fluorescence lifetime, and luminous mechanism are systematically researched, respectively. Mn 4+ ion is the luminescence center of LaSrRO 4 :Mn 4+ (R = Al and Ga). The excitation spectra of LaSrRO 4 :Mn 4+ (R = Al and Ga) under monitored at 715 nm lie in the range 210 – 650 nm with two main excitation peaks at ∼360 nm and 520 nm. With the excitation at 360 and 520 nm, LaSrRO 4 :Mn 4+ (R = Al and Ga) emit far-red light and have the emission spectra covering the region from 650 to 800 nm due to the 2 E g → 4 A 2g transition of Mn 4+ ions. The ideal Mn 4+ concentration in LaSrAlO 4 :Mn 4+ and LaSrGaO 4 :Mn 4+ are ∼ 0.4 mol% and 0.6 mol%, respectively. The spectral properties of samples verify the crystal field s via the Tanabe-Sugano energy level diagram of Mn 4+ ion. LaSrRO 4 :Mn 4+ (R = Al and Ga) have the emission spectra match with the absorption spectra of the plant photosensitive pigments red light and far-red light, which infers their promising application in plant growth light-emitting diode (LED) lamp
研究领域:
材料科学
·
光学
·
植物学
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yulan Xu,Minxian Wu,Xinlei Cheng,Shiying Wang,Dan Wang,Wenchang Wang,Naotoshi Mitsuzaki,Zhidong Chen
Gallium-based liquid metals are considered as promising catalysts for electrochemical CO 2 reduction due to their ability to effectively prevent the adhesion of byproduct carbon, which leads to the deactivation of electrode materials. In order to increase the specific area of liquid alloys, Ga-Sn thin liquid films were electrodeposited from a deep eutectic solvent composed of acetamide and dimethyl sulfone. Electrodeposition of Ga-Sn thin films with varying compositions that follow normal deposition behavior achieved, resulting in Sn rich in overall composition. To obtain Ga-rich thin liquid films, a straight forward and efficient two-step electrodeposition approach was employed. A layer of Ga thin film was firstly electrodeposited on the substrate, followed by electrodepositing a Sn layer. The prepared Ga-Sn thin films were applied for electrochemical reduction of CO 2 in a CO 2 -saturated 0.1 M KHCO 3 solution. Ga-Sn alloy with 91.6 at% Ga was in the liquid state at 25℃ and showed an excellent performance in reduction CO 2 to formate. The Faradaic efficiency reached 80 % and the partial current density was 46 mA cm −2 .
研究领域:
材料科学
·
电化学
·
环境科学
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TRANSITION METAL CHEMISTRY
·
2025
·Vol. 51
·期 1
·6
·
IF 1.7
Ma Xueying,Yu Guomin,Li Yinghua,Li Hui,Wang Hongfang,Jia Xu,Cui Tiebing
To address the challenge of antibiotic residue remediation, this study employed a hydrothermal method to in-situ construct a bimetallic indium/gallium-based MIL-68 heterostructure on the surface of two-dimensional montmorillonite (MMT). By integrating metal node electronic structure regulation with interface engineering strategies, it provides a feasible approach to improve the low charge carrier separation efficiency in metal-organic framework (MOFs) materials. Experimental results demonstrate that when the MMT loading is 20%, the composite material exhibits obvious enhanced photocatalytic performance for the degradation of 40 mg/L tetracycline solution, with a degradation rate of up to 97% within 60 min using 10 mg of catalyst. This improvement is attributed to the synergistic effect of In/Ga bimetals and the interface charge transfer channels of the MMT 2D matrix, which together induce a Z-type charge carrier migration mechanism, enhancing the separation efficiency of photo-induced electron-hole pairs. After four cycles, the MIL-68(In/Ga)/MMT composite showed good cycling stability and demonstrated broad-spectrum degradation capability, achieving degradation rates of 99% and 79% for rhodamine B and methyl orange, respectively. This composite material shows good photocatalytic performance in dye degradation, providing new research insights for the field of photocatalytic degradation of pollutants.
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ANALYTICAL CHEMISTRY
·
2026
·Vol. 98
·期 31
·23301-23313
·
IF 7.3
Liang Shuang,Chen Dongyao,Ma Liming,Feng Xinyi,Gu Dongxue,Yu Kedi,Chen Zhengbo
The
issue of tetracycline (TC) residues in the environment poses
a serious threat to ecosystems and public health, therefore, there
is an urgent need to develop efficient and convenient detection methods.
This study successfully prepared Ga/Zn NC single-atom (SA) nanozymes
with peroxidase-like catalytic activity. Based on the differential
inhibitory effects of different TCs on the Ga/Zn NC SA nanozymes’
catalytic activity, a three-channel colorimetric sensor array is constructed
by regulating the temperature, resulting in differentiated colorimetric
response signals for TCs. Combined with linear discriminant analysis,
the sensor array successfully achieved qualitative differentiation
and quantitative analysis of seven TCs within the range of 1 nM to
100 μM. Further combining the sensor array with machine learning
algorithms such as random forests, accurate identification and prediction
of TCs in blind samples and various actual environmental samples have
been achieved. The sensor array provides a new method for efficient
differentiation and detection of TCs in complex samples, and has good
application prospects in environmental monitoring and food safety
fields.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Shuzhuang Sun,Yanmei Shen,Bocheng Yu,Guanghui Li,Kaitao Hong,Yaozu Wang,Yusheng Qiu,Yu Liu,Hui Zhou
2D-Ga 2 O 3 nanosheets sterically hinder pore entry for targeted Ga distribution. • NiGaSi shows superior activity and drastically reduced carbon deposition. • In-situ DRIFTS identifies carbonyls as key reactive intermediates. • Ga promotes CH 4 activation and inhibits coke formation via isolation effect. Dry reforming of methane (DRM) over Ni-based catalysts suffers from severe coking. We propose a spatially-selective Ga alloying strategy using trace 2D-Ga 2 O 3 to modify external Ni sites. The 2D-Ga 2 O 3 nanosheets, fabricated by air bubbling, are geometrically hindered from entering catalyst pores, enabling targeted surface distribution. After reduction, NiGa alloy forms and dilutes surface Ni ensembles to suppress carbon formation. NiGaSi achieves ∼54% CO 2 and ∼40% CH 4 conversions at 700°C, with only 14.8 wt% coke after 10 h versus 69.8 wt% for NiSi. In-situ DRIFTS identifies carbonyls as reactive intermediates with CH 4 cleavage as the rate-limiting step, while Ga donation promotes CH 4 activation. This morphology-enabled spatial design strategy offers a route for precise catalyst engineering.
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JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Yikun He,Yongheng Fu,Danni Yan,Shuai Yang,Li Zhang,Jiajun Xu,Feifan Song,Xiaokun Zhang,Yuhui Dong,Yousheng Zou
In recent years, Ag-In-Ga-S (AIGS) quantum dots (QDs) have received widespread attention as non-toxic and environmentally friendly QDs. However, the low photoluminescence quantum yield (PLQY) restricts the further application of AIGS QDs in optoelectronic devices. Here, we constructed quinary Ag-In-Zn-Ga-S (AIZGS) QDs with outstandingly high PLQY of 92.1% by doping Zn into AIGS QDs via an economical and environment-friendly hydrothermal method. The synergistic action of the internal doped Zn providing radiative recombination channels and the surface doped Zn passivating the non-radiative recombination defects leads to enhanced PLQY of QDs. The corresponding QDs backlight films fabricated based on AIZGS QDs and polyvinyl alcohol (PVA) also show a high PLQY of 82.7%. The improved PLQY of AIZGS QDs is comparable to other toxic metal-containing QDs in the same spectrum. Furthermore, the PL peak wavelength of the QDs can be tuned from 545 nm to 616 nm by varying the Ag/In ratio. The realization of high PLQY in aqueous AIZGS QDs and its backlight films contributes to the application in the field of eco-friendly backlight display devices.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Feng Long,Bo Zhang,Xincheng Cao,Xiaolei Zhang,Hanjie Ying,Junming Xu,Chenjie Zhu
Herein, we have achieved successful preparation of atomically dispersed catalytic systems, liquid metal Pt x /Ga catalysts, which eliminate the need for reduction processes. Notably, the 0.5 wt% Pt x /Ga catalyst exhibited exceptional stability in hydrogenation performance, achieving 100 % conversion of stearic acid with an impressive 98.7 % selectivity towards octadecane, especially with unprecedented stability over 19 recycling cycles. X-ray absorption spectra (XPS) and density functional theory (DFT) calculations unequivocally establish that isolated Pt atoms, benefitting from charge transfer from the Ga matrix, synergistically optimize Pt metal atom utilization, thereby efficaciously optimizing the d-band center and augmenting hydrogenation proficiency. Furthermore, isolated Pt configuration's weaker CO adsorption ability effectively mitigates concerns of catalyst poisoning and undesirable agglomeration, thereby engendering superior stability. The stronger adsorption with aldehyde and alcohol intermediates promotes the hydrogenation of stearic acid through hydrodehydration pathway, thereby ensuring a high carbon utilization economy. Overall, our work offers insight into the investigation of hydrogenation conversion of bio-derivatives over atomically dispersed catalytic systems.
研究领域:
催化化学
·
材料科学
·
理论计算化学
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 23
·12429-12437
·
IF 14.511
Shuang Li,Yunxiang Hou,Di Li,Bo Zou,Qingtang Zhang,Yang Cao,Guodong Tang
SnSe is considered one of the most intriguing new thermoelectric materials. Polycrystalline SnSe offers a wide range of thermoelectric applications due to its facile synthetic processing and machinability. Herein, we have achieved a high average ZT of 0.8 as well as a high peak ZT of 1.86 in solution-synthesized porous Zn and Ga codoped SnSe nanosheets, generating a maximum energy conversion efficiency of 13.3%. High-density micro/nanopores are induced in the SnSe matrix, which are more effective for scattering phonons and reducing the thermal conductivity. The high density of micro/nanopores, nanosheet structure and dislocations contribute to an ultralow lattice thermal conductivity (0.157 W m−1 K−1 at 873 K). Meanwhile, Ga incorporation can induce band convergence and create resonance levels, producing a large Seebeck coefficient. Ga and Zn codoping contributes to a sharp increase in carrier concentration and an obviously increased electrical conductivity. The enhanced Seebeck coefficient and increased carrier concentration help in achieving a significant enhancement of the power factor over a wide temperature range in the porous Zn and Ga codoped SnSe nanosheets. Consequently, high thermoelectric performance is realized over a wide temperature range via the decoupling of electron–phonon transport in SnSe. This work opens up a great opportunity for designing prospective materials for thermoelectric applications with the aid of the solution synthesis route.
研究领域:
材料科学
·
凝聚态物理
·
纳米科技
·
能源材料
·
半导体物理
·
热电转换
·
无机功能材料
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ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Zhu Ma,Weiya Zhou,Zheng Xiao,Hua Zhang,Zhuoyun Li,Jia Zhuang,Changtao Peng,Yuelong Huang
Planar perovskite solar cells (PSCs) have been demonstrated as a promising architecture for efficient, large-scale, flexible and tandem solar cell. To date, unfortunately, most planar PSCs suffer from current-voltage hysteresis, which derives from interface mismatch, surface defects , ion migration, and ferroelectric property et al. Here, we demonstrate a facile strategy to significantly reduce the hysteresis and improve the performance of planar PSCs by doping gallium (Ga) into tin oxide (SnO 2 ) nanocrystal electron-transport layer using low-temperature solution‐processed method. It is revealed that the Ga-doped SnO 2 ETL owning better band alignment with the perovskite absorption layer , which is helpful for electron extraction. It is found that gallium doping severely decreases the trap state density in SnO 2 , leading to a lower recombination rate and negligible hysteresis. With the optimized doping concentration of Ga ions , the champion device achieves a highest PCE of 18.18% and the hysteresis index is reduced from 23.9% to 1.7%.
研究领域:
光伏技术
·
材料科学
·
纳米技术
·
可再生能源
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JOURNAL OF POROUS MATERIALS
·
2026
·
IF 3.2
Liu Jihua,Hua Ge,Zhang Chao,Wang Yifei,Ma Hong,Wu Jianbing,Wu Zhiwei
Controlled defect construction in zeolites provides an effective approach to modulating metal dispersion and stability. In this work, a series of Zn-loaded Ga-silicalite (GS-1) catalysts were prepared via nitric acid leaching to investigate how Ga extraction–induced silanol nests influence Zn dispersion and catalytic behavior in propane dehydrogenation (PDH). The selective removal of Ga generated increased populations of silanol nests while largely preserving the MFI framework, which was accompanied by improved dispersion and structural stabilization of Zn species, likely through Zn–O–Si interactions. Catalytic evaluation at 550 °C and 0.1 MPa revealed that the acid-treated catalysts exhibited suppressed deactivation behavior under PDH conditions. Among the catalysts studied, 5%Zn/0.6GS-1–12 N catalyst achieved the most balanced performance, with a deactivation constant reduced from 0.0546 to 0.0201 h − 1 . These results highlight the role of Ga extraction–induced defects in regulating metal–support interactions and mitigating catalyst deactivation in PDH.
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Materials
·
2026
·Vol. 19
·期 9
·1685
·
IF 3.7
Runze Zhou,Xinqiang Yuan,Longfei Zhang,Chi Zhang,Hongxing Dong,Long Zhang
Highlights Data-driven framework for fluoride-glass prediction and inverse design. The genetic-algorithm–optimized backpropagation neural network jointly predicts refractive index and density. Bayesian hyperparameter tuning enhances accuracy and robustness. Constraint-aware inverse design ranks feasible compositions by targets & similarity. SHapley Additive exPlanations analysis is employed to quantify feature importance and enhance the interpretability of the model. With the increasing application of novel glass materials in the field of optics, traditional empirical and trial-and-error approaches to glass development are gradually becoming insufficient to meet escalating performance demands. In this study, we propose a neural network-based machine learning method for the design of advanced fluoride glass materials. Predictive models for density and refractive index were first developed based on online fluoride glass datasets. Moreover, SHapley Additive exPlanations (SHAP) analysis was adopted to uncover the quantitative composition-property relationship. Then, the well-trained model was employed for inverse design, identifying specific compositions that fulfill desired properties in terms of density and refractive index. Finally, several recommended compositions were experimentally validated and the measured density and refractive index matched well with the corresponding input values, thereby confirming the effectiveness of the proposed method in designing new fluoride glass materials.
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