Coatings
·
2024
·Vol. 14
·期 2
·164
·
IF 2.9
Wanlei Dai,Zhaoyi Jiang,Yali Sun,Juhua Wang,Zeran Gao,Haoyu Xu,Xinzhan Wang,Chao Gao,Qiang Ma,Yinglong Wang,Wei Yu
In this study, a feasible strategy is proposed for directly depositing high-quality Cu(In,Ga)Se2(CIGS) films using Na-doped targets in a selenium-free atmosphere to boost the power conversion efficiency (PCE) of CIGS solar cells. Introducing a small amount of sodium dopant effectively promoted the textured growth of CIGS crystals in the prepared films, resulting in larger grain sizes and a smoother interface. The higher MoSe2content at the CIGS/Mo interface increased the carrier lifetime in the films. In addition, sodium doping increased the proportion of Se atoms on the film surface and reduced the concentration of defects caused by the direct sputtering of the films in the selenium-free atmosphere. Therefore, the separation and transportation of photo-generated carriers in the devices were effectively enhanced. Using the optimized parameters, a record-high PCE of 17.26% was achieved for the 7.5% Na-doped devices, which represents an improvement of nearly 63%.Keywords:Cu(In,Ga)Se2;sodium-doped targets;magnetron sputtering;solar cells
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Yulan Xu,Minxian Wu,Xianxian Zhang,Wenchang Wang,Naotoshi Mitsuzaki,Zhidong Chen
Electrodeposition is a simple and rapid method for the preparation of thin-film materials, allowing catalytic materials to be directly deposited onto substrates, thereby eliminating the need for binders. Compared with bulk materials, two-dimensional thin films possess a higher specific surface area. The incorporation of Ga in Sn-based alloy materials can effectively expose active sites, thereby enhancing the catalytic performance for CO 2 electroreduction. Doping with rare-earth elements such as cerium can induce the formation of oxygen vacancies and defect sites, or modulate the electronic structure of the catalyst surface. These modifications enable independent regulation of the adsorption energy of various intermediates, effectively lowering reaction energy barriers and improving catalytic efficiency. In this work, Ga-Sn-Ce electrodes were synthesized via electrodeposition in a deep eutectic solvent composed of choline chloride and urea, and subsequently applied to CO 2 reduction. The GaSnCe0.6 electrode exhibited excellent selectivity toward formic acid at −0.99 V vs. the reversible hydrogen electrode, achieving a Faradaic efficiency of 92 %. Compared with previously reported Ga-Sn alloys, the introduction of Ce resulted in a positive shift of 250–270 mV in the optimal reduction potential for formic acid production from CO 2 .
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Materials Today Chemistry
·
2025
·
IF 6.7
Yuan Wang,DouDou Zhang,Hao song,Xiuxia Yang,Zhichao Liu,Yuankang Wang,Jie Yu,Xu Tian
X-ray scintillators are crucial for medical, industrial, and security imaging systems. However, achieving dual-mode of real-time and delayed imaging within a single matrix still faces challenges. Herein, LiGa 5 O 8 : Tb 3+ was successfully synthesized by the high-temperature solid-phase method. By controlling the atmosphere and optimizing the Li + /Ga 3+ ratio, the trap structure of LiGa 5 O 8 : Tb 3+ spinel phosphors is effectively adjusted, which achieved excellent dual-mode imaging. The air-synthesized Li 1.6 Ga 5 O 8 :4 %Tb 3+ exhibits intense X-ray excited persistent luminescence (X-PersL, 595 nm), while the sample of LiGa 5 O 8 :Tb 3+ reduced in H 2 /N 2 shows enhanced radioluminescence (RL) without X-PersL. This precise manipulation of anti-occupancy defects controls the charge trapping/detrapping dynamics, enabling switchable RL (real-time imaging) and X-PersL (delayed imaging) modes through the single Tb 3+ ions emission. The result resolves the incompatibility between prompt and persistent X-ray responses in conventional scintillators. The defect-regulation method establishes a universal strategy for developing scintillators compatible with complex operational demands, advancing high-performance X-ray imaging technologies.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Yiquan Zhan,Shaohui Lai,Junzhe Jiang,Lijiao Zhong,Yongsheng Liu,Kai Yang,Jinbiao Liu,Shiyong Liu,Liqing Li,Yoshihisa Sakata
Strontium titanate (SrTiO 3 ) holds great potential for photocatalytic overall water splitting (OWS) to produce hydrogen. However, the current SrTiO 3 -based photocatalysts require expensive noble metals, such as Pt and Rh. There is an urgent need to explore cost-effective alternatives using non-noble metals. Herein, Cu, Cr, and Co were used as non-noble cocatalyst to modify the surface of Ga˗doped SrTiO 3 photocatalyst (Ga-STO (flux)). The characterization results of XPS and TEM revealed the CuCrO x cocatalysts generated reduced Cu 0 /Cu + species for hydrogen evolution reaction. The inclusion of Cr 2 O 3 aided in maintaining the stability of Cu 0 /Cu + species. The Co 3 O 4 cocatalysts were responsible for the oxygen evolution reaction. Under simulated sunlight, the optimal CuCrO x /Co 3 O 4 /Ga-STO (flux) sample provided the best hydrogen and oxygen production rates of 204.56 μmol·h⁻¹ and 102.28 μmol·h⁻¹ , respectively.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Zhenghang Tian,Yuanyi Liu,Zhiyuan Chen,Zhi Wan,Jizhou Yang,Peilin Zuo,Mingxin Ren,Peng Hu,Feng Teng,Haibo Fan
NiFe layered double hydroxides (NiFe-LDH), as a promising non-precious metal Oxygen Evolution Reaction(OER) catalyst, suffers from the inherent limitations of poor conductivity and insufficient exposure of active sites, coupled with the phenomenon of activity decline at its high current densities, which severely restricts its application in OER. Here, we propose a structurally defective strategy to prepare a self-assembled ultrathin nanosheet structure by introducing Ga3+ ion, and in situ growth of NiFeGa-LDH@NF on nickel foam (NF) to improve its OER performance, and the incorporation of Ga3+ reduces the average thickness of the nanosheets from 4-5 nm to 1-2 nm, which significantly increases the catalyst activity surface area, and further optimized its electronic structure causing the charge transfer resistance a significant decrease. The optimized NiFeGa-LDH@NF provides a high current density of 100 mA cm-2 at an overpotential of 252 mV, which is 43 mV lower than that of the pure NiFe-LDH@NF. Moreover, the voltage changes by only 1.3% after 72 h at a constant current density of 50 mA cm-2, showing its excellent stability. This work presents a new perspective to increase its structural defects by the introduction of transition metal ions and demonstrates the effect on OER performance, providing a new line of thought for the development of higher performance OER electrocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Meile Yue,Kankan Bu,Yahong,Zhang,Wei Shen,Hualong Xu,Zhen Huang
Propane dehydroaromatization (PDA) provides a promising route to produce valuable chemicals such as benzene, toluene and xylene via non-petroleum feedstocks, in which Ga-modified MFI zeolites demonstrate high activity but are susceptible to severe coke deposition. The defect-derived silanols (Si-OH) in zeolite formed during synthesis has emerged as a predominant factor, making the prolongation of the catalyst longevity a major challenge. Here, we developed a gallosilicate MFI zeolite with silanol-defect remediated (Ga-MFI-AHFS) through an ammonium hexafluorosilicate post-treatment, which exhibited an extraordinary activity and stability. Ga-MFI-AHFS exhibits a nearly unchanged propane conversion around 82.0 % with aromatics selectivity around 64.5 % compared to a 25.4 % conversion decline on the raw zeolite with defects exposed during the 20-h CO 2 assisted PDA reaction. The results of FTIR and MAS NMR showed a decreased content of silanol nests as well as the internal Si-OH groups, indicating the successful repair of silicon hydroxyl defects. The restored framework endows the Ga-MFI-AHFS zeolite with an excellent coking resistance, giving a much lower coking-rate of 5.8 × 10 −8 mol C /mol C-in-produced-Aromatics , which is one-sixth of that on Ga-MFI. This work developed a facile route to prepare Ga-MFI zeolite with suppressed silanol-defects, which could help to realize a stable dehydroaromatization of light alkanes.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 13
·7300-7313
·
IF 14.511
Zhao Sun,Junpeng Liu,Rongjun Zhang,Yu Wu,Hongwei Li,Sam Toan,Zhiqiang Sun
Sorption-enhanced steam reforming of methanol (SE-SRM) is a promising approach to creating a high-purity hydrogen supply. However, catalysts suffer from activity deactivation and low CO2 uptake capacity. In this study, we investigate the role of Ga doping of Cu–MgO in SE-SRM by synthesizing a series of MgO embedded xGaCuMg catalytic sorbents via a sol–gel method. The TEM-EDX mapping results indicate that MgO nanoparticles can be successfully embedded in the bulk-phase of the catalytic sorbent with a stabilized microstructure. The results from in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) reveal that the Ga-doped catalytic sorbent is conducive to promoting the conversion of C-containing intermediates in SE-SRM, and absorbing CO2 in the form of bidentate carbonate rather than monodentate carbonate. Experimental studies verify that the best uptake capacity of 18GaCuMg catalytic sorbent (36.25 mg CO2/g MgO) achieves almost complete conversion of methanol (99.70%) with 100% H2 selectivity at 200 °C. Specifically, no CO is formed during the kinetic-control stage of SE-SRM. Density functional theory (DFT) calculations based on the Cu(111)Ga2O3(202)MgO(200) model revealed that the Ga doping can enhance the adsorption energies of methanol and carbon dioxide, promoting methanol activation and increasing CO2 uptake capacity. These findings provide valid strategies for functionalized nanomaterial design, which will substantially promote the SE-SRMR performance with desired catalytic sorbent recyclability.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Zhiping Liang,Run Hao,Hualong Luo,Zhenming He,Liumei Su,Xing Fan
Layered SnSe in nanostructures has recently attracted growing interest in photonics, optoelectronics, photocatalysis, energy storage, and biomedicine because of its suitable band gap, excellent light absorption capacity, and considerable carrier mobility. However, the applications of SnSe in high-performance photoelectrochemical (PEC) devices are greatly hindered due to high-density defects, which lead to its high recombination of charge carriers and environmental instability. In this contribution, we have adopted a doping strategy to enhance the photo-response properties of a SnSe-based PEC photodetector. The as-prepared Ga-doped SnSe nanostructure shows a remarkable increase in photocurrent density, stable on–off cyclicity, fast photo-response behavior, and higher specific detectivity compared to the pristine SnSe. Based on structure characterization, composition analysis, and DFT calculations, the substitution of Sn by Ga in the lattice gives rise to changes in the electronic structure and optical absorption, endowing Ga-doped SnSe with a metal-like feature. Such a doping strategy can provide fundamental support in the development of SnSe-based devices and pave the way for PEC applications.
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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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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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