EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2020
·Vol. 2020
·期 42
·4007-4014
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IF 2.529
Lu Qi,Zhaohui Chen,Lu Li,Qun Jing,Na Li,Zhongqi Jiang,Xiaoyu Dong,Ming-Hsien Lee
Two homologous new mixed-metal phosphates K 2 PbBi 2 (PO 4 ) 2 (P 2 O 7 ) ( I ) and Rb 2 CdBi 2 (PO 4 ) 2 (P 2 O 7 ) ( II ) were successfully synthesized in A 2 BBi 2 (PO 4 ) 2 (P 2 O 7 ) (A = K, Rb, B = Pb, Cd) system through the traditional high-temperature solid-phase method. The single crystal structures of the two compounds are shown to be the unique three-dimensional (3D) framework composed of different types of layers, but not isomorphic. We compared series compounds A 2 PbBi 2 (PO 4 ) 2 (P 2 O 7 ) (A = K, Rb, Cs), which are isomorphic and crystallize in the same space group Pnma . It is noteworthy that they are distinct different in degree of structural disorder, which is tuned by A-site cations. The effect of A-site cations is recognized by analyzing the disorder degree in three related structures and other available 182 mixed-metal phosphates. To the best of our knowledge, such structural analysis is rarely reported in inorganic phosphates and the cation modulation strategy can be used to guide structural disorder according to the difference-value (D-value) of cation radii. Furthermore, the syntheses, thermal analysis, relevant spectroscopic measurements and theoretical calculations for I and II compounds were also discussed. Graphical Two new mixed-metal phosphates K 2 PbBi 2 (PO 4 ) 2 (P 2 O 7 ) and Rb 2 CdBi 2 (PO 4 ) 2 (P 2 O 7 ) were firstly reported and the cation size effect has substantial influence on the crystal structural disorder combining with the title compounds and 182 phosphates.
研究领域:
无机化学
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材料科学
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晶体学
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固态化学
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
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IF 3.141
Junhui Liu,Anfeng Zhang,Xiao Jiang,Min Liu,Jie Zhu,Chunshan Song,Xinwen Guo
Conversion of CO2 by hydrogenation into higher hydrocarbons has attracted much attention due to the continuous increasing concentration of CO2 in the atmosphere. Fe5C2 was used as the active site and mixed with K-modified supports for CO2 hydrogenation to synthesize value-added hydrocarbons. A series of supports were tested, and the alkaline Al2O3 was the best choice for light olefins and C5+ hydrocarbons. The transformation of product selectivity at time on stream demonstrated that potassium migrated into Fe5C2 during reaction. The selectivity of C2+ is 69.2% containing 35.8% C2–C4= and 29.1% C5+ value-added hydrocarbons with the 31.5% CO2 conversion (H2/CO2 = 3). When the ratio of H2 and CO2 was switched to 4, CO2 conversion improved to 40.9%, and the C2+ selectivity to 73.5%, containing 37.3% C2–C4= and 31.1% C5+ value-added hydrocarbons. The mixture catalysts can be directly used without any reduction before reaction, reducing the consumption H2 and simplifying the operation.
研究领域:
催化化学
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能源化学
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环境科学
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材料化学
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工业催化
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Yuting Lin,Yuran Li,Shining Wang,Jianshan Wang,Yanbin Cui,Tingyu Zhu
Blast furnace gas as a vital secondary energy in iron and steel industry, necessitates efficient removal of carbonyl sulfide (COS) to realize clean high-value utilization. However, conventional Al 2 O 3 catalysts suffer from low hydrolytic activity and poor sulfur resistance, limiting their industrial application. This work systematically elucidates the mechanisms of K coordination and hierarchical pore on COS hydrolysis. EXAFS and DFT reveal that appropriate K doping induces highly dispersed K species with four-coordinated K species featuring K-O-Al bonds, which increase the electron cloud density of O atom in surface hydroxyl groups (-OH) and significantly enhance the COS conversion by over 50%. For hierarchical pore catalysts, the introduction of expanding agent breaks the dense stacking of alumina particles, exposes more Al atoms and increases [AlO 6 ] coordination content, which synergistically enriches active -OH sites. More importantly, the interconnected hierarchical porous channels accelerate gaseous H 2 S desorption and effectively mitigate surface sulfur deposition, enabling the catalysts to maintain over 90% COS conversion for 8 h. This work provides atomic-level insights into K coordination and hierarchical pore, offering a rational strategy for designing high-efficiency and sulfur-resistant COS hydrolysis catalysts for blast furnace gas purification.
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Materialia
·
2026
·
IF 3.1
Fengyun Liu,Jialiang Zhang,Lu Li
(K,Na)NbO₃-based ceramics are widely regarded as a promising type of lead-free piezoelectric materials to replace the current lead-containing ones. However, due to polymorphic phase transitions, achieving a desirable comprehensive piezoelectric performance of high piezoelectric coefficient d ₃₃ and large electromechanical coupling factors k p , k t and k 33 along with good thermal stabilities (which are characterized by minimal temperature dependence and ageing degradation) in them is extremely challenging. The poled and subsequently thermally-stabilized <001>-textured 0.98(K₀.₄₈Na₀.₅₂)₀.₉₉Li₀.₀₁(Nb₀.₉₈Sb₀.₀₂)O₃–0.02(Bi₀.₅₀Na₀.₅₀)ZrO₃ ceramic was recently identified as an effective solution to the issue. It possesses a d ₃₃ of 405 pC/N along with k ₚ ≈ 0.80, k ₜ ≈ 0.60, k ₃₃ ≈ 0.88 at room temperature, and its piezoelectric properties are of weak temperature dependence across a broad operational range and show remarkable retention even after thermal ageing at 250 °C. Particularly, its d ₃₃ has an average of 425 pC/N with the variation ≤ ± 6.5% from room temperature to 100 °C, and its k ₜ keeps almost constant between -60 °C and 110 °C. In general, this ceramic exhibits an outstanding comprehensive performance that well competes to those of benchmark commercial piezoceramics such as PZT-5A and PZT-5H, indicating the great potential for advanced ultrasonic applications. Analysis reveals that the excellent piezoelectric properties originate from the synergistic effect of crystallographic anisotropy and an engineered, dense domain structure of orthorhombic phase. Meanwhile, the remarkable thermal ageing stability is possibly attributed to the relaxed crystal structure and the stabilized domain structure, both facilitated by the repeated orthorhombic-tetragonal phase transitions in the thermal treatment.
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Nanoscale
·
2026
·
IF 5.2
Dan Zhang,Lu Zhang,Xiaodong Ma,Zhiyuan Chen,Tinggang Ma,Ye Wang,Wenxiang Tang
Carbon nitride (CN), a promising polymeric semiconductor and photocatalyst, exhibits photocatalytic activity that is notably influenced by the synthesis temperature. In this work, a series of I, K co-doped carbon nitrides (KICNT) were fabricated under various pyrolysis temperature (450, 500, 550, 600 and 650 °C) conditions and an N2 atmosphere, which were then subsequently applied to catalytic hydrogen peroxide (H2O2) production and tetracycline (TC) degradation. Both oxygen adsorption capacity and photocatalytic activity exhibited an initial increase followed by a decline with rising pyrolysis temperature. The KICN600 sample simultaneously exhibits the highest photocatalytic activity for both H2O2 production and photodegradation capability for TC. KICN600 achieved a H2O2 yield of 4382.1 μmol L−1 via a two-step oxygen reduction process in air after 2 h and 11 013.8 μmol L−1 under an oxygen atmosphere and visible light irradiation. Furthermore, the TC degradation over this state-of-the-art KICN600 photocatalyst can reach 83.9% within only 2 h under ambient air conditions. The characterizations results showed that the exceptional photocatalytic activity of KICN600 can be attributed to the high concentration of K-bridged channels and abundant carbon vacancies. These structural features collectively enhance the oxygen reduction capability and charge carrier separation efficiency.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xiaoxiao Zheng,Jiaming Wang,Peipei Lei,Qihong Xue,Xian Kan,Jiangang Chen
An enhanced Cu + /Cu 0 catalytic structure via the electronic effect of K was fabricated; • The proper amount of K could regulate the ratio of Cu + /Cu 0 and promote Cu dispersion; • Both the enhanced Cu + /Cu 0 ratio and the smaller Cu size promote the generation of MG; • The increased basic sites by the K doping remarkably increase the ethers by-products; • The deactivation was caused by the boosted Cu + ratio and the coated active sites by K. In this work, the CuZr 2 catalysts with significantly enhanced Cu + /Cu 0 catalytic active structures via the electronic effect of K were synthesized by the means of citrate complexation and used for dimethyl oxalate (DMO) hydrogenation to methyl glycolate (MG). The CuZr 2 –1.0 K sample exhibited the most outstanding performance, achieving a DMO conversion of 93.4% and MG selectivity of 85.8%. And the role of K in Cu-based catalysts for DMO hydrogenation is universal. The reduction of the catalyst was inhibited after potassium addition, lowering the Cu 0 content, thus leading to a decrease in the H 2 adsorption capacity of the catalyst, and accordingly, its activity decreased. The results showed that the ratio of Cu + /Cu 0 increased after K doping, and the adsorption strength of the catalyst for H 2 was weakened, which inhibited the deep hydrogenation of DMO. Simultaneously, the smaller size of metallic Cu via the appropriate amount of K doping facilitated the desorption of MG. Therefore, the selectivity for the target product MG was remarkably improved. However, the basic sites on the catalyst surface could increase after K doping, which would lead to an increase in the ether by-products. As the reaction proceeded, the ability of the catalyst to adsorb and activate H 2 was diminished due to the significantly increased surface K content and Cu + ratio, leading to the deactivation of the K-doped catalyst. This study provides a potential pathway for alkali metals to regulate the electronic structure of Cu-based catalysts and apply them to the hydrogenation of DMO to MG. Download: Download high-res image (258KB) Download: Download full-size image
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SOLID STATE SCIENCES
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2023
·
IF 3.5
Ningxia Li,Qi Luo,Meiyan Cui,Zhiying Zhao,Zhangzhen He
New fluorophosphate compounds H A 5 M 6 (OH) 4 F 4 (HPO 4 ) 8 ( A = K, Rb; M = Fe, Ga) were synthesized by a fluorine-rich hydrothermal method . These compounds crystallize in the monoclinic system with a P2 1 /n space group, exhibiting an open framework structure built by [PO 3 (OH)] groups, [MO 4 (OH)F], and [MO 4 F 2 ] octahedra, where ten-membered-ring channels, eight-membered-ring channels, six-membered-ring channels, and the linear M 3+ trimers are seen. The characterizations were carried out by powder XRD , EDS , FT-IR spectra, and magnetic measurements. The results confirmed that H A 5 Fe 6 (OH) 4 F 4 (HPO 4 ) 8 ( A = K, Rb) show a quite similar magnetic behavior, possessing an antiferromagnetic ordering at 14.7 K and 15.6 K, respectively. The changes of the magnetic entropy for such antiferromagnetic orderings can be estimated as ∼10.7 J mol −1 K −1 and ∼13.4 J mol −1 K −1 .
研究领域:
无机化学
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材料科学
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固体化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
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IF 7.3
Ya Chu,Weiqiang Zhang,Baoye Hu,Jinghong Wen,Mengmei Qin,Guangjiu Zhao
Regulation of surface ligands in hybrid organic–inorganic perovskite quantum dots (HOIP QDs) is key to enhancing their optoelectronic properties. However, achieving both high photoluminescence (PL) and long-term stability in chiral HOIP QDs remains challenging. Here, we report the use of chiral anthraquinone derivatives (AQ) as surface ligands, replacing conventional long-chain alkyl ligands, to construct two potassium-doped chiral QDs, (R)AQ-QDs and (S)AQ-QDs. These QDs exhibit high photoluminescence quantum yields (PLQYs) of 98.74 and 97.68%, respectively, along with notable stability. Optical characterization indicates an efficient chirality transfer from the organic ligands to the K0.23MA0.77PbBr3 lattice. Furthermore, density functional theory (DFT) calculations and femtosecond transient absorption (fs-TA) spectroscopy reveal reduced surface trap states, as evidenced by stronger ligand binding and prolonged carrier lifetimes. A white-light-emitting diode (LED) fabricated using the AQ-QDs shows a color rendering index (CRI) of 65.1 and a correlated color temperature (CCT) of 6169 K. The reported work highlights the potential of chiral ligand engineering in improving PL efficiency and stability in perovskite QDs.
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2025
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IF 3.6
Yu Jiang,Maohua Wang,Long Chen,Yang Luo,Yuebin Xu,Qingling Wang,Aierken Sidike
Conventional white light-emitting diodes (WLEDs) have a cyan gap in their emission spectra, which limits their colour rendering index (CRI) and spectral continuity and thus restricts their practical potential. Here, a series of cyan-emitting Sr 0.7-x K x Al 2 Si 2 O 8 :0.3Eu 2+ (x = 0–0.35) phosphors were synthesized via a high-temperature solid-state reaction. By substituting heterovalent K + , we redshifted the emission peak and engineered the bandgap, effectively suppressing nonradiative transitions. As a result, the emission intensity at 423 K is increased from 35 % to 83 % of the room-temperature value, and the internal quantum efficiency reaches 62 %. When the optimized phosphor is combined with a near-UV chip and commercial red phosphor, a WLED with Ra = 92 and CCT = 4673 K is achieved. This strategy not only fills the gap in the cyan spectrum but also simplifies the device fabrication process, demonstrating the great promise of the present phosphor for next-generation full-visible-spectrum WLED lighting.
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产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·9977
·
IF 15.7
Qin Feiyu,Bai Xiaoya,Fang Yue-Wen,Zhu Pengli,Wang Jun,Cheng Pengtao,Wang Dunhui,Hu Lei,Sun Jun,Ding Xiangdong
Giant negative thermal expansion (NTE), defined by volumetric expansion α V
研究领域:
材料科学
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凝聚态物理
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无机化学
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热膨胀材料
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晶体学
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产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2019
·
IF 2.251
Fei Yuan,Long Li,Yafei Guo,Tianlong Deng
The dilution enthalpies of LiBO 2 (aq) from 0.0398 to 0.7684 mol·kg −1 and LiB 5 O 8 (aq) from 0.0521 to 0.8067 mol·kg −1 at 298.15 K and 101.325 kPa were investigated using the microcalorimeter BT 2.15. The apparent molar enthalpies on two lithium borates were obtained, and the diagrams of their apparent molar enthalpy against molality for LiBO 2 (aq) and LiB 5 O 8 (aq) were also plotted. Considering the constructers of BO 2 - and B 5 O 8 - in aqueous solution are existed as in [B(OH) 4 ]- and [B 5 O 6 (OH) 4 ]-, the Pitzer single-salt parameters ( β M X ( 0 ) L , β M X ( 1 ) L , β M X ( 2 ) L , C M X L ) for LiB(OH) 4 and LiB 5 O 6 (OH) 4 were obtained for the first time. A comparison between the calculated apparent molar enthalpies for LiBO 2 (aq) and LiB 5 O 8 (aq) based on Pitzer model and those determined experimentally agree well, which indicate that the Pitzer single parameters of LiB(OH) 4 and LiB 5 O 6 (OH) 4 obtained are reliable.
研究领域:
物理化学
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热化学
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溶液化学
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DOI
高影响因子
Frontiers in Energy Research
·
2023
·
IF 3.4
Huang Jiamin,Zhang Guanghui,Wang Mingrui,Zhu Jie,Ding Fanshu,Song Chunshan,Guo Xinwen
The catalytic production of higher alcohols (HAs) is a promising path for converting CO2 into value-added chemical products. The application is still limited by the low selectivity of HAs (less than 10%) on most catalysts. Here, we report a tandem catalyst consisting of Mn-Cu-K modified iron carbide and CuZnAlZr catalyst. The modification of iron carbide with Mn, Cu and K promoters improves the formation of HAs (13.5% Sel.), and the construction of tandem catalysts with CuZnAlZr can further enhance the catalytic performance. By examining different catalyst filling methods and the filling ratio of the tandem catalyst, it was found that the powder mixing resulted in a higher selectivity of HAs with a mass ratio of the two components of 1:1, and a synergistic effect leads to a higher selectivity of HAs (15.5%) with about 40% of propanol and butanol among HAs.
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产品关联
DOI
高影响因子
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