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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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
·
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
·
固体化学
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高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
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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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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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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THERMOCHIMICA ACTA
·
2023
·
IF 3.5
Yuqi Wang,Linxue Yan,Hua Li,Long Li,Yafei Guo,Tianlong Deng
Microcalorimeter measured the dilution enthalpies of the binary systems (LiBO 2 + H 2 O) and (LiB 5 O 8 + H 2 O) at 308.15 K and 0.1 MPa. Based on the Pitzer theory of electrolytes, their apparent molar enthalpies and the Pitzer single electrolyte parameters at 308.15 K were carried out by fitting the experimental data for the first time. Moreover, the calculated apparent molar enthalpies of LiBO 2 and LiB 5 O 8 aqueous solution according to the Pitzer ion-interaction model were consistent well with the experimental values, manifesting the high reliability of this study.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 39
·15067-15073
·
IF 4.569
Yi Huang,Junben Huang,Yong Zhang
Metal thiophosphates have aroused much research interest due to their structural chemistry and possible applications as infrared functional materials. In this study, five quaternary Sr-based alkali metal thiophosphates ASrPS4 (A = Li, Na, K, Rb, Cs) were obtained. Their structural comparison shows that their symmetry undergoes transformation from tetragonal (I41/acd) to monoclinic (P21/c) to orthorhombic (Pnma) system, which is induced by the cation size effects and coordination features of different alkali metal cations. The experimental and theoretical results demonstrate that the band gaps of all title compounds are large, namely 3.6–3.9 eV (experimental results) and 3.78–4.12 eV (HSE06). Theoretical analyses indicate that the [PS4] group could be regarded as a good unit for designing wide band gap compounds, and the birefringence of NaSrPS4 is 0.08 at the fundemental 1064 nm wavelength, which shows that it may be a potential infrared birefringent material.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yueyue Ma,Mengqi Wu,Ling Li,Zhanyu Li,Xiaohui Zhao,Ruqian Lian,Wenming Zhang
In this work, we synthesized a three-dimensional porous nitrogen-doped carbon composite with a uniform dispersion of MOF-derived Co 9 S 8 nanoparticles (3D Co 9 S 8 @NPC) via a simple template method combining with in situ high temperature pyrolysis. As K-ion battery anode, the 3D Co 9 S 8 @NPC exhibits a high specific capacity of 315 mA h g −1 at 0.1 A g −1 after 200 cycles, as well as a capacity of 223 mA h g −1 at 1 A g −1 after 1000 cycles, which is superior to the performance of KIB metal sulfide-based anode materials reported previously. The excellent performance is attributed to more pore structure and active sites in 3D Co 9 S 8 @NPC, which reduce efficiently K + diffusion length and accelerate the insertion/extraction of K + . The 3D N-doped carbon matrix also speeds up electron transport and buffers the volume expansion of Co 9 S 8 . Moreover, density functional theory (DFT) calculations demonstrate that due to the small energy change of K ion on Co 9 S 8 surface, the 3D Co 9 S 8 @NPC electrode is expected to show ideal rate capability in the K-ion battery system. This work provides ideas to craft other 3D structure anodes towards high-performance metal-ion batteries.
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Advanced Energy Materials
·
2022
·Vol. 12
·期 37
·2201734
·
IF 29.698
Qi Li,Jun Zhang,Lixiang Zhong,Fushan Geng,Ying Tao,Chuannan Geng,Shuzhou Li,Bingwen Hu,Quan-Hong Yang
Hard carbons have been identified as competitive anodes for Li/Na/K-ion batteries but their Li/Na/K-ion storage mechanisms significantly vary in different batteries. It is fundamental to understand the basic science behind the difference. Herein, it is theoretically revealed that defects on the carbon layers generally have an influential impact on the atomic interactions including the metal–metal (M–M) and metal–carbon (M–C) interactions, thereby determining whether the stored alkali-metal atoms are in ionic or quasi-metallic states. Upon increasing the number of metal atoms on a carbon layer composed of only hexatomic rings, K tends to be stored in an ionic state similar to Li due to the dominant M–C interaction, while on a carbon layer with defects, K tends to be stored in a quasi-metallic state similar to Na due to the dominant M–M interaction. For experimental verification, a glassy carbon, the extreme form of hard carbon with dominant sp 2 hybridization and only Stone–Wales defects, is selected as a model anode, and its Li/Na/K-ion storage mechanisms are exactly consistent with the theoretical prediction. More profoundly, for the first time, the quasi-metallic K cluster information is captured by ex situ electron paramagnetic resonance.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 4
·1108-1120
·
IF 6.813
Wenrui Wei,Haoran Lv,Xuehui Wang,Wenzhe Zhang,Zining Sun,Jing Shi,Minghua Huang,Shuai Liu,Zhicheng Shi,Huanlei Wang
Expanding the graphitic interlayer spacing and introducing heteroatoms into the carbon structure are the two key strategies for boosting the potassium storage performance. To fundamentally clarify the relation of graphitic structures and heteroatom-doping in carbon with the potassium storage behavior, carbons with diverse heteroatom-doping levels and microstructures (N,S-CNSs) are produced. It has been recognized that the potassium storage mechanism in N,S-CNSs can be described as an “adsorption–insertion” mechanism: the highly disordered/pseudo-graphitic carbon structure with rich defective sites contributing to a high-potential sloping region by “adsorption” and the graphitic carbon structure contributing to a low-potential plateau region by “insertion”. By tuning the “adsorption” and “insertion” mechanisms, N,S-CNS-1200 with a highly developed graphitic structure can provide a satisfactory reversible specific capacity of ∼300 mA h g−1 at 0.05 A g−1 with a high initial coulombic efficiency of 44.9%, a high “insertion” capacity contribution of 57.9%, and a high capacity retention ratio of 81.9% after 1000 cycles. Moreover, kinetic analysis and ex situ XRD studies show that the kinetic diffusion of K+ in N,S-CNS-1200 is more advantageous. This work clearly clarifies the pivotal role of tuning the heteroatom doping and graphitic structure of carbons for realizing highly accessible graphitic structures for advanced potassium ion batteries.
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Polymers
·
2022
·Vol. 14
·期 3
·406
·
IF 4.967
Xiao Wang,Xianghong Zheng,Xinyu Liu,Birong Zeng,Yiting Xu,Conghui Yuan,Lizong Dai
Due to unique chelating and macrocyclic effects, crown ether compounds exhibit wide application prospects. They could be introduced into amphiphilic copolymers to provide new trigger mode for drug delivery. In this work, new amphiphilic random polymers of poly(lipoic acid-methacrylate-co-poly(ethylene glycol) methyl ether methacrylate-co-N-isopropylacrylamide-co-benzo-18-crown-6-methacrylamide (abbrev. PLENB) containing a crown ether ring and disulphide bond were synthesized via RAFT polymerization. Using the solvent evaporation method, the PLENB micelles were formed and then used to load substances, such as doxorubicin hydrochloride (DOX) and gold nanoparticles. The results showed that PLENB exhibited a variety of lowest critical solution temperature (LCST) in response to the presence of different ions, such as K+, Na+and Mg2+. In particular, the addition of 150 mM K+increased the LCST of PLENB from 31 to 37 °C and induced the release of DOX from the PLENB@DOX assemblies with a release rate of 99.84% within 12 h under 37 °C. However, Na+and Mg2+ions could not initiate the same response. Furthermore, K+ions drove the disassembly of gold aggregates from the PLENB-SH@Au assemblies to achieve the transport of Au NPs, which is helpful to construct a K+-triggered carrier system.Keywords:crown ether;amphiphilic copolymers;K+-triggered;Au NPs;disassembly
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高影响因子
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