ACS Catalysis
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2026
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IF 13.1
Wendong Wang,Xingwen Cha,Longmei Shang,Kang Sun,Fangsong Guo,Jianchun Jiang,Guowu Zhan
This work demonstrates a strategic shift from dynamic electrolyte modulation to static, intrinsic promotion of the CO2 reduction reaction by stably integrating alkali metal cations as a solid-state component within a heterogeneous catalyst. To address the persistent challenge of alkali metal ion leaching due to high aqueous solubility, we immobilize K+ cations into a carbon nitride framework (Ni@K–C3N4) hosting atomically dispersed Ni–N3 sites via an ionothermal strategy. Structural confinement through coordination with nitrogen sites in the C3N4 matrix effectively suppresses K+ leaching, enabling sustained electronic regulation of the Ni centers. Combined experimental and theoretical analyses reveal that K+ incorporation attenuates d-π conjugation, promotes electron localization around Ni sites, and stabilizes low-valent Niδ+ species. This electronic reconfiguration enhances CO2 adsorption and activation while suppressing competitive hydrogen evolution reaction. The optimized Ni@K–C3N4 catalyst achieves a CO Faradaic efficiency of 95% at −0.74 V vs RHE, a current density of ∼20 mA·cm–2, and stable operation over 50 h. Notably, it maintains >80% CO selectivity under a diluted CO2 atmosphere (40%), highlighting its practicality for real low-concentration streams. This work establishes a polymer-functionalization strategy for precise electronic tuning of single-atom catalysis, advancing the design of efficient CO2 utilization systems.
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Small
·
2021
·Vol. 17
·期 45
·2104557
·
IF 13.281
Guolong Wang,Yaling Wang,Boyuan Guan,Jiamei Liu,Yan Zhang,Xiaowei Shi,Cheng Tang,Guohong Li,Yingbo Li,Xiao Wang,Lei Li
MnO 2 -based material is one of the most promising cathode candidates of aqueous zinc-ion batteries (ZIBs), but its commercialization is hindered by the sluggish reaction kinetics and poor structural stability. Herein, a hierarchical framework consisting of core–shell structured carbon nanotubes@K-birnessite-MnO 2 enwrapped by graphene/carbon black bicomponent networks (CNT@KMO@GC) via a simple method for ZIBs is designed and developed. The hierarchical framework characterized with favorable K + preintercalation, δ-phase, and vertically aligned nanoflake arrays of KMO and 3D electrically conductive network shows the enhanced electronic/ionic conductivity and improved wettability with electrolyte, resulting in the fast charge/mass transport and stable structural stability of CNT@KMO@GC. When used as cathode in ZIBs, CNT@KMO@GC exhibits exciting electrochemical performance with remarkable capacity (405.5 mAh g −1 at 0.30 A g −1 ), high rate performance (166.6 mAh g −1 up to 10.0 A g −1 ), and impressive cycling stability (almost no capacity decay after 2000 cycles and 77.3% retention after 10 000 cycles at 10.0 A g −1 ). The energy storage mechanism of CNT@KMO@GC is clarified as H + /Zn 2+ coinsertion/extraction via electrochemical analysis and ex situ characterization. This study offers an innovative paradigm for the advance of ZIBs.
研究领域:
材料科学
·
电化学
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Journal of Environmental Chemical Engineering
·
2022
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IF 7.968
Liangmin Xiong,Shuang Liu,Yong Men,Lin Li,Xiaoda Niu,Kailiang Guo,Junzhe Xu,Wei An,Jinguo Wang,Yu Cong
CO 2 hydrogenation to liquid fuels is significant to reduce CO 2 emissions and replace fossil fuels . Herein, we reported that Fe catalysts promoted by combination of K and Pd showed a three-synergistic catalytic effect to high selectivity of C 5+ hydrocarbons in CO 2 hydrogenation reaction. The catalysts were prepared using an impregnation method and characterized with physical adsorption , XRD , XPS , HRTEM , H 2 -TPR, H 2 -TPD and CO 2 -TPD. The results indicated that K 0.016 Pd 0.12 Fe catalysts showed K-overlapped PdFe-like alloy structure which enhanced H 2 activation behaviors and moderately chemisorption of CO 2 . K addition promoted Fe to activate carbide species while active H originated from H 2 pool generated by PdFe alloy spilled to Fe species surface, consequently boosting not only conversion of CO 2 to 41.8% but also selectivity of C 5+ hydrocarbon to 70.6%. The maximum yield of long-chain C 5+ hydrocarbon reached up to 20.0% under high space velocity 6000 mL g cat −1 h −1 . These results provide a new insight to develop highly selective Fe based catalysts for long-chain hydrocarbons via CO 2 hydrogenation.
研究领域:
化学工程
·
催化反应
·
能源转化
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
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IF 8.3
Shuo Xue,Binghan Li,Dehui Yu,Yingjie Zhao,Dengchao Wang
Aberrant fluctuations in the concentration of cytosolic Potassium ion (K⁺), crucial players in diverse physiological processes, are pathologically implicated in multiple disease states. The real-time monitoring of intracellular K⁺ dynamics thus represents a critical capability for biomedical research. Herein, by integrating Prussian blue (PB) inside the carbon nanopipette (CNP), we developed a nanosized K + -selective electrode that exhibits a broad detection range (10⁻⁵ to 10⁻¹ M) and a low detection limit of 3.38 μM. Moreover, the real-time monitoring of the K⁺ dynamics inside single living cells was also achieved owing to the fast response of the nanoelectrode. The fabricated PB-CNP would provide a novel research tool to monitor K⁺ at the confined spaces, which could find broad applications in the area of fundamental neurobiology, cellular physiology and electrochemistry.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
De Ao,Fujiang Geng,Mao Ye,Shuangjie Yuan,Fanpeng Meng,Jinxiao Bao,Zibo Yang,Zhihua Qiao
The development of high-performance membranes for CO 2 /N 2 separation remains challenging due to the trade-off between permeability and selectivity. A novel strategy has been developed to fabricate K,Na-A zeolite/ZIF-62 crystal-glass composite membranes through a melt-quenching process. The high viscosity of molten ZIF-62 enables the uniform distribution of zeolite particles, preventing their aggregation and sedimentation. The synergistic effect between the highly porous K,Na-A zeolite and the continuous ZIF-62 glass matrix leads to enhanced membrane porosity and efficient gas transport channels. Benefiting from the molecular sieving effect of K,Na-A zeolite and the excellent interfacial compatibility of ZIF-62 glass matrix, the composite membranes demonstrate superior gas separation capability. Systematic investigation revealed that the optimized a g (ZIF-62) 0.7 /(K,Na-A) 0.3 membrane exhibited remarkable CO 2 separation performance with a CO 2 permeability of 58,824 barrer and a CO 2 /N 2 selectivity of 43.1, surpassing the 2019 upper bound. This facile and scalable strategy opens up new opportunities for developing high-performance composite membranes for practical gas separation applications.
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LAND DEGRADATION & DEVELOPMENT
·
2024
·Vol. 35
·期 17
·5137-5148
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IF 3.6
Zhengrong Bao,Wanning Dai,Han Li,Zhengfeng An,Yu Lan,Hang Jing,Jun Meng,Zunqi Liu
Straw biochar is an effective amendment at improving soil aggregate structure and increasing soil carbon and potassium (K) content. However, little information is available on the relationship between soil organic carbon (SOC) and aggregate-associated K distribution under long-term biochar application conditions. To address this, a field trial established in 2013 was used to examine the impact of biochar (B 0 : 0 and B 1 : 2.625 t ha −1 year −1 ) and K fertilizer (K 0 : 0 and K 1 : 60 kg ha −1 year −1 ) on the variation in soil aggregate K and reveal the associated influencing factors. A total of four treatments (B 0 K 0 , B 0 K 1 , B 1 K 0 , and B 1 K 1 ) were included in this study. The soil analysis results obtained in 2021 showed that after 9 years' amendment, B 1 K 1 increased the aggregate exchangeable K (EK) and nonexchangeable K (NEK) pools by 27.40% and 39.55%, respectively, and the increment was primarily because biochar enhanced > 0.25 mm aggregate fractions and strengthened soil K + adsorption capacity, which benefit from a synergistic increase in SOC and humic acid (HA) content by biochar. 13 C NMR analysis showed that long-term biochar applications altered the chemical composition of SOC, with an outcome of increased aromaticity and hydrophobicity but decreased the lipidation of SOC, indicating that the complexity of SOC molecular structure was enhanced and eventually contributed to strengthening the macroaggregates stability and soil K + adsorption capacity. The correlation analysis revealed that soil aggregate EK and NEK contents were positively correlated with SOC and HA contents, which further proved that increase of SOC and soil HA is a significant mechanism for biochar ameliorate soil aggregate-associated K availability.
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AICHE JOURNAL
·
2026
·
IF 4.4
Bingbing Liao,Fei Chen,Lingyu Jia,Shanshan Dang,Weifeng Tu,Zhenzhou Zhang,Yifan Han
Direct conversion of CO 2 toward isomerized heavy olefins remains a challenge. In this work, Fischer-Tropsch synthesis and light olefins oligomerization were coupled to produce isomerized heavy olefins from CO 2 hydrogenation on a bifunctional K/Fe 2 N- x M/ASA catalyst. A K/Fe 2 N-17.0%Ga/ASA achieved the highest selectivity (47.7%) toward C 4+ heavy olefins, among which the selectivity of isomerized olefins was as high as 32.2%. Ga species did not adsorb light olefins (e.g., ethylene) directly, but they boosted the adsorption of light olefins on ASA support. Besides, the addition of Ga promoted H 2 dissociation to generate Ga-H species, which further transferred onto ASA support to form additional Brønsted acid sites promoting oligomerization reaction that obeyed β-H elimination mechanism via alkoxide intermediates. This work developed not only a unique K/Fe 2 N as Fischer-Tropsch synthesis catalyst, but also an integrated system coupling Fischer-Tropsch synthesis and light olefins oligomerization to achieve high selectivity isomerized heavy olefins synthesis from CO 2 hydrogenation.
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MATERIALS LETTERS
·
2022
·
IF 3.574
Shuimiao Xia,Zhicheng Shi,Liang Sun,Shengbiao Sun,Davoud Dastan,Runhua Fan
High dielectric materials are widely used in electronic devices, but their applications are severely hindered by the high loss and low breakdown strength. Herein, a layered structure is designed to effectively suppress the loss and enhance the breakdown strength of high dielectric materials. In the design, the high dielectric films are stacked with linear dielectric films, which can not only form breakdown barriers between adjacent layers but also reduce the leakage conduction loss. As a result, an obvious suppression of loss from 0.13 to 0.05 at 100 Hz, along with a significant increase of breakdown strength from 138 kV/mm to 413 kV/mm, are successfully achieved.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Lehui Tu,Yunlong Shi,Chunying Zhu,Taotao Fu,Xiqun Gao,Youguang Ma
Densities and viscosities of sugar alcohols (meso-erythritol, xylitol, and d-sorbitol) in glycylglycine–water mixtures were measured at T = (293.15, 303.15, 313.15, 323.15, and 333.15) K under atmospheric pressure. Furthermore, the apparent molar volume, the limiting partial molar volume, the limiting partial molar volume of transfer, the viscosity B coefficient, and the free energies of activation per mole of solvent and solute were obtained through the experimental data. Moreover, the limiting partial molar volume of transfer was analyzed based on the co-sphere overlap model, and the transition-state theory was applied to determine the active free energies. The results indicate that the ion–hydrophilic interaction between the sugar alcohols and glycylglycine molecules occupies a dominant position in the solution, d-sorbitol tends to act as a structural breaker in the glycylglycine–water mixtures, and meso-erythritol and xylitol tend to act as structural makers in the glycylglycine–water mixtures.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Qijiu Deng,Runrun Wang,Bo Gou,Zhiyun Zhao,Zhaohui Yang,Jilin Li,Yiming Zou,Rong Yang
Organic potassium terephthalate (K 2 TP) shows promising applications as an anode material in potassium-ion (K-ion) batteries with flexible crystal structure, suitable work potential, stable capability in organic electrolyte and environmentally friendly. Nevertheless, the inherent poor electronic conductivity has been the bottleneck to construct high-performance organic K-ion batteries. Herein, we initially report a flexible and conductive carbon coating layer on organic K 2 TP and reduced graphene oxide composite via electrospinning methodology and controlling medium–low temperature heat treatment (denoted as K 2 TP/rGO/C). The as-synthesized K 2 TP/rGO/C composite displays impressive cycle stability with a reversible specific capacity of 86 mAh g −1 at 200 mA g −1 after 500 cycles with an average capacity decay rate of only 0.1 % per cycle. It is demonstrated that the flexible conductive carbon coating layer and the continuous conductive network structure can significantly improve the electronic conductivity of organic K 2 TP, and reduce the interface transfer resistance. The rational construction of organic composite can offer a guideline for high-performance organic K-ion batteries.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Mai Han,Yuanyuan Han,Houchun Yan,Huanhuan Gui,Weizhen Sun,Qingsong Li
2,2,2-trifluoroethanol (TFE) is used more and more widely in industry, but there are few reports on its separation at present. The purpose of this work is to explore the feasibility of separating 2,2,2-trifluoroethanol from aqueous solution using different extractants, as isopentanol, 2-Ethyl-1-hexanol, n-Propyl acetate, and dichloromethane. The liquid–liquid equilibrium data of TFE + water +{isopentanol or 2-ethyl-1-hexanol or n-propyl acetate or dichloromethane} at standard pressure and 303.2 K were measured. The estimated partition coefficient ( D ) and separation factor ( S ) of TFE are higher than 1. Meanwhile, Othmer-Tobias and Hand's empirical equations verified the experimental data's consistency, and the squares of its linear correlation are all greater than 0.99. The NRTL and UNIQUAC activity coefficient models were used to correlate the experimental data, and different model parameters were obtained by regression. After comparing the calculated values of the model with the experimental data, it was found that the root means square deviation ( RMSD% ) was less than 0.34%, which indicate that both models have a reasonable correlation with the experimental data of the ternary system and can accurately predict the experimental data.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Umarbek Alimov,Kaiyu Zhao,Jiayin Hu,Yafei Guo,Lingzong Meng,Xiuyun Pan,Tianlong Deng
The purpose of this exploration was to determine the density and volumetric properties of the aqueous solution of Na 2 H 2 P 2 O 7 with the molality varied from 0.08706 to 0.88402 mol·kg −1 measured at temperature intervals of 5 K from 283.15 to 363.15 K at 101.325 kPa using Anton Paar Digital vibrating-tube densimeter. The thermal expansion coefficient ( α ), apparent molar volume ( V Φ ), expansibility ( ϕ E ), and partial molar volume ( V B ) of Na 2 H 2 P 2 O 7 (aq) against temperature and molality have been evaluated from density data. On the basis of Pitzer ion-interaction apparent molar volume theory, the Pitzer single-salt parameters ( β M , X 0 v , β M , X 1 v , β M , X 2 v and C M , X v , MX = Na 2 H 2 P 2 O 7 ), and their correlation coefficients a i of the temperature-dependence formula f ( i , p , T ) = a 1 + a 2 ln( T /298.15) + a 3 ( T − 298.15) + a 4 /(620 – T ) + a 5 /( T − 227) for Na 2 H 2 P 2 O 7 were obtained for the first time. It was revealed that predicted apparent molar volumes agreed well with the experimental values indicating the single salt parameters and the temperature-dependent formula are reliable.
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