JOURNAL OF POWER SOURCES
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2017
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IF 6.395
Li-Yuan Zhang,Meng-Ran Wang,Yan-Qing Lai,Xiao-Yan Li
N-doped microporous carbon as an exceptional metal-free catalyst from waste biomass ( banana peel as representative ) was obtained via fast catalysis carbonization , followed by N-doping modification. The method achieves a relatively high C conversion efficiency of ∼41.9%. The final carbon materials are doped by N (∼3 at.%) and possess high surface area (∼1097 m 2 g −1 ) and abundant micropores . Compared to commercial Pt/C materials, the as-prepared carbon catalyst exhibits a comparable electrocatalytic activity and much better stability. Furthermore, the metal-free catalyst loaded Zn-air battery possesses higher discharge voltage and power density as compared with that of commercial Pt/C. This novel technique can also be readily applied to produce metal-free carbon catalysts from other typical waste biomass (e.g., orange peel, leaves) as the carbon sources. The method can be developed as a potentially general and effective industrial route to transform waste biomass into high value-added microporous carbon with superior functionalities.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Yangyang Bian,Yi Qiu,Jianfeng Zhang,Qiyu Meng,Li Wang,Shan Ni,Huizhou Liu,Liangrong Yang
The development of highly efficient adsorbents for the capture of 133 Cs and the removal of radioactive isotope 137 Cs from complex aqueous solutions is crucial for the chemical production and environmental remediation. Herein, Mo-based crystalline adsorbent with sub-nanometer (5.76 Å) channels was successfully prepared and used in electrochemically controlled Cs + separation process. Crystalline structures of MoIC (HNO 3 ) before and after adsorption of Cs + were clearly elucidated using powder X-ray diffractometer (PXRD). A more environmentally friendly electrochemical method was employed to achieve easy release and recapture of Cs + . Adsorption comparison experiments revealed that our material clearly outperforms the reported adsorbents for the removal or recovery of trace amount of Cs + (< 10 mg L −1 ). Furthermore, MoIC (HNO 3 ) also exhibited excellent selectivity for low concentration of Cs + over highly excess of competitive cations, such as Mg 2+ , Ca 2+ and K + , which are commonly distributed in brines. The maximum separation factors of Cs + /Mg 2+ , Cs + /Ca 2+ and Cs + /K + are 1.2 × 10 5 , 1.3 × 10 4 and 66, respectively. The remarkable selectivity can be attributed to the outstanding ion-sieving ability of sub-nanometer channels based on the differences in ionic radius and hydration energy of these cations. A real brine was introduced to further prove that one complete cycle of electrochemical adsorption and desorption can dramatically reduce the competing ions concentrations up to 980 times. We anticipate that our findings may give the prospect of opening up new path for the efficient separation of Cs + from brines using molybdenum-based adsorbent via electrochemically controlled process as a green and sustainable way.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2024
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IF 3.7
Qiannan Wang,Aaron S. Pittman,Yan Cao
Red mud (RM) is a solid waste generated in the aluminum industry after the extraction of alumina oxide; its multiple elements and higher pH value likely pose a severe threat to the environment after treatment. However, RM's higher concentrations of metal components, particularly Fe 2 O 3 and rare earth elements (REEs), render RM promising for catalytic application. Hence, this work showed an efficient high-speed RM to catalyze electrocatalytic nitrate-to-ammonia reduction reaction (NARR). RM calcined at 500 °C (RM-500) exhibited excellent catalytic performance. Faradaic efficiency of ammonia ( FE NH 3 ) in an electrolyte solution containing 1 mol⋅L − 1 NO 3 − achieved a maximum value of 92.3% at −0.8 V ( vs . RHE). Additionally, 24-h cycle testing and post-reaction PXRD and SEM indicated that the RM-500 electrocatalyst is stable during NARR. The RM-500 demonstrated a high FE of NH 3 -to-NO 3 − of 89.7% at 1.85 V ( vs . RHE), showing great potential in the ammonia fuel cells technology and achieving the nitrogen cycle.
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APPLIED OPTICS
·
2025
·Vol. 64
·期 10
·2554-2560
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IF 1.7
Xiaodong Zhang,Kang Xiang,Muyang Ye,Shuang Gao,Xiujuan Wang
Ultraviolet photodetectors (UV-PDs) with high sensitivity and fast optical response have become an important part of modern optoelectronic information transmission and communication systems. In this paper, a high-performance self-powered titanium carbide (${{\rm Ti}_{3}}{\rm C_2}{\rm T_x}$)/gallium nitride (GaN) Schottky UV-PD with an interdigitated electrode was developed. A Schottky-contacted ${{\rm Ti}_{3}}{\rm C_2}{\rm T_x}$ interdigitated electrode was successfully fabricated on GaN substrates using a spray coating method. The as-prepared ${{\rm Ti}_{3}}{\rm C_2}{\rm T_x}/{\rm GaN}$ UV-PD exhibits excellent optoelectronic properties. Under zero bias and weak UV illumination (${48}\;\unicode{x00B5} {{\rm W/cm}^{2}}$), the device demonstrates an ultra-low dark current (${2.818} \times {{10}^{- {10}}}\;{\rm A}$) and a fast response speed (${{\rm t}_{\rm r}} = {170}\;\unicode{x00B5} {{\rm s/t}_{\rm f}} = {210}\;\unicode{x00B5} {\rm s}$); the responsivity and detectivity could reach 120.78 mA/W and ${1.272} \times {{10}^{{12}}}$ Jones, respectively. Furthermore, to demonstrate the feasibility of practical application, the device was applied in a UV point-of-view imaging system and high-quality images were successfully obtained under low-light conditions. This work presents an effective approach in developing high-performance UV-PDs for optical imaging applications.
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ACS Applied Materials & Interfaces
·
2025
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IF 8.2
Zihan Zhong,Qingqing Shao,Baoxin Ni,Dazhi Wang,Zixi Xie,Libang Xu,Yakui Mu,Qisen Wang,Tan Wang,Yiwen Feng,Jingwei Hou,Kun Jiang,Anthony K. Cheetham,Tiesheng Wang
Controlling the nanostructure of conducting polymers (CPs) is essential for enhancing their performance in energy storage applications. Existing CPs often suffer from low effective pseudocapacitance due to poor ion permeability. In this study, we introduce a novel approach using hydrogen-bonded organic frameworks (HOFs) to synthesize porous poly(3,4-ethylenedioxythiophene) (PEDOT). We incorporated 3,4-ethylenedioxythiophene (EDOT) into HOF-16 by leveraging the flexible hydrogen-bonding interactions. Following the polymerization of EDOT, the HOF-16 was removed to form a porous interconnected network of PEDOT. Electrochemical evaluations demonstrated that the porous PEDOT exhibited significantly enhanced performance, including high specific capacitance, excellent rate capability, and ∼95% capacitance retention after 10,000 cycles. Compared to PEDOT prepared without HOF, the porous PEDOT showed a 34% increase in specific capacitance and a 10% improvement in 10,000-cycle capacitance retention. This work highlights the potential of HOF-enabled synthesis in creating high performance conducting polymers, offering a new avenue to improve supercapacitor performance, particularly in capacitance and cycling stability.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Meifang Cao,Yuqiao Ma,Tao Ruan,Lifeng Li,Bo Chen,Xueqing Qiu,Di Fan,Xinping Ouyang
The cleavage of C-O bonds in lignin depolymerization was made great progress, but the cleavage of C-C bonds still face challenges. An atomically dispersed Pt loading of 3.30 wt% catalyst, Pt/Nb 2 WO 8 , was prepared by the pyrolysis of ammonium niobate oxalate and sodium tungstate dihydrate with ammonium carbonate as the template. It is found that the decomposition of ammonium carbonate and the doping of W species promoted the orderly growth of niobium tungsten oxide crystals with oxygen vacancy and the formation of a regular porous structure, which was conducive to the dispersion of Pt particles. Pt/Nb 2 WO 8 efficiently cleaved β-O-4, β-1, α-1 and 5–5 bonds. The yield of aromatic monomers for lignin depolymerization reached as high as 49.08% over Pt/Nb 2 WO 8 . Experiments combined with density functional theory calculations revealed that the excellent activity of the Pt/Nb 2 WO 8 catalyst was attributed to the cooperation of atomically dispersed Pt sites and support near the interface. The atomically dispersed Pt species enhanced the dissociation of H 2 , and the Nb 2 WO 8 support with abundant B acid sites provided by W doping and oxygen vacancies activated C-O and C-C bonds of lignin in the reaction. The homogeneous cleavage of C-C bonds dominated the deconstruction of β-1, α-1 and 5–5 bonds. This methodology opens up a facile strategy for the design of atomically dispersed Pt/Nb 2 WO 8 catalyst with higher Pt loading and excellent catalytic activity to the cleavage of both C-O and C-C bonds in lignin.
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Journal of Physical Chemistry C
·
2024
·
IF 3.3
Jihua Li,Weijia Chen,Jinfeng Zhou,Yongpan Tian,Huan Liu,Shiwei He
In the electrolysis of copper foil, the addition of trace additives can adjust the kinetic parameters of the copper electrochemical process to control the crystal orientation. This is of great significance for the production of ultrathin copper foil and its application in lithium-ion batteries. The reaction rate constant and diffusion coefficient determine the rate of the electrochemical and mass transfer processes around the electrode–electrolyte interface. In this study, the influences of gelatin on the kinetic parameters of copper electrodeposition were fully investigated. An electrochemical study found that gelatin could make the copper deposit more difficult to dissolve and that an increase in gelatin concentration would reduce the charge transfer rate of the Cu2+ → Cu reaction. An RDE study found that the addition of gelatin reduced the reaction rate constant of the Cu2+ → Cu reaction and increased the diffusion coefficient of Cu2+ in the electrolyte. Increasing the gelatin concentration from 0.002 to 0.02 g/L was beneficial to the grain refinement of the deposited layer. After the addition of gelatin, the copper deposit layer grew preferentially on the (111) crystal plane.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Yunchang Fan,Qiang Zhou,Sheli Zhang,Yanhe Nie
Thiosulfate has been considered as a more environmentally-friendly alternative to cyanide salts for the extraction of gold from gold ores and the development of affordable, green and efficient adsorbents for the isolation of gold-thiosulfate complex (Au(S 2 O 3 ) 2 3− ) from the leaching solution remains a significant challenge. To address this issue, chitosan, a natural macromolecule , was selected as a carrier and chemically modified with ionic liquids . The ionic liquids modified chitosan showed greater adsorption capacity towards Au(S 2 O 3 ) 2 3− compared with pristine chitosan. The adsorption of Au(S 2 O 3 ) 2 3− on ionic liquid modified chitosan followed Freundlich isotherm and pseudo-second order kinetic models, involving an anion-exchange mechanism with liquid film diffusion as the rate-limiting step. The chitosan modified with butylimidazolium-based ionic liquid had an adsorption capacity of 5.0 mg g −1 for gold (10 mg L −1 of gold, pH 6, 2 g L −1 of adsorbent dosage), outperforming other reported adsorbents. The ionic liquid modified chitosan showed a high adsorption efficiency of up to 96.7 % for Au(S 2 O 3 ) 2 3− in an actual thiosulfate leaching solution with a desorption efficiency of 98.4 %, suggesting that the ionic liquid modified chitosan has the potential to be a eco-friendly, biocompatible and effective adsorbent for the recovery of Au(S 2 O 3 ) 2 3− .
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Frontiers in Marine Science
·
2024
·
IF 2.8
Gao Nan,Kong Xiangfeng,Zhang Yanmin,Gao Yang,Zhang Yuanbiao,Liu Yan
In recent years, microplastics, especially marine microplastic pollution, have received global attention as a new type of environmental problem. The establishment of accurate and efficient methods for the detection of microplastics is the basis for in-depth research on the transport, transformation, fate, and ecotoxicological effects of microplastics in the environment. Microplastics in seawater frequently mix with biological tissues, resulting in challenges when identifying samples. However, commonly used pretreatment protocols for microplastics often suffer from long digestion times, inadequate digestion, and the risk of potentially damaging microplastics. This study compared the digestion efficiencies of five digestion reagents and provided further insights into two advanced oxidation methods involving Fenton’s reagent and an innovative alkaline K2S2O8 protocol based on sulfate and hydroxyl radicals. Using Raman spectroscopy, scanning electron microscopy-energy dispersive spectroscopy (SEM−EDS), and carbonyl index (CI) analyses, the status of microplastics after pretreatment was evaluated. The results revealed that the alkaline K2S2O8 method could enhance the reaction efficiency while reducing the potential for functional group damage during microplastic pretreatment. Moreover, the proposed K2S2O8 method was applied to the pretreatment of field seawater samples, and field microplastics were effectively separated from biologically rich samples. Thus, a digestion protocol based on alkaline K2S2O8 provides an effective way to isolate seawater microplastics from biologically rich samples. This study contributes to the development of efficiently microplastic monitoring and provides valuable insights into access to reliable data for fate and inventory of oceanic microplastics.
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Advanced Science
·
2024
·
IF 14.3
Ruomei Teng,Ming Li,Zikang Chen,Jianli Lin,Yuhan Zhang,Hang Li,Zejun Yan,Dingyuan Zhang,Caiping Ding,Youju Huang
Rapid and intelligent identification of prostate cancer (PCa) is critical for early diagnosis. Herein, a convenient, reliable, and intelligent strategy is proposed to screen PCa individuals through indirectly quantifying sarcosine (Sar), an early indicator of PCa, in clinical urine samples. Success is achieved by integrating sarcosine oxidase (SOX) as a specific recognition unit; nanozyme-assisted multicolor intelligent visualization platform as a signal reporter. With the Fe-MOFs and peroxidase, the synergetic action of SOX and response gold nanorods (Au NRs) is controlled etched to exhibit a multicolored signal. The sensor exhibits excellent linearity with Sar within 1–60 × 10 −6 m , boasting a remarkable detection limit of 0.12 × 10 −6 m . The RGB value of the display color can be directly extracted using a mobile phone camera. PCa diagnosis can be swiftly made (within 15 min) and directly by identifying two RGB colors ( R < 175 or B > 135). The enzyme-assisted multicolor intelligent visualization platform is adept at detecting minute differences in Sar concentration in urine samples between PCa patients and healthy individuals. The concept of enzyme-assisted multicolor sensing can be further expanded by modifying the type of immobilized enzymes, providing a valuable guideline for the rational design of multiple probes to measure specific biomarkers in biological samples.
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CELLULOSE
·
2024
·
IF 4.9
Zhang Hao,Chen Junfeng,Wang Yanan,Zhang Ying,Dou Huicheng,Zhong Hao,Guo Minghui
Wood-based laminated composites with excellent strength and toughness have attracted much attention, but it is a challenge to process fast-growing natural poplar wood with poor mechanical properties into high-performance laminated composites without the use of adhesives. In this study, natural poplar wood was delignified and TEMPO-oxidized by a “top-down” strategy to obtain a wood scaffold with a cellulose content of up to 98%, which was then used as a substrate and impregnated with Ca 2+ and PVA to form a large number of hydrogen and ionic bonds within the wood. Finally, under the action of hot pressing, laminated composites with high tensile strength (237 MPa), flexural strength (246 MPa) and impact toughness (50.45 KJ/m 2 ) were obtained, which also displayed excellent thermal stability and water resistance. This work demonstrates that the utilization of renewable fast-growing poplar wood as a substrate and glue-free bonding method can produce low-cost, sustainable and high-performance wood-based laminated composites.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Mohammad Almasi
The liquid densities and viscosities of ethyl octanoate (EO) blended with a series of 2-alkanols (2-propanol to 2-hexanol) over a temperature range of 293.15–323.15 K were investigated. Experimental data showed positive deviations from ideal behavior in excess molar volume and negative viscosity deviations in all tested fluids. These deviations in excess volume suggest that the intermolecular forces between EO and the 2-alkanols are relatively weak. A modified rough hard-sphere theory was utilized to model the pure substances and binary liquids viscosity. This approach combines the established transport properties of a smooth hard-sphere system with temperature-dependent hard-core volume and coupling parameters to explain deviations from ideal smooth hard-sphere behavior. Results for pure alkanols and ethyl octanoate within the range of 293–323 K showed a maximum viscosity error of 4.12 % for 2-hexanol. For binary mixtures, the calculated values aligned closely with experimental data, showing a maximum discrepancy of 3.18 % for the EO + 2-hexanol mixture.
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