CHINESE JOURNAL OF CATALYSIS
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2020
·
IF 6.146
Pengfei Zhu,Xiaohe Yin,Xinhua Gao,Guohui Dong,Jingkun Xu,Chuanyi Wang
The controlled introduction of oxygen vacancies (OVs) in photocatalysts has been demonstrated to be an efficient approach for improving the separation of photogenerated charge carriers, and thus, for enhancing the photocatalytic performance of photocatalysts. In this study, a two-step calcination method where ZIF-8 was used as the precursor was explored for the synthesis of ZIF-8-derived ZnO nanoparticles with gradient distribution of OVs. Electron paramagnetic resonance measurements indicated that the concentration of OVs in the samples depended on the temperature treatment process. Ultraviolet–visible spectra supported that the two-step calcined samples presented excellent light-harvesting ability in the ultraviolet-to-visible light range. Moreover, it was determined that the two-step calcined samples presented superior photocatalytic performance for the removal of NO , and inhibited the generation of NO 2 . These properties could be attributed to the contribution of the OVs present in the two-step calcined samples to their photocatalytic performance. The electrons confined by the OVs could be transferred to O 2 to generate superoxide radicals, which could oxidize NO to the final product, nitrate. In particular, the NO removal efficiency of Z 350-400 (which was a sample first calcined at 350 °C for 2 h, then at 400 °C for 1 h) was 1.5 and 4.6 times higher than that of Z 400 (which was one-step directly calcined at 400 °C) and commercial ZnO, respectively. These findings suggested that OV-containing metal oxides that derived from metal-organic framework materials hold great promise as highly efficient photocatalysts for the removal of NO.
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高影响因子
Chinese Journal of Natural Medicines
·
2023
·
IF 4.6
Pan TANG,Dan HUANG,Kai-Xuan ZHENG,Dan HU,Ping DAI,Chuan-Hui LI,Sheng-Ying QIN,Guo-Dong CHEN,Xin-Sheng YAO,Hao GAO
From the fungus Trichoderma sp . , we isolated seven novel 18-residue peptaibols, neoatroviridins E-K ( 1−7 ), and six new 14-residue peptaibols, harzianins NPDG J-O ( 8−13 ). Additionally, four previously characterized 18-residue peptaibols neoatroviridins A-D ( 14−17 ) were also identified. The structural configurations of the newly identified peptaibols ( 1−13 ) were determined by comprehensive nuclear magnetic resonance (NMR) and high-resolution electrospray ionization tandem mass spectrometry (HR-ESI-MS/MS) data. Their absolute configurations were further determined using Marfey’s method. Notably, compounds 12 and 13 represent the first 14-residue peptaibols containing an acidic amino acid residue. In antimicrobial assessments, all 18-residue peptaibols ( 1 − 7 , 14 − 17 ) exhibited moderate inhibitory activities against Staphylococcus aureus 209P, with minimum inhibitory concentration (MIC) values ranging from 8−32 μg·mL −1 . Moreover, compound 9 exhibited moderate inhibitory effect on Candida albicans FIM709, with a MIC value of 16 μg·mL −1 .
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PubMed
高影响因子
NEW CARBON MATERIALS
·
2026
·Vol. 41
·期 4
·928-944
·
IF 7.2
Yiming Wang,Kerou Qiu,Haidong Yu,Zhiqiang Hou,Haotian Chen,Jiahao Cheng,Yabin Zhang,Jinliang Zhu,Bingsuo Zou
Sodium-ion capacitors (SICs) are attractive candidates for low-cost and safe energy storage, but their practical development is limited by the sluggish Na + storage kinetics and structural instability of the anodes. Control of both the bulk structure and surface chemistry can address these limitations and achieve fast and durable sodium storage. We report a heteroatom-rich porous carbon (HRPC) produced from spores by hydrothermal pretreatment, low-temperature carbonization, and acid-mediated functionalization. Control of both the pore structure and surface chemistry enables rapid ion/electron transport, improved electrolyte wettability, and abundant Na + adsorption sites. Density functional theory calculations show the distinct contributions of different heteroatom configurations to sodium adsorption, providing mechanistic insights into the improved storage behavior. The HRPC anode has an ultrahigh reversible capacity of 446.1 mAh g −1 at 50 mA g −1 , retaining 237.3 mAh g −1 at 2 A g −1 , and has an excellent cycling stability. A full SIC assembled with a polyaniline-derived porous carbon cathode has an energy density of 114.4 Wh kg −1 at 290 W kg −1 and an 84.3% capacity retention after 5000 cycles. This work establishes a scalable and sustainable route for converting biomass into high-value carbon anodes by controlling both the pore structure and surface chemistry, and providing a new way to provide high-performance sodium-ion energy storage. Download: Download high-res image (96KB) Download: Download full-size image
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Ning Zhang,Jiayi Du,Na Zhou,Depeng Wang,Di Bao,Haixia Zhong,Xinbo Zhang
Proton-exchange membrane water electrolysis, particularly driven by renewable electricity, is a sustainable strategy for green hydrogen production . However, developing highly active and stable electrocatalysts to accelerate the oxygen evolution reaction (OER) remains challenging. Herein, we introduce an effective strategy for constructing high-valence metal-doped IrO x with abundant oxygen vacancies, while simultaneously enhancing the catalytic activity and stability of the acidic OER. The synthesized Ta-doped IrO x (350-Ta@IrO x ) exhibits ultramicroscopic nanoparticle morphology and abundant surface oxygen vacancies, enabling a rapid OER process with a low overpotential of 223 mV at 10 mA cm -2 and 147.7 times higher mass activity (1207.4 A g Ir −1 ) than that of commercial IrO 2 at 1.55 V versus the reversible hydrogen electrode. More importantly, 350-Ta@IrO x affords excellent stability with insignificant potential degradation after 500 h of electrolysis at 10 mA cm 2 , originating from the low operating potential and suppressed dissolution and oxidation of oxygen vacancy active sites via Ta doping. Density functional theory calculations suggest that Ta doping and oxygen defect engineering are effective in facilitating the nucleophilic attack of water molecules, thereby accelerating the rate-determining step toward high catalytic OER activity on Ta-doped IrO x . We anticipate that this study will provide an effective method to obtain active and stable electrocatalysts via high-valence metal doping.
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高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2023
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IF 4.5
Kun WANG,Yan LIU,Jun HAO,Zhi-he DOU,Guo-zhi LV,Ting-an ZHANG
To recover copper from copper slag, a novel slag cleaning method was proposed. The thermodynamics and binary phase diagram of FeO–SiO 2 were calculated first. Then, the effects of experimental parameters on the reduction of Fe 3 O 4 , recovery of copper, and slag cleaning mechanism were investigated. The results showed that the addition of SiO 2 significantly reduced the initial reduction temperature of magnetite and pyrite. The contents of Fe 3 O 4 and copper decreased to 2.45 wt.% and 0.39 wt.%, respectively, with copper recovery of 92.52% under the optimum conditions. More than 94% silver and 99% gold subsided into the copper matte after slag cleaning. Approximately 72% of zinc and 75% of lead volatilized in the flue gas. The viscosity of the copper slag decreased from 0.68 to 0.12 Pa·s due to the reduction of magnetite. The sedimentation of copper matte droplets could be enhanced by mechanical stirring.
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Defa Liu,Bin Sun,Shuojie Bai,Tingting Gao,Guowei Zhou
Solar-powered semiconductor photocatalysis is considered a powerful strategy for addressing environmental pollution and energy crisis. Nevertheless, the separation and transfer abilities of photogenerated photocatalysts remain unsatisfactory. Herein, dual Ti 3 C 2 nanosheets/Ag co-catalysts synergistically decorated hierarchical flower-like TiO 2 microspheres for boosting photocatalytic H 2 production were fabricated by electrostatic self-assembly and subsequent photoreduction procedures. The optimal Ag/Ti 3 C 2 /TiO 2 composite demonstrated an excellent photocatalytic H 2 -production rate of 1024.72 μmol g −1 h −1 under simulated solar irradiation, achieving nearly 40, 2.3, and 1.8 folds with respect to that obtained on pristine TiO 2 , optimized Ti 3 C 2 /TiO 2 composite, and Ag/TiO 2 composite, respectively. The considerably improved photocatalytic H 2 -production activity is associated with the synergistic effect of the hierarchical flower-like structure of TiO 2 , excellent electrical conductivity of Ti 3 C 2 , and surface plasmon resonance effect of Ag, which enhances the light absorption capacity and promotes the separation and transfer of photogenerated carriers. This study provides insight into the design of high-efficiency photocatalysts with dual co-catalysts for solar H 2 production.
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Zhidong Wei,Jiawei Yan,Weiqi Guo,Wenfeng Shangguan
The light penetration effect will weaken the driving force of charge separation from phase to surface by the built-in electric field of nanoscale photocatalysts, like low-dimensional materials. Therefore, in this study, a novel nanoscale lamination catalyst design method was proposed using a polymeric carbon nitride (PCN)-nano polyhedral SrTiO 3 core-shell structure catalyst (PCN-SrTiO 3 ). The results showed that the nanoscale lamination effect could be generated by the formation of the N–Sr bond, which could regulate the built-in electric field of the PCN simultaneously. Moreover, detailed characterization indicated that the N–Sr bond, which facilitates the generation of N vacancies in PCN, could act as a novel channel for charge transfer. Both surface and interior core N-deficient PCN have been discovered, resulting in more positive and negative VB positions, respectively. Synchronously, the light absorption ability of the PCN-SrTiO 3 samples increased. Consequently, the enhanced photocatalytic overall water splitting could be ascribed to the synergism of the built-in electric field regulation caused by the N-Sr formation-induced nanoscale lamination effect, which was favorable for energy flow adaption on the spatiotemporal scale.
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高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Lin Liu,Guifang Wang,Qingqin Feng,Yun Xing,Hongxing Han,Min Jing
Sandwich-type biosensor is one of the major analytical techniques for sensitive and selective detection of biomolecules. In this format, the crucial step is the capture and identification of analytes. In this work, we reported a sandwich-type electrochemical biosensor for the detection of dopamine (DA). Nitrilotriacetic acids complexing Fe(III) were immobilized onto gold electrodes to capture DA. The amino groups of DA were derivatized by biotin for the attachment of gold nanoparticle/streptavidin conjugates capped with multiple ferrocene tags. Well-defined voltammetric peaks of high signal intensity were obtained. DA concentrations ranging from 0.5 to 20 nM can be readily determined. A detection limit of 0.1 nM was achieved, which is lower than those achievable using the modified electrodes reported so far. This method was demonstrated to be highly sensitive, accurate and reproducible.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Zexing Wu,Yuxiao Gao,Zixuan Wang,Weiping Xiao,Xinping Wang,Bin Li,Zhenjiang Li,Xiaobin Liu,Tianyi Ma,Lei Wang
Developing multifunctional electrocatalysts toward energy-related reactions could reduce the cost and improve the utilization efficiency of raw materials. Herein, defective CoP decorated with ultrafine Pt nanoparticles (Pt/d-CoP/NPC) with multifunctional electrocatalytic performances is prepared via facile pyrolysis and following chemical reduction process. The as-synthesized Pt/d-CoP/NPC owns high half-wave potential of 0.82 V for oxygen reduction reaction with excellent stability in 0.1 mol/L KOH. Density functional theory calculations demonstrate that the adsorption energy of *OO at Pt/d-CoP/NPC is stronger compared to Pt, yielding higher catalytic activity for ORR. Moreover, the resultant electrocatalyst possesses excellent catalytic activities with low overpotentials toward hydrogen evolution reaction (33 mV in 1 mol/L KOH, 6 mV in 0.5 mol/L H 2 SO 4 and 70 mV in 1 mol/L PBS) and oxygen evolution reaction (320 mV) at 10 mA/cm 2 . Water-splitting and rechargeable Zn-air batteries assembled with the as-synthesized Pt/d-CoP/NPC as electrodes exhibit outstanding activity and long-range stability. Remarkably, sustainable energies and homemade Zn-air battery can efficiently drive the Pt/d-CoP/NPC electrolyzer with sumless hydrogen bubbles generated, verifying the potential applications for renewable energy storage.
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CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Jiangnan Xing,Fei Lin,Liutao Huang,Yuchang Si,Yijing Wang,Lifang Jiao
ABSTRACT In an attempt to develop low-cost, non-noble-metal bifunctional electrocatalysts for water elec-trolysis in alkaline media, cobalt-doped molybdenum carbide@N-doped carbon nanosheets/nanotubes were fabricated by using C 3 N 4 as the carbon source on a 3D porous nickel foam substrate. Benefiting from the optimized electronic structure and enhanced mass and charge transport, as well as the 3D conducting pathway, Mo x Co y @N-CNS /CNT shows superior performance towards both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline medium. The optimal electrocatalyst is Mo 2 Co 1 @N-CNS /CNT , which reveals a current density of 10 mA cm -2 at the low overpotentials of 99 mV and 300 mV for the HER and OER, respectively, and a relatively low cell voltage (1.63 V) for the overall water electrolysis. The method of optimizing the composition and nanostructure of a material provides a new avenue for the development and utilization of high-performance electrocatalysts.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Muhammad Tuoqeer Anwar,Xiaohui Yan,Muhammad Rehman Asghar,Naveed Husnain,Shuiyun Shen,Liuxuan Luo,Xiaojing Cheng,Guanghua Wei,Junliang Zhang
Carbon black is utilized as a conventional electrocatalyst support material for proton exchange membrane fuel cells. However, this support is prone to corrosion under oxidative and harsh environments, thus limiting the durability of the fuel cells. Meanwhile, carbon corrosion would also weaken the linkage between Pt and the support material, which causes Pt agglomeration, and consequently, deterioration of the cell performance. To overcome the drawbacks of a Pt/C electrocatalyst, a hybrid support material comprising molybdenum disulfide and reduced graphene oxide is proposed and synthesized in this study to exploit the graphitic nature of graphene and the availability of the exposed edges of MoS 2 . TEM results show the uniform dispersion of Pt nanoparticles over the MoS 2 -rGO surface. Electrochemical measurements indicate higher ECSA retention and better ORR activity after 10000 potential cycles for Pt/MoS 2 -rGO as compared to Pt/C, demonstrating the improved durability for this hybrid support material.
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高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 6
·066108
·
IF 1.321
Qing Yu,Jiangjian Shi,Pengpeng Zhang,Linbao Guo,Xue Min,Yanhong Luo,Huijue Wu,Dongmei Li,Qingbo Meng
A study of the self-healing phenomenon of Cu2ZnSn(S, Se)4 (CZTSSe) solar cells has shown more than 10% enhancement in cell performance after storage at room temperature for a week, with a significant improvement in the open-circuit photovoltage (Voc) and fill factor (FF). In addition, up to 10.45% power conversion efficiency (PCE) has been achieved. No obvious change in crystallinity, crystal phase, optical absorption or elemental distribution in the CZTSSe films was detected on examining the x-ray diffraction (XRD) pattern, Raman spectrum, ultraviolet-visible (UV-Vis), and TOF-SIMS. Further investigations on the charge carrier concentration, charge radiative recombination, and band structure suggest that the enhancement in PCE stems mainly from a reduction in deep defects of the CZTSSe semiconductor film.
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高影响因子
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