SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaoxue Liu,Ailin Gao,Tao Dong,Jiaming Li,Jian Liu,Changchao Jia
The photocatalytic reduction of CO 2 and H 2 O to form formic acid (HCOOH) holds promise for meeting the carbon–neutral target. However, the reduced efficiency of carrier separation and the material’s vulnerability to photo-corrosion significantly impede its practical application. Herein, a 0D/1D Cu 2 O/W 18 O 49 S-scheme heterostructure is prepared by in situ growing Cu 2 O nanocrystals on W 18 O 49 ultrathin nanorods via the wet chemistry method. In situ irradiation X-ray photoelectron spectroscopy characterization uncovered the formation of a stable internal electric field (IEF) at the heterojunction interface between W 18 O 49 and Cu 2 O, which facilitates the separation of photon-generated carriers through an effective interfacial S-scheme transmission mechanism. Small-sized Cu 2 O (5–10 nm) anchored on the ultrathin W 18 O 49 nanorods exposes abundant active sites and enhances carrier separation while inducing electrons generated from W 18 O 49 to consume the holes in Cu 2 O, thus preventing the oxidation of Cu 2 O. The W 18 O 49 /Cu 2 O S-scheme heterostructure with the optimized composite ratio (40 % Cu:W) exhibited excellent performance in HCOOH production (56.42 μmol g −1 h −1 , 23.2-fold enhancement compared to pristine Cu 2 O) and 100 % selectivity for CO 2 photoreduction in water without any sacrificial reagents. This work provides a rational method for improving the stability of the catalyst and regulating charge carrier migration for highly selective CO 2 photoreduction in water.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiushuai Guan,Xiaochao Zhang,Changming Zhang,Rui Li,Jianxin Liu,Yunfang Wang,Yawen Wang,Caimei Fan,Zhong Li
Photocatalysis CO 2 reduction into high-value-added chemical feedstocks is desirable for simultaneously addressing the solar energy storage, CO 2 excess and energy shortage issues. In this work, a kind of original S-scheme BiOBr-(0 0 1)/Bi 2 SiO 5 /Bi (OSB) heterostructure photocatalyst with rich oxygen vacancies is in-situ synthesized, which significantly promotes the photocatalytic CO 2 reduction performance. Interestingly, the lower formation energy of oxygen vacancy exhibits the easy feasibility on the BiOBr-(0 0 1) surface via the assistant of ultrasound. There exists the highest photocatalytic CO 2 reduction activity to CO of 234.05 μmol g -1 h −1 for OSB-20 sample (ultrasound time: 20 min), higher 3.3 times than OSB-0 sample (without ultrasound). Combined with experimental and calculated results, the significative formation mechanism, widened light-response range, highly-efficient separation/transfer paths and improved redox-reduction abilities of photogenerated electron-hole pairs for S-scheme OSB-20 heterostructure are investigated and proposed. Our findings provide new insights for the construction and synthesis of the S-scheme Bi-based heterojunction photocatalyst system.
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PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 109
·64354-64363
·
IF 3.708
Liangliang Qu,Lijing Wang,Ximing Xie,Guozhu Yu,Shaohua Bu
A series of modified solution-polymerized styrene butadiene rubbers (M-S-SBRs) with different molar contents of polar groups were prepared through grafting 3-mercaptopropionic acid into solution-polymerized styrene butadiene rubber (S-SBR) chains. The molar contents of the polar groups in M-S-SBR were calculated using 1H nuclear magnetic resonance (1H NMR) spectroscopy. Thermodynamic analytical methods, including the surface energy of M-S-SBR and filler flocculation, show that the introduction of polar groups increases the work of adhesion of filler–rubber (Wrf), which is an indicator for the compatibility of the filler with rubber. The thermodynamic results can be further proved by TEM micrographs. Strain sweep experiments were carried out to investigate the temperature dependent nonlinear strain-dependence of elastic moduli, referred to as the Payne effect. The filler–filler network and interfacial strength were studied in terms of critical strain γc and activation energy Ea. Dynamic mechanical measurements show that a combination of higher energy dissipation in the low temperature range and higher elasticity in the high temperature region were achieved for M-S-SBR/Silica when compared with their non-modified counterpart.
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高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 24
·3846-3855
·
IF 5.047
Bin Wang,Cheng Li,Lijun Yang,Congrou Zhang,Li-Juan Liu,Sen Zhu,Yu Chen,Yong Wang
The development of “turn-on” fluorescence probes for biological thiol detection has received great attention in recent years because abnormal levels of these mercapto biomolecules are always related to some form of disease. In this work, a series of AIE-active polymer probes for biothiol detection were designed and synthesized, comprising disulfide-functionalized hyperbranched poly(amido amine) (ssHPA) as the hydrophilic matrix, tetraphenylethene (TPE) as the hydrophobic AIE-active fluorogen and a disulfide bond as the cleavable functional linkage, defined as TPE-ssHPAs. When these polymers were targeted as “turn on” fluorescence probes for the detection of biothiols, no organic solvents or heavy metal ions were needed as the quencher to eliminate background signals because of the relatively rigid dendritic structure. Upon introducing glutathione or cysteine to an aqueous solution of TPE-ssHPAs, bright fluorescence occurred because of the collapsing of the dendritic structure, leading to the aggregation of TPE units. Further in vitro experiments verified that TPE-ssHPAs is a qualified probe for biothiol detection in living cells. In addition, this strategy of embedding AIEgens inside a relatively rigid hyperbranched polymer offers an effective solution to “pre-quench” the fluorescence of “turn-on” type AIE-active sensors.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 7
·3834-3844
·
IF 11.301
Daying Guo,Zihe Zhang,Bin Xi,Zhisheng Yu,Zhen Zhou,Xi'an Chen
Reported herein is the investigation of a unique cathode candidate for Li–S batteries, i.e. Ni3S2/(N, S)-RGO-type hybrid materials, which are expected to optimize battery performance by elevating the utilization of sulfur and chemically confining the adsorption/diffusion of polysulfide. Versatile structural and compositional characterizations confirmed the uniform growth and strong chemical coupling of nanostructured Ni3S2 on the N/S co-doped RGO matrix. Rich physical and chemical properties were revealed, namely, the large specific surface area and pore volume, which are beneficial for polysulfide capture, and the 3D conductive network supporting rapid charge transfer to the Ni3S2-polysulfide interface to improve the intrinsic equilibrium of the polysulfide. Specifically, the integration of ∼28.2 wt% of Ni3S2 produced a highly pleated composite with the largest BET specific surface area (618 m2 g−1) and pore volume (1.73 cm3 g−1) among the hybrids studied. This typical material also performed the best in the battery test, recording ultra-high cycling stability over 1000 cycles at the current density of 3C with the capacity decay of 0.023% per cycle. As the sulfur loading per unit area became as dense as 5.8 mg cm−2, the specific capacities were measured as 6.72 mA h cm−2 (at 0.05C), while the capacity retention for the 200-cycle test (at 1C) was still preserved above 72.5%.
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高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 18
·4007-4016
·
IF 5.773
Sen Liu,Guozhu Li,Yuying Gao,Zhourong Xiao,Junfeng Zhang,Qingfa Wang,Xiangwen Zhang,Li Wang
In this work, polydopamine (PDA)-coated multi-walled carbon nanotubes (CNTs) have been employed as reactive platforms for the anchoring of multiple heteroatom dopants. Single-, double-, and triple-doped CNTs with the elements N, S and B have been successfully prepared and systematically investigated as electrocatalysts for the oxygen reduction reaction (ORR). The obtained catalysts have been fully characterized by the nitrogen-adsorption technique, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Combining with the physicochemical properties of different doped CNTs and their catalytic performance, various doping modes are compared and the mechanism of these processes has been investigated. The synergetic effects on double and triple doped CNTs with N, S, and B are found. The new non-metal catalyst N–S–B-CNTs exhibits high electrocatalytic activity and good stability for ORR.
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高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Wang Dewei,Wang Shuangyu,Sun Jiaqi
Exploration of non-corrosive chemical activation agents that are capable of transforming sustainable biomass into nanocarbon with large specific surface area and suitable heteroatomic content for electrochemical energy storage applications is highly desired. Herein, potassium peroxodisulfate (K 2 S 2 O 8 ) has been proposed as the effective activation agent for the synthesis of N, S co-doped carbon nanosheets (N, S-CNSs) from renewable onions. Different from the other activation agents, it was found that the K 2 S 2 O 8 can act as the physical activating agent and chemical activating agent simultaneously owing to its temperature-dependent decomposition behavior. Consequently, the N, S-CNSs with large specific surface area of 2110.6 \({\mathrm{m}}^{2}{\mathrm{g}}^{-1}\) , optimal oxygen, nitrogen, and sulfur-containing functional groups were rationally emerged. The assembled Zn-ion hybrid supercapacitors with the as-prepared N, S-CNSs delivered a maximum specific capacity of 141.5 mAh \({\mathrm{g}}^{-1}\) , robust cycling stability with 98.3% capacity retention after 20,000 cycles, and large specific energy up to 113.4 Wh k \({\mathrm{g}}^{-1}\) . As explicitly discussed with the relevant characterizations, the study deeply explored the adaptability of the chemical activating agent in general synthesis of porous carbon-based materials from sustainable biomass, and great insight for designing high-performance electrochemical energy storage devices.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 4
·1743-1755
·
IF 2.817
Akbar Abdul Rehman,Wu Jinxing,Tahir Muhammad,Hu Huihui,Yu Chen,Qadir Muhammad Bilal,Mateen Fahad,Xiong Chuanxi,Yang Quanling
To push the upper limit of capacitive materials, the integration of multi-modal capacitive materials has emerged as a potential solution. In this regard, we reported the novel binary composite of self-suspended polyaniline (S-PANI) and multi-walled carbon nanotubes (MWNTs). Compared with conventional polyaniline, S-PANI offers higher porosity and fibrillar polymeric network, which was achieved by doping long-chain protonic acid during in situ polymerization. S-PANI was loaded on oxidized carbon nanotubes (OCNTs) and sulfonated carbon nanotubes (SCNTs) to prepare S-PANI/OCNT and S-PANI/SCNT composite electrodes, respectively. The conductive and exclusive fibrillar S-PANI provide unobstructed channels for charge transport and electrolyte infiltration. Preliminary electrochemical studies revealed that the capacitance of the composite electrode reached 316.8 F g −1 and 345.4 F g −1 , and established exceptional capacitance retention rates of 92.8% and 93.7% after 5000 cycles for S-PANI/OCNT and S-PANI/SCNT composite, respectively, making it a potential candidate for imminent energy storage devices.
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高影响因子
Small
·
2021
·Vol. 17
·期 52
·2105643
·
IF 13.281
Bo Liu,Linjuan Zhang,Yuanyuan Luo,Lei Gao,Guotao Duan
The supported metal catalysts on scaffolds usually reveal multiple active sites, resulting in the occurrence of side reaction and being detrimental to the achievement of highly consistent catalysis. Single atom catalysts (SACs), possessed with highly consistent single active sites, have great potentials for overcoming such issues. Herein, the authors used SACs to modulate kinetic process of gas sensitive reaction. The supported Pd SACs, established by a metal organic frameworks-templated approach, promoted greatly the detection capacity to hydrogen sulfide (H 2 S) gas with a very high sensitivity and selectivity. Density functional theory calculations show that the supported Pd SACs not only increased the number of electrons transferring from H 2 S molecules to Pd SACs, but strengthened surface affinity to H 2 S. Moreover, the H S bonds of H 2 S molecules absorbed on Pd atomic sites are more likely to be dehydrogenated directly into sulfur species. Significantly, quasi in situ XPS analysis confirmed the presence of sulfur species during H 2 S detection process, which may be a major cause for such detection signal. Based on these results, a suitable sensing principle for H 2 S gas driven by Pd SACs was put forward. This work will enrich catalytic electronics in chemiresistive gas sensing.
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PubMed
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Amir Abdul Razzaq,Ganwen Chen,Xiaohui Zhao,Xietao Yuan,Jiapeng Hu,Ziwei Li,Yufeng Chen,Jiabin Xu,Rahim Shah,Jun Zhong,Yang Peng,Zhao Deng
Sulfurized polyacrylonitrile (SPAN) represents a unique class of cathode material for lithium sulfur (Li-S) batteries as it eradicates the polysulfides shuttling issue in carbonate-based electrolyte. However, due to the essential chemical S-linking and organic nature of SPAN, the active mass percentage and rate capability are two bottleneck issues preventing its ultimate deployment outside of laboratories. In the current work, aiming to endow both the charge conductivity and catalytic activity to SPAN for maximizing the redox kinetics of S conversion, a freestanding nanofibrous SPAN cathode embedding conductive CNTs and atomically dispersed Co centers is fabricated via multivariate electrospinning. While the CNTs enable dramatically enhancing the fiber conductivity and generating mesoscopic porosity for facilitating charge and mass transportation, the cross-linking of SPAN by Co-N 4 S motifs creates extra charge conduction pathways and further serves as the catalytic active sites for expediting redox S conversion. As a result, an extraordinary Li-SPAN performance is achieved with a high specific capacity up to 1856 mAh g −1 @0.2 C, a superb rate capability up to 10 C, and an ultra-long battery life up to 1500 cycles@1 C. Consequently, our study here provides insights into the adoption of coordination chemistry to maximize the sulfur utilization by ensuring a more complete redox conversion from SPAN to Li 2 S, and vice versa .
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高影响因子
JOURNAL OF CONTROLLED RELEASE
·
2024
·
IF 10.5
Zhaowei Chu,Zhili Li,Haiyang Yong,Delu Che,Bingjie Li,Cong Yan,Tong Zhou,Xi Wang,Yuqing Feng,Kun Guo,Songmei Geng
Melanoma , one of the most devastating forms of skin cancer, currently lacks effective clinical treatments. Delivery of functional genes to modulate specific protein expression to induce melanoma cell apoptosis could be a promising therapeutic approach. However, transfecting melanoma cells using non-viral methods, particularly with cationic polymers, presents significant challenges. In this study, we synthesized three branched poly(β-amino ester)s (HPAEs) with evenly distributed branching units but varying space lengths through a two-step “oligomer combination” strategy. The unique topological structure enables HPAEs to condense DNA to form nano-sized polyplexes with favorable physiochemical properties. Notably, HPAEs, especially HPAE-2 with intermediate branching unit space length, demonstrated significantly higher gene transfection efficiency than the leading commercial gene transfection reagent, jetPRIME, in human melanoma cells. Furthermore, HPAE-2 efficiently delivered the Bax-encoding plasmid into melanoma cells, leading to a pronounced pro-apoptotic effect without causing noticeable cytotoxicity. This study establishes a potent non-viral platform for gene transfection of melanoma cells by harnessing the distribution of branching units, paving the way for potential clinical applications of gene therapy in melanoma treatment.
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 12
·5223-5231
·
IF 2.7
Tingli Ren,Yuanfeng Liu,Xiaoqiu Lin,Congju Li
The fairly low power density, mainly resulting from poor electroactive bacterial (EAB) adhesion and the sluggish extracellular electron transfer (EET) at the anode interface, constrains the practical implementation of microbial fuel cells (MFCs). Therefore, the properties of the anode material are considered to be a crucial factor for the long-term operational performance of MFCs. In order to enhance the power production performance of MFCs, an aerogel composed of Fe, N, and S co-doped carbon nanofibers (CNFs) and reduced graphene oxide (rGO) was employed as a high-performance anode material by electrospinning, high-temperature pyrolysis and freeze-drying. The doping of Fe, N and S elements induced the formation of abundant reactive sites on the CNFs, which enhanced the electrochemical performance of the anode and the EET process. The huge electroactive area of the samples facilitated the formation of dense biofilms. Therefore, an MFC with the FeS/Fe3C@NCNFs/rGO-modified anode achieved a maximum power density of 2792.56 mW m−2 and the highest output voltage of 0.658 V, both of which were significantly higher than those of the carbon cloth anode (773.97 mW m−2 and 0.443 V). Considering the great improvement in power production, it has considerable potential as a low-cost but high-performance anode material for MFCs.
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高影响因子
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