CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Xinsheng Tang,Tursun Abdiryim,Ruxangul Jamal,Xiong Liu,Fangfei Liu,Feng Xu,Abdukeyum Abdurexit,Qian Cheng,Nawrzhan Serkjan,Shuyue Xie,Yiming Liu
TiO 2 -based ultraviolet (UV) photodetectors (PDs) with broadband optical detection range are widely used in commercial and military applications. Nevertheless, the self-powered UV PDs of TiO 2 nanoarrays (NRs) have relatively low response rates and slow response times. Here, a high responsivity self-powered p-n heterojunction UV PD based on TiO 2 NRs: CQDs/FTO and PEDOS/FTO is fabricated by a simple face-to-face assembly process. The pyroelectric effect of TiO 2 NRs is enhanced by sensitizing TiO 2 NRs with CQDs, which would reduce the bandgap value of TiO 2 NR, broaden the range of photoresponse, and reduce recombination of electron-hole. Furthermore, the pyro-phototronic effect of CQDs, the energy level matching from CQDs to PEDOS and the interaction between –OH in CQDs and ethylene oxide groups in PEDOS enhance the performance of the prepared UV PDs. The TiO 2 NRs: CQDs//PEDOS UV PDs achieve a high photo-responsivity and photo-detectivity of 150.95 mA/W and 3.73 × 10 11 Jones at 0 bias (365 nm), respectively, which are better than those at wavelengths of 380 nm. We also found that the photocurrent induced via the pyro-phototronic effect increases with the light power intensity. This work points the way for photovoltaic and photo-induced pyro-phototronic effects to improve the performance of TiO 2 NRs-based UV PDs.
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高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Renchan Han,Xiangyu Wang,Iseult Lynch,Jun Ma
Considering the agglomeration and instability of nanoscale zero-valent iron (NZVI, Fe 0 ), N-enriched covalent organic polymer derived zero-valent iron (NZVI@N-COP) composite with excellent activity, high stability and as well as effective antibiotic removal capacity was innovatively synthesized via solvent thermal and in-situ reduction growth methods. The dispersion of NZVI is distinctly improved by using N-enriched covalent organic polymer (N-COP) as both matrix and dispersant. NZVI@N-COP exhibits excellent electron transfer capability and high TC removal efficiency without additional oxidants. The removal efficiency of TC was increased by 42.4% compared with that of pristine NZVI. The promoted activity of NZVI@N-COP can be ascribed to the strong coordination of Fe with N atoms between NZVI and N-COP, which reduces oxidation and leakage of Fe, exposing more available reactive sites to produce reactive oxygen species . Additionally, Characterization results show that the reaction mechanism involves adsorption and chemical oxidation of O 2 •– without additional oxidants. Optimum operating conditions were determined to be NZVI@N-COP dosage 0.1 g·L −1 , pH 6, and temperature 298 K. This research put forward a simple method for synthesis of highly effective N-COP derived NZVI and its application in the treatment of antibiotic pollutants.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
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IF 22.1
Yuan Li,Miao-Ying Chen,Bang-An Lu,Hao-Ran Wu,Jia-Nan Zhang
Although the Mn-N-C catalyst has low toxicity and high durability, its intense pH-dependent ORR activity is perplexing and prevents its commercial use in PEMFCs. Herein, we have developed a novel understanding of the role of hydrogen peroxide in the pH-dependent activity and stability of Mn-N-C catalysts. Instead of nitrogen protonation, the strong pH effects of ORR activity are caused by the much faster kinetics of the H 2 O 2 reduction reaction in alkaline medium than in acid, due to the lower dissociation energy of the HO-OH bond in alkaline environment. Regarding durability, the deactivation induced by H 2 O 2 demonstrates a strong pH dependence, primarily due to the differing intensities of reactive oxygen species at different pH values. Correspondingly, isopropanol effectively reduces Fenton reagents and increases the acid resistance of Mn-N-C sites. The present research provides a mechanistic understanding of pH effects and paves the way for the creation of more efficient catalysts.
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Journal of the Taiwan Institute of Chemical Engineers
·
2023
·
IF 5.7
Zhixin Chen,Boyuan Ning,Yanqing Cai,Minghua Liu,Pingfan Xu,Peikun Zhang,Guangcan Xiao,Yunhui He
Background The accumulation of antibiotics in water systems has received considerable global attention due to its detrimental effects. There is an urgent need to develop rapid and efficient methods for the degradation of antibiotics. Methods In this work, a highly efficient AgFeO 2 /Ag 3 VO 4 photocatalyst was successfully fabricated by a hydrothermal method and analyzed using different techniques. Under visible light irradiation, photocatalytic behavior of AgFeO 2 /Ag 3 VO 4 heterojunctions in the degradation of levofloxacin is investigated. Significant findings The results showed that p-n heterojunction was formed between AgFeO 2 and Ag 3 VO 4 , which improved the separation and transfer of photogenerated charge carrier under the action of the internal electric field. The apparent reaction rate of AgFeO 2 /Ag 3 VO 4 heterostructure toward degradation of levofloxacin reached to 0.2770 min −1 , which was about 2.15 times and 36.73 times larger than those of Ag 3 VO 4 and AgFeO 2 , respectively, and much larger than other counterparts. Furthermore, possible photocatalytic degradation pathway of levofloxacin was comprehensively determined by LC-MS analysis. This work would provide in-depth understanding on the efficient photocatalytic removal of antibiotics for sustainable environmental remediation.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Jipeng Meng,Chuang Li,Xiao Chen,Chengye Song,Changhai Liang
Synthesis of highly-crystallized ZSM-48 zeolite with low SiO 2 /Al 2 O 3 ratio was successfully performed via seed-assisted route. The influence of various factors on the seed-assisted synthesis was investigated systematically, including the seeds dosages, different seeds species, adding order of seeds, hydrothermal temperature and time, silica and aluminum sources, and gel compositions. The crystallinity, morphology, textural and acidic properties of ZSM-48 were characterized by various techniques, such as XRD , SEM, FTIR, Py-IR, N 2 physisorption , 29 Si and 27 Al MAS NMR. Aluminum sources posed a critical influence on the crystallinity with NaAlO 2 more beneficial to obtain well-crystallized ZSM-48, whereas the crystallinity seemed slightly susceptible to silica sources. SEM results revealed that the crystal size was significantly reduced from ca. 20 μm to around 2 μm after introduced the seeds. Kinetic analysis suggested that the added seeds can significantly reduce the apparent activation energy of nucleation and crystallization, encourage the formation of crystal nuclei and promote crystallization. The Pt-supported seed-assisted samples exhibited considerably higher density of acid sites than that loaded on seed-free sample. The hydroisomerization of n -hexadecane was investigated over various Pt-supported catalysts, and the Pt-supported seed-assisted samples exhibited the highest i-C 16 yield of ca. 75 wt% at conversion over 87 wt%.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Li Li,Kaixuan Kuang,Xiuzhen Zheng,Jiahui Wang,Wei Ren,Jingbiao Ge,Sujuan Zhang,Shifu Chen
To enhance the efficiency of photocatalytic H 2 evolution, numerous methods are employed by increasing the utilization of photogenerated charge carriers (PCCs), including catalyst design, defect regulation, and selection of suitable H + resources. Using self-assembly method, CoWO 4 /Zn x Cd 1−x S with p–n heterojunction was synthesized. Although CoWO 4 (CW) cannot produce H 2 under visible light irradiation, it can provide photogenerated electrons (e − ) to Zn 0.3 Cd 0.7 S (ZCS), and largely increase the photocatalytic activity of ZCS. The optimal CW/ZCS composite can reach 15.58 mmol·g −1 ·h −1 , which is 45.8 and 24.3 times higher than the values of the pure CdS and ZCS, respectively. The largely enhanced photocatalytic H 2 production is attributed to the Zn vacancies (V Zn ), p–n heterojunction, and p-chlorobenzyl alcohol (Cl–PhCH 2 OH) as the H + source of H 2 production. V Zn on the ZCS surface as the capture center of photogenerated holes (h + ), can regulate the carrier distribution, which results in more photogenerated e − and less generated h + . The combination of p–n heterojunction and V Zn can enhance the separation and transfer efficiency of PCCs, and effectively inhibit the recombination of charge carriers. To further improve the utilization rate of PCCs, the photocatalytic H 2 evolution is proceeded by Cl–PhCH 2 OH oxidation in N , N -dimethylformamide solution, with 4-chlorobenzaldehyde (Cl–PhCHO) generated. The separated photogenerated e − and h + both participated in the redox reaction of H + reduction and Cl–PhCH 2 OH oxidation, considering that the amount of H 2 and Cl–PhCHO products are close to 1:1. This work not only facilitates the separation and transfer of PCCs, but also provides directions for the design of efficient photocatalysts and H 2 evolution in the organic phase.
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PubMed
高影响因子
IONICS
·
2023
·Vol. 29
·期 12
·5183-5193
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IF 2.8
Du Fang-Xiao,Liu Song-Li,Li Yang,Wang Jian-Kang,Zhang Peng
The scalable synthesis of MoS 2 /N-doped carbon (MoS 2 /NC) nanosheets was accomplished using a facile salt template–assisted synthesis method. The MoS 2 nanosheets were uniformly encapsulated in nitrogen-doped carbon frameworks. As an anode for sodium-ion batteries (SIBs), the electrochemical performance of the MoS 2 /NC electrode was significantly improved compared to pure MoS 2 , which demonstrated a reversible capacity of 334.6 mAh g −1 after 100 cycles at 0.2 A g −1 ; even after 250 cycles of 1 A g −1 , the capacity could still be maintained at 252.9 mAh g −1 . This excellent sodium storage performance was mainly due to the coupling of nitrogen-doped carbon with MoS 2 and the uniform distribution of the nanosheets, which improved the reaction kinetics. Besides, the electrochemical reconstruction ensured the integrity of the electrode. This work was of great significance for the large-scale synthesis of MoS 2 anode material with enhanced stability SIBs.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Changlin Xiao,Zihuan Tang,Zhuangzhuang Ma,Xiaotong Gao,Hongqiang Wang,Lichao Jia
Metal oxides based semiconductors promise high performance gas sensing owing to their robustness and low cost, but are limited by their unsatisfied adsorption ability and intrinsic low carriers' mobility. We herein demonstrate an efficient strategy of reducing the adsorption energy and improving the carrier mobility via bulk implanted TiO 2 nanocrystals (NCs) in LaFeO 3 porous structure . By implanting laser generated sub-3 nm TiO 2 NCs in LaFeO 3 samples, the response value (221.8 for 100 ppm formaldehyde) increases about 4 times comparing with that of pristine. Additionally, the sample exhibits high sensitivity and fast response/recovery speed toward formaldehyde steam. The detailed analyses and theoretical calculation proves that the TiO 2 NCs could cause the increase of adsorbed oxygen levels as well as the carrier mobility through forming the heterojunction with LaFeO 3 . This work verifies that TiO 2 NCs implanted LaFeO 3 is a promising formaldehyde sensing material, which provides a new approach to improve sensing ability of metal oxide semiconductor (MOS) based gas sensors.
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JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Yuting Wang,Xiaoyu Wang,Liming Chai,Enna Wang,Xionghui Wei,Zhaojun Wu,Jianbin Zhang
Density ( ρ ) and viscosity ( η ) data of polyethylene glycol 300 (PEG300) + N-methyldiethanolamine (MDEA) binary system at T = (298.15–318.15) K with a step of 5 K were measured at P = 1005 hPa. After that, the experimental ρ and η values were correlated and predicted by several semi-empirical models. Meanwhile, the Jouyban-Acree model presented a better fitting for the density, and the McAllister four-body equation presented a better fitting for the kinematic viscosity. Based on the ρ and η values, excess molar volume ( V m E ), partial molar volume ( V 1 ¯ and V 2 ¯ ), viscosity deviation ( Δη ), and excess Gibbs energy of activation of viscous flow ( Δ G ∗ E ) of PEG300 (1) + MDEA (2) binary system were systematically calculated and analyzed. These excess properties showed the predominance of intermolecular self-conjugation in PEG300 (1) + MDEA (2) binary system, and it was further demonstrated by various spectral characterizations. Importantly, the PEG300 + MDEA aqueous system was used for 5 CO 2 absorption (room temperature)-desorption (371.15 K) cycles at a CO 2 flow rate of 200 mL/min, with the average CO 2 capture performance of 0.65 mol CO 2 /mol MDEA of per cycle, demonstrating excellent absorption capability, and remained stable throughout the entire cycle.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yanhua Li,Guolong Ni,Kuo Zhang,Dongjia Wang,Qun Li,Shuhuan Wang
Herein, the 3D N-doped Ti 3 C 2 /TiO 2 sphere structure is constructed via an innovative three-step method including the preparation of 3D Ti 3 C 2 microspheres with PMMA as templates, the situ-growth of TiO 2 nanoparticles on Ti 3 C 2 and the subsequent annealing treatment in NH 3 . N element is doped in composite after annealing in NH 3 to improve the transfer rate of ions and electrons, and N-doped Ti 3 C 2 /TiO 2 hollow composite provides an abundant active surface for the sufficient contact between electrodes and electrolytes to enhance charge transport and electrolyte diffusion. Benefiting the unique structure feature and the synergistic effects of active materials, the N-doped Ti 3 C 2 /TiO 2 electrode exhibits a high specific capacitance of 572 F g −1 at a current density of 1 A g −1 and a superior cyclic stability of 99.6% of its initial value for 9500 cycles at 10 A g −1 . Based on this, a symmetric supercapacitor (SSC) based on N-doped Ti 3 C 2 /TiO 2 electrode is further assembled. The SSC shows a competitive capacitance of 157 F g −1 at 1 A g −1 . More importantly, the comparable energy density of 17.7 Wh kg −1 is achieved at the power density of 450 W kg −1 . This work will give promising guidance for designing and fabricating the durable electrodes with excellent electrochemical behavior for practical application in future.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 44
·20298-20305
·
IF 3.3
Yaoxia Yang,Lan Zhang,Fengyao Guo,Dangxia Wang,Xingwei Guo,Wei Zeng,Dongfei Sun
It is necessary to explore new energy sources to alleviate the excessive demand for fossil energy. Water electrolysis is a promising means of sustainable hydrogen evolution. Herein, a Cu/NCF precursor was nitrized to prepare a nitrogen-doped carbon-coated multi-component NC@NiCoCu-N/NCF composite material. The good synergistic interactions among the three nitride phases, Cu3N, Ni4N, and Co2N, make H2O decomposition and H2 release more balanced during the reaction. The content and temperature were adjusted to explore the changes in the catalyst morphology and the trapezoidal nanosheets were transformed into a disordered rough coral-like nanostructure that facilitates better electrolyte penetration and provides more accessible active sites during the nitriding process. Nitrogen-doped carbon can enhance the conductivity of the catalyst, protecting the internal active structure from the erosion of the electrolyte and improving the structural stability. The NC@NiCoCu-N/NCF composite exhibited excellent hydrogen evolution performance and the overpotentials reached 89 mV and 131 mV under the current density of 10 mA cm−2 in 1.0 M KOH and 0.5 M H2SO4, respectively. Chronopotentiometry results indicated that the catalyst could operate continuously for at least 48 h and still maintain excellent structural stability. This study has great significance for the development of polymetallic or multicomponent catalysts designed to accelerate the field of hydrogen energy.
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ELECTROCHIMICA ACTA
·
2023
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IF 6.6
Weiwei Han,Fan Zhang,Yi He,Chunlin Yu,Lecheng Lei,Xingwang Zhang
Developing highly efficient noble-metal-free bifunctional nanocatalysts for electrocatalytic water splitting is attractive but challenging. Notably, the rational structure engineering could effectively promote electronic transfer and improve the active area. Herein, a free-standing N-doped porous carbon nanosheet arrays encapsulated with metallic Co nanoparticles electrocatalyst (Co@NC-A) for overall water splitting was designed via pyrolysis process followed with acid treatment. The N-doped carbon matrix not only enhances electron mobility and protects the metallic Co nanoparticles from electrolyte corrosion, but also improves the electrochemically active area and facilitates mass transfer. Consequently, the Co@NC-A exhibits superior electrocatalytic performance toward OER ( η 10 = 270 mV) and HER ( η 10 = 162 mV) in 1 M KOH. Moreover, the Co@NC-A as a bifunctional catalyst in overall water splitting could approach 10 mA cm −2 at a cell voltage of 1.66 V and operate stably for 50 h. Combined with the density functional theory (DFT) calculations, the improvement of the HER and OER activities is also attributed to the modified electronic structure with N-doped carbon and the optimized free energy toward the adsorption/desorption of intermediates. This work provides a novel and facile non-precious metal catalyst for water splitting and should be instructive for designing more carbon-based nanocatalysts.
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