JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Lin Cheng,Qingsong Zhang,Min Xu,Qingchao Zhai,Chenglong Zhang
“Two-for-one” strategy is an effective method to construct two kinds of materials from a single precursor owing to the simplicity of fabricating procedure and reduction of manufacturing cost. However, such a strategy has seldom been utilized to produce both battery-type and capacitive electrodes of a hybrid supercapacitor (HSC) device. Here, we adopt the “two-for-one” strategy to fabricate three-dimensional (3D) porous iron-doped (Fe-doped) Co 3 O 4 and nitrogen-doped ( N -doped) carbon via a single bimetallic metal–organic framework, FeCo-ZIF-67. Fe-doped amounts and carbonization temperature are used to adjust their individual electrochemical behaviors. The optimal 3D porous Fe-doped Co 3 O 4 and N -doped carbon possess a high capacitance of 767.9 and 277C g −1 at 1 A g −1 , respectively. Charge storage mechanism of Fe-doped Co 3 O 4 is further investigated via analysis of capacitive and diffusion-controlled contribution. A Fe-doped Co 3 O 4 // N -doped carbon HSC device achieves desirable specific energy (37 Wh kg −1 ) and power (750 Wkg −1 ), and satisfied cycling stability (90% retention after 4000 cycles). A light-emitting diode (LED) is successfully light by the HSC device, suggesting its potential application in the field of green energy conversion and storage devices.
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DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3460
·
IF 5.076
Guanliang Sun,Ning Li,Dan Wang,Guanchen Xu,Xingshuang Zhang,Hongyu Gong,Dongwei Li,Yong Li,Huaipeng Pang,Meng Gao,Xiu Liang
Rapid and effective detection of pesticide residues from complex surfaces of fruits and vegetables has important significance. Herein, we report a novel three-dimensional (3D) hierarchical porous functional surface-enhanced Raman scattering (SERS) substrate, which is fabricated by successive two-step hydrothermal synthesis strategy of silver nanoparticles (Ag NPs) and cobalt oxide nanowires (Co3O4NWs) on the 3D copper foam framework as Cu@Co3O4@Ag-H. The strategy offers a new avenue for localized plasmonic materials distribution and construction, which exhibits better morphology regulation ability and SERS activity (or hotspots engineering) than physical spurring obtained Cu@Co3O4@Ag-S. The developed Cu@Co3O4@Ag-H possesses large surface area and rich hotspots, which contributes to the excellent SERS performance, including homogeneity (RSD of 7.8%), sensitivity (enhancement factor, EF of 2.24 × 108) and stability. The Cu@Co3O4@Ag-H not only provides plenty of Electromagnetic enhancement (EM) hotspots but also the trace detection capability for droplet rapid sensing within 2 s. Cu@Co3O4@Ag-H substrate is further developed as an effective SERS sensing platform for pesticide residues detection on the surfaces of fruits and vegetables with excellent LOD of 0.1 ppm, which is lower than the most similar reported works. This work offers new potential for bioassay, disease POCT diagnosis, national security, wearable flexible devices, energy storage and other related fields.Keywords:surface-enhanced Raman scattering;Cu@Co3O4@Ag;trace droplet;pesticide residues;3D hierarchical plasmonic nanomaterials;Cu foam framework
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiaoyu Zheng,Lin Xing,Xuemei Zhou,Yulian Tang,Zhen Liu,Xueting Zhang,Lei Hu,Zhengquan Yan
To monitor toxic NO 2 − and S 2− conveniently and effectively in 100% aqueous, nano CeO 2 was identified and modified first onto 2-dimensional Co 3 O 4 substrate (CeO 2 @2D Co 3 O 4 ) under microwave-assisted conditions at 140 °C. The obtained CeO 2 @2D Co 3 O 4 expressed excellent stability and superior oxidase-mimic activity with a wide temperature range from 20 to 60 °C. Under the optimized conditions (pH 4.0, 25 °C, 0.07 mM TMB), CeO 2 @2D Co 3 O 4 could accelerate the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue oxidation (oxTMB) within 12 min at room temperature , whose Michaelis constant ( K m ) and maximal reaction rate ( v max ) were 0.017 mmol/L and 2.17 × 10 −7 mol/L·s –1 respectively. Especially, both NO 2 − and S 2− could exclusively make the blue CeO 2 @2D Co 3 O 4 -TMB system into colorless and green respectively, expressing significant visibility. When applied for visual detection of NO 2 − and S 2− in real water, soil, drink and food samples, the recoveries were 97.6~104.6% and 97.5~104.1% with low detection limits of 3.26 × 10 −9 mol/L and 6.65 × 10 −8 mol/L (S/N = 3), far below the maxima in drinking water permitted by World Health Organization (WHO). The strengthened oxidase-mimic activity of CeO 2 @2D Co 3 O 4 and its different recognition mechanisms to NO 2 − and S 2− were studied in detail.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yarong Bai,Yaqin Hou,Yaoping Guo,Ning Xiang,Xiaojin Han,Haiqiang Wang,Zhongbiao Wu,Zhanggen Huang
Hollow structures have attracted great interest in many areas for their diverse applications. In this work, a new catalyst with an open and hollow structure (Co 3 O 4 @CoMn 2 O 4 ) is designed for selective catalytic reduction of nitrogen oxides by ammonia (NH 3 -SCR). The as-prepared hollow-structured catalyst provides a high surface area and has thin shells. Owing to its structural benefits, this catalyst exhibited enhanced nitrogen oxides (NO x ) removal activity and better resistance to water and sulfur dioxide than cobalt manganate nanoparticles . It also has proved that both the Eley-Rideal and Langmuir-Hinshelwood mechanisms are present in the NH 3 -SCR process in this catalyst. The improved nitrogen selectivity after the addition of water and sulfur dioxide occurs owing to the inhibition of nitrous oxide formation through the Eley-Rideal and Langmuir-Hinshelwood mechanisms. The deep insight into the structure–activity relationship and the influence of water and sulfur dioxide on nitrogen selectivity provide a new perspective for constructing high-performance de-NO x catalysts.
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高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Yu-Cheng Liu,Rong Zou,Wen-Wu Liu,Chong-Yang Cui,Yi-Xiao Lei,Cai-Xia Li,Sheng-Tao Niu,Zhi-Qiang Xu,Wei-Qian Chen,Wen-Jun Niu,Mao-Cheng Liu,Ming-Jin Liu,Bingni Gu,Fen Ran,Yu-Lun Chueh
Insertion of an inorganic HTM intermediate at the CsPbBr 3 /Carbon interface can significantly improve photo-generated holes extraction efficiency without sacrificing advantages in device stability. Herein, low-cost and eco-friendly Co 3 O 4 nanocrystals were synthesized by precipitation method and utilized as efficient inorganic HTM for CsPbBr 3 PSCs . By regulating the hole quasi-fermi level (E f, HTL ) of the perovskite film with Co 3 O 4 nanocrystals possessing a lower conduction band (CB), the built-in electric field (BEF) inside the CsPbBr 3 can be reinforced, for which the Co 3 O 4 -induced energy level reconstruction facilitates fast charge separation and extraction because of the intensified driving force. In addition, the charge recombination behavior can be effectively inhibited. Finally, all inorganic CsPbBr 3 PSCs with an architecture of FTO/ c -TiO 2 / m -TiO 2 /CsPbBr 3 /Co 3 O 4 /carbon PSC realizes efficiency of 8.92% with an open-circuit voltage ( V oc ) of 1.531 V. Furthermore, the unencapsulated Co 3 O 4 -based PSC exhibits excellent stability in ambient air, keeping 98% of its initial efficiency after 90 days in 80% high humidity condition, and 97% of initial efficiency after 40 days in a high-temperature atmosphere of ∼80 °C.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Fangfei Chen,Chaoyue Wu,Jinnan Wang,Corvini Philippe François-Xavier,Thomas Wintgens
To improve the visible-light photocatalytic activity and photo-carriers separation of BiVO 4 , highly efficient Z-scheme structured visible-light photocatalyst Ag@AgBr/BiVO 4 /Co 3 O 4 was constructed by selective doping of Ag@AgBr and Co 3 O 4 on {010} and {110} facets of BiVO 4 . Due to the different energy levels of conduction band (CB) and valence band (VB) between {010} facet and {110} facet, BiVO 4 could act as the ‘pre-separation channel’ to achieve spatial charge separation. Such pre-separation channel effect improved photo-electrons transfer from BiVO 4 {010} facets to electron mediator (Ag°) for subsequent recombination with holes of AgBr. Thus, the photo-induced electrons of AgBr could be accumulated on CB for reduction of O 2 to O 2 − . On the other hand, holes of BiVO 4 accumulated on {110} facets were captured by deriving-hole-type co-catalysts Co 3 O 4 for organics oxidation. In addition, Ag° not only served as the electron mediator of Z-scheme but also improve the visible-light utilization due to SPR-effect. Being attributed to the synergistic effect of pre-separation channel and deriving-hole-type co-catalysts, Z-scheme structured Ag@AgBr/BiVO 4 /Co 3 O 4 (0.15 wt%) achieved high photodegradation rate of organics. Even after 9th cycles, Ag@AgBr/BiVO 4 /Co 3 O 4 (0.15 wt%) could still photodegraded more than 90% of OTC within 24 min. DRS, PL and photoelectrochemical analyses also confirmed the improvement of visible-light utilization and charge separation of Ag@AgBr/BiVO 4 /Co 3 O 4 . The radical trapping experiments and EPR demonstrated that both superoxide radical ( O 2 − ) and holes (h + ) were main active species for organics photodegradation. In summary, this work not only constructed a highly efficient Z-scheme structured visible-light photocatalyst, but also provided a new method to diminish the photo-carriers recombination by pre-separation channel and hole-sink effects.
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高影响因子
危险品化学品经营许可证（带存储）