Materials Today Physics
·
2021
·
IF 9.298
Chengyuan Tang,Xinyu Shen,Siyao Yu,Yuan Zhong,Zhenyu Wang,Junhua Hu,Min Lu,Zhennan Wu,Yu Zhang,William W. Yu,Xue Bai
Inorganic CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals (PNCs) have a great promise for LED applications due to their high brightness and tunable emission. However, the long chain capping ligands such as oleylamine and oleic acid function are electrically insulating layers to hinder the charge carrier injection and transport, limiting the device performances. To overcome the limitations, p -iodo-D-phenylalanine (PIDP) was used in the post-treatment process of PNCs to partially substitute the long insulating ligands to improve the conductivity of CsPbI 3 PNC films. Besides, the surface defects were also passivated by PIDP, increasing the radiative decay rate and decreasing the non-radiative decay rate, thus enhanced the photoluminescence quantum yield of the PNCs. As a result, highly efficient PNC LEDs were obtained with an external quantum efficiency of 12.4% and a peak luminance of 2000 cd m −2 .
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Bioresources and Bioprocessing
·
2021
·Vol. 8
·期 1
·1-15
·
IF 4.578
Tan Xu,Zhang Sheng,Song Wei,Liu Jia,Gao Cong,Chen Xiulai,Liu Liming,Wu Jing
In this study, a four-enzyme cascade pathway was developed and reconstructed in vivo for the production of d - p -hydroxyphenylglycine (D-HPG), a valuable intermediate used to produce β-lactam antibiotics and in fine-chemical synthesis, from l -tyrosine. In this pathway, catalytic conversion of the intermediate 4-hydroxyphenylglyoxalate by meso -diaminopimelate dehydrogenase from Corynebacterium glutamicum ( Cg DAPDH) was identified as the rate-limiting step, followed by application of a mechanism-guided “conformation rotation” strategy to decrease the hydride-transfer distance d (C6HDAP−C4NNADP) and increase Cg DAPDH activity. Introduction of the best variant generated by protein engineering ( Cg DAPDH BC621/D120S/W144S/I169P with 5.32 ± 0.85 U·mg −1 specific activity) into the designed pathway resulted in a D-HPG titer of 42.69 g/L from 50-g/L l -tyrosine in 24 h, with 92.5% conversion, 71.5% isolated yield, and > 99% enantiomeric excess in a 3-L fermenter. This four-enzyme cascade provides an efficient enzymatic approach for the industrial production of D-HPG from cheap amino acids.
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高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Yu Feng,Yu Zhang,Jie Sheng,Tiandong Zhang,Qingguo Chi,Qingguo Chen,Weidong Fei
Multiferroic materials have good application prospect in the field of non-volatile random access memory due to the simultaneous existence of ferroelectricity, ferromagnetism, and the coupling between them. In this work, two kinds of nanofibers (pure CoFe2O4 nanofibers and CoFe2O4 nanofibers coated with a BaTiO3 layer) were designed and fabricated. P(VDF-TrFE)-based composites with aligned nanofibers were prepared via high-speed directional electrospinning. The effect of ferromagnetic nanofibers on the ferroelectricity of composites was investigated, and the multiferroic performance and magnetic anisotropy were observed. The leakage current of the composite can be well suppressed after coating the BaTiO3 layer, and it makes the composite possess enhanced ferroelectric and ferromagnetic properties at the same time. Notably, the maximum polarization and remnant polarization of a 10 vol % P(VDF-TrFE)/CoFe2O4@BaTiO3 composite reach 8.0 and 7.0 μC/cm2, respectively, when the applied electric field is 1000 kV/cm. Meanwhile, the maximum magnetization and remnant magnetization are 5.9 and 2.0 emu/g at 20,000 Oe, respectively, and the magnetization along the nanofiber direction is larger than that perpendicular to the nanofiber direction on the surface of the composites. The maximum values of the magnetoelectric voltage coefficient reached 5111 mV/cm·Oe (Hdc = 8083 Oe) for the 5 vol % P(VDF-TrFE)/CoFe2O4@BaTiO3 composite. The excellent ferroelectric and ferromagnetic properties in a high electric field make flexible composites promising to be an ideal material for improving the multiferroic devices.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 11
·14966-14975
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IF 2.478
Chen Tian-Yun,Zhang Ya-Qi,Fu Ying-Yan,Qian Min,Dai Hao-Jiang,Ye Bo,Qin Shan,Yang Qing-Hua
Hydrogen energy is regarded as one of the most important clean energy in the twenty-first century, and improving the catalytic efficiency of hydrogen evolution reaction (HER) is the basis for realizing the large-scale hydrogen production. Transition metal phosphides (TMPs) were proved to be efficient electrocatalysts for HER. In this work, we first synthesized the nickel-molybdenum bimetallic precursors, followed by high-temperature calcination in air. Finally, NiMoP/MoP nanorods (Ni–Mo–P NRs) was obtained by chemical vapor deposition (CVD) of phosphating. The target catalyst of Ni–Mo–P NRs was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). For Ni–Mo–P NRs, the electrochemical test in 0.5 M H 2 SO 4 solution for HER showed that the optimal feeding ratio was Ni:Mo = 1:1. And the Ni 1 –Mo 1 –P NRs presented an onset potential of 63.2 mV, and an overpotential of 117.9 mV was required to drive the current density of 10 mA cm −2 . Meanwhile, The Tafel slope, exchange current density ( j 0 ), electrochemical double-layer capacitance ( C dl ) were 58.6 mV dec −1 , 0.10 mA cm −2 , 12.6 mF cm −2 , respectively. Moreover, there was no obvious activity diminish of Ni 1 –Mo 1 –P NRs after a long-term stability and durability test.
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JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 6
·1250-1261
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IF 3.089
Lin Zhilan,Zhu Jianhui,Zhang Peixin,Deng Libo
Abstract Spherical carbonaceous materials are considered as ideal electrode materials for supercapacitors because of their high electrical conductivity and excellent electrochemical and mechanical stability. However, their overall performances are yet to be enhanced to meet the future demands. Herein, we prepared a supercapacitive carbon microsphere with hierarchical porous structure and doped them with both nitrogen and phosphor. This was achieved by a facile hydrothermal treatment of cyclodextrin, followed by pyrolysis in the presence of ammonium dihydrogen phosphate and finally by KOH activation. Benefiting from the porous microspheres structure, large surface area, and rich nitrogen and phosphorus heteroatoms, the as-prepared materials demonstrated excellent capacitive performance, with a specific capacitance of 182 F g −1 at 1.0 A g −1 and good rate performance as well as 100% retention after repeated charging and discharging for 5000 cycles, which are superior to the carbon microspheres without heteroatom doping. Graphic abstract
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CHEMOSPHERE
·
2021
·
IF 7.086
Hongfei Ren,Zexiang Wang,Xiaoming Chen,Zhenyang Jing,Zhengjun Qu,Lihui Huang
In this study, cerium-doped lanthanum ferrite perovskite oxides (La 1‒x Ce x FeO 3 ) with different A-site were synthesized using a sol-gel method and they were used as ozonation catalyst for p -nitrophenol (PNP) mineralization for the first time. Catalytic activity in terms of total organic carbon (TOC) removal followed the order of La 0.8 Ce 0.2 FeO 3 > La 0.4 Ce 0.6 FeO 3 > La 0.6 Ce 0.4 FeO 3 > La 0.2 Ce 0.8 FeO 3 > LaFeO 3 with 77, 66, 61, 60 and 56% respectively. The synthesized catalysts were characterized by diffraction of X-ray (XRD), Raman spectroscopy , Brunauer-Emmett-Teller (BET) and scanning electronic microscopy (SEM). Moreover, electron spin resonance (ESR) and radicals quenching experiments showed that the active oxygen species in the ozone decomposition process are mainly hydroxyl radical (·OH), and also include superoxide radical (O 2 − ) and singlet oxygen ( 1 O 2 ). Furthermore, the superior activity of La 0.8 Ce 0.2 FeO 3 could be attributed to the higher surface area, the richer lattice oxygen, richer surface –OH groups and the facilitated redox Ce 3+ /Ce 4+ and Fe 2+ /Fe 3+ cycling. In addition, this study provides an insight to use metal-doped perovskite catalysts for catalytic ozonation.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Guohao Chen,Lin Gao,Lulu Zhang,Xuelin Yang
Transition metal phosphates (TMPs) are considered as promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacity (up to 1000 mAh g −1 ) and low cost. However, the poor electrochemical reaction kinetics and large volume expansion of TMPs are not conducive to practical applications in SIBs. In view of this, a kind of self-supported iron nickel phosphide (Fe-Ni-P) composite nanosheet arrays are obtained by reasonable hydrothermal reaction and phosphidation process. The nanosheet arrays construction can significantly release the mechanical strain and promote electrochemical reaction kinetics. Furthermore, the volume expansion can be largely alleviated by the synergistic effect of Fe 2 P and Ni 2 P. Benefiting from the unique design, the robust Fe-Ni-P arrays manifest remarkable Na + storage capability. The Fe-Ni-P nanosheet arrays exhibit a large discharge capacity of 300.9 mAh g −1 after 100 cycles at 0.1 A g −1 . And there is a reversible capacity of 201.7 mAh g −1 can be maintained without obvious capacity loss after 200 cycles at 0.5 A g −1 in SIBs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Junqing Chang,Mati Horprathum,Dianhui Wang,Gang Meng,Zanhong Deng,Bin Tong,Pinit Kidkhunthod,Tiantian Dai,Meng Li,Hongyu Liu,Wei Tong,Shimao Wang,Xiaodong Fang
Though p-type NiO possesses excellent catalytic oxidation property toward volatile organic compounds (VOCs), intrinsic low sensitivity of NiO (arising from the hole accumulation layer configuration in ambient air atmosphere sensor) restricts its promising applications in VOCs detection. In this study, Sc and Li were proposed to modulate the (surface) properties of NiO nanosheet-flowers based sensors. At the optimal 2 at.% Sc and 5 at.% Li doping ratio (Ni 0.93 Sc 0.02 Li 0.05 O), the sensitivity to 100 ppm ethanol is 118.4 (105 times higher than that of pure NiO), which is comparable to or even higher than most of reported NiO based sensors. Moreover, Ni 0.93 Sc 0.02 Li 0.05 O sensor exhibits a low detection limit of 10 ppb, excellent repeatability and long-term stability (∼30 % decline of response after 7 months). Apart from regulating the carrier concentration, defect characterizations indicate a noticeable increase of stabilized surface oxygen vacancy (O V ) defects and Ni 3+ cations by Sc 3+ and Li + co-doping, which greatly facilitate the adsorption of VOCs molecule (revealed by density functional theory calculation) as well as the subsequent VOCs/NiO interfacial charge interaction, thus contribute to the superior sensing performances. This work demonstrates that co-doping offers an effective avenue for boosting the performances of (p-type) oxide sensors.
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Materials Today Chemistry
·
2021
·
IF 8.301
J. Zhu,C. Shang,X. Wang,G. Zhou
Phosphorus-based materials as the anode for sodium-ion batteries have drawn extensive attention because of their high theoretical capacity and low insertion potential. Nevertheless, the severe volume variation and low electric conductivity hindered their further practical applications. Herein, a novel Co 2 P/Sn 4 P 3 hybrid encapsulated in carbon nanocubes was fabricated by a coprecipitation method followed by phosphating progress. Accompanying with the N, P codoping and abundant grain boundaries, which facilitates electric transport and provides rich active sites, the as-synthesized Co 2 P/Sn 4 P 3 @C anode delivered a high charge specific capacity of 185.6 mA h g −1 after 400 cycles at the current density of 1000 mA g −1 and outstanding cycling stability with a high capacity retention of 86.9%. Kinetics exploration indicated that the capacity was governed by the surface pseudo-capacitive controlled process due to the abundant defects originated from heteroatom doping and grain boundaries.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Ming Li,Caiping Ding,Pengde Jia,Longhua Guo,Sui Wang,Zhiyong Guo,Fengmei Su,Youju Huang
p -Aminophenol (p-AP) is one of the common environmental pollutants with teratogenic effects, nephrotoxicity and genotoxicity. In this study, a novel colorimetric method for quickly, sensitive and on-site detection of p-AP was developed based on target induced etching of AuNRs, which will generate colorful color changes. Our investigation reveals that potassium iodate (KIO 3 ) can be reduced by p-AP to generate iodine (I 2 ), and I 2 can etch CTAB stabilized AuNRs along the longitudinal direction. As an emerging fascinating colorimetric material, LSPR extinction peak of AuNRs will shift to short wave direction with a color change from the initial tea red to brown, gray, dark green, cyan, blue, indigo, purple, purplish red and final pink. Under the optimal conditions, our strategy is analytically specific and sensitive for the detection of p-AP from 0.5 μM to 20 μM by the naked eye, and a detection limit of 0.27 μM was achieved. Meanwhile, this colorimetric method is used to detect p-AP in environmental water, paracetamol tablets and human urine. Hence, this proposed strategy has the advantages of rapid semi-quantitative analysis of p-AP with naked eyes, simple operation and good application prospect.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yajie Bai,Jianmin Lu,Hongye Bai,Zhenyuan Fang,Fagen Wang,Ying Liu,Dongtian Sun,Bifu Luo,Weiqiang Fan,Weidong Shi
The photoelectrochemical N 2 reduction reaction (PEC NRR) is extremely charming to the synthetic ammonia (NH 3 ), for its mild operating conditions and low carbon footprint. Taking account of the strong chemical inertness of N 2 and competitive hydrogen evolution reaction, it is necessary to explore a robust and stable photoelectrocatalyst. Herein, a robust p-type BiVO 4 (p-BiVO 4 ) photocathode is firstly reported for NRR under ambient conditions. Interestingly, V sites are proved as the mainly ideal active center for N 2 adsorption/activation based on the density functional theory (DFT) calculations. The ammonia evolution rate ( V NH3 : 11.6 × 10 −8 mol h −1 cm −2 ) and Faradaic efficiency (16.2%) were obtained at −0.1 V vs. RHE in 0.1 M Li 2 SO 4 solution, outperforming most of the photoelectrocatalysts reported thus far. Moreover, the 1 H nuclear magnetic resonance result confirmed that the source of N was completely from the feeding N 2 gas. This work provided a new opportunity to tap the V-based photocathode in the field of PEC NRR.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yi Ding,Lixin Dai,Rui Wang,Haixiao Wang,Hengbin Zhang,Wei Jiang,Jun Tang,Shuang-Quan Zang
Optimizing the performance of electrode materials is crucial for improving the energy density of aqueous supercapacitors. Herein, a novel strategy inspired by biomimetic mineralization is developed to acquire a hierarchical flower-like Mn 3 O 4 @N, P-doped carbon (NPC) composite, which consists of multi-intercalated Mn 3 O 4 nanosheets and NPC cores. The Mn 3 O 4 nanosheets offer abundant active regions, and their C-O-Mn bonds with NPC ensure the fast electron transfer kinetics. It is noteworthy that the intercalation pseudocapacitance mechanism of Mn 3+ /Mn 4+ transformation in Mn 3 O 4 @NPC not only extends the potential window to 0–1.3 V (vs Ag/AgCl) but also significantly increased pseudocapacitance. Benefits from the advantages of structure and energy storage mechanism, the Mn 3 O 4 @NPC electrode delivers a high specific capacitance of 370.8 F g −1 and superior rate performance. A 2.6 V flexible aqueous asymmetric supercapacitor (FAAS) is fabricated by integrating Mn 3 O 4 @NPC cathode with an electrochemically reduced porous carbon anode and a PVA-Na 2 SO 4 hydrogel electrolyte. Notably, the FAAS delivers a high energy density of 76.96 Wh kg −1 as well as excellent rate capability. The device exhibited an excellent stability during 10,000 cycles and additional 240 h floating test. The strategy will pave the way for the development of electrode materials for FAASs.
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