CRYSTENGCOMM
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2021
·Vol. 24
·期 6
·1189-1194
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IF 3.545
Mengya Yang,Rong Zhao,Yi Liu,Hua Lin
In this work, a highly efficient electrocatalyst Fe-Ni2P/N-GO with hierarchical structure was developed through phosphating NiFe-based layered double hydroxide (LDH) supported by N-doped graphene oxide (GO), which was assembled by a solvothermal method. The LDH-derived Fe-Ni2P/N-GO composites were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Electrochemical measurements show that Fe-Ni2P/N-GO has excellent oxygen evolution reaction (OER) performance with an overpotential of 269 mV at a current density of 10 mA cm−2 and a Tafel slope of only 72 mV dec−1. Besides, the composite exhibits a minimum charge transfer resistance compared with Fe-Ni2P and Fe-Ni2P/GO, and high long-term stability in alkaline solution.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Na Huang,Ning Zhao,Ce Zhang,Chunhao Li,Xia Wei,Yang Zhang,Yongsheng Bao,Shuai Wang
Based on the goal to improve the humidity index of the microenvironment and enhancing human comfort, this study used electrospinning to prepare several photoresponsive films with reversible regulation of wettability and microenvironmental humidity from copolymers of acrylated spiropyran (SPA), N-isopropylacrylamide (NIPAm), and methyl methacrylate (MMA). According to the photoisomerization mechanism of spiropyran, the simple ultraviolet (UV)–visible light (vis) reversible light radiation change makes the spiropyran unit switch between the polar ring-opened form and the nonpolar ring-closed form. Utilizing this transition can easily regulate the wettability of the film surface and microenvironmental humidity. The experimental results show that poly(SPA1-co-NIPAm2-co-MMA8) nanowire film has the best ability to regulate wettability and humidity; the wettability can vary within a range of 13° and the microenvironmental humidity up to 7.2%.
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Forests
·
2023
·Vol. 14
·期 5
·965
·
IF 2.9
Gaojun Chen,Yudong Li,Enshan Han,Ziqiang Zhang,Xiaohui Yang,Desheng Zhou,Yanzhen He
The optimization of supercapacitive properties in carbon materials derived from cheap and sustainable wood scraps exhibits great application potential. Herein, in support of interfacial groups, polyaniline nanospheres were in situ constructed in the internal pore structure of wood scraps; further, the B and N elements were imported by carbonized and hydrothermal methods. The doped B regulated the species of N doping to improve the electrical conductivity of carbonized wood scraps, and it endowed a certain pseudo-capacitance. Coupled with the fine double-layer capacitance from the hierarchical structures constructed by carbonized nanospheres and wood scrap channels, a high specific capacitance of 406 F g−1at 0.5 A g−1, high energy density (17.71 Wh kg−1at 250 W kg−1) and cycle stability (93.04% capacitance retention after 10,000 cycles) were performed simultaneously. This study provided a new strategy to improve the supercapacitive performance of bio-carbon materials in terms of structure and conductance.Keywords:wood scrap;B/N co-doping;porous carbon;in situ synthesis;supercapacitor
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 9
·2607-2624
·
IF 3.186
Zhang Qian,Chen Si,Yu Yong Bo,Hong Jun-ming
Simultaneous pollution degradation and disinfection were seldom discussed in the field of electrocatalytic oxidation. In this work, N-doped graphene (N-GN) was selected as anode to ensure the high performance of paracetamol (APAP) degradation. With N doping, the activity of N-GN is evidently improved because of the better surface area, active defects, and conductivity compared with graphene. The generation of active chlorine and O 2 . − on the N-GN surface played an important role in APAP degradation. Compared with other operation parameters (such as pH and current density), environmental microorganisms exhibited more negative interference for APAP degradation. However, evident disinfection effects can be observed because of the release of fulvic and humic acids from microorganisms. In particular, active chlorine is evidently more effective than O 2 . − for disinfection. The simultaneous APAP degradation and disinfection observed in this research provided the possible technology of electrocatalytic oxidation via N-GN for practical application. Graphical Abstract
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Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 11
·6122-6128
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IF 12.732
Wenxiu Ma,Zhe Chen,Jun Bu,Zhenpeng Liu,Jinjin Li,Chen Yan,Lin Cheng,Lei Zhang,Hepeng Zhang,Jichao Zhang,Tao Wang,Jian Zhang
In pursuit of environmental friendliness and high economic efficiency, renewable energy-driven selective acetylene semihydrogenation under ambient conditions is urgently required but remains a grand challenge. Herein, we explore single-atom nickel (Ni) dispersed N-doped carbon (SA-Ni-NC) as a novel electrocatalyst for catalyzing selective acetylene semihydrogenation. In situ electrochemical Raman and theoretical investigations reveal that weak π-adsorption of ethylene on individual Ni sites in SA-Ni-NC facilitates its desorption and thus avoids its overhydrogenation. Eventually, under pure acetylene flow, SA-Ni-NC exhibits a high ethylene faradaic efficiency (FEethylene) of 91.3% and a large current density of −92.2 mA cm−2 at −0.6 V vs. the reversible hydrogen electrode (RHE). Even in crude ethylene stream containing 1% acetylene impurities (1 × 104 ppm), SA-Ni-NC still manifests a high acetylene conversion of 97.4% with a large space velocity (SV) of 2.4 × 104 mL gcat−1 h−1 and a high turnover frequency (TOF) of 22.9 h−1 for each Ni atom.
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Nanoscale
·
2021
·Vol. 14
·期 5
·1796-1806
·
IF 7.79
Wenyan Yin,Milin Zhang,Jingyuan Liu,Khaled Tawfik Alali,Jing Yu,Jiahui Zhu,Peili Liu,Rumin Li,Jun Wang
Electrochemical sensors using ionic liquids as electrolytes for oxygen detection are now getting more and more attention. Recently, an ionic liquid combined with an electrochemically active catalyst system has become popular for boosting the sensing performance of oxygen sensors. In this work, the imidazolyl-based ionic liquid 1-butyl-2,3-dimethylimidazole bis((trifluoromethyl)sulfonyl)imide [Bmmim][TFSI] is first prepared by a facile two-step method. Subsequently, a transition metal and N-codoped porous carbon oxygen reduction electrochemical catalyst Cu–N/C is synthesized by calcining the Cu-doped ZIF-8 precursor and then blending it in different ratios with the ionic liquid [Bmmim][TFSI] as composite electrolytes for oxygen detection. The composite electrolyte Cu–N/C/[Bmmim][TFSI] exhibits increased responses in cyclic voltammetry (CV) and chronoamperometry (CA) relative to that of the pure ionic liquid. Furthermore, the CV and CA data show that 6% Cu–N/C/[Bmmim][TFSI] has the optimum oxygen sensing response with an enhanced reduction peak current, a sensitivity of 0.1678 μA/[% O2] and a good linear fitting coefficient of 0.9991. In conclusion, the results confirm the success of using Cu–N/C as an electrochemical catalyst composed of the Cu–N/C/[Bmmim][TFSI] electrolyte for improving the responsivity, stability and sensitivity towards a wide range of oxygen concentrations.
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PubMed
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xue Li,Li-Juan Jian,Li Wang,Rong-Han Liu,Yun Zhao,Jiang-Tao Chen,Yan Li
Strategy of designing new-structured semiconductor photocatalysts with great electron-hole pairs separation is meaningful for improving the photocatalytic pollution abatement. Herein, on the basis of decahedral BiVO 4 with largely exposed (040) crystal facet, p-n hetero-nanostructured NiS@(040)-BiVO 4 catalysts with various molar ratio of NiS were fabricated by a facile two-step hydrothermal method to study the photo-degradation activities under visible-light irradiation. To photo-degrade anion methyl orange (MO), cation rhodamine B (RhB) and tetracyclines (TC), such nanostructures can all exhibit excellent photocatalytic activities . Compared with pure (040)-BiVO 4 and NiS nanoparticles , 0.6 M ratio of NiS@(040)-BiVO 4 possesses 8.6, 8.9 and 6.5 times higher photocatalytic capacity (MO: 98.6%, RhB: 99.1%, TC: 98.4%) and 49.2, 64.2 and 27.7 times faster photocatalytic rate (MO: 8.4060 h −1 , RhB: 8.2854 h −1 , TC: 7.6230 h −1 ). Detailed analyses show the superior light-harvesting, higher photocurrent response, excellent charge separation and improved charge transport properties are the main factors resulting the high efficient photocatalytic performance of NiS@(040)-BiVO 4 nanostructures. Besides, the forming of facet isotype heterojunctions between (040) and (220) lattice planes in BiVO 4 can also help to get more active photo-induced electrons for photocatalysis .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Tao Liu,Shuhan Liu,Yihan Shi,Zhuoran Zhang,Sheng Ding,Kexin Hou,Wen Zhang,Xin Meng,Fan Li
The ideal hemostatic agents should be able to stop bleeding quickly and avoid secondary bleeding caused by adhesion with blood clots during dressing change. Herein, a hydrophobic electrospun nanofiber membrane was prepared for achieving hemostasis , rationally targeting both attributes, via doping N -alkylated chitosan ( N -CS) grafted with octadecyl into chitosan/polyethylene oxide (PEO). In vitro and in vivo coagulation tests showed that CPNs doped with small amounts of N -CS (CPN31) could significantly shorten hemostasis time and promote the formation of more stable and stronger blood clots. In particular, the whole blood clotting time of CPN31 (58.8 ± 2.2 s) was significantly lower than that of chitosan/PEO (CPN0) nanofiber membrane (67 ± 3.5 s) and the medical sterile gauze (86.7 ± 0.6 s). Furthermore, due to the hemophobic nature of CPNs, blood wetting of the dressing was severely limited and blood can coagulated at the site of liver injury in rats, thus reducing blood loss and allowing rapid removal of the dressing without triggering secondary hemorrhage. The CPN31 exhibited excellent hemostasis properties, easy to remove, blood compatibility, biocompatibility and promoting fibroblast proliferation properties. This hydrophobic CPNs is a promising biological adhesive for hemorrhage control.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yang Guo,Haipeng Lu,Xian jian
Synthesizing lightweight, thin–profile, and high–performance microwave absorbers has emerged as an urgent research topic. A promising strategy for carbon–based materials to achieve these attributes is to rationally construct heterostructures. Herein, 0.89–1.54 at.% nitrogen(N)–doped carbon onion nanotube chains (NCONCs) were produced by blending CONCs harvested from candle combustion with HH 4 Cl and subjecting them to heating at 300–400 °C for 3 h. The hinge–like NCONCs revealed numerous electron transport paths, facilitating the formation of multi–tiered conduction networks. The N–doping introduced C–N groups and interfaces into the CONCs, which yielded extensive dipole and interfacial polarization. Simultaneously, the 1.14 at.% N–doping endowed NCONC–400 with suitable conductivity, thereby ensuring excellent impedance matching. The resulting synergistic effect of impedance matching and electromagnetic wave attenuation was clearly observed. Specifically, NCONC–400 exhibited exceptional performance with a maximum effective absorption bandwidth of 4.71 GHz and a peak reflection loss of –35.47 dB at 1.4 mm. The radar cross–section reduction demonstrated by NCONC–400 composites reached 21.43 dB cm 2 . These impressive results prove the distinctive advantages of CONCs in tailoring performance and optimizing impedance matching, which are appealing for lightweight and efficient microwave absorbers.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yunrui Zhang,Hong Zhang,Yinuo Zhao,Xingyan Han,Haijun Wang,Yongjun Gao
Boron and nitrogen co-doped carbon materials were synthesized by using sustainable chitin as precursor and boric acid as recyclable template. The carbon product possessing high surface area (1100–1400 m 2 /g) and micro- and mesoporous structure exhibited excellent catalytic activity in the oxidation of benzylic C H bond of ethylbenzene. Characterizations demonstrate that there are boron nitride (BN) bonds in carbon product achieved at higher calcining temperature. Experimental results and density functional theory (DFT) calculations suggest that the boron nitride domains locating in the carbocatalyst are essential to its catalytic activity. B dopants could anchor active oxygen-containing groups and then transfer oxygen atoms to substrate during the whole catalytic process.
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ACTA MATERIALIA
·
2023
·
IF 9.4
Yiqing Wei,Jingwei Li,Daliang Zhang,Bin Zhang,Zizhen Zhou,Guang Han,Guoyu Wang,Carmelo Prestipino,Pierric Lemoine,Emmanuel Guilmeau,Xu Lu,Xiaoyuan Zhou
Microstructure control is crucial for thermoelectrics since it is intimately related to the scattering mechanism of both electrons and phonons. Herein, we propose a new strategy to modify microstructure by phase regulation that simultaneously induces high carrier mobility and low lattice thermal conductivity . As demonstrated in layered SnSe 2 , the addition of Cu can induce a phase transition from space group P 3 ¯ m 1 to P 6 3 mc . Due to the enlarged formation energy of stacking faults in the later phase, the stacking fault density is greatly reduced after heat treatment that leads to an increased grain size . Accordingly, the carrier mobility of SnSe 1.97 Br 0.03 –3 % Cu sample is enhanced by 100 % at room temperature. Furthermore, the reduction of stacking fault density is accompanied by the formation of pores in the matrix, which results in low lattice thermal conductivity . As a result, a record peak zT of 1.13 for SnSe 2 -based materials is achieved at 773 K, and the attained ZT ave of 0.62 is a record-high value among n -type polycrystalline layered materials working in intermediate-to-high temperature region. This work provides a feasible strategy to decouple the electron and phonon transport in layered thermoelectric compounds by phase-dependent microstructure modification.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Jiayin Chen,Zeyun Cai,Weizong Bao,Tian Gao,Guoqiang Xie
The trade-off between strength and ductility is a prevalent issue in strengthening commercially pure titanium (CP–Ti). This study presents a method to prepare ultra-high strength Ti–N alloys with adequate ductility using ball-milling (BM) and spark plasma sintering (SPS) techniques, based on nitrogen solid solution and grain refinement strengthening. The effect of ball milling time of mixed powders on mechanical properties of Ti–N alloys was studied systematically. Quantitative analysis reveals that solid solution strengthening and grain refinement strengthening worked synergistically to enhance yield strength of alloys. The Ti–N alloys with the most favorable mechanical properties demonstrated a yield strength of 1606 MPa and a compressive plastic strain of 14.44 %. The development of novel Ti–N alloys provides a viable strategy for the advancement of high-performance titanium alloys using ubiquitous elements.
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