Molecular Catalysis
·
2023
·
IF 4.6
Kexin Huang,Yanxing Hui,Zhongyun Yang,Muhammad Waqas,Fangfang Fan,Limin Wang,Xiaotian Liu,Qiulan Huang,Dujuan Huang,Du-Hong Chen,Youjun Fan,Wei Chen
Electrochemical energy (e.g., fuel cell and metal-air batteries) is featured by large theoretical energy density, high conversion efficiency, safe operation and pollution-free emission. However, the sluggish dynamics of oxygen reduction reaction (ORR) and high cost of noble metals hinder their widespread commercial applications in electrochemical energy devices. Herein, we present a method for the preparation of the N, S co-doped carbon film wrapped Co nanoparticles (Co/NSC) for ORR by aging and then pyrolyzing the mixture of cobalt salt and 1-(p-Toluenesulfonyl)imidazole. The co-doping of N and S facilitates the electron rearrangement of the carbon film, resulting in a rapid electron transfer. The core-shell structure enhances the interaction between N, S co-doped carbon film and Co nanoparticles. These features endow the Co/NSC catalyst an excellent ORR with a half-wave potential of 0.860 V and limiting current density of 6.2 mA cm -2 , besides the superior anti-methanol. The Co/NSC catalyst as the air cathode grants the assembled zinc-air battery high open circuit voltage (1.467 V), large peak power density (156.2 mW cm -2 ), great specific capacity (747.9 mAh g Zn -1 ), and excellent stability. Thus, the prepared Co/NSC catalyst exhibits a promising application in zinc-air battery. This work provides an approach for the synthesis of the carbon-shell coated non-noble metal catalyst and its subsequent applications in oxygen electrocatalysis.
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EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Huizi Zhang,Xu Zhao,Xiyue Wang,Yuchao Li,Shuangshuang Wang
Developing polyolefin microporous membranes with good antifouling ability and high separation efficiency is an important and urgent work. Herein, polypropylene microporous membranes (PP (mm)) containing zwitterionic polymer was prepared by grafting poly (sulfobetaine methacrylate) (PSBMA) onto the membrane via N-hydroxyphthalimide(NHPI) catalysis and activators regenerated by electron transfer atom transfer radical polymerization (ARGET-ATRP) for the first time. The structure, morphology, hydrophilicity and antifouling ability of PP (mm)-g-PSBMA was systematically studied. Water contact angle of the modified membrane could be sharply reduced at a proper grafting degree (GD), and it exhibited extraordinary hydrophilicity. The PP (mm)-g-PSBMA membrane also showed excellent protein antifouling ability and higher water flux compared to that of pristine PP membrane. Flux recovery ratio (FRR) of PP (mm)-g-PSBMA was increased to 93.1 % and relative flux reduction ratio (RFR) was decreased to 25.3%. This work presents a controllable and high efficiency strategy to polyolefin separation membrane for high value products.
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Journal of the Australian Ceramic Society
·
2023
·Vol. 59
·期 5
·1231-1239
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IF 1.9
Zhang Mengwen,Jiang Binyang,Yang Lutong,Cao Na,Li Zhaosheng,Fan Lei,Yang Shoulei
The emerging oscillatory pressure sintering technology is used to prepare high-performance Al 2 O 3 -Ti(C,N) ceramic tools for high-speed cutting. By recording the displacement during sintering, the sintering shrinkage rate of the Al 2 O 3 -Ti(C,N) composite was calculated, and the stress exponent n and sintering activation energy Q were calculated according to creep theory to determine the densification mechanism. In addition, the evolution of phases, microstructure and hardness of the composite was also observed. Results show that during oscillatory pressure sintering process at 1400 °C and 1300 °C, the stress exponent of Al 2 O 3 -Ti(C,N) composite is around 2.2 and the sintering activation energy is 486 kJ mol −1 , indicating that the densification mechanism is a diffusion-controlled grain boundary sliding of Al 2 O 3 phase. Additionally, as the oscillatory pressure increases, the average grain size of the Al 2 O 3 decreases and the Vickers hardness increases. Hardness achieves the highest 22.7 GPa when the median oscillatory pressure is 70 MPa at 1400 °C, which is 1 GPa higher than that of static pressure of 70 MPa.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Jin Du,Shuwei Liang,Meidi Wang,Yuhan Wang,Tianpei Yi,Zhiming Zhang,Fusheng Pan,Zhongyi Jiang
Facilitated transport membranes is a promising strategy to fabricate efficient separation membranes for aromatic/aliphatic mixtures. However, building up selective channels with uniformly distributed facilitated transport sites is still challenging. In this study, Cu-TAPB-COF (CuCOF) nanosheets , a kind of metal-covalent organic frameworks (MCOFs), were synthetized and introduced into poly (ether-block amide) (Pebax®2533) matrix to construct facilitated transport membranes for toluene/ n -heptane mixtures. As the aromatic skeleton linked by covalent interaction, CuCOF could provide continuous low mass transfer resistance channel. And Cu(I) exist in skeleton could serve as uniformly distributed facilitated transport sites and maintain a long-term stability. The resulting membrane exhibited a higher adsorption selectivity and lower swelling degree compared with pure Pebax membrane. The membrane exhibited high pervaporation separation performance for 50 wt% toluene/ n -heptane mixture. When the filling contents of CuCOF was 2.0 wt%, the membrane achieved a permeation flux of 937 g m −2 h −1 and the separation factor of 4.7.
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JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Longhua Sun,Xiaodong Meng,Jie Zhang,Yongqiang Meng,Manyun Wang,Xueqin Zhou,Chao Chen,Ji Zhou,Christopher W. Bielawski,Jianxin Geng
The hybridization of carbon materials with metal compounds is a promising approach for designing advanced composites. However, the standard methodologies are often limited in practical terms by the complicated synthetic routes and/or an inability to control the structures of the resulting materials. Herein, we describe a one-pot strategy for synthesizing a N-doped porous graphitic carbon that is hybridized with oxygen-doped titanium nitride (designated O–TiN@N-PGC) and show that the composite displays outstanding chemisorption and electrocatalytic effects in sulfur cathodes. The method employs urea as nitrogen source and thus avoids the use of dangerous and toxic ammonia gas. The unique structure of O–TiN promotes the electrocatalytic conversion of sulfur species found in sulfur cathodes. Li–S cells that are prepared using the O–TiN@N-PGC as a sulfur host exhibit remarkable performance in terms of specific capacity (1408 mA h g −1 at 0.1 C), rate capacity (604 mA h g −1 at 4 C), and cycling stability (513 mA h g −1 after 1000 cycles at 0.5 C). Moreover, an areal capacity of 7.6 mA h cm −2 is achieved under a high sulfur loading of 5.7 mg cm −2 . The results establish a facile and efficient strategy for integrating metal nitrides in porous carbons , particularly for use in contemporary energy technologies.
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RARE METALS
·
2023
·Vol. 42
·期 7
·2284-2293
·
IF 8.8
Du Juan,Lin Qin-Yan,Zhang Jian-Qi,Hou Sen-Lin,Chen Ai-Bing
Herein, we successfully prepare highly dispersed and uniform small nano-size nickel nanoparticles embedded on core–shell carbon spheres by confined-deposition method. The mesoporous silica layer containing surfactant coated on the surface of the polymer sphere provides confined space and effectively controls the growth of nickel nanoparticles during pyrolysis. At the same time, the introduction of nickel species has an impact on structure of the obtained carbon spheres, and it can promote the deposition of carbon to realize the adjustment from hollow to core–shell and then to solid spheres. Owing to the uniform distribution of Ni nanoparticles with small size, mesoporous structure, N-doping groups, high specified surface areas, and core–shell structure, the obtained catalyst shows exciting ability for the production of CO by reduction of CO 2 with a maximum CO Faradaic efficiency of 98%, indicating its promising prospect in electro-reduction of CO 2 . Graphical Abstract
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MOLECULES
·
2023
·Vol. 28
·期 12
·4633
·
IF 4.6
Yuyi Liao,Zhongtao Shang,Guangrui Ju,Dingke Wang,Qiao Yang,Yuan Wang,Shaojun Yuan
Developing advanced carbon materials by utilizing biomass waste has attracted much attention. However, porous carbon electrodes based on the electronic-double-layer-capacitor (EDLC) charge storage mechanism generally presents unsatisfactory capacitance and energy density. Herein, an N-doped carbon material (RSM-0.33-550) was prepared by directly pyrolyzing reed straw and melamine. The micro- and meso-porous structure and the rich active nitrogen functional group offered more ion transfer and faradaic capacitance. X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) measurements were used to characterize the biomass-derived carbon materials. The prepared RSM-0.33-550 possessed an N content of 6.02% and a specific surface area of 547.1 m2g−1. Compared with the RSM-0-550 without melamine addition, the RSM-0.33-550 possessed a higher content of active nitrogen (pyridinic-N) in the carbon network, thus presenting an increased number of active sites for charge storage. As the anode for supercapacitors (SCs) in 6 M KOH, RSM-0.33-550 exhibited a capacitance of 202.8 F g−1at a current density of 1 A g−1. At a higher current density of 20 A g−1, it still retained a capacitance of 158 F g−1. Notably, it delivered excellent stability with capacity retention of 96.3% at 20 A g−1after 5000 cycles. This work not only offers a new electrode material for SCs, but also gives a new insight into rationally utilizing biomass waste for energy storage.Keywords:biomass;supercapacitors;nitrogen doping;melamine;porous carbon
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APPLIED PHYSICS LETTERS
·
2023
·Vol. 122
·期 18
·
IF 4
Xu Baoyin,Du Haozhe,Yang Bin,Ding Zhanhui,Wang Xiancheng,Wang Yanchao,Li Ziheng,Li Yongfeng,Yao Bin,Ma Hong-An,Lan Yucheng
The exploration of novel ultrawide bandgap (UWBG) semiconductors is becoming a challenging and compelling research focus on semiconductor physics, materials, and device applications. Ternary B–C–N compounds have attracted much attention because their electronic structure and semiconductor properties are quite different depending on the chemical composition and atomic arrangement of boron, carbon, and nitrogen elements in the lattice. However, the lack of well-controlled high-quality B–C–N crystals has limited their potential as UWBG devices. In this study, B–C–N compounds are synthesized in bulks from graphite and hexagonal boron nitride ( h -BN) using ball milling and high-pressure high temperature technique. The synthesized B–C–N compounds produced are highly crystallized layered-materials with intercalated graphene layers in C-doped h -BN layers. The doped carbon atoms occupy boron sites and nitrogen sites of the h -BN layers unbalanced, giving rise to the n -type conductivity of the B-C-N layered compounds. The measured optical bandgaps range from 3.4 to 6.0 eV, which can be regulated by the carbon content. Their electronic properties are also tunable. Our work is expected to initiate potential applications of the B–C–N material as UWBG semiconductors.
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FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Hao Qin,Nengjie Feng,Quan Lv,Hui Wan,Guofeng Guan
Single atomic catalysts (SAC) isolated in zeolite have been reported for hydroisomerization of n-alkanes. However, it is widely found that metal species located outside zeolite crystals have beneficial effects on catalytic performance, rather than inside zeolite. Herein, we introduce cerium oxide as a binder to anchor Pt single atoms on the catalyst surface . Pt species were atomically dispersed on catalyst surface certified by AC HAADF-STEM and XAS. Pt 1 @CeO x /SAPO-11 not only shows significant activity but also effectively inhibits the selectivity of cracking or hydrogenolysis . The turnover frequency value of 0.05%Pt 1 @CeO x/ SAPO-11 reaches 9511 h −1 , 13 times higher than reported catalyst prepared with the space-confined strategy. Reaction mechanisms have been proposed to explain the different effects of platinum status and location on the reaction. Platinum single atoms located outside the catalyst crystal are speculated more favourable to this reaction. Conceptually, catalytic efficiency of this reaction can be improved by dispersing the active sites to reduce the local concentration of the product of a reversible step in an intermediate reaction. An appropriate loading of 0.05 wt% is needed to achieve the high efficiency of the metal and acid sites simultaneously.
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Advanced Materials Interfaces
·
2022
·Vol. 10
·期 4
·2201817
·
IF 6.389
Junfeng Zhang,Haotian Liu,Weikang Zhu,Bin Chen,Runfei Yue,Shuoyao Yin,Na Xie,Ran Li,Yan Yin
The design of the efficient, flexible air electrode for enhancing the Zn-air batteries (ZABs) performance is vital in developing a new portable rechargeable power supply. Emerging research indicates that non-precious metal materials have promising activity for oxygen reduction/evolution in alkaline conditions while constructing a high-performance and reliable electrode is still a big challenge at the present stage. In this work, a bimetal doped zeolitic imidazolate framework (ZIF) film is synthesized by fast current-driven synthesis (FCDS) on a thin carbon nanotube film (CNTF). After carbonization at 950 °C, CoFe-N-C nanofoam formed on the CNTF, resulting in binder-free, flexible electrodes. It exhibits excellent activity and stability toward oxygen reduction and evolution. The CoFe-N-C/CNTF-based liquid-state ZAB shows an output power density of 294 mW cm −2 . When applied in solid-state ZAB, the flexible battery shows high power density and excellent cycling stability.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Linlu Shen,Pengwei Yan,Jimin Shen,Jing Kang,Yang Shen,Binyuan Wang,Shengxin Zhao,Yingxu Gong,Yabin Li,Yizhen Cheng,Shuyu Wang,Zhonglin Chen
In this study, bromide ion (Br − ) was found to accelerate the degradation of N , N -dimethylhydrazine compounds in peroxymonosulfate (PMS) oxidation and synchronously reduce their N -Nitrosodimethylamine (NDMA) formation. Hexamethylenebis (1,1-dimethylsemicarbazide) (HDMS) and daminozide (DMZ) were selected as the model compounds to clarify the mechanisms in the presence or absence of Br − for the PMS batch oxidation experiments. In the absence of Br − , the degradation of the model compounds accompanied by the formation of NDMA was induced by the electron transfer between PMS/singlet oxygen ( 1 O 2 ) and the (CH 3 ) 2 N-N- groups of the model compounds. In the presence of Br − , the generated hypobromous acid (HOBr) was verified to account for the acceleration of the reaction. The difference in NDMA formation in PMS oxidation and PMS/Br − oxidation was related to the changes in degradation paths. The electron-withdrawing substituents Br or O of PMS or HOBr substituted the N atoms of the model compounds, generating brominated or oxidation products that were hard to be further oxidized, thus decreasing NDMA formation. Moreover, the toxicity of the products in PMS/Br − oxidation was significantly lower than in alone PMS oxidation. This work provides new insight into the unique advantage of Br − during PMS oxidation.
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International Journal of Nanomedicine
·
2023
·
IF 8
Qian Yu,Chentao Shen,Xiangsheng Wang,Zhenxing Wang,Lu Liu,Jufang Zhang
Purpose We aimed to develop an antioxidant dressing material with pro-angiogenic potential that could promote wound healing. Gelatin (Gel) was selected to improve the biocompatibility of the scaffolds, while graphene oxide (GO) was added to enhance their mechanical property. The loaded N-Acetyl cysteine (NAC) was performing the effect of scavenging reactive oxygen species (ROS) at the wound site.Materials and Methods The physicochemical and mechanical properties, NAC releases, and biocompatibility of the NAC-GO-Gel scaffolds were evaluated in vitro. The regeneration capability of the scaffolds was systemically investigated in vivo using the excisional wound-splinting model in mice.Results The NAC-GO-Gel scaffold had a stronger mechanical property and sustainer NAC release ability than the single Gel scaffold, which resulted in a better capacity for cell proliferation and migration. Mice wound-splinting models revealed that the NAC-GO-Gel scaffold effectively accelerated wound healing, promoted re-epithelialization, enhanced neovascularization, and reduced scar formation.Conclusion The NAC-GO-Gel scaffold not only promotes wound healing but also reduces scar formation, showing a great potential application for the repair of skin defects.
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