INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xiaowei Guo,Yang Yuan,Shanshan Li,Jingwen Wang,Zhengyu Bai,Lin Yang
Owing to the unique geometric and electronic structure, design and synthesis of electrocatalysts with well defined heterointerfaces are essential for clean energy technologies, for instance water-splitting and Zn-air batteries. Herein, a bifunctional electrocatalyst assembled by Co/MnO nanoparticles and nitrogen doping double-sphere carbon (denoted as Co/MnO@N-DSC), was fabricated via a solvothermal and pyrolysis strategy. The Co/MnO@N-DSC catalysts exhibit an enhanced bifunctional oxygen electrocatalytic performance for Oxygen reduction reaction (ORR) (E 1/2 , 0.84 V vs . RHE) and oxygen evolution reaction (OER) (E onset , 1.54 V vs . RHE). As an air cathode catalyst, the Co/MnO@N-DSC-based Zn-air battery can afford prime performance, over the commercial noble-metal-based Zn-air battery. Theoretical calculation results indicate that the synergism of Co (111)/MnO (200) heterointerfaces can enhance charge transfer and provide extra electrons for the reaction processes. This work provides a promising manoeuvre to uplift bifunctional catalytic activity by increasing the synergy from heterointerfaces of transition-metal/metal oxide in oxygen electrocatalysis .
研究领域:
能源材料
·
电催化
·
纳米材料
·
可再生能源技术
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Haiyang Zhang,Junchuan Wang,Ying Sun,Xueqin Zhang,Hong Yang,Baoping Lin
The exploration of an inexpensive, low-energy consumption and environmentally friendly preparation process to synthesize high capacitance performance MOF-based electrode materials is an important prerequisite for their commercialization. We propose a non-calcined strategy to synthesize nanowire microsphere shaped Co-BTC (CBNWM). Making MOF into one-dimensional nanowire structure can effectively increase its active sites and the ion transfer rate. After the MOF nanowires are entangle and reunite into microspheres, their mechanical property and chemical stability are improved. Therefore, compared with Co-BTC crystal (CBC), the electrochemical properties of CBNWM have been significantly improved. The specific capacity of CBNWM reaches 1020 F g −1 at 5 mV s −1 or 657 F g −1 at 0.5 A g −1 with the capacity remains 81.4% after 3000 cycles. Subsequently, a flexible asymmetric device of CBNWM//AC was fabricated, whose maximum energy density can achieve 34.4 W h kg −1 with the related power density of 375.3 W kg −1 .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2012
·Vol. 50
·期 23
·4871-4878
·
IF 3.919
Lijun Fan,Hou Chen,Zhihai Hao,Zhi Tan
A novel high oil-absorbing crosslinked gel was synthesized by copolymerization of butyl methacrylate (BMA) with a small amount of pentaerythritol triacrylate (PETA) crosslinker using single electron transfer-living radical polymerization (SET–LRP) initiated with carbon tetrachloride (CCl 4 ) and catalyzed by Cu(0)/hexamethylenetetramine (HMTA) in N, N-dimethylformamide (DMF). The polymerization followed first-order kinetics as indicated by linear increase of monomer concentration with reaction time. Effects of reaction temperature, crosslinker, initiator, and catalyst on the oil-absorbing properties of the crosslinked gel were investigated in detail. The oil absorptions of the crosslinked gel to chloroform, toluene could reach 51.9, 34.5 g/g, respectively. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
研究领域:
高分子化学
·
功能材料
·
环境修复
·
石油泄漏处理
·
聚合物科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 19
·3723-3733
·
IF 7.571
Qing Hao,Jinghong Wang,Jie Shen,Rong Gu,Yu Rao,Jian Feng,Huanhuan Wang,John L. Brash,Hong Chen
In analogy with adsorbed protein films, we have fabricated a family of 2D nanofilms composed of poly(N-vinyl caprolactam-co-vinylimidazole) (PNVCL) nanogels. NVCL was copolymerized with 1-vinylimidazole (VIM), and then cross-linked with α,ω-dibromoalkanes with 2 to 8 carbons via quaternization to form the nanogels. The swelling ratio of the gels was precisely controlled by regulating the inter-chain spacing of the polymers at the level of the carbon atom chain length of the cross-linker. The short-chain alkanes used are relatively rigid and their dimensions provide an accurate estimate of the chain spacing in the nanogels. It was shown that small differences in the carbon atom number of the cross-linking agent led to significant differences in the mechanical properties of the nanogels, in particular in the softness, deformability, and contact area (in film form), all of which increased with increasing carbon number. Films of the softer gels not only showed good adhesion to a number of substrates, but were also mechanically robust. In addition, the films showed excellent light transmission and nontoxicity to L929 cells. Nanogels of intermediate softness were shown to inhibit the adhesion of bacteria and human umbilical vein smooth muscle cells (HUVSMCs), and to be resistant to the adsorption of the plasma protein fibrinogen, indicating strong anti-biofouling properties. Gels that were either too stiff or too soft showed somewhat weaker anti-fouling activity in terms both of HUVSMCs adhesion and protein adsorption.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
生物材料
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Na Li,ChunYi Zhi,Haiyan Zhang
The preparation of high specific-capacity pseudocapacitive transition-metal-oxide/hydroxide (TMH) materials into transparent micro-structure electrodes is a great challenge and has become the bottleneck restricting the performance of transparent flexible supercapacitors . Beyond that, extending the operating voltage window is an urgent need for improving energy density . Here, Co(OH) 2 nanosheets and amorphous FeOOH nanowires were prepared into transparent films through a simple and scalable bio-inspired method at the air-solution interface. Both nanostructures are enwrapped in graphene shells (Co@Gr-TFandFe@Gr-TF) for use as transparent asymmetric pseudocapacitive electrodes. The unique encapsulation structures (1) provide pseudocapacitive electrode materials, especially an amorphous FeOOH structure cathode, (2) build up rapid three-dimensional electron and ion transport pathways together with the underlying ITO layer, (3) alleviate the exfoliation and dissolution of the active materials into electrolyte, and (4) extend the potential window of the FeOOH cathode from −0.8 ∼ 0 V to −1.2 ∼ 0 V with minimal cycling stability degradation. The asymmetric transparent and flexible supercapacitor based on Co@Gr-TF//Fe@Gr-TF operated at 1.8 V exhibits good transparency (50.5% at 550 nm), high specific capacitance (25.5 mF cm −2 , one order higher than the maximum value reported for FFT-GP), and high energy density (1.04 mWh cm −3 , comparable to that of nontransparent devices) as well as a long cycle life (10 000 cycles) with high-capacity retention (83.5%).
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
柔性电子学
·
功能薄膜
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55915
·
IF 2.7
Tianyuan Liu,Weihao Wang,Tian Yin,Zhikui Jiang,Zhichao Zhen,Guochun Yan,Junhui Ji
The application and promotion of biodegradable plastics are hindered by the imbalance between their mechanical and degradation performance imbalance, as well as high costs. Herein, a series of poly(ethylene adipate-co-terephthalate) (PEAT) copolyesters with excellent mechanical and degradation properties are synthesized by one-step melt polycondensation. The influence of the proportion of aliphatic groups in the molecular chain on the structure and properties, especially the degradation performance, of the copolyesters was studied. The molecular chain flexibility and degradability of PEAT increases with increasing of adipic acid content and decreasing of ET fragment length ( L ET ). The comprehensive mechanical properties of PEAT60 can be comparable to traditional packaging material poly(butylene adipateco-terephthalate) (PBAT). The degradation performance of PEAT can be adjusted the molecular chain structure. PEAT with L ET < 3 exhibit degradation performance, and PEAT with L ET < 2.2 exhibit significant degradation acceleration. The excellent mechanical and degradable properties of PEAT copolyester make it expected to be used in degradable packaging and other fields to help solve plastic pollution, while its lower cost will aid in the promotion of degradable materials.
研究领域:
材料科学
·
高分子化学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Jialu Wei,Jingyu Wang,Wei Zhang,Yuezhen Mao,Chunwen Sun
Graphical A ZAB with Co–N–C–PBMCRO cathodic catalyst achieves a remarkable cycling stability for 788 h. The perovskite Pr 0.5 Ba 0.5 Mn 0.8 Co 0.1 Ru 0.1 O 2.5+δ (PBMCRO) composite was constructed by in situ exsolved CoRu nanoparticles and Co–N–C with more exposing active sites. A conductive pathway for oxygen ions and electrons was built, thereby enhancing the electrochemical bifunctional properties. This rational design strategy shows great potential for facilitating synthesis of perovskite based catalysts for energy conversion and storage applications. Bifunctional catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are essential components of rechargeable zinc-air batteries. In this study, we synthesized a Pr 0.5 Ba 0.5 Mn 0.8 Co 0.1 Ru 0.1 O 2.5+δ (PBMCRO) perovskite composite with in situ exsolved CoRu nanoparticles and Co–N–C, functioning as an efficient bifunctional electrocatalyst for zinc-air batteries. The in situ exsolution of CoRu nanoparticles from the perovskite oxide was facilitated by the reducing action of 2-methylimidazole (2-MIM). Concurrently, Co–N–C was used to decorate PBMCRO, forming a novel bifunctional composite electrode of Co–N–C–PBMCRO. The incorporation of CoRu nanoparticles introduces a significant number of electrochemically active oxygen vacancies in the perovskite matrix, enhancing ORR and OER performance. Additionally, the Co–N–C synergistically improves electrochemical activity while preserving the structural stability of the perovskite oxide. The prepared Co–N–C–PBMCRO catalyst demonstrates significantly enhanced bifunctional performance compared to the undecorated pristine perovskite Pr 0.5 Ba 0.5 MnO 3−δ (PBMO). The zinc-air battery with Co–N–C–PBMCRO catalyst achieve a peak power density of approximately 90 mW/cm 2 and exhibit remarkable cycling stability for 788 h. This study presents a novel and effective strategy to enhance the catalytic performance of perovskite-based air electrodes for rechargeable metal-air batteries.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Xing Qian,Hongyu Liu,Yixuan Huang,Zejia Ren,Yating Yu,Chong Xu,Linxi Hou
Transition metal chalcogenides with yolk-shell nanostructures are a family of promising electrocatalytic materials with complex interior construction and remarkable structural tenability. In this work, a sequence of yolk-shell transition metal sulfide nanospheres (Co-Ni-MoS x , Co-MoS x and Ni-MoS x ) are prepared as superior Pt-free catalysts for dye-sensitized solar cells. This yolk-shell structure, consisting of a thin shell and an inner porous core, exposes more active sites and provides more contact regions between the electrolyte and catalyst. By comparing with the ternary Co-MoS x and Ni-MoS x nanospheres , the quaternary Co-Ni-MoS x nanospheres have advantages of the relatively larger surface area , favourable chemical composition , higher conductivity and excellent catalytic performance for expediting the reduction of I 3 − in solar cells. Particularly, as for Co-Ni-MoS x , a splendid power conversion efficiency of 9.76% is achieved under a standard irradiation, which is much better than that of Pt (8.24%).
研究领域:
材料科学
·
纳米技术
·
太阳能
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 13
·10744-10752
·
IF 2.324
Liu Changhai,Wang Ke,Zhang Jin,Zheng Xuerui,Liang Qian,Chen Zhidong
Developing low-cost, efficient, and bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is an attractive yet challenging task. Herein, we report a novel, simple and one-pot method to fabricate ultrafinely dispersed Co-CoO x nanoparticles encapsulated in a nitrogen doped carbon nanotubes (denoted as Co-CoO x /CN) via an efficient thermal condensation of d -glucosamine hydrochloride, melamine and Co(NO 3 ) 2 ·H 2 O. A well-designed Co-CoO x based hybrid that possesses high activity and excellent durability for the OER and HER in alkaline solution has been fabricated. The catalyst displays good stability for 30,000 s and small Tafel slope of 82 mV per decade for OER and 110 mV per decade for HER. Detailed electrochemical and physical studies indicate that the high OER and HER activity of the hybrid catalyst arises from the strong interaction between Co-based NPs and N-doped carbon nanotubes, and especially the synergistic effect of Co and cobalt oxide.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能量转换
·
催化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lichong Peng,Jiaona Wang,Shiquan Guo,Congju Li
Developing high-porosity, flexible non-noble metal oxygen electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) involving proton coupled electron transfer reaction is of essential importance for improving the efficiency of electrocatalysts. Herein, we propose a novel multilevel structure of Co/Co 3 O 4 -Ni/NiO doped macroporous interconnected hollow carbon nanofibers (Co/Co 3 O 4 -Ni/NiO@MHCNFs) as a self-standing and binder-free cathode catalyst for Li-O 2 batteries. We employed poly(styrene- co -acrylonitrile) (SAN) as a self-sacrificial template to fabricate hollow nanofibers by coaxial electrospinning and pyrolysis. Furthermore, macroporous interconnected hollow carbon nanofibers were achieved by fine-tuning the particle size of ZIF-8 and electrospinning parameters. Remarkably, as a proof-of-concept application, the Co/Co 3 O 4 -Ni/NiO decorated self-standing macroporous interconnected hollow carbon nanofibers (MHCNFs) electrodes exhibited significantly electrochemical performance, including a long-term cyclability (163 cycles) and maximum capacity (16623 mAh/g). This work rationally designs a scalable preparation of Co/Co 3 O 4 -Ni/NiO doped macroporous interconnected hollow carbon nanofibers, which provides a new idea for the design of self-supporting and binder-free oxygen electrocatalysts.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
Food Packaging and Shelf Life
·
2022
·
IF 8.749
Yibo Wang,Jie Zhang,Wei Li,Xiaoling Xie,Wenwen Yu,Lan Xie,Zhenzhen Wei,Ruijie Guo,Hong Yan,Qiang Zheng
Titanium dioxide (TiO 2 )/copper oxide (CuO) nanoparticles (NPs) were synthesized by co-precipitation method. The photocatalytic activities of TiO 2 were enhanced by the incorporation of CuO. The poly(butylene succinate-co-terephthalate) (PBST)-based nanocomposite (PTC) films were prepared via solvent casting method. Mechanical properties , UV-Vis light barrier, water vapor permeability ( WVP ), antibacterial properties, and preservation properties of composite films were evaluated. When the content of TiO 2 /CuO NPs was 3 %, the best overall properties of the film were obtained. The tensile strength and elongation at break reached maximum values of 35.6 ± 0.4 MPa and 590.7 ± 5.3 %, respectively. Meanwhile, the WVP values and UV-Vis transmittance of PTC-3 film decreased. The inhibition rates were close to 90 % against Staphylococcus aureus and Escherichia coli . Moreover, the PTC-3 film could extend the shelf life of cherry tomato after conducting preservation experiments for 18 days. Prepared PTC films had potential for food packaging.
研究领域:
材料科学
·
食品科学
·
纳米技术
·
聚合物科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·112507
·
IF 4.316
Yu Lei,Xianyun Zhang,Weiye Nie,Yifan Zhang,Qingqing Gao,Fangpu Gao,Zhixiang Li,Aihua Sun,Fenghua Liu,Yuchuan Cheng,Gaojie Xu,Jianjun Guo
Meniscus-confined electrodeposition (MCED) is an effective and versatile technique for fabrication of alloy structures with precise localization and high controllability. Here, the fabrication of cobalt-copper (Co/Cu) alloy microwires using MCED techniques is reported. Co/Cu microwires with a wide range of compositions (Co9Cu91 to Co100Cu0) and controllable morphology were printed using the co-electrodeposition mode from a single electrolyte. We utilized multiphysics finite element simulation to investigate the influence of electrolyte evaporation and electric field on the concentration distribution of metal ions in the meniscus. The concentration of ions at the substrate interface increases linearly with decreasing humidity and increasing current density, which can be used to fine turn the alloy composition. By further analyzing the alloy composition, we found that the electrodeposition of Cu is diffusion controlled, while Co is mainly electrochemical reaction controlled, as a results of combined action of surface evaporation and reaction dynamics in the meniscus. The prepared alloy wires are polycrystalline, dense and uniform composition distribution. The coercivity and magnetic anisotropy are enhanced by increasing of the copper content in the alloy wires. The high tunability of composition make this alloy a promising material for magnetic micro/nano-electromechanical devices.
研究领域:
材料科学
·
电化学
·
纳米技术
·
磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）