INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Yanhui Guo,Ruiqi Zhang,Weiju Hao,Jiankan Zhang,Yanjing Yang
The development of efficient and non-noble catalyst is of great significance to hydrogen generation techniques. Three surface-oxidized cobalt borides of Co–B–O@Co x B (x = 0.5, 1 and 2) have been synthesized that can functionalize as active catalysts in both alkaline water electrolysis and the hydrolysis of sodium borohydride (NaBH 4 ) solution. It is discovered that oxidation layer and low boron content favor the oxygen evolution reaction (OER) activity of Co–B–O@Co x B in alkaline water electrolysis. And surface-oxidized cobalt boride with low boron content is more active toward hydrolysis of NaBH 4 solution. An alkaline electrolyzer fabricated using the optimized electrodes of Co–B–O@CoB 2 /Ni as cathode and Co–B–O@Co 2 B/Ni as anode can deliver current density of 10 mA cm −2 at 1.54 V for overall water splitting with satisfactory stability. Meanwhile, Co–B–O@Co 2 B affords the highest hydrogen generation rate of 3.85 L min −1 g −1 for hydrolysis of NaBH 4 at 25 °C.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 4
·729-734
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IF 1.071
Zhu Changliang,Liu Shaoying,Wang Qingyin,Zhang Hua,Wang Gongying
Poly(butylene carbonate)(PBC) has significantly promising applications as a degradable material in the field of polymers, while its poor thermal performance and low crystallization rate are its main defects. To overcome these shortcomings, a series of poly(butylene carbonate-co-spirocyclic carbonate)(PBSC) copolymers were synthesized from diphenyl carbonate, 1,4-butanediol and spiroglycol via two-step polycondensation reactions, using magnesium oxide as a catalyst. Differential scanning calorimetry(DSC) results indicated that the glass transition temperature( T g ) values of PBSC copolymers were enhanced from −19 °C to 56 °C with rising the spiroacetal moiety content. Thermogravimetric analysis(TGA) results showed that the resulting PBSCs have a higher thermal stability than that of poly(butylene carbonate). Wide angle X-ray diffraction(WXRD) patterns were characterized to investigate the crystallization behaviour of PBSCs. Tensile testing demonstrated that copolymerization of spiroacetal moieties into PBC chains imparted PBSC with favourable mechanical performance. Typically, PBSC30 had a tensile modulus of (1735±430) MPa, a tensile strength of (42±5) MPa and an elongation of 504%±36%.
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RSC Advances
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2018
·Vol. 8
·期 50
·28684-28691
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IF 2.936
Ka Wang,Weilan Guo,Shancheng Yan,Haizeng Song,Yi Shi
The traditional method of preparing hydrogen and oxygen as efficient clean energy sources mainly relies on the use of platinum, palladium, and other precious metals. However, the high cost and low abundance limit wide application of such metals. As such, one challenging issue is the development of low-cost and high-efficiency electrocatalysts for such purposes. In this study, we synthesized Co–FeS2/CoS2 heterostructures via a hydrothermal method for efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Benefitting from their unique three-dimensional hierarchical nanostructures, Co-doped FeS2, and CoS2 formed heterostructures on Co–FeS2 petals, which bestowed remarkable electrocatalytic properties upon Co–FeS2/CoS2 nanostructures. Co–FeS2/CoS2 effectively catalyzed the OER with an overpotential of 278 mV at a current density of 10 mA cm−2 in 1 M KOH solution, and also is capable of driving a current density −10 mA cm−2 at an overpotential of −103 mV in 0.5 M H2SO4 solution. The overpotential of the OER and HER only decreased by 5 mV and 3 mV after 1000 cycles. Our Co–FeS2/CoS2 materials may offer a promising alternative to noble metal-based electrocatalysts for water splitting.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2018
·
IF 3.046
Jing Wang,Xinyue Hu,Yuexing Li,Huimin Wen,Zhili Zuo,W.A. Muhammad,John Q. Xiao,Jun Hu
Magnetic nanowire arrays grown in anodized alumina templates offer a fertile ground to investigate the interplay among the exchange interaction, dipolar interaction, and magnetocrystalline anisotropy. In this study, we have successfully fabricated Co nanowire arrays with gradient diameter while maintaining the nanowire separation. Consequently, we are able to obtain nanowire arrays with dominant exchange interaction at one end with small nanowire dimeter and dominant dipolar interaction at the other with large nanowire diameter. These samples show very different magnetic properties from those observed in magnetic nanowire arrays with uniformly diameter. The easy magnetization axis, coercivity, saturation field, and reversal processes are all controlled collectively by both ends of the nanowires, which cannot be viewed as the combination of magnetic nanowire arrays with thin and thick diameters.
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RSC Advances
·
2014
·Vol. 5
·期 12
·9130-9137
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IF 3.708
Jiahuan Lei,Yu Liu,Xinyu Wang,Pan Hu,Xinsheng Peng
Au nanoparticles/mesoporous CuO nanosheets were successfully synthesized by the assembly of negatively charged AuCl4−1 and positively charged CuO nanosheets using sodium citrate and thermal reduction, respectively. The structure and morphology were characterized in detail. Both the loading amount of Au nanoparticles and the performance were controlled by the reduction process. The resulting Au/CuO NSs exhibited good catalytic activity for CO oxidation and good non-enzymatic sensitivity for glucose.
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MATERIALS & DESIGN
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2015
·
IF 3.501
Hongyao Ding,Hongyan Tang,Feng Wang,Huapeng Zhang,Yuhai Guo
Butyl methacrylate (BMA)/acrylamide (AM) (co)polymers were synthesized through free radical bulk copolymerization by two steps. Effect of synthesis process on the molecular structure and properties of BMA/AM (co)polymers was deeply investigated. 13 C NMR results indicated that AM only participated in copolymerization with BMA, which would be promoted under a higher prepolymerization temperature. A higher conversion ratio of AM could be obtained by batch feeding. FTIR results showed that a higher prepolymerization temperature or batch feeding could increase the content of AM unit in the BMA/AM (co)polymers. DMA results indicated that a higher prepolymerization temperature or batch feeding would induce a higher Tg value of the BMA/AM (co)polymer. DSC and TGA results showed a weight loss at 150–250 °C because of the imidization reactions, which would be increased by a higher prepolymerization temperature or batch feeding. Mechanical properties of PMI foam would increase under a higher prepolymerization temperature or batch feeding. In a word, the molecular structure and properties of the BMA/AM (co)polymers could be controlled.
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Materials Science & Engineering C-Materials for Biological Applications
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2016
·
IF 3.42
Zhikai Tan,Hongjie Wang,Xiangkai Gao,Tong Liu,Yongjun Tan
There is an increasing demand for functional small-diameter vascular grafts (diameter < 6 mm) to be used in clinical arterial replacement. An ideal vascular graft should have appropriate biomechanical properties and be biocompatible. Electrospinning has become a popular polymer processing technique for vascular tissue engineering, but the grafts fabricated by electrospinning often have relatively small pores and low porosity, which limit cell infiltration into scaffolds and hinder the regeneration and remodeling of grafts. In the present study, we aimed to develop an efficient method to prepare electrospun composite vascular grafts comprising natural and synthetic materials. We fabricated grafts made of polycaprolactone, gelatin, and polyvinyl alcohol (PVA) by co-electrospinning, and the scaffolds were further functionalized by immobilizing heparin on them. The PVA fibers degraded rapidly in vivo and generated electrospun scaffolds with high porosity, which significantly enhanced cell proliferation and infiltration. The mechanical properties of the grafts are suitable for use in artery replacement. Heparin functionalization of the grafts yielded a good antithrombogenic effect, which was demonstrated in platelet adhesion tests. Moreover, in vitro and in vivo results demonstrated that the heparin release from the grafts enhanced the growth of endothelial cells, which is important for the endothelium of implanted grafts. The results of this study indicate that our method is effective and controllable for the fabrication of vascular grafts that meet the clinical requirements for blood vessel transplantation.
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MATERIALS & DESIGN
·
2016
·
IF 3.997
Yuhua Yan,Yanping Tian,Meifeng Hao,Yuqing Miao
The cross-like crystallines of Ni-Co-P microcomposites were synthesized via a simple hydrothermal method under high pressure and temperature which is adapted from the classical electroless deposition technique for surface modification. Here hypophosphite was employed as reductant and phosphorus resource to prepare the composites of Ni, Co and P elements. The obtain Ni-Co-P microcomposites were characterized in morphology, composition and properties. They show the perfect cross-like shape with an approximate stoichiometry of Ni 12 -Co 6 -P 12 -O 70 . The high absorbance in UV area and wide absorbance in vis area are observed. They also exhibit superparamagnetic behavior and hydrogen evolution property.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xinghang Duan,Qiaolin Li,Tiantian Cao,Shengxiang Xiong,Gang Chen,Chengjun Dong,Hongtao Guan,Zongyou Yin
The development of advanced electromagnetic (EM) wave absorbers is crucial for applications in stealth technology and EM interference shielding. A major challenge in this field is achieving high absorption efficiency across a broad frequency range while maintaining lightweight and structurally robust materials. In this study, we successfully developed a precise and flexible synthesis strategy to prepare hollow C/Co/Mo2C cubes using Zn/Co(C4O4)(H2O)2 as a flexible template, which offers the advantages of simultaneous removal and easy control of metal Co content. The shell of the hollow cubes can be further optimized by changing the oxidizer content for polypyrrole (PPy). At optimum shell thickness and Co content, the C/Co/Mo2C-0.4 composites, featuring hollow but perforated structures, exhibit superior EM wave absorption properties, with a minimum reflection loss (RLmin) of −73.46 dB and an effective absorption bandwidth (EAB) of 5.20 GHz at 2.0 mm with 15 wt% filler. Detailed investigations reveal that the hollow C/Co/Mo2C-0.4 cubes provide polarization loss, conduction loss, magnetic loss, and optimal impedance matching characteristics, significantly enhancing EM wave absorption performance. This work offers a promising strategy for assembling multiple components into a hollow architecture, offering superior molybdenum carbide microwave absorbers.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Yong Zhang,Haotian Xiong,Qingdong Chen,Mingcong Tang,Zijian Wang,Jingdu Bian,Dongzhi Zhang
In the automotive industry, improper handling and excessively high temperatures can lead to the failure of lithium-ion batteries. Early failure of lithium batteries can produce trace amounts of gases, such as carbon monoxide (CO) and carbon dioxide (CO2). In this study, hollow spherical nickel oxide (NiO) was prepared using a carbon sphere template method and then combined with Ti3C2Tx (MXene). Most of the NiO hollow spheres had a diameter of about 700 nm. By variation of the ratio of MXene, a carbon monoxide sensor was fabricated, enabling the detection of CO at room temperature. The surface morphology and elemental composition of the materials were analyzed. Experimental and characterization results show that the NiO/MXene composite exhibits faster response/recovery times, higher sensitivity, and better selectivity to CO. The response time of NiO/MXene to 400 ppm of CO is only 8 s, and the recovery time is 16 s. The sensor’s sensitization mechanism was explained through first-principles calculations. This sensor can be applied in lithium battery status monitoring and fault warning systems.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Wang Qiyou,Luo Tao,Cao Xueying,Gong Yujie,Liu Yuxiang,Xiao Yusen,Li Hongmei,Gröbmeyer Franz,Lu Ying-Rui,Chan Ting-Shan,Ma Chao,Liu Kang,Fu Junwei,Zhang Shiguo,Liu Changxu,Lin Zhang,Chai Liyuan,Cortes Emiliano,Liu Min
Single-atom catalysts (SACs) have received increasing attention due to their 100% atomic utilization efficiency. The electrochemical CO 2 reduction reaction (CO 2 RR) to CO using SAC offers a promising approach for CO 2 utilization, but achieving facile CO 2 adsorption and CO desorption remains challenging for traditional SACs. Instead of singling out specific atoms, we propose a strategy utilizing atoms from the entire lanthanide (Ln) group to facilitate the CO 2 RR. Density functional theory calculations, operando spectroscopy, and X-ray absorption spectroscopy elucidate the bridging adsorption mechanism for a representative erbium (Er) single-atom catalyst. As a result, we realize a series of Ln SACs spanning 14 elements that exhibit CO Faradaic efficiencies exceeding 90%. The Er catalyst achieves a high turnover frequency of ~130,000 h − 1 at 500 mA cm − 2 . Moreover, 34.7% full-cell energy efficiency and 70.4% single-pass CO 2 conversion efficiency are obtained at 200 mA cm − 2 with acidic electrolyte. This catalytic platform leverages the collective potential of the lanthanide group, introducing new possibilities for efficient CO 2 -to-CO conversion and beyond through the exploration of unique bonding motifs in single-atom catalysts.
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Xu Wang,Quan Gao,Yongfa Zhou,Zhihan Wang
Sustainable cellulose has attracted considerable attention in the field of renewable supercapacitor owing to its low-cost and lightweight properties. However, it is still a challenge to enhance their electrochemical performance. Here, nitrogen (N) and phosphorous (P) co-doped carbon aerogels derived from cellulose were synthesized via the sol-gel-lyophilization-carbonization method. Their structures were determined by scanning electron microscopy (SEM), nitrogen sorption isotherm, and X-ray photoelectron spectroscopy (XPS). The N/P co-doped carbon aerogel exhibited significantly enhanced porous surface properties, and the increasing contents of the N and P could provide more defects and active sites. Therefore, the sample achieved a high specific capacitance of 235.5 F g −1 at 0.5 A g −1 , while also demonstrating good retention of specific capacitance with 62.6 % of initial capacitance at 20 A g −1 . The electrode exhibited 87 % capacitance retention and an excellent coulombic efficiency of close to 100 % after undergoing 10,000 cycles at a current density of 6 A g −1 . Overall, the synthesized cellulose carbon aerogels, modified through doping engineering, have been identified as a promising candidate for supercapacitor electrodes.
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