CRYSTENGCOMM
·
2023
·Vol. 25
·期 48
·6814-6821
·
IF 3.1
Lihui Xu,Juan Xu,Xin Wang,Xingzhong Zhu,Caixia Kan
The hydrogen evolution reaction (HER) must use a catalyst to reduce the overpotential and accelerate the chemical reaction of the electrolysis process. Pt stands out because of its very good catalytic properties. However, the extremely low content of Pt in the Earth's crust and the high price of Pt severely limit the large-scale use of this precious metal. In order to reduce the use of Pt and enhance catalytic activity, we designed a composite structure by combining the plasmon effect characteristics of Au with Pt particles. In this work, we investigated the synthesis and growth mechanism of Au@Pt nanostars with gold nanostars (Au NS) as the core, and explored the application efficiency of Au@Pt nanostars in photocatalysis. The Au NS were produced by a “one-step synthesis”, and the Au@Pt nanostars were synthesized by growing Pt on the nanostar surface. More branched Au NS formed catalysts with Pt clusters for metal ionization enhancement. The catalytic activity of the structure was increased by the presence of Pt. The synergistic advantages of the heterogeneous composite nanostructures mean the structures have high photoelectrocatalysis activity at the edge and corner positions. Benefiting from the synergistic effect and the plasmon-induced accelerated molecular transformations, the Au@Pt nanostars manifest outstanding plasmon-enhanced electrochemical activity toward the HER with a low overpotential of 23.08 mV for achieving the current density of 10 mA cm−2, which surpasses the commercial Pt/C catalyst. At the same time, the Au NS also exhibit excellent photocatalytic performance with a smaller initial overpotential (ΔV = 9.03 mV) than that in the absence of light. This shows that the study of this structure can be used for the development and application of new energy and hydrogen energy.
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Journal of Energy Storage
·
2023
·
IF 9.4
Dongyu Pei,Hanbo Wang,Jinpeng Bao,Yiduo Li,Yuxing Yan,Sheng Wan,Zhenlu Wang,Haiyan Lu
While the study on the aqueous asymmetric capacitor of activated carbon/copper oxide has reached a relatively mature stage, further progress in the technology relies on overcoming specific issues. This paper proposes and eliminates a detrimental crosstalk between the CuO cathode and AC anode , which impairs the cyclic performance of capacitor. During the charging process, Cu 2+ dissolves from the CuO cathode and deposits as Cu/Cu 2 O crystals on the surface of AC anode. These deposits obstruct the pores of activated carbon and then diminish the specific surface area of the electric double layer , consequently decreasing capacitance performance of capacitors. The capacitors demonstrate a remarkable enhancement in cycle life by adding an anion exchange membrane between two electrodes to shut off this crosstalk. After 10,000 cycles at 1 A g −1 , the capacity retention rate of AC/CuO capacitors is increased by 36.6 %, reaching 94.1 %. Even at higher current densities , the capacitors maintain superior cyclic stability. This study is a significant stride in aqueous asymmetric capacitors.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yaxin Zhang,Shanchen Yang,Ying-Jie Zhu,Dandan Li,Long Cheng,Heng Li,Zhaohui Wang
As an emerging electrochemical device , aqueous zinc-ion batteries (ZIBs) present promising potential in safe and large-scale energy storage. However, the large pores of commercial glass fiber (GF) separators result in uneven Zn 2+ ion flux , leading to severe dendrite growth issues of Zn metal anodes. Herein, we integrated a multifunctional layer on the GF separator that can synergistically regulate the pore feature and surface property of commercial GF separators. Such modification layer, composed of nanocellulose and SiO 2 nanoparticles , exhibited uniform nanoporous structure and abundant negatively charged polar functional groups. These features allow regulating the distribution of Zn 2+ ions at the separator-anode interface, facilitating stable and uniform Zn nucleation and growth. Moreover, the electrostatic interaction between the negatively charged functional groups and Zn 2+ ions enhanced the Zn 2+ ion transport kinetics, preventing the Zn dendrites formation and adverse reactions. Consequently, the modified electrolyte-filled GF separator showed an increased Zn 2+ ion transference number of 0.65. The symmetric Zn//Zn batteries utilizing such a separator achieved an impressive cycling life of 500 h at a high current density/capacity of 10 mA cm −2 /4 mAh cm −2 , nearly nine times longer than the battery using the unmodified GF separator (<55 h). The superior electrochemical performance was verified in both Zn//AC and Zn//LiMn 2 O 4 full battery evaluations. This work presents a novel synergistic modification strategy for developing advanced separators for aqueous ZIBs.
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PubMed
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Ni Chujun,Chen Di,Wen Xin,Jin Binjie,He Yi,Xie Tao,Zhao Qian
Stimuli-responsive shape-changing hydrogels are attractive candidates for use as underwater soft robots. The bottleneck lies in the low actuation speed inherently limited by the water diffusion between hydrogels and their surrounding environment. In addition, accessing complex motions is restricted by the material fabrication methods. Here we report a hitherto unknown mechanism to achieve high-speed and programmable actuations for a disulfide crosslinked thermally responsive hydrogel. The dynamic photo-activated disulfide bond exchange allows photo-mechanical programming to introduce spatio-selective network anisotropy. This gives rise to an actuation behavior dominated by thermally driven conformation change of the locally oriented polymer chains instead of the common mass-diffusion-based mechanism. With the incorporation of photothermal fillers, light-powered oscillation at frequencies as high as 1.7 Hz is realized. This, coupled with the versatility of the programming, allows access to robots with diverse high-speed motions including continuous swimming, step-wise walking, and rotating.
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Biomass Conversion and Biorefinery
·
2023
·
IF 4
Gao Xin,Xu Tingting,Shi Yunlin,Bai Zhongzhong,Zhou Jun,Wu Hongli,Cao Fei,Wei Ping
Roots and stems comprise a large proportion of traditional Chinese medicines and often serve as the energy storage units of plants. However, their decoction residues still contain a significant amount of starch, and direct landfilling, incineration, or carbon disposal results in a wastage of resources. In this study, five types of starch-rich traditional Chinese medicine decoction residues (TCMDRs)c, namely, Radix Isatidis Rhizoma Dioscoreae , Rhizoma Corydalis and Fritillaria Thunbergii . Radix Paeoniae Alba were screened and hydrolyzed using amylase-glucoamylase to produce fermentable sugar. The resulting glucose yields were 87.54%, 84.51%, 85.14%, 82.55%, and 87.75%, respectively. The enzymatic hydrolysate, after flocculation-decolorization treatment, was used to produce D-lactic acid and ethanol, resulting in a concentration and yield of 121.11 g/L (0.97 g/g) and 54.17 g/L (0.49 g/g), respectively. When single or mixed starch-rich TCMDRs were directly used as feedstocks for ethanol production via simultaneous saccharification and fermentation (SSF), they exhibited similar ethanol fermentability, with yields ranging from 0.33 to 0.43 g/g. The SSF residues were thermochemically transformed into biochar with a specific surface area of 89–459 m 2 /g to reduce secondary waste generation. The utilization value of starch-rich TCMDRs was significantly improved through the implementation of enzymatic hydrolysis to produce fermentable sugars, anaerobic fermentation to produce D-lactic acid and ethanol, and the utilization of fermentation residues for biochar production. Graphical abstract
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DYES AND PIGMENTS
·
2023
·
IF 4.5
Shuai Li,Yuanshu Xiao,Guohua Shan,Pengchao Li,Lixia Jia
Liquid photonic crystals (LPCs) with structural colors have become the most promising materials for preparing structural color fabrics, which have received extensive attention in textile printing and dyeing. However, the tedious and uncontrollable preparation process for LPCs and its expensive equipment for structural color fabrics with asymmetric wettability limit the practical application of structural color materials. Herein, inspired by the Janus wettability of the unidirectional moisture transport fabric, a simple and efficient approach is reported to fabricate single-sided structural color fabrics (SSCFs) with asymmetric wettability and angle dependence. To obtain asymmetrically wetted substrate fabrics, a low-cost, high-temperature assisted spraying strategy is used to build a hydrophobic layer on one side of the fabric. The ready-to-use LPCs with target mass fraction are accurately prepared by re-dispersing the dry poly(styrene-methyl methacrylate-acrylic acid) (P(St-MMA-AA)) microsphere powder and are uniformly scraped onto the hydrophilic side of the fabric to prepare SSCFs. The as-prepared samples show a brilliant and iridescent structural color, and their color is adjusted by varying the size of the P(St-MMA-AA) microspheres. The water contact angle of the front side (with structural colors) of SSCFs treated by sintering and water bath is 37°, which facilitates further encapsulation to improve the color fastness of SSCFs. Meanwhile, the photonic crystals on the fabric remain ordered. This work provides an alternative, low-cost and practical preparation scheme for the structural coloring of textiles based on LPCs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhongtai Lin,Ling Li,Changhong Xi,Xue Li,Shixuan Feng,Chuanjin Wang,Haowen Wang,Tingxi Li,Yong Ma
Layered double hydroxides (LDHs) with unique layered structure have excellent theoretical capacitance. Nevertheless, the constrained availability of electrically active sites and cationic species curtails their feasibility for practical implementation within supercapacitors. Most of the reported materials are bimetallic hydroxides, and fewer studies are on trimetallic hydroxides. In here, the hollow dodecahedron NiCoZn-LDH is synthesized using CoZn metal–organic frameworks (CoZn-MOFs) as template. Its morphology and composition are studied in detail. Concurrently, the effect of the amount of third component on the resulting structure of NiCoZn-LDH is also researched. Benefiting from its favorable structural and compositional attributes to efficient transfer of ions and electrons, NiCoZn-LDH-200 demonstrates outstanding specific capacitance of 1003.3F g −1 at 0.5 A/g. Furthermore, flexible asymmetric supercapacitor utilizing NiCoZn-LDH-200 as the positive electrode and activated carbon (AC) as the negative electrode reveals favorable electrochemical performances, including a notable specific capacitance of 184.7F g −1 at 0.5 A/g, a power density of 368.21 W kg −1 at a high energy density of 65.66 Wh kg −1 , an energy density of 31.78 Wh kg −1 at a high power density of 3985.97 W kg −1 , a capacitance retention of 92 % after 8000 cycles at 5 A/g, and a good capacitance retention of 90 % after 500 cycles of bending. The template method presented herein can effectively solve the problem of easy accumulation and improve the electrochemical properties of the materials, which exhibits a broad research prospect.
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高影响因子
Small
·
2023
·
IF 13.3
Sijia Zheng,Haiyan Xue,Ying Liu,Xing Yu,Zhihai Cao
Thermal interface materials (TIMs) are in desperate desire with the development of the modern electronic industry. An excellent TIM needs desired comprehensive properties including but not limited to high thermal conductivity, low Yong's modulus, lightweight, as well as low price. However, as is typically the case, those properties are naturally contradictory. To tackle such dilemmas, a strategy of construction high-performance TIM inspired by alveoli is proposed. The material design includes the self-alignment of graphite into 3D interconnected thermally conductive networks by polydimethylsiloxane beads (PBs) -the alveoli; and a small amount of liquid metal (LM) – capillary networks bridging the PBs and graphite network. Through the delicate structural regulation and the synergistic effect of the LM and solid graphite filler, superb thermal conductivity (9.98 ± 0.34 W m −1 K −1 ) can be achieved. The light emitting diode (LED) application and their performance in the central processing unit (CPU) heat dispersion manifest the TIM developed in the work has stable thermal conductivity for long-term applications. The thermally conductive, soft, and lightweight composites are believed to be high-performance silicone bases TIMs for advanced electronics.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Qianglong Chen,Ruibin Guo,Yangyang Jiang,Li Li,Wenjing Qin,Yanchun Tan,Nijuan Liu,Zunli Mo
CoMoO 4 /NiCo 2 O 4 electrodes with a three-dimensional nano-sphere structure have been successfully prepared by a combination of hydrothermal and calcination methods. The electrode material exhibits a high specific capacitance of 1175 F g −1 at 1 A/g, excellent multiplicative performance (74.2 % capacity at 15 A/g) and good cycling stability (85.9 % specific capacitance retention after 10,000 cycles). The asymmetric supercapacitor was constructed using activated carbon (AC) as the negative electrode, showing excellent energy density (27.7 wh kg −1 ) and power density (806 W kg −1 ). It also has an extremely long operating life, maintaining a specific capacitance of 78.3 % after 5000 cycles at current densities up to 6 A/g. The results indicate that the synthesized mixed transition metal oxides CoMoO 4 /NiCo 2 O 4 are promising as composite electrode materials for high-performance asymmetric supercapacitors.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·
IF 3.6
Kai Wang,Hengtai Zhang,Jinrong Liang,Zhigang Xu,Shangyu Huang,Jian Peng,Chao Yang,Wenjun Li,Qiang Shen,Chuanbin Wang
Al content is of great importance for the evolution of the microstructure and compressive performance of the high-Mn and high-Al porous steels. Herein, Fe–Mn–Al porous steels with different Al contents are prepared via powder sintering at different temperatures. The results show that the main phases of the sintered samples at 640 °C are α-Fe, α-Mn, and Al, while a small amount of Fe 2 Al 5 and Al 8 Mn 5 exists in the samples with 15 and 20 wt% Al. At 1200 °C, the sintered sample with 5 wt% Al is composed of γ-Fe, while those with 15 and 20 wt% Al are mainly α-Fe. The length of Mn depletion region and porosity of the samples increase with the increase of Al content. The largest total and open porosity are observed in the 1200 °C-sintered sample with 20 wt% Al, which are 63.1 and 60.7 vol%, respectively. The compressive strength decreases sharply from 770 MPa for the sample with 5 wt% Al to 7.5 MPa with 15 wt% Al, after sintering at 1200 °C. Ductile fracture occurs in the sample with 5 wt% Al, while brittle fracture is the main fracture mode in those with 15 and 20 wt% Al.
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Energy Technology
·
2023
·Vol. 12
·期 1
·2300623
·
IF 3.8
Hui Yun,Haiyan Wang,Jing Bai,Xuesong Wang,Xiaomin Dai,Xiaojiang Hou,Yunhua Xu
MgH 2 -based composites are prepared by high-energy ball milling surface catalysis with carbon isomeric catalysts to explore isothermal and nonisothermal H 2 storage behavior. The reduction particle size and catalysts are conducive to absorption/desorption. The release peak temperatures of MgH 2 catalyzed by activated carbon ( AC), carbon nanotubes ( CNTs), reduced graphene oxide ( rGO), and expanded graphite (EG) are 445, 424, 458, and 446 °C, lower than that of MgH 2 (≈463 °C). The hydrogenation capacities for the 3rd cycle of MgH 2 , MgH 2 –AC, MgH 2 –CNTs, and MgH 2 –EG are 3.35, 6.52, 6.66, and 6.92 wt%, corresponding to 47%, 90%, 92%, and 96% conversion rates. The dehydrogenation capacities increase to 5.86, 4.94, 3.18, and 5.74 wt% of MgH 2 –AC, MgH 2 –CNTs, MgH 2 –rGO, and MgH 2 –EG within 0.5 h, higher than MgH 2 (2.29 wt%). The final dehydrogenation capacities of MgH 2 , MgH 2 –AC, MgH 2 –CNTs, MgH 2 –rGO, and MgH 2 –EG are 2.84, 6.69, 5.14, 3.65, and 6.61 wt%. The absorption capacities of MgH 2 , MgH 2 –AC, MgH 2 –CNTs, MgH 2 –rGO, and MgH 2 –EG within 0.5 h are 2.42, 6.47, 6.21, 3.03, and 4.20 wt%, and the final hydrogenation capacities reach 2.58, 6.65, 6.33, 3.10, and 4.34 wt%. The initial kinetics and the final degrees of absorption/desorption of MgH 2 are elevated by carbon isomeric catalysts.
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高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 3.9
Yuying Hu,Xiaofan Wang,Shihao Zhang,Zimu Liu,Tengfang Hu,Xin Wang,Xiaoming Peng,Hongling Dai,Jing Wu,Fengping Hu
Iron-carbon micro-electrolysis (ICME) materials are widely used as composite conductive materials for wastewater treatment to promote the degradation of volatile solids (VS), but there is virtually no research on their effect on high-solid anaerobic digestion (HSAD). This study aimed to investigate the effect of 10–50 g/L ICME dosages on HSAD and to reveal the microbial enhancement mechanism. The batch experiments (working volume of 400 mL) were conducted in a constant temperature water bath shaker. The results showed that the ICME materials promoted methane production by HSAD. The highest methane production rate was 297.79 mL/ g VS at a dosage of 50 g/L, which was 28% higher than that of the control. Scanning electron microscopy results showed that the ICME materials increased the attachment area of microorganisms. Further analyses of microbial community indicated that ICME materials facilitate symbiotic metabolism of syntrophic acetate-oxidizing bacteria ( Synergistaceae ) and hydrogenotrophic methanogens ( Methanospirillum ). This potentially promotes the conversion of the acetoacetic methanogenesis pathway to the syntrophic acetate oxidation and hydrogenotrophic methanogenesis pathways. This study revealed ICME material enhancement in HSAD as well as new insights into the microbial mechanisms.
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危险品化学品经营许可证（带存储）