Aggregate
·
2023
·
IF 18.8
Xiao Chen,Lei Wang,Yan Gao,Yang Li,Xiaowei Zhang,Yu Jiang,Ge Wang
The photothermal conversion capacity of pristine organic phase change materials (PCMs) is inherently insufficient in solar energy utilization. To upgrade their photothermal conversion capacity, we developed bimetallic zeolitic imidazolate framework (ZIF) derived Co/N co-doped flower-like carbon (Co/N-FLC)-based composite PCMs toward solar energy harvesting. 3D interconnected carbon framework with low interfacial thermal resistance, abundant carbon defects and high content of nitrogen doping, excellent localized surface plasmon resonance (LSPR) effect of Co nanoparticles, and light absorber Co 3 ZnC in Co/N-FLC synergistically upgrade the photothermal capacity of (polyethylene glycol) PEG@Co/N-FLC composite PCMs with an ultrahigh photothermal conversion efficiency of 94.8% under 0.16 W/cm 2 . Uniformly anchored Co and Co 3 ZnC nanoparticles in carbon framework guarantee excellent photon capture ability. Bridging carbon nanotubes (CNTs) in 2D carbon nanosheets further accelerate the rapid transport of phonons by constructing cross-connected heat transfer paths. Additionally, PEG@Co/N-FLC exhibits a thermal energy storage density of 100.69 J/g and excellent thermal stability and durable reliability. Therefore, PEG@Co/N-FLC composite PCMs are promising candidates to accelerate the efficient utilization of solar energy.
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JOURNAL OF CHEMICAL SCIENCES
·
2022
·Vol. 134
·期 2
·1-11
·
IF 2.15
Yu Miao,Ji Shuai,Li Zhifang,Song Kun,Li Yueyu,Yang Jian,Yang Changlong
A simple ion-exchange method is used to prepare Mn and Co-supported TNU-9 denitration catalyst for NH 3 -SCR. The denitration activity and H 2 O/SO 2 resistance performance of the catalyst are systematically studied. The denitration activity test exhibits that the NO x removal rate of Mn-Co/TNU-9 is higher than that of Mn/TNU-9 and Co/TNU-9, the NO x removal rate is greater than 90% and the N 2 selectivity is greater than 99% in the range of 150 ~ 450 °C. It is because the redox cycle of Mn 4+ + Co 2+ ↔ Mn 3+ + Co 3+ improves the redox performance of the catalyst, which is conducive to the conduction of electrons, and then accelerates the oxidation of NO to NO 2 to produce a "fast SCR" reaction, and finally optimizes the overall SCR performance. Furthermore, the change is not significant for the catalytic activity over Mn-Co/TNU-9 in the presence of water. However, the sulfur resistance is poor at low temperatures due to the presence of ammonium bisulfate. It also has excellent catalytic stability. Therefore, supported TNU-9 catalysts will have a good development prospect in denitrification. Graphical abstract Mn-Co co-doped TNU-9 catalyst was successfully synthesized by simple ion exchange method and applied in the NH 3 -SCR. The results show that Mn-Co/TNU-9 catalyst has an excellent wide activity window in a wide temperature range of 150-450°C (NO x conversion over 90%), which is because Mn+Co 2+ ↔Mn+Co improves the redox performance and facilitates the electron transfer, which further accelerates the oxidation of NO into NO 2 that could result in the “Fast SCR” reaction. The synergistic effect between Mn and Co bimetallic can also improve activity. Moreover, Mn-Co/TNU-9 has very good catalytic stability.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xinle Wang,Jin Chen,Yuzhao Ma,Jianye Shi,Yueying Wang,Xiaofeng Yang,Meidan Que,Yuxi Zhou,Yanjun Li
Two-dimensional (2D) transition metal carbide MXene (Ti 3 C 2 T x ) exhibits great potential in electromagnetic wave (EMW) absorbing materials due to its abundant surface functional groups and defects, tunable conductivity and high specific surface area. The Co@NC/TiO 2 /C composites were successfully synthesized through a solvothermal method and carbonization process using Ti 3 C 2 T x /Co-BTC as precursor. The incorporation of magnetic metal Co nanoparticles and Rutile-TiO 2 effectively addresses the issue of single loss mechanism in Ti 3 C 2 T x . The results show that CTC-100 exhibits excellent EMW absorption performance with a minimum reflection loss (RL) value of −51.3 dB at a thickness of only 1.48 mm, and the corresponding effective absorption bandwidth is (EAB, RL < −10 dB) 4.3 GHz. Simultaneously, by adjusting the matching thickness of the material from 1.29 mm to 5.0 mm, the EAB can achieve 15.42 GHz (from 2.85 GHz to 18 GHz). The excellent EMW absorption performance of CTC-100 composite is primarily attributed to the synergistic effect of magnetic loss and dielectric loss. This study provided an effective strategy for the design of Ti 3 C 2 T x -based EMW absorbing materials with high absorption intensity, reduced thickness, and broad effective absorption bandwidth (EAB).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Hao Gu,Qin Zhong,Yiqing Zeng,Shule Zhang,Yunfei Bu
The supercapacitive performance of high-rate capacity and long-term cycling stability is still a big challenge for electroactive materials. Herein, Ni and Zn co-substituted Co carbonate hydroxide (NiZn-CoCH) flowers array is self-assembled on nickel foams (NFs) using l -ascorbic acid as a nanostructure inducer. The NiZn-CoCH flowers, consisting of silk-like nanosheets, are deservedly large electrode-electrolyte contact area and suitable ion-diffusion channel. The nanostructure and Ni and Zn co-substitution significantly improve energy storage performance. This electrode exhibits a high specific capacitance of 2020.8 F g −1 at 1 A g −1 with high-rate capacity (remain 80.2% at 10 A g −1 ) and 5000-cycle stability (almost unchanged after 1500 cycles at 10 A g −1 ). Additionally, an assembled asymmetric supercapacitor (ASC) device of NiZn-CoCH//activated carbon (AC) achieves a high energy density of 29.6 Wh kg −1 at a power density of 375 W kg −1 and only a 0.5% decrease of the capacitance after 2500 cycles. This facile and novel preparation method, using l -ascorbic acid, may be promising for industrial production of electroactive materials for the high-performance energy storage and conversion devices.
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高影响因子
Molecular Catalysis
·
2017
·
IF 0
Fang Dong,Yinshuang Zhao,Weiliang Han,Haijun Zhao,Gongxuan Lu,Zhicheng Tang
Despite tremendous efforts, developing a series of heterogeneous catalysts for CO oxidation elimination with high activity at low cost remains a great challenge. Here, we report a bifunctional Co-based nanocrystals anchoring in the graphene oxide layer as a high-performance catalyst for CO oxidation. Although a single cobalt or graphene oxide catalysts alone have the lower catalytic activity, their combination exhibits an unexpected, surprisingly high CO activity that is further enhanced by a series of oxygen-containing functional groups on the surface of graphene oxide sheets. The Co/graphene oxide calcined at 300 °C (Co/GO–300 °C) exhibits the outstanding catalytic activity with T 100 = 51 °C but superior stability, producing a high-performance non-precious metal-based catalyst for CO oxidation elimination. Under a series of critical characterizations, the unusual catalytic activity of Co/GO–300 °C sample is attributed to the synergistic effect between the oxygen-containing functional groups of graphene oxide sheets and Co species. Especially, the existence of Co 3+ species could promote the adsorption and activation of CO molecules.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Meijing Cao,Jing Tian,Yang Zhou,WenLong Liu,Jin Dang,Weibing Li,Jiarun Li,Lei Wang
The low electrical conductivity and catalytic activity of transition metal sulfides have been identified as the primary factors limiting their application in the field of electrocatalytic water splitting. In this study, FeS 2 and Co-FeS x were initially synthesized through a hydrothermal method, followed by further annealing in an NH 3 atmosphere to obtain Co,N-FeS x . The introduction of Co led to adjustments in the electronic structure, resulting in the formation of FeS 2 /FeS (FeS x ) heterojunctions that facilitated accelerated charge transfer. Simultaneously, Co element doping increased the electrochemical active surface area, providing more active sites for the reactions. N element doping, on the other hand, introduced sulfur vacancies, thereby enhancing electrical conductivity and improving charge transfer efficiency. As a result, Co,N-FeS x exhibited significantly higher activities for the oxygen evolution reaction (OER) and overall water splitting compared to FeS 2 , with overpotentials of 290 mV and 330 mV, respectively, at a current density of 10 mA cm −2 . Furthermore, the catalyst demonstrated excellent stability. The designed structure of the catalyst provides theoretical support for the study of Fe-based catalysts in OER and overall water splitting.
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Small
·
2024
·
IF 13
Diancheng Duan,Junlang Huo,Jiaxiang Chen,Bin Chi,Zhangsen Chen,Shuhui Sun,Yang Zhao,He Zhao,Zhiming Cui,Shijun Liao
Single-atom metal-doped M–N–C (M═Fe, Co, Mn, or Ni) catalysts exhibit excellent catalytic activity toward oxygen reduction reactions (ORR). However, their performance still has a large gap considering the demand for their practical applications. This study reports a high-performance dual single-atom doped carbon catalyst (HfCo–N–C), which is prepared by pyrolyzing Co and Hf co-doped ZIF-8 . Co and Hf are atomically dispersed in the carbon framework and coordinated with N to form Co–N 4 and Hf–N 4 active moieties. The synergetic effect between Co–N 4 and Hf–N 4 significantly enhance the catalytic activity and durability of the catalyst. In an acidic medium, the ORR half-wave potential ( E 1/2 ) of the catalyst is up to 0.82 V , which is much higher than that of the Co–N–C catalyst without Hf co-doping (0.80 V). The kinetic current density of the catalyst is up to 2.49 A cm −2 at 0.85 V , which is 1.74 times that of the Co–N–C catalyst without Hf co-doping. Moreover, the catalyst exhibits excellent cathodic performance in single proton exchange membrane fuel cells and Zn–air batteries. Furthermore, Hf co-doping can effectively suppress the formation of H 2 O 2 , resulting in significantly improved stability and durability.
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PubMed
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FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Xin Guan,Zhuocheng Fei,Luyi Wang,Guohui Ji,Guocheng Du,Zhenwu Ma,Jingwen Zhou
Cultured meat has attracted widespread interest and research due to its sustainable meat production through innovative technologies. Recently, studies have been carried out on manufacturing muscle or fat tissue for application in cultured meat, but it remains a challenge to engineer and produce cultured meat integrating both muscle and fat tissues. Herein, it is aimed to simultaneously assemble porcine muscle stem cells (pMuSCs) and adipose-derived mesenchymal stem cells (pAMSCs) by 3D bioprinting and to develop a co-differentiation approach to manufacture cultured streaky pork (CSP) with well-defined muscle and fat compositions. Previously, we have fabricated a collagen-chitosan composite hydrogel that efficiently supported the 3D proliferation and differentiation of pMuSCs. In this work, we first determined a composite hydrogel consisting of fibrinogen and sodium alginate for the 3D culture of pAMSCs. Next, for the two bioinks encapsulating pMuSCs and pAMSCs, respectively, we obtained the optimal cell loading number and printing parameters (pressure and speed) of an extrusion bioprinter and developed a co-differentiation approach that induced both myogenic differentiation of pMuSCs and adipogenic differentiation of pAMSCs. Furthermore, we fabricated meat-like 3D constructs by co-printing two bioinks and then induced both myogenesis and adipogenesis with the co-differentiation approach, thereby producing CSP containing both muscle and fat tissues. The textural and nutritional assessment demonstrated that the CSP possessed the cooking properties and eating qualities of meat products. This work provides innovative strategies and technical references for the production of cultured meat with tissue composition and spatial structure closer to real meat.
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POLYMER BULLETIN
·
2012
·Vol. 70
·期 2
·467-478
·
IF 1.532
Yan Manqing,Yang Hongjun,Xing Xinming
Poly(ε-caprolactone- co -ethylene carbonate- co -ethylene oxide) (CL- co -EC- co -EO) copolymer was synthesized via ring-opening copolymerization of ε-caprolactone (CL) and 1,3-dioxolan-2-one with a metal-free phosphazene catalyst ( t -BuP 4 ). The monomer conversion and molecular weight in CL- co -EC- co -EO copolymer were characterized by nuclear magnetic resonance and gel permeation chromatography, respectively. Moreover crystallization behavior of CL- co -EC- co -EO copolymer was investigated by differential scanning calorimeter and wide-angle X-ray diffraction. The enzymatic degradation of the copolymer has been investigated by quartz crystal microbalance with dissipation. Our studies demonstrate that as PCL content in the copolymer decreases, the degree of crystallinity and crystal size decrease, while the enzymatic degradation rate increases. The copolymer exhibits layer-by-layer degradation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jun Lu,Mingyue Xia,Jing Liang,Lie Zou,Xiaolong Liang,Yan Gao,Fei Li,Junfeng Gao,Jinxuan Liu
Cu 2 Y 2 O 5 with asymmetric atomic distance distribution was investigated for the first time in CO 2 electroreduction reaction (CO 2 RR). The high electrophilicity of Y not only regulates the electronic structure of Cu, but also acts as an electron dock to attract CO*, promoting its toward Y and effectively protecting the stability of Cu 2+ during the reduction process. In a Flow cell, CYO-850 achieves an exceptionally high selectivity of 70 % for ethylene, accompanied by a high partial current density of 200 mA cm −2 . In-situ infrared spectroscopy and density functional theory results indicate that interaction between Cu and Y promotes the dimerization of *OCCO intermediates and directs the CO 2 reduction pathway towards ethylene. This is the first report on the use of Y element in the field of CO 2 reduction.
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Materials Today Chemistry
·
2025
·
IF 6.7
Xiaotong Song,Junyuan Zhang,Weiqi Li,Huanying Li,Zhiguo Li,Xiaolong Xu,Changyu Liu,Jianbo Jia
Metal-organic framework (MOF)-derived carbon nanocomposites have been widely applied in electrocatalytic fields due to their simple synthesis, excellent conductivity, and high catalytic activity. In this study, ZIF-67 and MIL-101(Fe) were synthesized via liquid-phase precipitation and solvent thermal methods, respectively. Then, the two kinds of MOFs were ground and calcined with melamine to prepare flower-like carbon nanocomposites. Under the optimal conditions, the oxygen reduction reaction (ORR) onset potential (E onset = 1.019 V vs. reversible hydrogen electrode, RHE) and half-wave potential (E 1/2 = 0.866 V) of this prepared composite are both higher than those of commercial Pt/C catalyst (E onset = 0.971 V, E 1/2 = 0.838 V). The prepared nanocomposite exhibits a lower oxygen evolution reaction (OER) overpotential (η = 338 mV at 10 mA cm −2 ) than RuO 2 (η = 372 mV), demonstrating superior catalytic performance. The prepared nanocomposite achieves simultaneous enhancement in both ORR and OER bifunctional catalytic performances. The power density of a zinc-air battery (ZAB) assembled with the optimal nanocomposite was 2.65 times higher than that of the Pt/C + RuO 2 system. This study establishes a fundamental framework for the rational design of high-performance ORR/OER bifunctional catalysts, while pioneering new avenues for ZAB technology commercialization.
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ChemPlusChem
·
2025
·
IF 2.8
Wen Feng,Congyue Sun,Xiaojin Li,Xiliang Luo,Liu Wenqi
The exploitation of an efficient and stable oxygen reduction reaction (ORR) catalyst plays a crucial role in the slow kinetics of the cathode in proton exchange membrane fuel cells (PEMFC). In this study, a catalyst loaded with PtCo alloys on Co and N co-doped carbon nanotubes (PtCoNC) was synthesized for oxygen reduction reaction, which has high activity and stability. The carbon nanotube structure provides efficient transport channels for reactant exchange and product transport, as well as provides a wealth of triple-phase sites, that improves the utilization of Pt. Further, the PtCoNC catalyst exhibits robust metal-support interactions, which can be attributed to the anchoring of the Co-Nx sites to Pt. Theoretical calculations indicating an increase in binding energy and a reduction in layer spacing provide conclusive verification of the presence of augmented interactions between PtCo nanoparticles and the support. As a result, the low Pt-loaded (0.025 mg cm-2) PtCoNC catalyst demonstrates superior ORR activity to that of commercial Pt/C with an impressive half-wave potential of 0.893 V in 0.1 M HClO4 solution. At 0.9 V, its mass activity and specific activity are 3 and 2.6 times that of commercial Pt/C, respectively. It also shows better stability in acidic environment.
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