Nanoscale
·
2021
·Vol. 13
·期 30
·13065-13071
·
IF 7.79
Kun Wang,Yongyuan Hu,Jian Pei,Fengyang Jing,Zhongzheng Qin,Huabin Kong,Jinli Wang,Yumin Zhou,Gang Chen
High-capacity Co2VO4 has become a potential anode material for lithium-ion batteries (LIBs), benefiting from its lower output voltage during cycling than other cobalt vanadates. However, the application of this new conversion-type electrode is still hampered by its inherent large volume variation and poor kinetics. Here, a 2D–2D heterostructure building strategy has been developed to enhance the electrode performance of Co2VO4 through construction of Co/Co2VO4 nanocomposites converted from the in situ phase separation of Co2V2O7·3.3H2O nanosheets. Co/Co2VO4 based on face-to-face contact exhibits the optimized stacking configuration, where Co nanocrystals give gaps of several nanometers between stacked Co2VO4 nanosheets, enabling full contact with the electrolyte, a shorter transport path of lithium ions and more reactive sites. With this design, Co/Co2VO4 anodes deliver outstanding reversible capacity (750 mA h g−1 at 1 A g−1) with ultrahigh capacity retention rate, and excellent cycle stability at high rate (520 mA h g−1 at 5 A g−1 retained after 400 cycles). An “active center's charge transfer—capacity compensation” model was proposed based on capacity analysis, XPS depth analysis and HRTEM observation to uncover the fundamental reason of the excellent cycle performance. This in situ 2D–2D heterostructure constructing strategy may open up the possibility for designing high-performance LIBs.
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale Advances
·
2020
·Vol. 2
·期 3
·1084-1089
·
IF 0
Shuli Yin,Ziqiang Wang,Chunjie Li,Hongjie Yu,Kai Deng,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Rational design of Pt-based nanostructures with a controllable morphology and composition is vital for electrocatalysis. Herein, we demonstrate a dual-template strategy to fabricate well-defined cage-bell nanostructures including a Pt core and a mesoporous PtM (M = Co, Ni) bimetallic shell (Pt@mPtM (M = Co, Ni) CBs). Owing to their unique nanostructure and bimetallic properties, Pt@mPtM (M = Co, Ni) CBs show higher catalytic activity, better durability and stronger CO tolerance for the methanol oxidation reaction than commercial Pt/C. This work provides a general method for convenient preparation of cage-bell nanostructures with a mesoporous bimetallic shell, which have high promising potential for application in electrocatalytic fields.
✓ 已验证
DOI
PubMed
Journal of Materials Chemistry B
·
2014
·Vol. 2
·期 38
·6560-6570
·
IF 0
Haiqin Song,Haihua Xiao,Minhua Zheng,Ruogu Qi,Lesan Yan,Xiabin Jing
Anticancer drugs of gemcitabine and oxaliplatin combined in a clinic regimen (GEMOX regimen) were co-loaded to a biodegradable polymer platform for drug delivery.
✓ 已验证
DOI
PubMed
SURFACE ENGINEERING
·
2020
·
IF 2.433
Zhen He,Di Cao,Fangcheng Cao,Shengping Zhang,Yuxin Wang
The effects of heat treatment on the properties of electrodeposited Co–P–TiO2 nanocomposite coatings were systematically investigated. The TiO2 nanoparticles-reinforced Co–P–TiO2 nanocomposites were heat-treated at different temperatures. Thermal analysis was conducted to characterize the structural transitions. The phase constituents and surface morphology of nanocomposites were identified. The mechanical properties including microhardness and wear tests were examined, and the electrochemical behaviour of Co–P–TiO2 was determined. At the increasing heating temperature, the structure of Co–P–TiO2 was gradually changed from amorphous into crystalline, with its surface morphology being smoother. Proper heat treatment can significantly improve the mechanical properties and corrosion resistance of coatings. When Co–P–TiO2 coating was heat-treated at 350°C, a smooth and flat surface morphology was obtained and optimal physicochemical performance among the examined coatings was achieved.
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 11
·1-11
·
IF 2.7
Lingling Yang,Yanjie Zhu,Haokai Liu,Tao Guo,Hui Tang,Shuangdong Ya,Yu Li,Hongguang Wang,Yanli Luo,Jiuming Ma,Dong Wan
Galvanostatic electrochemical co-deposition was used to fabricate nickel-based reduced graphene oxide (Ni–rGO) nanocomposite by varying the current density in the range of 3–6 Adm −2 and at rGO loading of 1 g L −1 . The process relies on the reduction of oxygenated functional groups of GO. By excessive incorporation and simultaneous reduction of GO in the structure of Ni–rGO composite coatings, the morphology transforms into structure with rough and three-dimensional (3D) features. The formation of Ni–rGO composite coatings was confirmed by investigating 3D morphology by SEM and XRD studies. Furthermore, comprehensive investigation of the thermal diffusivity, density, specific heat capacity, and thermal conductivity of Ni–rGO composite was conducted. Moreover, the relationship between current density and thermal conductivity was also evaluated. The test results indicate that the prepared Ni–rGO composite exhibits excellent thermal conductivity when the current density is 5 A dm −2 . Combined with the outstanding performance of corrosion resistance in the early stages, the as-prepared Ni–rGO composite coatings are highly promising for cooling systems in ship and heat dissipation system in ocean electronic equipment.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Bo He,Siyuan Jiang,Ce Wang,Zhihao Man,Yilong Hou,Jiangwei Shang,Xiuwen Cheng
Activation of peroxymonosulfate (PMS) to degrade refractory antibiotics is an essential branch of advanced oxidation processes (AOPs). We reported in this study that the (1 1 1) and (0 0 2) crystal planes of CuO with the (3 1 1) crystal plane of Cu 0.72 Co 2.28 O 4 formed surface heterojunctions, which are used as interfaces for PMS adsorption to explore the performance of different heterojunctions. The formation of Cu 0.72 Co 2.28 O 4 /CuO heterojunction makes up for the CuO (0 0 2) surface’s shortcomings and improves the adsorption and activation of PMS by the CuO (0 0 2) surface. The heterojunction significantly grows the length of the PMS’ O-O bond compared to the single-crystal surface, which leads to lower energy required for PMS’ O-O bond breaking and further verified the increased covalent character. Based on the quality influencing factors values, the influence of four factors on sulfamethoxazole (SMX) deterioration fits as follows: HCO 3 – has the largest relative relevance among the factors, followed by H 2 PO 4 - , NO 3 – , and Cl - . The Box-Behnken methodology fitted the optimum efficiency with the initial concentration of Cl - , NO 3 – , H 2 PO 4 - , and HCO 3 – were 8.0, 10.0, 12.5, and 7.5 mM, respectively. The SMX’s atoms (N, and O) have higher electrophilic attack sites, indicating these atoms are electrophilic attack sites.
✓ 已验证
DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Gong Shanhe,Xia Qing,Zhai Yanjie,Li Weisong,Wu Jie,Zhou Yingying,Liao Yucong,Zhu Kuang,Yang Yuchen,Yang Yile,She Xiaojie,Wang Zhaolong,Xu Hui,Zhang Xiao,Lau Shu Ping
Direct electrochemical conversion of captured carbon species offers a route to avoid the energy-intensive steps of thermal CO 2 release, compression and transport in conventional carbon capture and utilization. In proton exchange membrane (PEM) reactors, however, the acidic cathode environment promotes hydrogen evolution and limits CO 2 regeneration from (bi)carbonate capture media, resulting in low carbon utilization and high energy demand. Here we show a modular PEM–porous solid electrolyte (PSE) reactor for direct conversion of (bi)carbonate to CO. Using a transparent cell with in situ visualization, we reveal that the PSE regulates proton transport, reduces local proton reduction, limits bubble accumulation and facilitates CO 2 transport to the cathode. The PEM–PSE reactor achieves a CO Faradaic efficiency of 90% at 200 mA cm −2 , a carbon efficiency of 84%, and an energy consumption of ~26.0 GJ t −1 CO. It operates at current densities up to 800 mA cm −2 , reaching a CO rate of ~8.0 mmol h −1 cm −2 . These results highlight the regulation of proton and gas transport in the electrochemical conversion of captured carbon.
✓ 已验证
DOI
高影响因子
Engineering
·
2021
·
IF 7.553
Xinyu Cao,Tiancheng Pu,Bar Mosevitzky Lis,Israel E. Wachs,Chong Peng,Minghui Zhu,Yongkang Hu
Reductive pretreatment is an important step for activating supported metal catalysts but has received little attention. In this study, reconstruction of the supported nickel catalyst was found to be sensitive to pretreatment conditions. In contrast to the traditional activation procedure in hydrogen, activating the catalyst in syngas created supported Ni nanoparticles with a polycrystalline structure containing an abundance of grain boundaries. The unique post-activation catalyst structure offered enhanced CO adsorption and an improved CO methanation rate. The current strategy to tune the catalyst structure via manipulating the activation conditions can potentially guide the rational design of other supported metal catalysts.
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 7
·2045-2055
·
IF 2.482
Li Chaoqun,Yang Yang,Ren Wei,Wang Jian,Zhu Tingyu,Xu Wenqing
Abstract CO is toxic and detrimental to human beings and the atmosphere. The presence of CO has become one of the important indicators for evaluating ambient air quality. Iron and steel sintering generate large amounts of flue gas emissions containing approximately 1% CO, which has become an important factor restricting the improvement of air quality in steel cities. The catalytic oxidation method is the simplest and most effective method for CO emission control. In this work, a series of Cu x Ce y /TiO 2 catalysts with different Ce doping levels were prepared by a one-step impregnation method and subsequently tested for catalytic CO oxidation. The Cu 0.5 Ce 0.5 /TiO 2 sample has the best catalytic activity under the conditions of 1% CO and 10% H 2 O. The catalysts were next characterized by XRD, BET, TEM, H 2 -TPR, XPS and in-situ DRIFTS methods. The characterization results show that Ce doping promotes the dispersion of copper species on the catalyst surface and improve the redox performance of the catalyst. The results of in-situ experiments showed that both Cu/TiO 2 and Cu 0.5 Ce 0.5 /TiO 2 catalysts followed Mars and van Krevelen mechanism, and Ce doping enhanced the adsorption and activation of oxygen, thus improving the low-temperature reaction activity of the catalysts. Graphic Abstract
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Yanwei Cao,Yao Peng,Danyang Cheng,Lin Chen,Maolin Wang,Cheng Shang,Lirong Zheng,Ding Ma,Zhi-Pan Liu,Lin He
The conversion of carbon monoxide (CO) into high-value organic molecules has long been pursued by both industry and academia. One of the central challenges is to realize carbon–carbon coupling with high selectivity for CO insertion. We report here a highly selective Au/ZnO composite catalyst for one-step oxidative coupling of CO with secondary amines, producing oxamides. The reaction is >99% selective under ambient conditions, which exhibits a subtle change of catalyst activity over ∼120 h in a fixed-bed reactor. A combination of microscopic and spectroscopic studies (including X-ray photoemission spectroscopy, X-ray absorption spectroscopy, CO-Fourier transform infrared spectroscopy, and aberration-corrected high-angle annular dark-field scanning transmission electron microscopy) and machine learning reveal that the active site is the Au–ZnO interface with a Au nanocluster attached to the ZnO support via nonstoichiometric ZnOx (x > 1) linkages. The reaction mechanism and key reaction intermediates were confirmed by density functional theory calculations and in situ diffused reflectance infrared Fourier transform spectroscopy signals. Our results open an avenue in heterogeneous catalysis to achieve the ambient-condition CO transformation by exploiting the interfacial synergistic effects.
✓ 已验证
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Jing Gu,Honggang Fan,Yazhuo Wang,Yuyuan Zhang,Haoran Yuan,Yong Chen
The thermal weight-loss characteristics and product distribution of the co-pyrolysis between xylan from corn cob (XC) and high-density polyethylene (HP) were investigated by thermogravimetry coupled with fourier transform infrared spectroscopy and mass spectrometry (TG-FTIR-MS) and pyrolysis gas chromatography/mass spectroscopy (Py-GC/MS). Moreover, the synergistic effects in the co-pyrolysis process were explored. The co-pyrolysis of XC and HP occurs in two stages. The first stage (220–350 °C) was the decomposition of XC, and the second stage (440–525 °C) was mainly attributed to the decomposition of HP. Co-pyrolysis caused the blends to decompose more easily. The synergistic effect was confirmed during the co-pyrolysis process. The co-pyrolysis process promoted the release of hydrocarbons (CH 4 , C 2 H 2 , C 2 H 6 , C 3 H 6 , and C 3 H 8 ) and aldehyde derivatives (CH 3 CHO and CHO + ) and decreased the production of H 2 and H 2 O. Moreover, co-pyrolysis suppressed the generation of CO 2 only when the content of HP was 75%. The Py-GC/MS results showed that the yield of oxygen-containing compounds decreased, and the yield of alkenes and alkanes increased. The increase in alkenes was greatest when the ratio of XC to HP was 1:3. This phenomenon could be attributed to the release of hydrogen radicals from mono-molecular and bi-molecular dehydrogenation reactions during the decomposition of HP. Thus, HP could be a hydrogen donor, providing hydrogen for xylan-derived oxygenates, which served as acceptors. A reaction mechanism for the co-pyrolysis of XC and HP was also proposed.
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Mingsheng Luo,Chenmeng Li,Qinglong Liu,Zhi Yang,Yatao Wang,Hongjuan Li
Direct hydrogenation of CO to alcohols through Fischer-Tropsch reaction process is taken great interest in recent years. In this study, a series of β-Mo 2 C/γ-Al 2 O 3 catalyst are prepared to investigate the influence of carbon and molybdenum precursor, calcination temperature, as well as the molar ratio of the carbon precursor to molybdenum precursor compounds on catalyst microstructures and the catalytic performance. The microstructure characteristics of the catalysts were examined with XRD, BET, ICP, SEM and CO-TPD. The performance test of the catalysts for syngas-to-alcohol was investigated in a fixed-bed reactor. Properly excessive amount of hexamethylenetetramine as carbon precursor calcined at a high temperature (≥700 ℃) favors the formation of high crystalline β-Mo 2 C on γ-Al 2 O 3 carrier. Catalysts with different amount of Mo were prepared to study the effect of active metal loading on microstructure and catalytic performance. The results show that the particle size of β-Mo 2 C and CO dissociation adsorption capacity, as well as the CO conversion increases with raised Mo loading. The selectivity of all higher alcohols reached the maximum when 25 % of Mo was loaded.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）