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
iScience
·
2025
·
IF 4.1
Hong Qian,Binxia Yuan,Yuhao Liu,Li Wang,Rui Zhu,Pengyu Dong
TiO 2 has low photocatalytic activity due to its easy recombination of photogenerated charges and low visible light utilization efficiency. This study utilized the keto-enol tautomerism principle of fructose in an alkaline environment to successfully obtain Cu 2 O/TiO 2 (CT), Cu 2 O/TiO 2 /Cu (CTC), and TiO 2 /Cu (TC) catalysts. As Cu(I) transformed into Cu(0), the bandgap narrowed, significantly enhancing visible light absorption. Photocatalytic tests showed that CT-0.15 exhibited the highest hydrogen production rate (279.53 μmol g −1 h −1 ), which was 25.18 times higher than that of TC-2. However, CTC-1 had the highest CO production rate (10.58 μmol g −1 h −1 ). Optoelectronic test revealed that CT-0.15 and CTC-1 had higher separation efficiency of photogenerated exciton. Density functional theory (DFT) calculations indicated that the change in the valence state of Cu influenced the reaction mechanism, with CT being favorable for the adsorption of H + in HER and CTC promoting the adsorption of CO 2 in carbon dioxide reduction reaction (CO2RR).
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12763-12778
·
IF 4
Qi Wen,Di Li,Chunyan Gao,Yuhang Xue,Lei Wu,Fang Song,Jun Zhou
In this paper, ultra-thin nanofiber PDI was obtained by self-assembly dispersion of commercial PDINH. A novel Co/Ni-MOF-74@PDI Z-scheme heterojunction photocatalyst material was constructed by a simple solvothermal method. XRD, SEM, TEM, FT-IR and other characterization techniques proved the successful preparation of the Co/Ni-MOF-74@PDI Z-scheme heterojunction photocatalyst material. By degrading chlortetracycline hydrochloride, it was found that the photocatalytic activity of Co/Ni-MOF-74@PDI was much higher than that of pure Co/Ni-MOF-74 and PDI. Subsequently, Co/Ni-MOF-74@PDI was used to activate H2O2 to further improve the degradation efficiency of chlortetracycline hydrochloride. It was found that the photocatalytic performance was greatly improved after the addition of 19.6 mM H2O2 to the system, and the degradation rate of chlortetracycline hydrochloride was 87% within 90 min. The electron transfer pathway and H2O2 activation mechanism of the Co/Ni-MOF-74@PDI composite photocatalyst were proved by free radical quenching experiments, electron paramagnetic resonance analysis and X-ray electron spectroscopy. Finally, the easy exfoliation point and degradation pathway of chlortetracycline hydrochloride were studied using density functional theory, UPLC-MS and toxicity evaluation software. It was found that the main active substances were h+, ˙O2, 1O2 and ˙OH, and the toxicity of chlortetracycline hydrochloride and its intermediates was evaluated.
研究领域:
材料科学
·
环境科学
·
光化学
·
催化
✓ 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
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 2
·740-751
·
IF 12.732
Lichong Peng,Yaxin Sun,Shiquan Guo,Congju Li
Oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) involve proton coupled electron transfer reaction (PCET), resulting in sluggish redox kinetics. At present, the development of high-efficiency bifunctional oxygen electrocatalysts is still a puzzling challenge. Herein, we propose a scalable strategy for embedding and beading ZIF-derived hollow Co–Nx nanocube cage dispersion implanted with porous carbonized nanofibers (EH/PCNFs and BH/PCNFs) through electrospinning and annealing. The cobalt species prevent themselves from agglomerating during the annealing process through the “fence” effect of the non-volatile Zn species, thereby synergizing with ligand volatilization to facilitate the formation of Co–Nx nanocube cages. Benefiting from the ultralong interconnected multi-layered carbon nanofiber matrix, the hollow Co–Nx nanocube cages can change the charge density and electron distribution of the carbon nanofiber matrix, endowing the carbonized nanofiber carrier with special surface polarization and accelerating the electrocatalytic kinetics. Remarkably, the integrated Li–O2 batteries (LOBs) based on BH/PCNFs and EH/PCNFs electrodes exhibit significantly decreased charge/discharge polarization (0.79 V) and a long-term cyclability (147 cycles) under a cut off capacity of 500 mA h g−1 at 200 mA g−1. This work might be beneficial for the practically viable design and manufacture of dual-function oxygen electrocatalysts.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2015
·
IF 5.528
Zhaobing Li,Zhi Chen,Yingying Xiang,Li Ling,Jingyun Fang,Chii Shang,Dionysios D. Dionysiou
Bromate formation in bromide-containing water through the cobalt (Co)-mediated activation of peroxymonosulfate (PMS) was investigated. Increasing the PMS dosage and the cobalt dosage increased the formation of bromate and bromate yields of up to 100% were recorded under the test conditions. The bromate yield increased to a maximum as the pH rose from 2.7 to 6 before decreasing by over 90% as the pH rose further from 6 to above 9. The bromate formation is a two-step process involving free bromine as a key intermediate and bromate as the final product. In the first step, apart from the known oxidation of bromide to free bromine and of free bromine to bromate by sulfate radicals (SO 4 − ), Co(III) produced from the oxidation of Co(II) by PMS and SO 4 − also oxidizes bromide to free bromine. The contribution of Co(III) to the bromate formation was verified with the addition of methanol and EDTA, a radical scavenger and a Co(III) ligand, respectively. In the presence of methanol, free bromine formation increased with increasing Co(II) dosage but no bromate was detected, indicating that Co(III) oxidized bromide to form free bromine but not bromate. In the presence of both EDTA and methanol, no free bromine or bromate was detected, as Co(III) was stabilized by EDTA to form the Co III EDTA – complex, which could not oxidize bromide. Mathematical simulation further suggested that Co(III) outweighed SO 4 − to oxidize bromide to free bromine. On the other hand, SO 4 − is essential for the oxidation of free bromine to bromate in the second step. In real water, the presence of NOM significantly decreased the bromate formation but caused the brominated organic DBP formation with high quantity. This is the first study to demonstrate the significant bromate formation in the Co/PMS system and the substantial contribution of Co(III) to the formation.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 10
·期 5
·1431-1443
·
IF 5.726
Zhaohui Teng,Shan Huang,Liang Fu,Heng Xu,Na Li,Qulan Zhou
In our research, rice husk ash (RHA) was employed as a catalyst support and Fe–Cu bimetallic compounds were employed as catalysts in the reduction of NO by CO. Rice husk ash contains abundant amorphous SiO2 and it would be a good catalyst support as indicated by the characterization results. Different combustion conditions were tested to obtain the appropriate rice husk ash. Characterization methods were employed to study its physical properties. The results of the catalytic activity testing experiment were highly in accordance with the characterization results. Fe2Cu1 based on rice husk ash had approximately 100% conversion rates for both NO and CO, which indicated the superiority of the rice husk ash and Fe–Cu oxides. Moreover, the O2 content, CO/NO ratio and SO2 had little influence on this new combination. This remarkable performance was due to the strong interaction between the rice husk ash and metal species. The results of our research will provide some instructions for the improvement of industrial denitrification.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 6
·3202-3210
·
IF 9.3
Wanbin Lin,Yihang Li,Manish Singh,Huibin Zhao,Rui Yang,Pei-Chen Su,Liangdong Fan
Reversible solid oxide cells (RSOCs) hold enormous potential for efficient direct CO2 reduction or CO oxidation in terms of exceptional faradic efficiency and high reaction kinetics. The identification of an active fuel electrode is highly desirable for enhancing the performance of RSOCs. This study explores the use of a alkaline metal dopant (Na) to modify the perovskite oxide of Na2x(La0.6−xSr0.4−x)FeO3−δ (2x = 0, 0.10, 0.20) materials with powerful CO2 chemical adsorption capacity, high oxygen ion conductivity, and low average valence of Fe sites for CO2/CO redox reactions. The experimental results indicate that the cells with the NaLSF0.10 fuel electrode achieve a current density of 1.707 A cm−2 at 1.5 V/800 °C and excellent stability over 120 hours at 750 °C for pure CO2 electrolysis, approximately 33.4% improvement over the pristine sample. When operated under a mixed CO–CO2 atmosphere under RSOC mode, the cell outputs the performance of 1.589 A cm−2 at 1.5 V and 329 mW cm−2 at 800 °C, and demonstrates relatively durable operation over 25 cycles. The addition of low valence sodium ions with high basicity and low electronegativity reduces the oxygen vacancy formation energy, increases the concentration of oxygen vacancies and modifies the electronic structure of LSF, thus enhancing CO2 adsorption, dissociation processes and charge transfer steps as corroborated by the detailed experimental analysis. Combined with the acceptable anti-carbon deposition capability, we prove here a feasible strategy and provide new insights into designing novel electrodes for SOEC/RSOCs to effectively convert CO2 with potential for renewable energy storage.
研究领域:
材料科学
·
电化学
·
能源存储
·
固体氧化物燃料电池
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Kun Gao,Mengxia Shen,Chao Duan,Chuanyin Xiong,Lei Dai,Wei Zhao,Wanli Lu,Shujiang Ding,Yonghao Ni
A reasonable design of the pore structure of carbon nanofiber-based electrocatalysts can effectively accelerate the slow kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In this study, we report an electrospinning method by adding supramolecular coordination polymers to selected polyacrylonitrile (PAN) and cellulose acetate (CA) spinning systems. Benefiting from the difference in the thermal decomposition temperature of each component during the pyrolysis process, CA was applied as a sacrificial template to prepare a high-efficiency ORR/OER bifunctional electrocatalyst (Co-N@PCNFs-0.2) with directional hollow channels and a hierarchical pore structure. This unique multichannel carbon nanofiber morphology and hierarchical pore structure led to abundant active sites while also boosting the electron transfer rates. Notably, applying Co-N@PCNFs-0.2 as an air electrode to Zn–air batteries results in a large specific discharge capacity of 884 W h kgZn–1 and a maximum power density of 151 mW cm–2.
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
危险品化学品经营许可证（带存储）