Materials Today
·
2025
·
IF 22
Hang Yue,Sichen Huo,Xinyu Wang,Mingyi Wang,Heyuan Sun,Yanjie Chen,Ying Dai,Mingyang Liu,Jinlong Zou
Due to restrictive linear relationship between intermediates in adsorption evolution mechanism (AEM) of oxygen evolution reaction (OER), a higher overpotential must be overcome for conversion of *O to *OOH. Activating lattice oxygen mechanism (LOM) can address the AEM’s challenges by facilitating O-O coupling. However, via LOM pathway, extracting electrons from metal-oxygen (M−O) bonds usually results in structural instability. Herein, we propose an effective method to stabilize LOM-catalysts by combining cerium dioxide with cobalt phosphide (CeO 2 /CoP heterostructure). CeO 2 acts as an electron buffer to retain/provide electrons at different stages, while CoP with strong Co-P covalency enhances structural/catalytic stability in strongly-alkaline conditions. CeO 2 /CoP exhibits an OER overpotential of only 225 mV at 10 mA cm −2 . Initially, CeO 2 acquires electrons from CoP to accelerate surface reconstruction and form high-valence Co δ+ (CoOOH). Then, CoOOH acquires electrons from the 4 f -orbital of Ce through the Ce-O-Co interface, rather than from the M−O bond, thus ensuring OER stability. For water splitting, bifunctional CeO 2 /CoP-assembled electrolyzer requires a cell-voltage of only 1.54 V to achieve 10 mA cm −2 and retains 89.5 % of its activity after 72 h of cycling. It highlights that leveraging electron-buffering metal species can enhance the LOM stability, thereby enabling its application in bifunctional electrocatalysis.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Yangsong Chen,Dekang You,Xin Pan,Youfang Zhang,Zhao Wang,Dean Shi,Weiwei Lei,Liqun Zhang,Robert K. Y. Li
The widespread utilization of elastomers causes severe environmental and health concerns, prompting the research of biobased high-performance elastomers for a sustainable elastomer industry. This work attempts to develop biobased elastomers with comparable properties with high-performance petroleum-based synthetic rubbers and natural rubber. A series of poly(1,5-pentylene itaconate-co-furanoate-co-ε-caprolactone) (PPeIFCL) polyesters were synthesized by using transesterification and melt polycondensation methods utilizing biomass-derived substituents. PPeIFCL polyesters were characterized in terms of chemical structure and thermal, mechanical, and gas barrier properties. PPeIFCL polyester macromolecule chains with an inherent angle of 129.4° between the carboxylates on furan moieties, combining the asymmetric poly(ε-caprolactone) diol oligomer and “odd–even” effect of the 1,5-pentanediol structure, provided adequate chain entanglements and strengthened their tensile strength and elasticity as validated by the mechanical tests and low-field NMR. Furthermore, PPeIFCLs exhibited impressive gas barrier properties compared to petrobased butyl rubber.
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CARBON
·
2025
·
IF 11.6
Qi Gan,Jiajun Zhang,Yan Cao,Shuang Xu,Peng He,Huiquan Li,Renlong Liu,Liguo Wang
Non-noble metal-based catalysts are highly desired for the catalytic hydrogenation of nitroaromatics. Here we reported a catalyst of Co 1 /Co n @NCNS prepared with raw materials for efficient hydrogenation of nitrobenzene (NB), in which the Co nanoparticle (Co NP ) was tightly coated in a nitrogen-doped graphite carbon shell, and the Co single atom (Co SA ) was uniformly anchored on graphite support. The catalyst achieved a conversion of NB for over 99% under mild conditions at 50 °C and 10 bar. The catalyst was able to consistently maintain over 90% conversion and 99% selectivity for 100 h, and exhibited outstanding catalytic activity and selectivity (>99%) towards the reduction of various nitroaromatics, even though for halogen-containing substrates. The superior catalytic performance resulted from the synergy between the internal Co NP and the surface Co SA on the nitrogen-doped carbon shells. Both Co NP and Co SA synergistically facilitated electron transfer to nitrogen atoms in the carbon framework, and rendered them catalytic activity during the hydrogenation.
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Materials Today Communications
·
2021
·
IF 3.383
Xiao-Hui Yang,Kai-Fei Wang,Kuo-Chih Chou,Guo-Hua Zhang
Fine grained WC-Co-Ni cemented carbides with a low binder content have been successful manufactured via the powder metallurgy method. The WC-Co-Ni composite powder with homogeneous distributions of Co and Ni was synthesized by chemical co-precipitation with the raw materials of WC powder, oxalic acid and chlorides of Co and Ni. In this study, the effects of cobalt and nickel contents on the properties of cemented carbides were investigated systematically. The experimental results demonstrated that the alloy prepared by vacuum sintering had uniform grain size distribution and no abnormal growth of WC grains. When the cobalt content was 4 wt% and 5 wt%, the obtained composites almost completely consolidated with excellent hardness and fracture toughness. Among them, for the sample WC-4 wt%Co, the relative density could reach 99.37%, and the Vickers hardness and fracture toughness were 2010 HV 30 and 8.55 MPa·m 1/2 , respectively. When Ni was added to replace part of Co, the relative density of WC-Co-Ni decreased and the fracture toughness was improved without basically sacrificing the hardness. For the sample WC-2 wt%Co-2 wt%Ni, the hardness decreased to 1921 HV 30 , while the fracture toughness increased to 8.97 MPa·m 1/2 .
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BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Le Gong,Rongxiang Zeng,Yiqing Shi,Minggong Yu,Xianchun Yu,Delin Sun
Exploring new electrode structures and co-doped composite biomass material electrodes is considered to be an effective way of developing cheap, efficient carbon-based supercapacitors. A bamboo-based sandwich-structured matrix was prepared from thin bamboo veneer and bamboo fiber by pretreatment with H 3 PO 4 and Co 2+ -catalyzed graphitization. The pore structure was modulated by hydrothermal activation with NaOH and electrodeposition of carbon nanotubes (CNTs) to obtain CNTs modified, Co/P co-doped sandwich-structured woodceramics electrode (CNT@Co/P). It not only has an obvious sandwich structure, but also retains the natural structural characteristics of bamboo. The specific capacitance of the resulting electrode (CNT@Co/P-20) is as high as 453.72F/g using 1 wt% of carboxylated multi-walled carbon nanotubes (CMWCNT) solution as the deposition electrolyte at a current density of 0.2 A/g for 20 min at room temperature. When the power density is 500 W/kg, the energy density reaches 21.3Wh /kg, showing a good electrochemical performance.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yuqiu Fan,Dawei Liu,Haipeng Wan,Xingyu Liu,Jun Wang,Kun Xiong
For rapid and efficient removal of tetracycline (TC), a new cobalt (Co) and manganese (Mn) co-doped zinc ferrite (CoMnZFO) photoanode was synthesized in this study. Compared to the pure zinc ferrite (ZFO), CoMnZFO exhibited stronger enhanced light harvesting ability and a narrower band gap. Although there were oxygen vacancies in both CoMnZFO and ZFO lattices, CoMnZFO possessed more double-exchange interaction pathways in comparison with ZFO. Besides the Fe 2 + /Fe 3+ pathway, CoMnZFO also had the Mn 3+ /Mn 4+ pathway, which facilitates the transfer of photogenerated electrons ( e - ) and holes (h + ), thereafter enabling CoMnZFO better photoelectrocatalytic (PEC) activity. Since CoMnZFO had a significantly smaller Helmholtz layer resistance than ZFO, it enhanced TC adsorption onto its surface. Exposed to simulated solar light for 12 min, CoMnZFO was able to make the complete degradation of TC (20 mg/L, 70 mL) when a voltage of 0.2 V was applied, while ZFO only achieved a TC degradation rate of 50.85 ± 5.77 % under the same condition. In addition, CoMnZFO achieved a TC mineralization rate of 41.89 ± 1.72 %, while that of ZFO was 13.87 ± 1.94 %. Furthermore, a quantitative structure-activity relationship (QSAR) method was applied to evaluate the ecotoxicological impact of the degradation products. The results demonstrate that the toxicity and mutagenicity of TC were weakened after experiencing the PEC treatment of CoMnZFO. Overall, this work offers a rapid and efficient way for PEC removal of TC-contaminated wastewater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yuping Gai,Wei Deng,Junbo Hu,Dan Li,Wenshuo Xie,Xiang Li,Jingjing Zhang,Dewu Long,Fei Jiang
The preparation of stable electrocatalyst for oxygen evolution reaction is of the utmost importance to realize high performance water decomposition reaction . Metal-organic framework (MOF) nanostructures have become promising materials. Herein, we report three kinds of electrocatalysts with different structures and properties for the oxygen evolution reaction, which were constructed by using different binding sites of three kinds of ligands following a mechanism which involved only *O and *OH species as intermediates. CoFeBTC-MOF shows excellent overpotential η = 261 mV at 10 mA cm −2 (1.481 V vs. RHE), Tafel slope of 59.29 mV dec −1 and pretty excellent stability (48 h of continuous testing), making it become one of the best acid-resistant catalysts for oxygen evolution reaction. The DFT calculations show that there are different ways to transfer electrons . In addition, the coupling effect between Co and Fe metals is the key to regulate the electrocatalytic activity , confirming the cooperative catalysis mechanism with a reduced energy barrier.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Min Zhao,Ziang Zhao,Yuan Lyu,Wei Lu,Ming Jin,Tao Liu,Hejun Zhu,Yunjie Ding
Suitable metal–support interaction is of great significance for the supported Fischer–Tropsch catalyst. Herein, we synthesized a series of porous spinel MAl2O4 (M = Co, Mg, Zn) together with Al2O3, via a sol–gel method and used them as supports for the Co-based Fischer–Tropsch synthesis (FTS) catalyst to investigate the influence of metal–support interaction on Co dispersity, reducibility, and catalytic performance. The catalytic performance showed that 15Co/CoAl2O4 had the highest activity and C5+ selectivity, as well as favorable stability during 1000 h lifetime testing. The catalysts were characterized by physisorption, chemisorption, HRTEM, XPS, and TPSR. The results indicated that 15Co/CoAl2O4 showed weaker metal–support interaction than 15Co/MgAl2O4 and 15Co/Al2O3, which was considered as the key factor for its higher reducibility and CO dissociation ability, contributing to the higher CO conversion. The higher Co dispersity on CoAl2O4 resulted from the smaller particle size of Co species on CoAl2O4, contributing to the higher activity of 15Co/CoAl2O4 than that of 15Co/ZnAl2O4. The higher C5+ selectivity on 15Co/CoAl2O4 and 15Co/ZnAl2O4 than that on 15Co/MgAl2O4 and 15Co/Al2O3 was verified to benefit from the appropriate H2/CO adsorption ability, which was significantly affected by metal–support interaction.
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ENERGY & FUELS
·
2025
·
IF 5.3
Yingrui Wang,Guanzheng Yang,Ming Chao,Jiaqing Zhao,Wen-tao Wang,Jin Yan,Qunying Wang,Ruizhi Yang
The oxygen reduction reaction (ORR) is a critical reaction in many renewable energy conversion and storage systems, such as fuel cells and metal-air batteries. High price, poor stability, and scarcity of Pt-based electrocatalysts, which are commonly used for ORR, limit the development of fuel cells and metal-air batteries. Transition-metal and nitrogen codoped carbons (M–N–C) are deemed as promising alternative electrocatalysts for ORR. Nevertheless, achieving sufficient ORR activity with M–N–C still faces great challenges. Here, cobalt (Co)-decorated Co–N–C coupled with MXene (Co/Co–N–C@MS-MXene) catalysts are successfully prepared via an in-situ construction of ZIF-derived Co–N–C at the surface of MXene etched by a Lewis acid molten salt. The as-synthesized Co/Co–N–C@MS-MXene delivers a superior ORR catalytic activity with a half-wave potential of 0.75 V vs RHE and a diffusion-limiting current density of 5.1 mA cm–2. A 4-electron transferring process and high stability are enabled. The excellent ORR performance can be attributed to the highly active Co-decorated Co–N–C and strong electronic coupling of Ti–O–Co between Co–N–C and MS-MXene, which promote the catalytic kinetics of ORR. This work demonstrates a universal, efficient, and green approach for the in-situ construction of active sites on MXene substrates.
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CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3829-3838
·
IF 2.3
Wang Mingyue,Li Ting,Tian Yuhao,Zhang Jiarong,Cai Weijie
To develop high-performance catalysts for greenhouse gas CO 2 reforming with ethanol (EDR) is progressively inspired by the urgent requirement of CO 2 elimination in order to meet with the sustainable development. In this work, the bimetallic Co(Ni)/ZnO catalyst derived from MOFs was investigated in detail with a focus on the effect of Ni dopant. The EDR results indicated that the bimetallic Co(Ni)/ZnO catalyst presented better activity as well as less formation of byproducts in comparison with the monometallic Co/ZnO catalyst. 100% of ethanol conversion was obtained at 500 °C for Co(Ni)/ZnO versus 650 °C for Co/ZnO. Moreover, no acetone formation was observed over Co(Ni)/ZnO catalyst while the concentration of acetone in Co/ZnO was as high as 10 mol%. Characterization results depicted that the strong synergistic effect between Ni and Co in Co(Ni)/ZnO catalyst might greatly stabilize active metal cobalt with smaller particle size, improve the reducibility and facilitate the generation of oxygen defects, thereby enhancing the catalytic performance. To a certain extent, this work might contribute to the design of efficient catalysts for other catalytic applications. Graphical
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Chaocheng Liu,Xucai Kan,Feng Hu,Xiansong Liu,Shuangjiu Feng,Jiyu Hu,Wei Wang,Khalid Mehmood Ur Rehman,Mudssir Shezad,Cong Zhang,Haohao Li,Shengqiang Zhou,Qiuyue Wu
M-type strontium hexaferrites is a vital functional material , Co-Ti co-substitution is one of the most effective ways to regulate its performance to meet the desired requirements exactly. Herein, we report the synthesis, microstructure, permeability, magneto-thermal and magnetic properties of Co-Ti substituted SrM-based hexaferrites . FT-IR spectra and XPS survey confirm that hexagonal crystal structure is formed completely, which are correlate closely with the results of Rietveld refinement of XRD patterns . M ( T ) curves illustrate that T p decreases from 323 K to 276 K induced by the specific substitution. M ( H ) branches show M s increases slightly while H c decreases rapidly with increasing x , and the sample performs as soft magnetic properties when x ≥ 1.00. In addition, besides the imaginary permeability ( μ '') can be reduced obviously by substituting cobalt-titanium, the characteristics of low core loss ( P cv ) and high quality factor ( Q ) for the sample are performed thoroughly, indicating the excellent performance in the field of multilayer inductors.
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Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-13
·
IF 23.655
Ban Chaogang,Duan Youyu,Wang Yang,Ma Jiangping,Wang Kaiwen,Meng Jiazhi,Liu Xue,Wang Cong,Han Xiaodong,Cao Guozhong,Gan Liyong,Zhou Xiaoyuan
The g-C 3 N 4 isotype heterojunction was synthesized for photocatalytic CO 2 reduction, which exhibits an impressive activity and outstanding stability.
The isotype heterojunction presents more favorable charge separation and transfer performance than the single components.
The enhanced photogenerated charge dynamics in isotype heterojunction facilitates the production of key intermediates and thus the whole reaction kinetics.
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