JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Hui Lv,Shifu Wang,Zuoyi Xiao,Chengrong Qin,Shangru Zhai,Guoxiang Wang,Zhenyu Zhao,Qingda An
Currently, hollow carbon spheres (HCS)-based supercapacitors are gained tremendous interest due to their excellent electrochemical property . However, the inferior structural stability and unsatisfactory space utilization restrict the applications for high power devices. Herein, a kind of novel N-doped HCS (N-HCS) with controllable shell numbers is constructed by layer-by-layer assembly of polydopamine (PDA) and polypyrrole (PPy) layers on carboxyl modified polystyrene (PS–COOH) spheres. Compared with single-shelled N-HCS, the optimize N-HCS with 4 shells (N-HCS-4) exhibits improved specific surface area from 43.9 m 2 g −1 to 1110.2 m 2 g −1 , which provides a large accessible surface area for the electrolyte, thereby facilitating the ion diffusion and electron transportation. Meanwhile, the doping heteroatom endows N-HCS with the additional pseudocapacitance . Very interestingly, the significant electrochemical properties of N-HCS at the varied coating sequence and number of PDA and PPy layers indicate the formation of the optimal microstructure, which could match with the electrolyte ion size for accelerating the capacitive response. The assemble asymmetrical supercapacitor displays a high energy density of 41.18 Wh kg −1 at a power density of 250 W kg −1 , and excellent cycling stability of 99.1% over 10,000 cycles due to the improved structural stability from the synergistic effect in different shells.
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高影响因子
RSC Advances
·
2014
·Vol. 5
·期 10
·7182-7191
·
IF 3.708
Bin Yang,Chengxiang Yu,Qingni Yu,Xingwang Zhang,Zhongjian Li,Lecheng Lei
Comparative studies of the textural properties of carbon xerogel (CX) and commercial activated carbon (AC) demonstrated that CX has higher total pore volume and pore diameter, whereas its adsorption capacity for Pb(II) ions in aqueous solution is lower. Herein, the purpose of the present study is to improve the adsorption performance by the introduction of N into the CX matrix on the basis of the extraordinary textural property. Accordingly, the surface chemistry, porous texture, and morphology of the obtained N-doped CX (NCX) were modified. The removal efficiencies of Pb, Zn and Cu by NCX were 1.97, 1.67, and 1.64 times of those by CX, respectively. It was found that the surface density of adsorbed metal ions per unit specific surface area of NCX increased as a linear function with the increase in the N content. The adsorption process of Pb(II) ions followed the pseudo-second-order kinetics and Langmuir model with a maximum adsorption capacity of 83.8 mg g−1, indicating that NCX would be a promising adsorbent for removal of heavy metal ions from water.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Quan Kong,Nanyu Fan,Siyi Chen,Xiaofen Wu,Lihua Liu,Ruifeng Lang,Zeyuan Gao,Hongtao Guan,Chengjun Dong,Gang Chen
The design and synthesis of non-noble bifunctional electrocatalysts with high efficiency for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is still ongoing for enhanced overall water splitting. Herein, the heterostructure N-doped nickel sulfide/cobalt sulfide (N-Ni 3 S 2 /CoS 2 ) catalyst was in situ growth on Ni foams (NF) via an electrochemical deposition method followed by rapidly vulcanizing process at low-temperature. Benefiting from the abundant interface, high conductivity of NF, large electrochemical surface area, N-Ni 3 S 2 /CoS 2 /NF catalyst exhibits excellent activity for both HER and OER. Low overpotentials of 245 and 100 mV can drive a current density of 10 mA cm −2 for OER and HER in 1.0 M KOH. Serving as the bifunctional catalysts, N-Ni 3 S 2 /CoS 2 /NF catalyst delivers the current density of 10 mA cm −2 at a very low cell voltage of 1.56 V in the water splitting reaction.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 11
·18371-18378
·
IF 5.2
Qiujun Hu,Junbiao Guo,Hanyang Zuo
Bismuth telluride (Bi 2 Te 3 )-based thermoelectric materials have been commercially utilized for refrigeration and energy conversion at room/near room temperature. However, n -type Bi 2 Te 3 compounds always exhibit inferior performance compared with their p-type counterparts, which is pronouncedly impeding Bi 2 Te 3 -based energy converters from further optimizations. Herein, a promising ZT value ( ZT = 1.33) was obtained in n-type Bi 2 Te 2.7 Se 0.3 (BTS) materials by using an interface engineering strategy to synergistically optimize the electron and phonon transport properties. In detail, ZrO 2 ceramic nanoparticles (NPs) were entered into BTS matrix to construct high-density heterogeneous interfaces. The heterogeneous interfaces strongly scatter phonons and lower energy carriers, leading to decreased thermal conductivity and increased Seebeck coefficient, while the electrical conductivity is not sacrificed due to the compromise of the slightly reduced carrier mobility by interfacial scattering and the increased carrier concentration by ZrO 2 NPs doping. A planar module consisting of 127 pairs of p-n single legs were assembled. At the temperature difference of 200 K, the output power and energy conversion efficiency reached 9.6 W and 6.2%, respectively. This strategy provides a feasible way to rationally design advanced n-type Bi 2 Te 2.7 Se 0.3 materials with excellent thermoelectric and mechanical properties induced by high-density heterogeneous interfaces.
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高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Lin Long,Zhenzhong Lan,Zhixiong Han,Yunfeng Qiu,Weixing Zhou
Endothermic hydrocarbon fuel has many advantages as a cooling medium in hypersonic aircraft; however substantial application has been greatly hindered due to easy coking, uncontrollable gas products, and low heat sink issues. Catalytic cracking of hydrocarbon fuel has been regarded as one of the most effective ways to improve the heat sink via modulating the cracking pathway. The incipient-wetness impregnation method was selected to load Co salts in commercial ZSM-5 in a large-scale manner; subsequent calcination in Ar gas resulted in Co3O4 nanosheet wrapped HZSM-5 composites. Salinization treatment was adopted to facilitate the dispersion of catalyst in a nonpolar solvent. The ratio of Brönsted/Lewis acidity decreased from 8.00 to 2.79 after modification by Co3O4 nanosheets. The synergistically catalytic effect between Co3O4 nanosheets and ZSM-5 was beneficial to the generation of a larger gas production rate with higher content of alkene, and thus resulting in a higher heat sink than benchmarked fuels. Catalytic cracking of n-decane (C10) in the presence of 0.1 wt % Co3O4 nanosheets@ZSM-5 could yield a heat sink as high as 4.64 MJ/kg at 758 °C, much higher than those of bare ZSM-5 (2.99 MJ/kg at 687 °C) and thermal cracking of C10 (3.77 MJ/kg at 728 °C). Meanwhile, the smart combination of Co3O4 nanosheets and commercial ZSM-5 could effectively suppress the coke deposition on the external surface of composites, thus resulting in efficient catalytic cracking at elevated temperatures for obtaining a higher heat sink.
研究领域:
催化化学
·
能源材料
·
化学工程
·
石油炼制
·
航空航天推进
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DOI
Nature Communications
·
2026
·
IF 15.7
Lai Dingbo,Yu Jia,Ma Zi-Ang,Ye Xiaolin,Wang Chaoxi,Zhang Junqing,Wang Tuo,Zhao Zhi-Jian,Zhang Peng,Gong Jinlong
The electrochemical C–N coupling of biomass-derived 5-hydroxymethylfurfural (HMF) with methylamine offers a promising sustainable route to value-added amines. However, achieving high selectivity remains challenging due to competing side reactions, including C = O hydrogenation and C–C dimerization. This paper describes tailoring the surface structure of Ag catalysts to modulate HMF adsorption and intermediate hydrogenation behavior and thus enhancing C–N coupling selectivity. Ag nanoparticles, predominantly exposing the (111) facet, exhibit higher selectivity compared with Ag nanocubes mainly enclosed by (100) planes. The Ag(111) facet favors the C–N coupling pathway by regulating both adsorption geometry and hydrogenation ability. In-situ Raman spectroscopy and density functional theory (DFT) calculations reveal that an η 1 (C)-aldehyde adsorption configuration, dominant on Ag(111), enhances carbonyl electrophilicity and facilitates C = O polarization, promoting nucleophilic attack by methylamine. In contrast, the η 2 (C,O)–aldehyde configuration, more common on Ag (100), stabilizes the C = O bond, limiting its reactivity. Moreover, Ag(111) shows enhanced imine hydrogenation activity, further improving amine selectivity. This study highlights the significance of facet-dependent adsorption modulation in steering reaction pathways and advancing sustainable electrochemical synthesis.
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PubMed
高影响因子
ADVANCED MATERIALS
·
2026
·
IF 26.8
Zhechen Fan,Shuhu Yin,Wenhao Miao,Yudie Zhou,Weiyi Zhao,Yixuan Yin,Hao Yu,Lin Lin,Lina Hou,Hao Wan,Ying Wang,Junjie Ge
Atomically dispersed Fe–N–C catalysts are regarded as promising alternatives to platinum-group-metal (PGM) catalysts for proton exchange membrane fuel cells (PEMFCs). However, their further development is hindered by inadequate utilization of active sites in membrane electrode assembly (MEA). Herein, we developed a high mass activity O–FeNC catalyst with high site density and enhanced site utilization. C═O groups function as hard base linkers, promoting the densification of FeN 4 sites through Lewis acid-base interactions. Moreover, they also direct interfacial alignment within triple-phase boundaries, leading to concentrated hydronium ions and accelerated oxygen permeation via regulated ionomer nanophase segregation. As a result, the obtained O–FeNC cathode delivered a current density of 66.45 mA cm −2 at 0.90 V iR-free , surpassing the US Department of Energy 2025 target (44 mA cm −2 at 0.9 V iR-free ), with a mass activity that is 59% higher than commercial Pt/C. The peak power densities reached 1.8 W cm −2 under H 2 –O 2 and 0.93 W cm −2 under H 2 –air, alongside demonstrated industrial scalability through gram-scale synthesis and a 500 W PGM-free cathode stack prototype.
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PubMed
高影响因子
TURKISH JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 1
·207-217
·
IF 1.4
JİANG ZHIJIE,FU SHUIYUAN,ZHAO WEI,LIU XVTANG,WANG FEI,CUI MINGYU,DONG LINYANG
Fabricating highly efficient Pd-based nanocatalysts with a well-defined structure is desired for the commercialization of direct ethanol fuel cell (DEFC). Herein, a series of hierarchical three-dimensional N-doped hollow graphene spheres (NHGS) supported dendritic PdCu alloy catalysts Pd$_{x}$Cu$_{(d)}$-NHGS (x: Cu/Pd theoretical molar ratio of 4, 2, and 1) are assembled by one-pot ascorbic acid reduction-immobilization method. Aiming to maximize the Pd utilization and realize the efficient ethanol electrooxidation, this novel electrocatalyst offers potent activity sites and promotes electron and ion kinetics simultaneously. Characterization indicates that the as-obtained Pd$_{4}$Cu$_{(d)}$ alloy nanoparticles with average sizes of approximately 55 nm are evenly dispersed on the NHGS supporting materials obtained by using the SiO2 nanospheres template strategy. Three catalysts all exhibit enhanced electrocatalytic activity, of which the Pd$_{4}$Cu$_{(d)}$-NHGS shows the highest mass current activity (2683 mA mg$_{Pd}$$^{-1}$), which is 2.59 times of the commercial Pd/C toward ethanol electrooxidation in alkaline medium. Based on the results, we believed that the Pd$_{4}$Cu$_{(d)}$-NHGS could exhibit extensive application prospect in alkaline DEFC. Key words:
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高影响因子
BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Zhiqin Li,Yuxin Kang,Tengran luo,Zegang Qiu,Zhuoyuan Li,Yanan Zhu
Ce reduced the charge density around Co and enriched defects on surface of catalyst. • Ce incorporation facilitates vanillin adsorption and H 2 activation at molecular level. • 9Co-1Ce/NC achieves 100 % vanillin conversion and 100 % selectivity of target product. • Co-Ce synergy promotes rate-determining C-O bond cleavage of two-step reaction pathway. The efficient conversion of lignin-derived oxygenates into fuels and high-value chemicals is pivotal for the development of renewable energy systems. A central challenge lies in the selective cleavage of the inherently recalcitrant C–O bonds in bio-oil model compounds under mild conditions. In this study, a multi-interface Co-Ce catalyst supported on nitrogen-doped carbon was successfully constructed via a bimetallic synergy and metal–organic framework (MOF)-derived strategy. The introduction of Ce exerted a multifunctional synergistic effect beyond that of a conventional promoter, realizing multi-scale modulation of the catalyst structure and performance. It modulated the electronic structure of Co active sites, thereby optimizing reactant adsorption and H 2 activation. Also, it suppressed the agglomeration of Co nanoparticles, thereby enhancing metal dispersion. Concurrently, it significantly increased the concentration of oxygen vacancies on the support surface, which collaboratively provided abundant active sites. Furthermore, it guided the formation of a hierarchical pore architecture conducive to mass transfer. Through this precise design and regulation of the active site microenvironment, the optimal catalyst achieved 100 % conversion of the model compound vanillin with 100 % selectivity toward 2-methoxy-4-methylphenol (MMP) under mild conditions, while also exhibiting excellent cycling stability and broad substrate applicability. This work not only demonstrates catalytic performance rivaling that of noble metals through the efficient synergy between non-noble metals (Ce and Co) but, more importantly, elucidates the underlying mechanism for the selective cleavage of C–O bonds. Download: Download high-res image (117KB) Download: Download full-size image
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yongzhi Zhao,Gengchen Bai,Wenhe Yu,Jianfang Liu,Baorui Jia,Xuanhui Qu,Mingli Qin
The design of durable and efficient non-precious metal catalysts for the oxygen reduction reaction (ORR) is crucial for advancing fuel cell and metal–air battery technologies. Single-atom catalysts (SACs) have attracted significant attention owing to their high activity and atom utilization efficiency. However, conventional Fe–N–C SACs suffer from Fenton-related side reactions, while traditional carbon supports are susceptible to oxidative degradation under high potentials. Herein, we report a Mn single-atom catalyst (Mn–N–D) anchored on a partially graphitized sp 2 /sp 3 carbon support derived from low-cost industrial diamond. The partial transformation of the sp³ carbon surface into sp² carbon generates conductive domains that stabilize atomically dispersed Mn–N 4 moieties. The optimized Mn–N–D catalyst exhibits enhanced alkaline ORR performance, delivering a half-wave potential of 0.831 V vs. RHE. Experimental and density functional theory (DFT) analyses reveal the pyridinic-N-coordinated Mn–N 4 configuration serves as the primary active site, facilitating O–O bond cleavage and promoting the four-electron reaction pathway. This work provides a cost-effective strategy for constructing high-performance SACs through the synergistic integration of robust sp 3 carbon with conductive sp 2 carbon domains.
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高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 5.2
Yu Huang,Xiao Li,Guoping Zhu,Zhennan Wang,Pooya Jafari,Xiaoning Song,Jiabing Feng,Zongmin Zhu,Siqi Huo,Pingan Song
Despite great advances, it remains a grand challenge to design a fire retardant for the creation of transparent fire-retardant epoxy resin (EP). To address this issue, a phosphorus/nitrogen/sulfur-containing ionic flame retardant, TD, composed of a diphenylphosphinate unit and a 2-thiophenethylammonium unit, was synthesized and incorporated into EP. The EP composite containing only 3 wt % TD (0.25 wt % phosphorus) achieved a vertical burning (UL-94) V-0 rating, and the limiting oxygen index (LOI) increased to 24.7%. Cone calorimetry results showed that, relative to neat EP, the EP/5TD composite achieved notable reductions in heat and smoke generation. Its peak heat release rate (pHRR) and total heat release (THR) decreased by 44.0% and 24.0%, while the peak yields of carbon monoxide (pCOP) and carbon dioxide (pCO2P) decreased by 23.5% and 58.6%. Notably, TD not only significantly enhanced fire safety and mechanical properties of EP but also effectively maintained thermal properties and optical transparency. The flame-retardant efficacy of TD was ascribed to the combined action of P, N, and S, which enabled multiple mechanisms, including condensed-phase char barrier formation, gas-phase dilution/cooling, and radical scavenging effects. This work develops highly effective multielement flame retardants for preparing fire-safe epoxy resins with superior comprehensive performances.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·Vol. 143
·期 40
·e71304
·
IF 3.1
Kang Jiaoyue,Chao Yan,Yan Kou,Lin Zhou,Tao Liu,Mao Chen
Epoxy resin (EP) is one of the most widely used thermosetting materials; however, its high inherent flammability severely restricts its practical applications. To address this issue, a novel nitrogen/phosphorus (N/P)-containing hexafunctional monomer (HCPB) was synthesized and employed to partially substitute diglycidyl ether of bisphenol A (DGEBA) in the preparation of flame-retardant epoxy thermosets (EP/HCPB), using polyetheramine (D230) as the curing agent. The effects of HCPB content on the thermal stability, mechanical strength, and flame retardancy of EP were systematically investigated. Specifically, the EP-HCPB 15 composite with 15.00 mol% HCPB achieved a tensile strength of 48.87 MPa, a limiting oxygen index (LOI) of 30.5%, a UL-94 V-0 classification, and a glass transition temperature ( T g ) of 58.11°C. Furthermore, the flame-retardant mechanism of HCPB in the epoxy matrix was systematically elucidated, involving both gas-phase free-radical quenching and condensed-phase charring effects. This work provides a facile and effective strategy for the design and preparation of high-performance flame-retardant epoxy thermosets.
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高影响因子
危险品化学品经营许可证（带存储）