Materials Today Chemistry
·
2025
·
IF 6.7
Yuansen Xiao,Huimin Li,Zheng Wang,Zhihan Liu,Chenyang Li,Bin Wu,Longfei Yan,Huidong Zheng,Fuweng Zhang
Borneol synthesis faces challenges from co-generated impurities (isoborneol/camphor) and competing dehydration/dehydrogenation during isomerization. Here, Co/TiO 2 is demonstrated as a selective catalyst for isoborneol-to-borneol isomerization, effectively suppressing structural degradation. Controlled acidity and cobalt dispersion are identified as critical factors: TiO 2 's moderate acidity promotes isomerization, while strongly acidic supports (e.g., Mordenite) favor dehydration to camphene. Reduced cobalt particle size enhances active-site accessibility, lowering activation energy and boosting borneol yield. A one-pot two-step process achieves >62 % borneol content with <0.5 % camphor, meeting ChPC purity standards. This strategy bypasses traditional purification bottlenecks, offering a scalable route for high-purity borneol synthesis. The mechanistic insights into acid strength and metal dispersion provide a framework for rational catalyst design in industrial isomerization applications.
研究领域:
催化
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有机化学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·
IF 6
Mohit Kumar,Bhimanaboina Ramulu,Jae Su Yu
To produce clean and green hydrogen energy from electrolytic water, better electrocatalytic materials need to be developed. Herein, we reported the development of a Ti3C2 MXene@Ni/Co sulfide hybrid material for the use in hydrogen evolution reaction (HER) process, which is effective and stable. The shape of metal sulfide and its interactions with Ti3C2 MXene caused electronic coupling. This increased both the exposed metal sulfide's active edge sites and the charge-transfer speed. When compared with pure MXene and Ti3C2 MXene@NiS nanostructure, Ti3C2 MXene@Co4S3 exhibited outstanding electrocatalytic activity and stability in the HER process. The unique properties of the skeletal structure and the robust interface interaction between Co4S3 and MXene are responsible for the superior performance of Ti3C2 MXene@Co4S3 in the HER process. Our research offers a practical method to synthesize specialized nanostructures for electrocatalysis, electronics, and other applications.
研究领域:
材料科学
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能源科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Pengfei Zhang,Yaoda Liu,Tingting Liang,Edison Huixiang Ang,Xu Zhang,Fei Ma,Zhengfei Dai
Efficient, inexpensive and stable electrocatalysts are challenging and desperately required in order to complement the water electrolysis of noble metal catalysts. Herein, a porous nitrogen-doped carbon wrapped Co-Mo 2 C dual Mott–Schottky heterostructure has been successfully fabricated by carbonization of Co-Zn bimetal metal-organic framework (MOF) for water electrolysis. The heterostructure is found to feature with Co and Mo 2 C nanoparticles uniformly encapsulated in the highly porous leaf-like N-doped carbon nanosheet matrix. Such a thin porous dual-Mott–Schottky configuration can afford abundant surface active sites and the boosted electron transfer to promote the water splitting. As for hydrogen/oxygen evolution reaction (HER/OER), it has demonstrated fast kinetics and low overpotentials of 92 mV (HER) and 338 mV (OER) at a current density of 10 mA cm −2 in 1 M KOH. Furthermore, the overall water splitting is stably delivered with a low cell voltage of 1.68 V at 10 mA cm -2 in 1 M KOH. Density function theory (DFT) calculations demonstrate that the interface correlation is favorable to water transfer by electron and speeds up adsorption and water dissociation. The work here opens up interesting possibilities for the rational design and innovation of MOF derived Mott–Schottky electrocatalysts for highly efficient water electrolysis.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
Nanoscale
·
2012
·Vol. 4
·期 24
·7832-7841
·
IF 5.914
Hongwen Huang,Liqiang Zhang,Kewei Wu,Qing Yu,Ru Chen,Hangsheng Yang,Xinsheng Peng,Zhizhen Ye
A controllable synthesis of various morphologies of CuO nanostructures with tuning by hetero-metal cations has been developed in aqueous solution at room temperature. The morphologies of CuO can be engineered from nanosheets to nanoparticles with different length ratios of the long axis to the short axis. The formation of many metal–ion complexes plays an important role in slowing the release rate of OH− and affects the reaction kinetics further. We found that the effect of hetero-metal cations on the final morphology of the CuO nanostructures was the same as that of the cooling temperature. A series of temperature-controlled experiments demonstrated this. Furthermore, among all the synthesized CuO nanostructures, the fascinating colloidal mesoporous CuO quasi-monocrystalline nanosheets prepared at 25 °C with a thickness of ca. 10 nm and large specific surface area of 80.32 m2 g−1 is investigated intensively. These CuO nanosheets demonstrate a superior catalytic activity for CO oxidation, with features of high CO conversion efficiency (47.77 mmolCO g−1CuO h−1 at 200 °C), which is close to that reported for previously investigated supported-CuO catalysts, and a low apparent activation energy Ea (53.3 kJ mol−1).
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2023
·Vol. 87
·期 5
·1202-1213
·
IF 2.7
Liu Zhenzhong,Wu Yang,Wan Siwen,Wang Boyan,Ji Hongliang,Xiang Xiaofang
View large Download slide View large Download slide Close modal Compared with the common synthesis methods of metal-organic frameworks (MOFs), Co/Cu-based bi-MOFs composite catalyst Co X Cu (10− X ) -MOFs ( X = 2, 4, 6, and 8) was prepared by a facile synthesis method at room temperature. The bi-MOFs composite catalyst was characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The removal ability of sulfamethoxazole (SMX) by different Co:Cu rate bi-MOFs composite catalysts, single Co-based MOFs (zeolitic imidazolate framework-67, ZIF-67), and Cu-based MOFs (Hong Kong University of Science and Technology-1, HKUST-1) were investigated and the effects of peracetic acid (PAA) concentration, catalyst dosage, the common interfering substances (Cl − , HCO 3 − , SO 4 2− , HA) in water, and SMX removal were investigated. Through the analysis of different free radical scavengers and the changes of surface elements before and after the reaction, the oxidation mechanism was further explored, and the stability of Co 4 Cu 6 -MOFs was explored through repeated recycling. The experimental results demonstrate that Co 4 Cu 6 -MOFs have a high catalytic activity for PAA. Co 4 Cu 6 -MOFs/PAA show the best removal effect of SMX under neutral conditions and the presence of Cl − and HCO 3 - can promote the removal of SMX. Co 4 Cu 6 -MOF composites were synthesized and used for SMX removal. Application of PAA activation catalyst to generate R–O• for SMX removal. The effects of different environmental factors on the removal of SMX were discussed.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 43
·期 2
·658-670
·
IF 8.8
Peng Jia-Qi,Wei Yuan-Yuan,Liu Dong-Ming,Li Yun,Hu Bin,Huang Bin,Yang Jian-Wen,Xiao Shun-Hua,Wang Ren-Heng
Ultra-high nickel layered oxide cathode material with high energy density is the most promising material to improve the electrochemical performance of lithium-ion batteries (LIBs). However, the poor structural stability and severe surface/interface side reactions of the material lead to poor rate performance and cyclic stability, which limits its application in practice. In this paper, the dual-modification strategy of Co doping and La 2 O 3 coating is used to meet the above challenges. Co doping can effectively widen layer spacing and reduce Li + /Ni 2+ mixing, and La 2 O 3 coating can effectively eliminate the residual alkali on the surface of active material, inhibit the thickening of cathode electrolyte interphase (CEI) film and reduce surface/interface side reactions. Therefore, the modified material (NM90-CL) with excellent electrochemical properties is achieved through the synergistic enhancement of Co doping and La 2 O 3 coating. Its capacity retention rate can reach 77.9% after 200 cycles at 1.0 °C and 75.7% after 200 cycles at 5.0 °C. Its reversible capacity can up to 153.5 mAh·g –1 at 10.0 °C. This dual-modification strategy will provide theoretical guidance and technical support for the synthesis of other high-performance electrode materials. Graphical abstract
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhicai Yu,Lele Huang,Mi Zhou,Jie Xu,Jianchao Ma,Yuhang Wan,Qing Jiang,Xueru Qu,Hualing He
Early fire warning represents an effective mean in the face of fire that can remind people in timely manner to adopt effective countermeasures before the occurrence of fire. Despite the encouraging progress of current early fire-warning sensors, a more sensitive monitoring of early fires in multiple aspects remains challenge. Herein, a dual-mode core-sheath structured SnO 2 /MoS 2 @MXene@ANFs (SMA) early fire warning sensor fiber was prepared by coaxial wet spinning technology. The core-layer of SMA fiber comprised the thermoelectric material Ti 3 C 2 T X MXene, whereas the shell-layer comprised the gas-sensitive SnO 2 /MoS 2 and silver nanowires (Ag NWs) along with aramid nanofibers (ANFs). The robust and flame-retardant ANFs served as protective shell, safeguarding the stability and flexibility of the temperature and gas sensing functions within the fiber. Based on the thermoelectric performance of MXene, there is a linear relationship between the output voltage and temperature difference of SMA fiber, which can achieve wide range of temperature sensing from 50 to 300 ℃ and accurately identify abnormal temperature increases in the environment. Simultaneously, The bridging effect between one-dimensional Ag NWs and SnO 2 /MoS 2 enhances the sensing capability of fiber for CO (R 0 /R = 1.43@100 ppm). In addition, an early fire warning system based on SMA fiber has been established, which can sensitively detect the flames (≤4 s). This system can also be used for monitoring CO gas in fire environments, guiding firefighters’ rescue actions, expanding the application scope of early fire warning sensors in the past, and opening up new directions for the development of intelligent early fire sensors in the future.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CORROSION
·
2023
·Vol. 80
·期 2
·187-196
·
IF 1.6
Li Bowen,Pan Fengze,Pan Chengyu,Lv Tianyi,Wang Xiaotian,Ju Xiang,Gong Kaifei,Zou Wenkai,Zheng Chuanbo
The Ag-Ni-Co alloy coating is prepared in the low eutectic solvent system by pulsed power supply technology. Infrared spectroscopy and cyclic voltammetry are used to confirm that the addition of metal salts does not change the low eutectic solvent system. When the current density is 1 A/dm 2 and the plating time is 40 min, the plating grain is mainly spherical; the coating is uniform and dense. After testing, the surface-specific resistance of the plating is only 1.295 mΩ·cm 2 , the microhardness reaches 214.8 HV, and the wear rate reaches 3.1. The corrosion resistance of the plating and the substrate is analyzed by a combination of macroscopic electrochemistry and microarea electrochemistry, and the results show that the corrosion potential of the plating reaches −0.141 V, and the corrosion current density reaches 1.299 × 10 −7 A/cm 2 . The corrosion resistance of the plating is much greater than that of the substrate.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 9
·
IF 12.5
Mengxue Huang,Xuya Zhu,Wenwen Shi,Qianqian Qin,Jie Yang,Shanshan Liu,Lifang Chen,Ruimin Ding,Lin Gan,Xi Yin
Nitrogen-coordinated metal sites (MNx) in metal- and nitrogen-codoped carbon (M-N-C) catalysts offer promising electrocatalytic activity, but selective synthetic design of MNx sites with specific coordination environments remains challenging. Here, we manipulate the formation statistics of MNx sites by using sacrifice alkali metals (AM = Li, Na, and K) to form metal vacancy-Nx carbon (AM-MVNx-C) templates, which are used to direct the solution-phase formation of CoN4 sites in Co-N-C catalysts. We build a probability weight function based on the embedding energy of M in MNx sites as the descriptor for MNx formation statistics, and we predict that the alkali metals are prone to induce the formation of MVN4 sites. By coordinating Co2+ ions with AM-MVNx-C templates, we synthesize Co-N-C with CoN4 sites, demonstrating remarkable oxygen reduction activity in anion exchange membrane fuel cells. These results highlight the statistical thermodynamics of MNx formation and open up the possibility for the rational design of complex M-N-C electrocatalysts with well-defined MNx sites.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Kaiyue Chen,Xingkun Wang,Canhui Zhang,Ren Xu,Huanlei Wang,Lei Chu,Minghua Huang
Breakthroughs in the design of robust bifunctional oxygen reduction/evolution reaction (ORR/OER) catalysts could put Zn–air batteries performance to the summit but remain full of challenges. In this work, the MnS phase was deliberately introduced into the Mott–Schottky Co/Co 9 S 8 for engineering a three-phases Co/Co 9 S 8 /MnS heterojunction on defect-rich N-doped mesoporous carbon substrate (Co/Co 9 S 8 /MnS-NMC). It affords abundant three-phases heterostructure interfaces that effectively accelerate the electron transfer and trigger further electronic structure reconfiguration, thus advancing the bifunctional ORR/OER activities. Benefiting from these structures, the Co/Co 9 S 8 /MnS-NMC possesses a half-wave potential of 0.84 V toward ORR and a low overpotential of 330 mV toward OER at a current density of 10 mA/cm 2 , catching up with those of commercial Pt/C and RuO 2 catalysts. It also endows the Zn–air batteries with a good power density, round-trip efficiency, and robust stability over 750 h, showcasing the promising potential in practical applications. This work not only provides a facile strategy to construct the three-phases heterojunction catalysts but also sheds light on developing the efficient and robust nonprecious metal-based bifunctional ORR/OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yan Wang,Xiaochuang Di,Xiang Gao,Xinming Wu,Ping Wang
Lightweight and high-efficiency microwave absorbers have received considerable focus in military as well as civil fields. In this work, a unique method was employed to synthesize the Co@C polyhedrons covalently-grafted on magnetic graphene derived from MOF via amino reaction, followed by reduction and high-temperature pyrolysis processes. The results demonstrate that after a series of reaction procedures, Co@C polyhedrons are could be successfully linked to the magnetic NRGO by esterification reaction. The microwave absorption outcomes results indicate that the maximum R L of Co@C@NRGO can achieve up to −73.4 dB at 12.1 GHz with an absorber thickness of 2 mm, and the absorption bandwidth (90% absorption efficiency) is as wide as 5.3 GHz (from 9.9 to 15.2 GHz) with the content of 20 wt%. The microwave absorption mechanisms reveal that the covalent bonds between Co@C and NRGO can accelerate the electron transport and facilitate the formation of a conductive network. Meanwhile, the preferable impedance matching, strong attenuation ability, multiple interfacial polarization, and well good complementarities contribute to promoting the promotion of the EM wave absorption capacity of Co@C@NRGO hybrid. Considering the outstanding performance, the as-prepared Co@C@NRGO composite held by covalent bonding can provide an inspiration for the construction of novel microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2012
·
IF 5.625
Ting Bao,Zhongkui Zhao,Yitao Dai,Xiaoli Lin,Ronghua Jin,Guiru Wang,Turghun Muhammad
CO preferential oxidation (PROX) reactions were performed over the supported Co 3 O 4 -CeO 2 catalysts on modified activated carbon (AC) for eliminating the trace CO from H 2 -rich gases. The effects of support modification by H 2 O 2 oxidation treatment , catalyst calcination temperature, Ce/Co atomic ratio ( n Ce/Co ), Co 3 O 4 -CeO 2 loading and reaction parameters on catalytic properties of the Co 3 O 4 -CeO 2 /AC catalysts were investigated. Various characterization techniques like scanning electron microscopy (SEM), X-ray diffraction (XRD) and H 2 temperature-programmed reduction (H 2 -TPR) were employed to reveal the relationship between catalysts nature and catalytic performance. Results illustrate that the supported Co 3 O 4 -CeO 2 catalyst on modified AC exhibits excellent catalytic properties, which highly depends on dispersity and reducibility of Co 3 O 4 affected by the time of support treatment ( t p ), calcination temperature, n Ce/Co and loading. The supported 35 wt% Co 3 O 4 -CeO 2 catalyst (1:8 of n Ce/Co ) on the modified AC with H 2 O 2 oxidation treatment for 6 h demonstrates the best catalytic properties and the almost complete CO transformation takes place in a wide temperature range of 125–190 °C. Moreover, it is also found that the developed catalyst exhibits an outstanding catalytic stability, and 100% CO conversion can be maintained as the time on stream evolutes up to 1800 min even in the presence of CO 2 and H 2 O in the feed. The optimized Co 3 O 4 -CeO 2 /AC may be a robust and promising catalyst for eliminating trace CO from H 2 -rich gases.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）