FUEL
·
2021
·
IF 6.609
Mingxing Zhao,Jun Hu,Shiliang Wu,Liu Yang,Xue An,Peng Yuan,Ping Lu
Cyclohexanols, promising oxygenated fuel additives and value-added chemicals, can be obtained by hydrodeoxygenation (HDO) of lignin-derived phenolics. Here, an N-doped bimetallic RuCoN x /NC catalyst was facilely prepared for HDO by direct pyrolysis of chitin impregnated with precursors of Ru and Co. Characterization of RuCoN x /NC with N 2 sorption, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and NH 3 temperature-programmed desorption (NH 3 -TPD) reveal that the metallic particles of electron-deficient Ru species and electron-enriched Co species were uniformly anchored on the micro-mesoporous N-doped carbon matrix with high dispersion and nano-scale size. The abundant accessible active sites and continuous spillover of H from Ru to Co make RuCoN x /NC an excellent HDO catalyst. 4-Propylguaiacol, a typical phenolic compound from lignin degradation, was hydrodeoxygenated into 92% 4-propylcyclohexanol over RuCoN x /NC at 210 ℃. With temperature increasing, propylcyclohexane became the major product, possessing 95% selectivity at 280 °C after 6 h. Reusability tests show that RuCoN x /NC can be recycled four times without the loss of conversion and initial selectivity. HDO of other phenolic compounds confirms the general applicability of RuCoN x /NC.
研究领域:
催化
·
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Cong Geng,Peng Wei,Huamei Chen,Haichao Liu,Shenshen Zheng,Haobin Wang,Yahong Xie
Carbon-based perovskite solar cells (C-PSCs) facilitate modularization and commercialization due to their excellent thermal stability and low cost. However, C-PSCs show the poor performance that charge carrier extraction by the carbon electrode alone is not as efficient as in the case of conventional hole transport materials (HTMs) based PSCs. In this work, an inorganic hole buffer layer of nitrogen-doped carbon/Co 3 O 4 (Co 3 O 4 @NC) nanoparticles derived from MOFs is introduced to adjust energy alignment and passivate perovskite (PSK) grain boundaries (GBs). Moreover, a simple processing method on the Co 3 O 4 @NC nanoparticles manipulated by controllable ultraviolet/ozone (UVO) treatment is employed, to further improve the interfacial performance of MAPbI 3 /Co 3 O 4 @NC and reduce the hysteresis. Through interface engineering, it is found that Co 3 O 4 @NC inorganic hole buffer layer effectively promotes photo‐generated charge separation and extraction, and suppresses charge recombination at the MAPbI 3 /Carbon electrode (CE) interface, resulting in improved photovoltaic performance. Consequently, the optimal C-PSCs without encapsulation achieved a maximum PCE of 14.63%, which is 22.3% more efficient than the pristine device (11.96%), and exhibited outstanding long-term stability.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Xiaoqing Gao,Shanhui Zhu,Mei Dong,Hongyan Zheng,Yanfeng Xue,Xiaojing Cui,Yulan Niu,Weibin Fan
Highly efficient synthesis of valuable γ-valerolactone (GVL) by levulinic acid (LA) hydrogenation is of interest for biomass refinery, but it suffers from great challenge to design highly active Ru-based catalyst at low temperature. ZIF-8 derived ZnO@NC nanocomposite can firmly anchor Ru nanoparticles to create strong Ru-ZnO interfacial structure, as revealed by characterization techniques and DFT calculations. By optimizing Ru content and ZnO particle size, Ru/ZnO@NC achieved excellent reaction activity with a turnover frequency (TOF) of 6032 h −1 at low temperature of 40 °C, which is never reported before. After etching the accessible ZnO, the TOF value was significantly declined to 125 h −1 on Ru/ZnO@NC-HF owing to the lack of effective Ru-ZnO interface. DFT calculation results demonstrate that the Ru-ZnO interfacial structure can facilitate the activation of intermediate CH 3 CHOCH 2 CH 2 COOH* and remarkably decline the activation energy barrier of rate-determining step (CH 3 CHOCH 2 CH 2 COOH + H = HPA) from 1.28 eV to 0.82 eV, thus leading to excellent activity of LA hydrogenation at low temperature.
研究领域:
催化化学
·
生物质能
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yu Zhou,Yuying Duan,Yancen Liu,Yongjuan Geng,Zuquan Jin,Liangmin Yu,Shaochun Li
To address the challenges of impedance mismatch and corrosion in electromagnetic wave absorption materials, this work synthesized NiSe 2 /NC/Ti 3 C 2 T x MXene composites by integrating the advantages of modified Ti 3 C 2 T x MXene and MOF-derived materials. The precursors for the Ni-MOF and MXene were prepared using a combination of multiple etching and microwave methods, followed by in-situ selenization pyrolysis under an argon atmosphere. By tuning the MXene content, the morphology, specific surface area, porous structure, and electromagnetic properties of the composites were precisely controlled. Under optimal conditions (pyrolysis temperature of 600 °C), the composite achieved a minimum reflection loss of −58.46 dB at 5.68 GHz with a thickness of 1.5 mm, within the 2–18 GHz frequency range. This outstanding performance is attributed to the synergistic effects of conduction loss, dipole and interface polarization, magnetic resonance, multiple electromagnetic reflections and scattering, and well-balanced impedance matching. Additionally, the composite exhibits excellent corrosion resistance, making it highly suitable for complex and challenging service environments. This work presents a novel strategy for developing materials with dual functions of superior electromagnetic wave absorption and corrosion resistance.
研究领域:
材料科学
·
电磁学
·
腐蚀科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Jiajia Li,Guoliang Lai,Ling Li,Wenming Zhang
The rational design of low-cost, efficient, and durable bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical for advancing next-generation energy storage systems. Here, a dodecahedral zeolitic imidazolate framework-67 (ZIF-67) is employed as a structural template to direct the formation of cobalt-tipped nitrogen-doped carbon nanotube arrays (Co@NC@NCNT). This hierarchical architecture integrates high electrical conductivity with abundant accessible active sites. By optimizing the calcination temperature and melamine content, the resulting Co@NC@NCNT-750-10 catalyst achieves a high ORR half-wave potential of 0.821 V and a low OER overpotential of 370 mV. When applied in rechargeable Zn-air batteries (RZABs), it delivers a peak power density of 136.4 mW cm −2 and a specific capacity of 722.9 mAh g⁻¹, outperforming commercial Pt/C and RuO 2 benchmarks. The assembled RZAB exhibits excellent cycling stability and energy efficiency, underscoring the promise of this catalyst system for practical implementation in high-performance, metal-air energy storage technologies.
研究领域:
储能技术
·
电催化
·
纳米材料
·
金属-空气电池
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Kang Hua,Zhiyan Rui,Tianren Zhang,Yinliang Cao,Xinlong Shen,Shengping Wang,Ping He,Jia Li,Jianguo Liu
Lack of catalytic performance, short life, and high cost are three main problems related to JM-Pt/C catalysts for proton exchange membrane fuel cells. The introduction of cheap transition metals improves catalytic performance while significantly reducing the cost of the catalysts. Here, we report the synthesis of Pt 3 Co/NC alloy catalysts via coating and pyrolysis treatment . The agglomeration of nanoparticles during the high-temperature alloying process is significantly inhibited by coating with PANI . Remarkably, the obtained Pt 3 Co/NC alloy catalysts exhibit excellent ORR catalytic performance and structural stability in 0.1 mol/L HClO 4 . After 30,000 potential cycles, the mass activity and area-specific activity of Pt 3 Co/NC alloy catalysts are 1.949 and 3.936 times higher, respectively, than that of JM-Pt/C with negligible performance loss. The strong metal-support interaction between N and Pt and the Pt-rich surface restrict the dissolution of Pt and Co, resulting in excellent stability. This synthesis approach provides an effective way to develop active and stable Pt alloy catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2022
·
IF 8.321
Jian-Lei Qi,Qin-Qin Xu,Dan Zhou,Jian-Zhong Yin
Supported single-atom catalytic materials (SACMs) have aroused extensive interest due to their remarkable properties. Herein, a novel method was proffered to prepare Co-NC SACMs using custom-designed N-doped carbon (NC) as support, CoCl 2 as the precursor in supercritical CO 2 with appropriate co-solvent. It was found that when ethanol was used as co-solvent, nanoparticles were obtained while only Co single-atom was obtained when N, N-Dimethylformamide (DMF) was used as co-solvent. Both the theoretical loading and the deposition time influenced the Co loading a lot, and the maximum Co loading was as high as 1.71 wt%. Strong acid, strong alkali, corrosive solvent, and high-temperature treatment were avoided in the whole process. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM), X-ray photoelectron spectroscopy (XPS), Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), and Energy Dispersive X-ray spectroscopy (EDX) were conducted to confirm the existence and uniform distribution of Co atoms over the N-doped carbon materials. The conversion rate of 90.0% and selectivity of 86.0% were obtained for the solvent-free selective oxidation of benzyl alcohol to benzaldehyde at 70 °C and 1 h using the Co-NC SACMs.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
npj Clean Water
·
2023
·Vol. 6
·期 1
·1-11
·
IF 11.4
Li Chao,Li Jiale,Huang Niu,Kong Xin Ying,Xiao Qingyi,Huang Yingping,Wong Po Keung,Ye Liqun
Advanced oxidation technology based on peroxonosulfate (PMS) has attracted extensive attention in water treatment research due to its fast reaction speed and wide pH range adaptability. Cobalt-based catalysts are considered to be one of the most effective reagents for PMS activation in various PMS activation methods. However, Co-ion leaching and difficulty in recovery have greatly hindered its practical applications. Herein, we developed a robust membrane constructed by nitrogen-doped carbon nanotubes embedded with cobalt nanoparticles (Co-NC) to concurrently address the Co-ion leaching and recovery issues. Based on our customization, continuous water flow reactor, the Co-NC membrane exhibited excellent catalytic activity and stability, in which it demonstrated a remarkable sterilization efficiency of 99.9999% against E. coli , and it retained a superior stability of 96.29% after 40 repeated cycles. Fewer attempts to put such efficient heterogeneous advanced oxidation processes (AOPs) into practical application, to mimic real-life applications, the performance of the Co-NC/PMS system was extended to the water taken from Qiuxi River. Remarkably, there is no deterioration in performance over 12 h of continuous real sewage processing. Mechanistic studies revealed that abundant high-valence metals (Co IV =O) were generated in the system, which can attack and penetrate into the cell membrane to destroy its intracellular defense system. This work provides useful insights into designing robust membranes with superior efficiency and stability for PMS-based advanced oxidation technology.
研究领域:
环境科学
·
水处理技术
·
材料科学
·
催化
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Peng Zhang,Lele Bai,Yao Wang,Zhichao Sun,Ying-Ya Liu,Anjie Wang
Catalytic transfer hydrogenation is an effective means of producing allylic alcohols from α,β-unsaturated carbonyl compounds with extremely high selectivity. A composite catalyst bearing Lewis acid and base sites was prepared from Al(NO3)3 and dopamine hydrochloride in a one-pot synthesis followed by thermal treatment in nitrogen. The resultant catalyst exhibited remarkably high performance in transfer hydrogenation of cinnamaldehyde (CAL) to selectively produce cinnamyl alcohol (COL) using isopropanol as both hydrogen donor and solvent. A CAL conversion of 99.0% with COL selectivity of 98.9% was achieved under optimal conditions. This indicates that the nitrogen functional groups on N-doped carbon (NC), particularly pyrrolic-N and graphitic-N, significantly enhanced the catalytic efficiency of Al2O3. The enhancement of pyrrolic-N and graphitic-N in the vicinity of Al2O3 might be attributed to their concerted function in helping to deprotonate isopropanol. Based on the catalyst poisoning results, a catalytic mechanism with Lewis acid–base pairs was tentatively proposed. In addition, the composite catalyst exhibited high performances in the transfer hydrogenation of other α,β-unsaturated carbonyl compounds, including furfural, benzaldehyde, cyclohexanone, and syringaldehyde, to selectively produce the corresponding allylic alcohols.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Yaxiong Tian,Gongshu Wang,Lin Zhu,Huaxia Chen,Ting Sun
The morphology and structural engineering of V 2 O 3 anode of lithium-ion batteries plays a significant role in improving the energy storage performance since V 2 O 3 material suffers from tremendous volume changes, self-aggregation and intrinsic poor conductivity. In this work, we devise a novel 3D self-supporting N, C doped-V 2 O 3 (NC@V 2 O 3 ) composite, which consist of nanoparticles by adding urea to obtain 3D flower-like V 2 O 3 microspheres precursor during the annealing process. The V 2 O 3 microspheres self-assembled with nanosheets is fabricated by one-step solvothermal route. A possible morphological evolution mechanism of fabrication of granular NC@V 2 O 3 is explored by SEM and TEM. As anode in Li + batteries, NC@V 2 O 3 material exhibits outstanding rate performance of 227 mAh g −1 at the current density of 2 A g −1 and a reversible capacity of 272 mAh g −1 at 0.1 A g −1 after 200 cycles. Such great performance is attributed to granulated NC@V 2 O 3 architecture, which increasing the contact area of electrode-electrolyte and shortening Li + diffusion pathway. In addition, the doped N and C atoms can create more defects, providing electrochemical active sites and electronic conduction. The achievements of this study may provide new insight into design novel architecture of V 2 O 3 anode.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yonghong Wang,Kaixin Wang,Xinru Zhang,Jinping Li
Carbon molecular sieve (CMS) membranes are widely used for the separation of similar molecular kinetic diameter gas. However, their performance is limited by a large amount of discontinuous porous structures and a few adsorption affinity sites. Herein, we first prepared magnetic Co@NC@ZIF-8 nanoparticles , followed by introducing it into the polyimides matrix to design precursor membrane with vertical nanochain-like particle distribution by magnetic field induction. Afterwards, hybrid carbon molecular sieve (HCMS) membranes were prepared by pyrolyzing precursor with high-temperature under N 2 atmosphere, which had ordered microporous architecture and Co-N-C structure. Resultant HCMS membranes prepared by magnetic field induction had excellent gas separation performance, whose CO 2 , N 2 and CH 4 permeabilities were 27,050, 2614 and 622 Barrer, with CO 2 /N 2 , CO 2 /CH 4 and N 2 /CH 4 selectivities of 10.4, 43.5 and 4.2 respectively. These values far exceeded 2019 CO 2 /CH 4 and 2008 N 2 /CH 4 upper bounds as well as approached 2008 CO 2 /N 2 upper bound. The superior performance resulted from the vertically ordered nanochain-like channels for gas transport, which dramatically shortens the transport path of gas molecules to intensify shape sieving potential. Moreover, the Co-N-C structure on the wall of channels could facilitate CO 2 transport due to the π complexation. Additionally, a large quantity of nitrogen sites in the carbonized Co@NC@ZIF-8 enhance CO 2 adsorption selectivity owing to the acid-base interaction. More remarkably, after 30-day aging testing, it was found that HCMS membranes prepared by magnetic field induction had exceptional aging resistance compared to the pristine CMS membranes and one without magnetic field induction under the same aging environments.
研究领域:
材料科学
·
化学工程
·
膜技术
·
气体分离
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Minghui Xiang,Yueying Wang,Xinlei Ren,Zhiyuan Yang,Yujing Huang,Shiting Zhu,Long Chen,Jin Zhang,Hui Li
Tetrabromobisphenol A (TBBPA), a brominated flame retardant with environmental hazards poses challenges for degradation into less dangerous small molecule compounds using conventional single reduction or oxidation methods. In this study, N-doped Fe/Fe 3 C@NC was prepared as an efficient catalyst for TBBPA degradation in a sequential reduction–oxidation system (SROS). Nitrogen-doped carbon as support decelerated the oxidation of Fe 0 and simultaneously accelerated electron transfer within the composites. After the reduction reaction, the Fe species in Fe/Fe 3 C@NC were converted to Fe 2+ , which activated peroxymonosulfate more efficiently. Thus, the degradation rate constant ( k obs ) of TBBPA reached 0.132 min −1 , significantly higher than that of a single oxidation system (0.0464 min −1 ). In addition, the SROS generated more reactive oxygen species, especially O 2 •- and 1 O 2 , which facilitated electron transport and consequently led to the rapid degradation of TBBPA. Degradation pathways of TBBPA in a SROS were initially proposed, with TBBPA being debrominated gradually during reduction and then directly oxidized by cleaving the central carbon. TBBPA mineralization percentage in the SROS reached 86 %, which was the result of the reduction initially increased the oxidizability of the pollutant and ring-opening susceptibility. Predicting the toxicity of the intermediates revealed that the intermediate products generated by the SROS during the TBBPA degradation had lower toxicity. This study provides insights into the efficient mineralization of organic pollutants for the remediation of aquatic environments.
研究领域:
环境科学
·
催化化学
✓ 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）