Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 5
·1-10
·
IF 4.3
Li Kaile,Yu Shijie,Li Qinghai,Zhang Yanguo,Zhou Hui
Lignin, an abundant aromatic polymer in nature, has received significant attention for its potential in the production of bio-oils and chemicals owing to increased resource availability and environmental issues. The hydrodeoxygenation of guaiacol, a lignin-derived monomer, can produce cyclohexanol, a nylon precursor, in a carbon-negative and environmentally friendly manner. This study explored the porous properties and the effects of activation methods on the Ru-based catalyst supported by environmentally friendly and cost-effective hydrochar. Highly selective cleavage of C aryl -O bonds was achieved under mild conditions (160 °C, 0.2 MPa H 2 , and 4 h), and alkali activation further improved the catalytic activity. Various characterization methods revealed that hydrothermal treatment and alkali activation relatively contributed to the excellent performance of the catalysts and influenced their porous structure and Ru dispersion. X-ray photoelectron spectroscopy results revealed an increased formation of metallic ruthenium, indicating the effective regulation of interaction between active sites and supports. This synergistic approach used in this study, involving the valorization of cellulose-derived hydrochar and the selective production of nylon precursors from lignin-derived guaiacol, indicated the comprehensive and sustainable utilization of biomass resources.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mengshu Li,Ziquan Zeng,Weicai Liu,Hui Zong,Bo Li,Shijing Gong,Ke Yu,Ziqiang Zhu
In space, electrolysis of water is one of the main methods to generate oxygen (for life support), and its harsh environment places higher demands on the oxygen evolution reaction (OER). Cobalt-based carbonate hydroxides (CCH) have emerged as new candidates for OER catalysts in recent years. However, disadvantages such as poor catalytic activity and easy agglomeration of pristine CCH hinder its application in catalysis. Herein, we synthesized ZnCoCH@Ti 3 C 2 T x heterostructure with a unique structure of grass-like Zn-doped bimetallic carbonate hydroxides grown in situ on MXene by a solvothermal method. The ZnCoCH@Ti 3 C 2 T x electrocatalyst in 1 M KOH shows a low overpotential (280 mV) at 10 mA cm −2 , a small Tafel slope (46.2 mV dec -1 ) and a Faraday efficiency of nearly 100 %. The experimental and DFT calculations show that MXene plays a dual enhancing role as a conductive carrier and a reducing agent in improving the OER performance. As a conductive carrier, MXene alleviates the agglomeration of ZnCoCH and enhances the conductivity and charge transfer ability of the heterostructure. As a reducing agent, MXene provides more redox sites by reducing ZnCoCH and promotes the adsorption of intermediate species on the catalyst. Zn is not only an economical and eco-friendly metal but also may have anti-toxicity. This study provides a reasonable idea for the design of efficient, economical, green and poison-resistant OER catalysts for electrolytic water.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Ce Qiu,Jing Jiang,Lunhong Ai
Developing robust earth-abundant electrocatalysts for oxygen evolution reaction (OER) is an ongoing scientific challenge, which is coupled with a number of important electrochemical processes and many key renewable energy systems, such as water splitting, rechargeable metal–air batteries, and regenerative fuel cells. Here, we proposed a rational design and fabrication of the synergetic coaxial nanocable structures by intimate growth of the layered nickel–cobalt silicate hydroxide nanosheets on the outer surfaces of multiwalled carbon nanotubes (MWCNTs@NCS) and demonstrated their high efficiency in electrocatalytic OER from water splitting. The electrocatalytic activities of the MWCNTs@NCS were found to be significantly higher than that of bare NCS and pristine MWCNTs, synergetically determining by such the constituted individual components. Among them, the MWCNTs@NCS-2 exhibited best electrocatalytic OER performance, showing a small OER onset potential, large anodic current and long-term durability, which was favorably comparable to the previously reported NiCo-based OER electrocatalysts in alkaline electrolytes. To the best of our knowledge, this was a first example on the earth-abundant metal silicate hydroxides utilized in electrochemical water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Minglei Yan,Junjie Zhang,Cong Wang,Lang Gao,Wengang Liu,Jiahao Zhang,Chunquan Liu,Zhiwei Lu,Lijun Yang,Chenglu Jiang,Yang Zhao
Designing inexpensive, high-efficiency and durable bifunctional catalysts for urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) is an encouraging tactic to produce hydrogen with reduced energy expenditure. Herein, oxygen vacancy-rich cobalt hydroxide/aluminum oxyhydroxide heterostructure on nickel foam (denoted as Co(OH) 2 /AlOOH/NF-100) has been fabricated using one step hydrothermal process. Theoretical calculation and experimental results indicate the electrons transfer from Co(OH) 2 to highly active AlOOH results in the interfacial charge redistribution and optimization of electronic structure. Abundant oxygen vacancies in the heterostructure could improve the conductivity and simultaneously serve as the active sites for catalytic reaction. Consequently, the optimal Co(OH) 2 /AlOOH/NF-100 demonstrates excellent electrocatalytic performance for HER (62.9 mV@10 mA cm -2 ) and UOR (1.36 V@10 mA cm -2 ) due to the synergy between heterointerface and oxygen vacancies. Additionally, the in situ electrochemical impedance spectrum (EIS) for UOR suggests that the heterostructured catalyst exhibits rapid reaction kinetics, mass transfer and current response. Importantly, the urea-assisted electrolysis composed of the Co(OH) 2 /AlOOH/NF-100 manifests a low cell voltage (1.48 V @ 10 mA cm -2 ) in 1 M KOH containing 0.5 M urea. This work presents a promising avenue to the development of HER/UOR bifunctional electrocatalysts.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Chunlei Yang,Guiju Xu,Chenghao Hou,Hongwei Zhang
Gallic acid (GA) is widely used in beverages, food, and other fields as antioxidant. However, GA is slightly toxic and the accumulation of GA is harmful to human body. Therefore, it's vital to develop simple and sensitive detection methods for GA. In this work, a novel ratiometric fluorescent nanoprobe (named CoOOH/OPD/SiNPs) for the GA detection in different foods was designed and prepared. The fluorescence of silicon nanoparticles (SiNPs) at 443 nm would be quenched by cobalt oxyhydroxide (CoOOH) nanoflakes. o -phenylenediamine (OPD) would be oxidized to 2,3-diaminophenazine (DAP) by CoOOH nanoflakes that have peroxidase-like activity, which produces a new fluorescent peak at 556 nm. Meanwhile, SiNPs' fluorescence would be quenched through DAP due to inner filter effect (IFE). With the addition of GA, the reductive decomposition of CoOOH decreased DAP level, causing IFE being restrained. The concentration of GA indicates an excellent linear relationship with fluorescence ratio (F 443 /F 556 ) in range of 0.4–12 μM (R 2 = 0.9937) with 0.16 μM detection limit. This nanoprobe is applied to GA detection in water, tea leaves, fruits and nut fruits, which would be expected to act as a portable device for complex substances analysis.
研究领域:
分析化学
·
食品科学
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生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 42
·20490-20496
·
IF 3.925
Ling Li,Jing Wu,Lieyuan Huang,Gaoli Lan,Naxiang Wang,Hui Zhang,Xin Chen,Xingbo Ge
Commercial applications of electrolytic water splitting require cost-efficient and active oxygen evolution catalysts. Nickel–iron (NiFe)-based compounds have attracted significant attention as oxygen evolution reaction (OER) catalysts due to their high catalytic activity. We develop a simple and easily controlled method by combining anodic fluoridation and cyclic voltammetry (CV) treatment to convert NiFe alloy to Ni/Fe hydroxide. A cracked layer structure of Ni/Fe hydroxide formed on the surface during the fluoridation of NiFe alloy and the CV process in KOH. The Ni/Fe hydroxide exhibits considerable OER activity with an onset potential of 1.47 V vs. RHE and a Tafel slope of 47 mV dec−1 in 0.1 M KOH. The electrode also shows an acceptable stability in alkaline media. The results indicate that anodic fluoridation and CV treatment are promising methods to form active layer structures of hydroxide on transition metals and their alloys, further increasing the electrocatalytic activity of the catalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Wenhao Zhang,Yuanhao Tang,Liangmin Yu,Xin-Yao Yu
Nickel-based metal oxides/hydroxides are promising electrocatalysts for oxygen evolution reaction. However, their electrocatalytic activity for hydrogen evolution reaction (HER) is very poor. Herein, taking Mo-incorporated nickel hydroxide (Mo-Ni(OH) 2 ) as an example, a facile, time-efficient, and low-temperature H 2 /N 2 plasma activation strategy is developed to activate the HER performance by constructing heterostructure. This kind of heterostructure is composed of metal, metal alloy, metal nitride , and oxygen vacancy-riched metal hydroxide with more exposed catalytically active sites, enhanced mass activity, and accelerated electron transport. The optimized plasma-activated Mo-Ni(OH) 2 (P-Mo-Ni(OH) 2 ) manifests superior HER performance to pristine Mo-Ni(OH) 2 and even comparable to the benchmark Pt/C catalyst in alkaline solution. Moreover, when assembling a two-electrode urea-assisted water electrolysis system by using P-Mo-Ni(OH) 2 as both cathode and anode, the assembled cell only need a small voltage of 1.36 V to achieve a current density of 10 mA cm −2 and exhibits extremely stable catalytic performance up to 1000 h.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 10
·2416-2425
·
IF 6.569
Heng Zhai,Pengfei Xu,Yueqi Li,Ping Ye,Ruihao Wang,Changping Guo,Guangcheng Yang
At present, the preparation of propellants with high safety and good thermal decomposition performance is still a challenge. An ammonium perchlorate/cobalt acetate hydroxide (AP/Co3(CH3COO)5(OH)) composite was synthesized in situ via liquid deposition. Owing to the barrier effect and heat absorption of cobalt acetate hydroxide, the resulting composite offers reductions in the impact sensitivity and friction sensitivity by 10.2 cm and 96%, respectively. Moreover, with the increase in temperature, cobalt acetate hydroxide coated on the AP surface in situ decomposed into monodisperse CoO nanoparticles around 223 °C, which reduced the high temperature decomposition of ammonium perchlorate from 426.8 °C to 332.8 °C. The real-time FT-IR spectra showed that CoO mainly accelerates the oxidation of ammonia and the conversion of N2O to NO by promoting electron transfer, thereby catalyzing the thermal decomposition of AP. These confirmed that preparing the AP/Co3(CH3COO)5(OH) composite will lay a foundation for the development of novel high safety performance and high burning rate AP-based solid propellants, showing a broad application prospect.
研究领域:
材料科学
·
推进剂研究
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Meng Chen,Yifu Zhang,Yanyan Liu,Qiushi Wang,Jiqi Zheng,Changgong Meng
It is always worthwhile to develop novel composite electrode materials for supercapacitors, especially the combination of stable conductive structures and metal oxides with high electrochemical performance. Compared with vanadium oxides, vanadium oxyhydroxide has been paid rare attention as energy storage materials. Herein, a 3D hierarchical VOx(OH)y/carbon nanotube (CNT)/reduced graphene oxide (rGO) composite is synthesized by a facile self-assembly method. CNT/rGO networks act as structure-directing agent and provide excellent conductivity. VOx(OH)y anchored to CNT/rGO networks is a novel vanadium oxyhydroxide with a mixed-valence V+4/+5, composed of major V3O5(OH)4 and minor V2O5·H2O. The VOx(OH)y/CNT/rGO composite electrode exhibits a high specific capacitance of 414 F·g–1 at 0.5 A·g–1 within the potential range of −1.2 to +0.6 V in 1 mol·L–1 LiClO4/PC. The symmetrical supercapacitor can deliver a high energy density of 60.90 Wh·kg–1 at a power density of 81.85 W·kg–1 with a large voltage window of 2.2 V. The preeminent electrochemical properties are because of the synergistic effects from VOx(OH)y nanowires and conductive CNT/rGO networks. The impressive results illustrate that a symmetric supercapacitor is expected and promising for energy storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
CARBON
·
2019
·
IF 7.466
Hao Zhang,Qiuying Chang
Herein, a hydrothermal amorphous carbon-coated nano-magnesium silicate hydroxide core-shell structure (MSH@C) was synthesized in subcritical water. The structure, phase and chemical composition of nanocomposite powders were characterized by Scanning electron microscope , Transmission electron Microscope, X-ray diffractometer, X-ray photoelectron spectrometer and Raman spectrometer. The tribological tests of nanoparticles as lubricant additives were carried out in order to study the effect of friction on the phase transition and structural ordering of the hydrothermal amorphous carbon in nanocomposite powders. The results show that nano-MSH@C nanoparticles exhibit excellent friction reduction and anti-wear performances. EDS and Raman analyses show that a discontinuous sp 2 -rich tribofilm is formed on the worn surface. The tribofilm formed on the worn surface not only undergoes the phase transformation from sp 3 to sp 2 but also has a higher structural order. The degree of friction-induced rehybridization is proportional to the wear resistance of nanoparticles. The pathway of friction-induced rehybridization and the enhancement of the structural order of the hydrothermal amorphous carbon are attributed to the friction-induced dehydrogenation reaction and the adaptively sliding oriented rearrangement. The tribological mechanism of MSH@C as lubricant additive is mainly ascribed to the shear-induced transfer of the friction-induced loose tribofilm.
研究领域:
材料科学
·
摩擦学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）