CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Shukai Diao,Tianwen Wang,Wen Kuang,Su Yan,Xiaotian Zhang,Mingxuan Chen,Ying Liu,Aidong Tan,Tianrang Yang,Jianguo Liu
Alkaline water electrolysis (AWE) is a leading “green hydrogen” production technology. Industrial electrodes use alkaline leaching to remove Al from NiAl alloy, creating pores and increasing specific surface area (SSA) but still suffer from poor electrode performance. This study presents a method for fabricating an efficient bifunctional electrode. The process involves creating a porous Ni layer with high SSA on nickel mesh (NM) by reducing NiO, which facilitates the formation of Ni(OH) 2 nanosheets. The resulting Ni/Ni(OH) 2 @NM electrode features a hydrophilic, gas-repellent and highly electrochemically active surface. It achieves low overpotentials for hydrogen and oxygen evolution reactions (164 mV and 337 mV at 100 mA/cm 2 , respectively). The electrolyzer using Ni/Ni(OH) 2 @NM electrodes only requires 1.695 V to achieve 300 mA/cm 2 at 80 °C after a 2000 h durability test. The electrode also demonstrates excellent stability under frequent start-stop cycles, making it well-suited for integration with intermittent renewable energy sources.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jie Wang,Guicai Lv,Cheng Wang
Hydrogen production by electrochemical overall water splitting is considered as a clean and renewable approach for greener energy. However, the efficiency of water electrolysis suffers from the sluggish kinetics and high overpotential of OER. Although NiFe LDH is regarded as a promising OER catalyst, it faces the problem of poor conductivity, resulting in the limitations of HER performance. Herein, a hybrid nano-architecture of CoNiN@NiFe LDH as a bifunctional electrocatalyst for overall water splitting is fabricated via in-situ electrochemically assembling hierarchical NiFe LDH nanosheets on the surface of CoNiN. CoNiN@NiFe LDH shows excellent activities for OER with the overpotentials of 227 and 291 mV to deliver the current densities of 10 and 100 mA cm −2 , respectively. Moreover, an alkaline electrolyzer with CoNiN@NiFe LDH as anode and cathode requires a cell voltage of 1.63 V to achieve 10 mA cm −2 . In addition, the excellent stability with 100 h towards overall water splitting outperforms most transition metal-based bifunctional electrocatalysts. The superior performance is attributed to the abundant active sites, the strong electronic interaction, and the corresponding metal (oxy)hydroxides species generated by in situ surface reconstruction and phase transformation.
研究领域:
材料科学
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电化学
·
能源转换
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 35
·16625-16640
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IF 3.553
Zhang Zewu,Zhou Jiamin,Wei Hanlin,Dai Yifan,Li Shijia,Shi Haojun,Xu Gang
Abstract Efficient design and preparation of cost-effective and binder-free bifunctional electrocatalysts to accelerate the hydrogen and oxygen evolution reaction (HER and OER) are critical for overall water splitting. In this work, 3D hierarchical NiFe-LDH/FeCoS 2 /CFC electrodes were synthesized for the first time. The carboxyl groups derived from acid treating promote the homogeneously coated FeCoS 2 on CFC, giving rise to the strongly coupled FeCoS 2 /CFC hybrid. The NiFe-LDH exhibited the vertical growth feature on the FeCoS 2 /CFC composite, which can efficiently expose the active edges sites. Due to unique structure and synergistic effect between the components, the NiFe-LDH/FeCoS 2 /CFC exhibits significant electrocatalytic activity and stability under alkaline environments, with overpotentials of 190 and 308 mV to achieve 10 mA cm −2 for OER and HER, respectively, providing it as a promising electrocatalyst for water splitting reaction. In addition, we deeply studied the synergistic catalytic mechanism of NiFe-LDH/FeCoS 2 /CFC, explaining the reasons leading to the improved catalytic performance of HER and OER. Graphic abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Pharmaceutics
·
2018
·Vol. 10
·期 3
·146
·
IF 3.746
Yifan Yang,Yunzhi Yin,Jun Zhang,Tiantian Zuo,Xiao Liang,Jing Li,Qi Shen
Oral delivery is considered the preferred route of administration due to its convenience and favorable compliance. Here, docetaxel (DTX) loaded polylactic-co-glycolic acid (PLGA) nanoparticles, coated with polyethyleneimine–folic acid (PEI-FA) and polyethyleneimine–borneol (PEI-BO), were designed to enhance oral absorption (FA/BO-PLGA-NPs). The FA/BO-PLGA-NPs were spherical and smooth with an average size of (137.0 ± 2.1) nm. Encapsulation efficiency (EE%) and drug loading (DL%) were (80.3 ± 1.8)% and (2.3 ± 0.3)%, respectively. In vitro release studies showed that approximately 62.1% of DTX was released from FA/BO-PLGA-NPs in media at pH 7.4. The reverted gut sac method showed that the absorption of FA/BO-PLGA-NPs in the intestines was approximately 6.0 times that of DTX. Moreover, cellular uptake suggested that the obtained FA/BO-PLGA-NPs could be efficiently internalized into Caco-2 cells via FA-mediated active targeting and BO-mediated P-glycoprotein (P-gp) inhibition. Pharmacokinetics study demonstrated that after oral administration of DTX at a dose of 10 mg/kg in FA/BO-PLGA-NPs, the bioavailability of FA/BO-PLGA-NPs was enhanced by approximately 6.8-fold compared with that of DTX suspension. FA/BO-PLGA-NPs caused no obvious irritation to the intestines. Overall, the FA/BO-PLGA-NP formulation remarkably improved the oral bioavailability of DTX and exhibited a promising perspective in oral drug delivery.Keywords:docetaxel;nanoparticles;dual-functional;folic acid;borneol;oral absorption
研究领域:
药学
·
纳米技术
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药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energies
·
2021
·Vol. 15
·期 1
·53
·
IF 3.004
Kai Miao,Tan Li,Jing Su,Cong Wang,Kaige Wang
Catalytic hydropyrolysis via the introduction of external hydrogen into catalytic pyrolysis process using hydrodeoxygenation catalysts is one of the major approaches of bio-oil upgrading. In this study, hydrodeoxygenation of acetone over Mo/HZSM-5 and HZSM-5 were investigated with focus on the influence of hydrogen pressure and catalyst deactivation. It is found that doped MoO3could prolong the catalyst activity due to the suppression of coke formation. The influence of hydrogen pressure on catalytic HDO of acetone was further studied. Hydrogen pressure of 30 bar effectively prolonged catalyst activity while decreased the coke deposition over catalyst. The coke formation over the HZSM-5 and Mo/HZSM-5 under 30 bar hydrogen pressure decreased 66% and 83%, respectively, compared to that under atmospheric hydrogen pressure. Compared to the test with the HZSM-5, 35% higher yield of aliphatics and 60% lower coke were obtained from the Mo/HZSM-5 under 30 bar hydrogen pressure. Characterization of the spent Mo/HZSM-5 catalyst revealed the deactivation was mainly due to the carbon deposition blocking the micropores and Bronsted acid sites. Mo/HZSM-5 was proved to be potentially enhanced production of hydrocarbons.Keywords:hydrodeoxygenation;biomass;hydropyrolysis;MoO3;bifunctional catalysts
研究领域:
化学工程
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
BioTech
·
2025
·Vol. 14
·期 1
·18
·
IF 3.1
Yao Lu,Qiang Jiang,Yamin Dong,Runzhen Ji,Yiwen Xiao,Du Zhu,Boliang Gao
The GH43 family of glycosidases represents an important class of industrial enzymes that are widely utilized across the food, pharmaceutical, and various other sectors. In this study, we identified a GH43 family glycoside hydrolytic enzyme,Xyaf313, derived from the plant endophytic fungusChaetomium globosumDX-THS3, which is capable of transforming several common ginsenosides. The enzyme function analysis reveals that Xyaf313 exhibits dual functionality, displaying both α-L-arabinofuranosidase and β-D-xylosidase activity. When acting as an α-L-arabinofuranosidase, Xyaf313 achieves optimal enzyme activity of 23.96 U/mg at a temperature of 50 °C and a pH of 7. In contrast, its β-D-xylosidase activity results in a slight reduction in enzyme activity to 23.24 U/mg, with similar optimal temperature and pH conditions to those observed for the α-L-arabinofuranosidase activity. Furthermore, Xyaf313 demonstrates considerable resistance to most metal ions and common chemical reagents. Notably, while the maximum enzyme activity of Xyaf313 occurs at 50 °C, it maintains high activity at room temperature (30 °C), with relative enzyme activity exceeding 90%. Measurements of ginsenoside transformation show that Xyaf313 can convert common ginsenosides Rc, Rb1, Rb2, and Rb3into Rd, underscoring its potential for pharmaceutical applications. Overall, our findings contribute to the identification of a new class of bifunctional GH43 glycoside hydrolases, highlight the significance of plant endophytic fungi as a promising resource for the screening of carbohydrate-decomposing enzymes, and present new candidate enzymes for the biotransformation of ginsenosides.
研究领域:
生物化学
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工业酶学
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药用植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Na Li,Feng Yi,Peng Liao,Wenling Chen,Meiyan Fu,Jun Zheng,Lin Du,Jia-liang Liu,Chong-ying Li
Analysis of complex pore structure of geomaterials is a fundamental issue in geoscience. Here bifunctional nanoparticles with magnetic and fluorescent properties are introduced as novel markers for optical imaging of pore structure in geomaterials. Using the paramagnetic property, powder of the nanoparticle is driven into pores under an external magnetic field, avoiding a tedious sample preparation and eliminating artificial damage of sample preparation in conventional methods. Meanwhile, the fluorescent nanoparticle marker offers a sharp contrast imaging between the rock matrix (black) and pores (bright) under microscopy. Furthermore, fluorescent nanoparticles with different sizes and colors are designed to demonstrate the potential of the method for describing pore throat sizes. Combining the merits of the paramagnetic and fluorescent properties of nanoparticles, a convenient and practical sample preparation is proposed to promote optical imaging analysis of the pore structure in geomaterials.
研究领域:
地质科学
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材料科学
·
光学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2021
·Vol. 17
·期 45
·2102078
·
IF 13.281
Pengsong Li,Xinxuan Duan,Yun Kuang,Xiaoming Sun
Electrocatalytic water splitting in acidic media is a promising strategy for grid scale production of hydrogen using renewable energy, but challenges still exist in the development of advanced catalysts with both high activity and stability. Herein, it is reported that iridium doped tungsten trioxide (Ir-doped WO 3 ) with arrayed structure and confined Ir sites is an efficient and durable bi-functional catalyst for overall acidic water splitting. A low overpotential (258 mV) is required to achieve an oxygen evolution reaction current density of 10 mA cm −2 in 0.5 m H 2 SO 4 solution. Meanwhile, Ir-doped WO 3 processes a similar intrinsic activity to Pt/C toward hydrogen evolution reaction. Overall water splitting using the bi-functional Ir-doped WO 3 catalyst shows low cell voltages of 1.56 and 1.68 V to drive the current densities of 10 and 100 mA cm −2 , respectively, with only 16 mV decay observed after 60 h continuous electrolysis under the current density of 100 mA cm −2 . Structural analysis and density functional theory calculation indicate that the adjusted coordination environment of Ir within the crystalline matrix of WO 3 contributes to the high activity and durability.
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
Advanced Sustainable Systems
·
2021
·Vol. 6
·期 1
·2100343
·
IF 6.271
Yinghui Li,Yuanju Qu,Chaocheng Liu,Jiedong Cui,Ke Xu,Yang Li,Haoyu Shen,Zhouguang Lu,Hui Pan,Tao Xu,Detao Liu
Bifunctional oxygen reduction/oxidation reaction (ORR/OER) electrocatalysts derived from biomass are one of the most valuable materials in terms of sustainability, ecological economy and industrial manufacturing, and are emerging as a desired alternative to the commercial Pt/C and IrO 2 catalysts. This work demonstrates the processing of agricultural cornstalk waste of cornstalks into stable bifunctional ORR/OER catalysts with high-performance by a simple and cost-effective strategy. Rich hydrophilic active groups (e.g., hydroxyl groups) in the hierarchical porous structures of the native cornstalks enable the sufficient facile combination with transition metals (e.g., Co, Fe, Zn) and heteroatoms (e.g., B, N) from soluble Co(NO 3 ) 2 , ZnCl 2 , H 3 BO 3 , NH 4 Cl in a hydrothermal reaction. The pyrolytic evaporation of Zn 2+ in a high-temperature carbonization process facilitates the generation of abundant micropores and mesopores to increase specific surface areas (941.44 m 2 g −1 ) and also hinders aggregation between neighboring transition metals. The synergistic effects of N, B, Fe and Co doping in hierarchical porous biochar-structures contributes to outstanding bifunctional ORR/OER activities and working stabilities, outperforming commercial Pt/C and IrO 2 catalysts. Computational results further verify the valuable synergistic contributions based on density-functional theory (DFT). This approach opens up a new possibility for the fabrication of bifunctional biochar-based ORR/OER catalysts from artificial engineering and green processing for sustainable agricultural wastes.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zhihui Ma,Haitao Wang,Hanyu Ma,Sihui Zhan,Qixing Zhou
The electrochemical urea oxidation (UOR) involves the generation of gases bubbles, which often cause the blockage of the electrode surface leading to decline activity. Herein, we report the growth of Ni 5 P 4 nanosheets on nickel foam as bifunctional electrode (CA-Ni 5 P 4 @NiO x /NF) for urea electrolysis. The results indicated that a thin layer of amorphous NiOx formed on the surface of Ni 5 P 4 nanosheets to yield a unique crystalline@amorphous core–shell structure, which can be maintained during long time urea electrolysis. The outstanding UOR performance of CA-Ni 5 P 4 @NiO x /NF was attributed to the unique structure, which not only combine the good conductivity and abundant active sites, but also rendered the CA-Ni 5 P 4 @NiO x /NF superhydrophilic and aerophobic that significantly facilities the release of gases bubbles formed during UOR to avoid the blockage of the active sites. As a result, the CA-Ni 5 P 4 @NiO x /NF electrode exhibited excellent performance for UOR, which only needs 1.45 V (vs. RHE) to deliver a current of 100 mA/cm 2 . When used as anode for direct urea fuel cell (DUFC), it could reach a maximal power density as high as 3.4 mW/cm 2 with an OCV of 0.76 V. The CA-Ni 5 P 4 @NiO x /NF also exhibited excellent activity for hydrogen evolution reaction (HER), with -0.089 V (vs. RHE) to deliver a current of 10 mA/cm 2 . The electrolyzer constructed with CA-Ni 5 P 4 @NiO x as both anode and cathode could run for more than 10 h at a high current load about 100 mA/cm 2 without appreciable potential change, indicating the superb stability of the CA-Ni 5 P 4 @NiO x electrode. Our work provides new insights for understanding as well as the development of advanced electrode for DUFC and urea electrolysis.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yaqiong Gong,Yu Lin,Zhi Yang,Feixiang Jiao,Jinhui Li,Wenfei Wang
The investigation of earth-abundant, durable, and efficient bifunctional electrocatalysts for overall water splitting was critical to future renewable energy systems. Herein, flower-like Mn-doped Cu 7.2 S 4 @NiS 2 @NiS was successfully assembled on 3D nickel foam (NF) substrate via a facile two-step hydrothermal‑sulfuration method (denote as flower-like Mn 2 -CNN/NF). Benefited from unique 3D configuration with firm contact between nanoflowers and Ni foam, flower-like Mn 2 -CNN/NF electrode demonstrated a low overpotential of 252 mV to achieve a current density of 50 mA cm −2 and 24 h-long stability toward oxygen evolution reaction (OER) in 1 M KOH. For hydrogen evolution reaction (HER), a stable current density of 10 mA cm −2 at only an overpotential of 87 mV and a low Tafel slope of 43.7 mV dec −1 were observed. Furthermore, when assembled as electrolyzers on both cathode and anode for stable water splitting, a low cell voltage of 1.514 V was needed for flower-like Mn 2 -CNN/NF to afford the current density of 10 mA cm −2 and distinguished durability for over 46 h was observed, which presented a wide range of possibilities for the development of earth-abundant and high efficient electrode pairs.
研究领域:
材料科学
·
可再生能源
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yihao Liu,Kun Wang,Xiaohui Peng,Chen Wang,Weiwei Fang,Yusong Zhu,Yuhui Chen,Lili Liu,Yuping Wu
To realize the utilization of high-performance lithium–oxygen batteries (LOBs), a rational-designed cathode structure and efficient catalytic materials are necessary. However, side products accumulated during battery cycling seriously affects the performance. Designing a cathode catalyst that could simultaneously facilitate the catalytic efficiency of the main reaction and inhibit the side reactions will make great sense. Herein, NiCeOx was proposed for the first time as a bifunctional cathode catalyst material for LOBs. The combined action of NiO and CeO2 components was expected to facilitate the decomposition of byproducts (e.g., Li2CO3), increase the oxygen vacancy content in CeO2, and enhance the adsorption of oxygen and superoxide. NiCeOx nanorods (NiCeOx PNR) were prepared using electrospinning method. It showed a hollow and porous nanorod (PNR)-like structure, which provided a large number of catalytic active sites and facilitated the transport of reactants and the deposition of discharge products. As a result, a high specific discharge capacity (2175.9 mAh g–1) and a long lifespan (67 cycles at 100 mA g–1 with a limited capacity of 500 mAh g–1) were obtained.
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
危险品化学品经营许可证（带存储）