DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
M. Thangarasu,P. Priyanka,K.L. Meghanathan,M. Parthibavarman,Sucheta Gaikwad,S. Vadivel,S. Rathinavel,D.R.P. Rajarathnam,Nouf H. Alotaibi,Saikh Mohammad
The issue of inadequate conductivity of electrons is consistently linked to the electrode material for pseudocapacitor , which hinders the complete utilization of the active material. In order to address this issue effectively, we have developed a composite material consisting of carbon nanotubes (CNTs) that are extremely conductive and wrapped around pseudocapacitive Co(OH) 2 nanobricks. The supercapacitor is created in our laboratory using a modified hydrothermal method (MHT) that allows for in situ growth. An electrochemical study confirms that the Co(OH) 2 @MWCNT electrode is extremely reactive, resulting in a maximum specific capacitance of 1911 Fg −1 (at 1 Ag −1 ). Furthermore, after 10,000 cycles of execution, it displays remarkable stability over the long term, with 96.5 % retention at a constant current density of 1 Ag −1 . In addition, the ASC has a significant energy density of 89.3 Whkg −1 at 1 Ag −1 . Furthermore, the device maintains an excellent energy density of 55.5 Whkg −1 while operating at a power density of 1015 Wkg −1 . In addition, the Co(OH) 2 @CNT//AC ASC has remarkable long-term cycling stability, with a just 4 % decrease in capacitance after 10,000 cycles. Furthermore, the device continues to maintain a commendable Coulombic efficiency of 83.5 %. These promising results indicate that these materials have the potential to be used in economical and reliable energy storage technologies .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Yujie Zhang,Changjian Wang,Jun Liang,Mengmeng Wang,Yingjuan Fu,Yongchao Zhang,Guoyu Tian,Zhaojiang Wang
This study explored the synthesis of lignin-polyol (LP) by liquefaction of Kraft lignin in polyethylene glycol and glycerol. LP23 (23 wt% lignin) and LP41 (41 wt% lignin) were obtained with remarkable liquefaction yields of 97.43 % and 93.75 %, respectively. LP-based polyurethane film (LP-PUF) was then fabricated by reacting LP23 and LP41 with hexamethylene diisocyanate. Mechanical properties and hydrophobicity of LP-PUF were optimized by varying NCO/OH molar ratios. LP23-PUF1.9 with NCO/OH of 1.9 showed excellent tensile strength of 34.28 MPa and Young's modulus of 233.27 MPa, while LP41-PUF2.0 with NCO/OH of 2.0 exhibited good tensile strength of 26.03 MPa and Young's modulus of 260.66 MPa. LP23-PUF2.0 displayed high hydrophobicity as indicated by the water contact angle of 96.8° and low surface free energy of 15.68 mN/m. Glass transition temperature (Tg) of LP-PUF varied depending on lignin content and NCO/OH molar ratio. Specifically, the increase of KL content from 23 % to 42 % induced big rise of Tg by 8 °C. The NCO/OH induced change of Tg was relatively weak, as indicated by the small increase of −2.71 °C of LP41-PU1.4 to −1.81 °C of LP41-PUF2.0. The results of this work offer insights for lignin utilization as structural component of high modulus and high strength polyurethane film.
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ACS Applied Nano Materials
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2024
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IF 5.3
Xiang Yu,Yuwei Mi,Zihan Gong,Yongfang Zhang,Lei Wang,Suyuan Zeng
Constructing heterojunctions is an effective strategy for increasing semiconductor photocatalytic activity. Herein, a Bi2O3/Bi4O5Br2 type-II heterojunction was synthesized using a simple one-pot solvothermal route. The 0-dimensional (0D) Bi2O3 nanoparticles are uniformly distributed within the 2D Bi4O5Br2 nanosheets with (101̅) facets dominantly exposed. In comparison with pure Bi2O3 and Bi4O5Br2, they show higher photocatalytic activity degradation of resorcinol (RO) and Rhodamine B (RhB). The Bi2O3/Bi4O5Br2 composite containing 10% Bi2O3 (BOB4) displays the best photocatalytic activity. For instance, compared with pure Bi4O5Br2 and Bi2O3, the k(RO) values of BOB4 (0.58 h–1) are 3.1 and 4.8 times higher. The enhanced photocatalytic activity is attributed to the formation of a large heterojunction interface that results from the homogeneous distribution of Bi2O3 nanoparticles in the Bi4O5Br2 nanosheet, which effectively enhances the photogenerated charge separation in a type-II mode. Major active species include superoxide radicals (•O2–), hydroxyl radicals (•OH), and holes (h+). In addition, the Bi2O3/Bi4O5Br2 photocatalysts exhibit outstanding resistance to inorganic ions, pH, water matrix, as well as outdoor sunlight and favorable stability and biocompatibility. This work presents a simple method to construct Bi-based heterojunction architectures for photoactivity improvement.
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CHEMOSPHERE
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2024
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IF 8.1
Jingyuan Yue,Xiaojin Hu,Huijun Xie,Zhen Hu,Haiming Wu,Jian Zhang,Bo Sun,Lushan Wang
Bisphenol A (BPA) in seawater tends to be deposited in coastal sediments. However, its degradation under tidal oscillations has not been explored comprehensively. Hydroxyl radicals (·OH) can be generated through Fe cycling under redox oscillations, which have a strong oxidizing capacity. This study focused on the contribution of Fe-mediated production of ·OH in BPA degradation under darkness. The removal of BPA was investigated by reoxygenating six natural coastal sediments, and three redox cycles were applied to prove the sustainability of the process. The importance of low reactivity Fe(II) in the production of ·OH was investigated, specifically, Fe(II) with carbonate and Fe(II) within goethite, hematite and magnetite. The degradation efficiency of BPA during reoxygenation of sediments was 76.78–94.82%, and the contribution of ·OH ranged from 36.74% to 74.51%. The path coefficient of ·OH on BPA degradation reached 0.6985 and the indirect effect of low reactivity Fe(II) on BPA degradation by mediating ·OH production reached 0.5240 obtained via partial least squares path modeling (PLS-PM). This study emphasizes the importance of low reactivity Fe(II) in ·OH production and provides a new perspective for the role of tidal-induced ·OH on the fate of refractory organic pollutants under darkness.
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Catalysts
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2024
·Vol. 14
·期 5
·296
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IF 3.8
Tianshui Li,Wei Liu,Huijun Xin,Qihao Sha,Haijun Xu,Yun Kuang,Xiaoming Sun
Water electrolysis is a crucial technology in the production of hydrogen energy. Due to the escalating industrial demand for green hydrogen, the required electrode size for a traditional alkaline water electrolyzer has been increasing. Numerous studies have focused on developing highly active oxygen evolution reaction (OER) catalysts for water electrolysis. However, there remains a significant gap between the microscale synthesis of catalysts in laboratory settings and the macroscale preparation required for industrial scenarios. This challenge is particularly pronounced in the synthesis of sizable self-supported electrodes. In this work, we employed a commercially available Raney Ni-coated Ni mesh as a precursor material to fabricate a self-supported NiFe(OH)x@Raney Ni anode with a substantial dimension exceeding 300 mm through a straightforward immersion technique. The as-prepared electrode exhibited remarkable electrocatalytic OER activity, as an overpotential of only 240 mV is required to achieve 10 mA cm−2. This performance is comparable to that of NiFe-LDHs synthesized via a hydrothermal method, which is difficult to scale up for industrial applications. Furthermore, the electrode demonstrated exceptional durability, maintaining stable operation for over 100 h at a current density of 500 mA cm−2. The large-scale electrode displayed consistent overpotentials across various areas, indicating uniform catalytic activity. When integrated into an alkaline water electrolysis device, it delivered an average cell voltage of 1.80 V at 200 mA cm−2and achieved a direct current hydrogen production energy consumption as low as 4.3 kWh/Nm3. These findings underline the suitability of electrodes for industrial scale applications, offering a promising alternative for energy-efficient hydrogen production.
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Catalysts
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2024
·Vol. 14
·期 3
·183
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IF 3.8
Jiarong Ma,Run Zhou,Yu Tu,Ruixin Ma,Daimei Chen,Hao Ding
Ni3Si2O5(OH)4rods (NS) were synthesized via a hydrothermal method, employing natural wollastonite as a template. The hierarchical Ni3Si2O5(OH)4rods exhibited vertically oriented nanosheets, resulting in a substantial increase in the specific surface area (from 2.24 m2/g to 178.4 m2/g). Subsequently, a CdS/Ni3Si2O5(OH)4composite photocatalyst (CdS/NS) was prepared using a chemical deposition method. CdS was uniformly loaded onto the surface of the Ni3Si2O5(OH)4nanosheets, successfully forming a heterojunction with Ni3Si2O5(OH)4. The CdS/NS photocatalyst in the presence of lactic acid as a sacrificial agent demonstrated an impressive H2production rate of 4.05 mmol h−1g−1, around 40 times higher than pure CdS. The photocorrosion of CdS was effectively solved after loading. After four cycles, the performance of CdS/NS remained stable, showing the potential for sustainable applications. After photoexcitation, electrons moved from Ni3Si2O5(OH)4to the valence band of CdS, where they interacted with the holes via an enhanced interface contact. Simultaneously, electrons in CdS transitioned to its conduction band, facilitating hydrogenation. The enhanced performance was attributed to the improved CdS dispersion by Ni3Si2O5(OH)4loading and efficient photogenerated carrier separation through the heterojunction formation. This work provides new perspectives for broadening the applications of mineral materials and developing heterojunction photocatalysts with good dispersibility and recyclability.
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Journal of Environmental Sciences
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2018
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IF 3.12
Xiaole Zhao,Yingchun Su,Shubin Li,Yajun Bi,Xiaojun Han
Dyestuffs and heavy metal ions in water are seriously harmful to the ecological environment and human health. Three-dimensional (3D) flowerlike Fe(OH) 3 microspheres were synthesized through a green yet low-cost injection method, for the removal of organic dyes and heavy metal ions. The Fe(OH) 3 microspheres were characterized by thermal gravimetric analysis (TGA), Fourier transform infrared (FT-IR), and transmission electron microscopy (TEM) techniques. The adsorption kinetics of Congo Red (CR) on Fe(OH) 3 microspheres obeyed the pseudo-second-order model. Cr 6 + and Pb 2 + adsorption behaviors on Fe(OH) 3 microspheres followed the Langmuir isotherm model. The maximum adsorption capacities of the synthesized Fe(OH) 3 were 308, 52.94, and 75.64 mg/g for CR, Cr 6 + , and Pb 2 + respectively. The enhanced adsorption performance originated from its surface properties and large specific surface area of 250 m 2 /g. The microspheres also have excellent adsorption stability and recyclability . Another merit of the Fe(OH) 3 material is that it also acts as a Fenton-like catalyst. These twin functionalities (both as adsorbent and Fenton-like catalyst) give the synthesized Fe(OH) 3 microspheres great potential in the field of water treatment .
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JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Wei Wang,Mengrui Li,Liang Liu,Xiaoshuang Zhou,Xiankai Li,Kewei Zhang,Lina Chen,Jun Wei,Long Chen
To meet the practical demands of flexible fiber-shaped supercapacitors (FSSCs) for wearable electronics, it's crucial to develop electrodes with both high energy density and flexibility. In this work, an ultrahigh capacitance (Co,Mn)(Co,Mn) 2 O 4 /Ni(OH) 2 (CMO/Ni(OH) 2 ) fiber electrode is designed. The (Co,Mn)(Co,Mn) 2 O 4 (CMO) nanosheets possessing large specific surface area and enriched active sites, which can be served as nano-substrate for the electrodeposition of Ni(OH) 2 . This special structure facilitates the exposure of more electroactive sites and accelerate rapid electrons transfer, resulting in boosted electrochemical performance. Benefiting from these advantages, the area capacitance of the CMO/Ni(OH) 2 electrode is up to 4787.6 mF cm −2 at 1 mA cm −2 , which is approximately 15 times higher than that of the CMO (311 mF cm −2 ), and 6.7 times higher than that of the Ni(OH) 2 (718 mF cm −2 ). Coupled with activated carbon (AC) electrode, the assembled all-solid-state CMO/Ni(OH) 2 //AC FSSCs demonstrate a high energy density of 89.45 μW h cm −2 at 1505 μW cm −2 , along with great flexibility and stability. Moreover, these devices can be integrated into clothes, and electronic watch, serving as an energy supply. This work offers a novel approach to designing high-performance fiber electrode for wearable flexible energy storage devices.
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ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Min Tang,Dong Wu,Yulun Nie,Chao Yang,Yong Li
The heterogeneous catalytic ozonation with natural iron oxides has been proven to be a powerful technology for the removal of recalcitrant organics in water due to the involvement of reactive oxygen species. However, little information can be obtained about the performance of Ferrihydrite in catalytic ozonation especially the relavant reaction mechanism. In this study, Ferrihydrite was synthesized via a simple precipitation method and 2,4-Dichlorophenoxyacetic acid (2,4-D) degradation was used to evaluate its catalytic ozonation performance. Compared with sole ozonation, Ferrihydrite had an excellent activity in catalytic ozonation and 2,4-D was always efficiently degraded (>90%) at a wide pH range (3.0–8.0). Electron spin resonance (ESR) and radical scavenging tests proved that • OH and O 2 •- were the dominant reactive oxygen species (ROS) in 2,4-D degradation (92.33% vs. 77.4% in ozone alone) and mineralization (63% vs. 16.2% in ozone alone). Based on a series of characterizations, Ferrihydrite processed a higher BET area and surface -OH groups than other iron oxides such as FeOOH, Fe 2 O 3 and Fe 3 O 4 . The efficiently exposed surface -OH group with a high density was the reactive centers for the generation of ROS. Importantly, pH PZC of Ferrihydrite (6.3) and pKa of 2,4-D (2.73) induced a pH-dependent 2,4-D removal patterns (surface reaction at pH < 6.3 and reaction in bulk solution at pH > 6.3) were proposed via the electrostatic attraction or repulsion between the hydrogenated/hydroxylated surface of Ferrihydrite and negative charged 2,4-D.
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POLYMER
·
2025
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IF 4.5
Zhanjian Liu,Ping Wang,Jing Jing,Meiling Li,Yuxin Fu,Xiguang Zhang,Huaiyuan Wang
Superwetting oil-water separation membranes are effective materials for treatment of wastewater containing emulsified oil, but the problem of membrane pollution remains a huge challenge during its long-term operation. In this study, we successfully developed a superhydrophilic/underwater superoleophobic membrane using a simple phase separation method. The fabrication process involved three key steps: (1) surface hydroxylation of pristine PVDF using NaOH etching to generate active hydrogen bonds and hydroxyl groups, (2) acrylic acid (AA) grafting onto the hydroxylated PVDF surface to introduce carboxyl functionalities, and (3) in-situ chelation of needle-like ZnO onto the AA-grafted matrix. The synergistic effect of the surface needle-like ZnO and the hydration layer endowed the PVDF-OH/AA@ZnO membrane with an outstanding oil-water separation efficiency of n-hexane up to 99.68 %, and higher than 98 % for various emulsions (e.g. kerosene, petroleum ether, chloroform, and dichloromethane) under gravity. Moreover, compared with the basement membrane, the tensile strength of the modified membrane increased from 106.21 kPa to 153.84 kPa, indicating its excellent mechanical properties under strong external forces. The PVDF-OH/AA@ZnO membrane demonstrated exceptional recycling performance, with a separation efficiency above 97.25 % after five cycles, and exhibited anti-fouling capability with simple water rinsing used to remove surface oil residues. Overall, this study provides a scalable strategy for the design of superhydrophilic/underwater superoleophobic separation membranes for the practical treatment of oily wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Zhixiang Zhai,Miaojing Pan,Jia Wu,Wenjie Jiang,Huan Wen,Shibin Yin
Urea is a common component present in both biological waste and water pollutants. Using it as an electrolyte substrate to replace the oxygen evolution reaction (OER) on the anode to assist hydrogen production is thermodynamically favorable and economically attractive. However, at high current densities (e.g., greater than 500 mA cm −2 ), the competitive adsorption of urea and OH − significantly limits the activity of the urea oxidation reaction (UOR). To overcome this challenge, this work designed and developed a catalyst consisting of a V-doped NiCo alloy, which is enclosed in an N-doped carbon layer. According to spectral characterization and density functional theory (DFT), the synergistic interaction between the N-doped carbon layer and V enhances the electron enrichment from the bulk to the surface. Meanwhile, the highly electronegative nitrogen atoms simultaneously regulate the local charge distribution of the carbon layer. This guarantees the optimal binding strength between reactants (urea and OH − ) and active sites. Consequently, V-NiCo@NC exhibits excellent urea oxidation performance ( E 10/1000 = 1.27/1.43 V RHE ). Additionally, the introduction of the N-doped carbon layer significantly improves the long-term durability of the catalyst, it can run steadily for 100 h at 1000 mA cm −2 . This work provides an approach for designing efficient UOR catalyst materials and offers insights for optimizing catalytic performance by balancing competing adsorption.
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IRANIAN POLYMER JOURNAL
·
2025
·
IF 2.8
Duan Qiancheng,Dong Xiang,Sun Zhiyu,Dai Guowei,Li De-long,Xie Le,Liu Song
A novel multifunctional flame-retardant DOPO-AS/M(OH)(OCH 3 ) (M = Co, Ni) was synthesized and incorporated into epoxy resin (EP) to prepare EP composites with enhanced flame retardancy and mechanical properties. Specifically, the DOPO-AS was synthesized using 3-aminopropyltriethoxysilane (APTES), salicylaldehyde (Salal), and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The 2D nanosheet M(OH)(OCH 3 ) was surface modified with DOPO-AS, thereby synthesizing the organic/inorganic nanohybrid DOPO-AS/M. The results showed that the addition of only 5% (by wt) DOPO-AS/M enabled EP to achieve the UL-94 of V-1 rating, with the limiting oxygen index (LOI) increasing from 28.7% to 31.0%. The thermogravimetric analysis (TGA) results demonstrated that the EP/DOPO-AS/M composite exhibited a significant enhancement in thermal stability compared to pure EP. Meanwhile, EP/DOPO-AS/M 5% composite showed significant reduction of 48.1%, 14.7%, 30.9%, and 22.7% in the peak heat release rate (pHRR), total heat release (THR), smoke production rate (SPR), and total smoke production (TSP), respectively. In addition, the tensile strength and elongation-at-break of the EP composite with 1% (by wt) DOPO-AS/M were increased by 13.5% and 3.2%, compared with pure EP. This work provides a novel and facile strategy for the simultaneous enhancement of flame retardancy and mechanical properties in EP composites, showing promising potential for practical applications. Graphical
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