Advanced Sustainable Systems
·
2023
·Vol. 7
·期 5
·2200473
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IF 7.1
Jing Tang,Qingdong Ruan,Hongmin Yu,Chao Huang
Electrocatalytic water splitting generated oxygen (O 2 ) and hydrogen (H 2 ) is a promising way to solve the energy crisis. Oxygen evolution reaction (OER) compared to hydrogen evolution reaction (HER) has slow kinetics hindering overall process. Recently, cobalt hydroxide (Co(OH) 2 ) with high activity and stability for OER has attracted more attention. During the OER process, the Co 2+ in Co(OH) 2 is further oxidized to Co 3+ and CoOOH species are true active sites. However, the low conductivity of Co(OH) 2 hinders its oxidization to CoOOH. In addition, spontaneous growth of Co(OH) 2 agglomerates easily during hydrothermal treatment, leading to decreased active sites. Herein, an efficient strategy is developed to construct highly dispersive Co(OH) 2 nanosheets vertically grown on V 2 O 5 nanoflowers (Co(OH) 2 /V 2 O 5 ) at room temperature. The V 5+ of V 2 O 5 can oxidize Co 2+ of Co(OH) 2 into Co 3+ , resulting in in situ formations of CoOOH species favorable to the OER process. In situ Raman also investigates that the OH - species are inserted more easily into the interlayer of Co(OH) 2 of (Co(OH) 2 /V 2 O 5 ) than that of pure Co(OH) 2 . Therefore, the hybrid Co(OH) 2 /V 2 O 5 exhibits low overpotentials of 320 and 370 mV at a current density of 10 and 50 mV cm -2 , respectively, and a small Tafel slope of 68 mV dec -1 .
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PROGRESS IN ORGANIC COATINGS
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2017
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IF 2.858
Hongxia Wang,Ting Guo,Yanfen Zhang,Qingyan Zhang,Houbin Li
This paper prepared 4 inks mainly based on chitosan with different molecular weight and different mass percentage, and pigment (FeO(OH)·xH2O). The inks were characterized using Fourier transform infrared spectroscopy (FT-IR). Rheological properties were discussed by shear rate, time, temperature, oscillatory modulus, yield stress, and screen-printing simulation. Antimicrobial activity was analyzed by the growth inhibition zone. The inks were also applied to screen printing on substrates containing coated paper, nori, chocolate, etc. The print performance of the inks on coated paper was investigated by contact angle, optical density, print fastness and scratch resistance. 4 inks possessed obvious thixotropy and different linear viscoelastic regions. The experimental yield stress was 39 Pa and viscosity recovery rate was up to 76% after 105 s. Growth inhibition zone achieved 12.0 mm in diameter and optical density reached 1.2 with contact angle being 73°. The results indicate that the developed ink is applicable for screen printing.
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Polymers
·
2022
·Vol. 14
·期 21
·4494
·
IF 4.967
Wanming Teng,Yanyan Li,Ting Ma,Xiuyun Ren,Ding Nan,Jun Liu,Xiaohu Wang,Qin Yang,Jiaojiao Deng
Lithium metal batteries are emerging as the next generation of high-density electrochemical energy storage systems because of the ultra-high specific capacity and ultra-low electrochemical potential of the Li metal anode. However, the uneven Li deposition on commercial Cu current collectors result in low Coulombic efficiencies (CEs) and poor cycle life. In this research, we proposed the modification of ZnFx(OH)yon Cu foils to expand the lifespan. As-generated ZnLi alloy and LiF could promote uniform Li nucleation and deposition, thus resulting in an improved Li plating/stripping CE and extended cycle life. The Li-S battery with sulfurized polyacrylonitrile cathode and Li-ZnFx(OH)y@Cu anode (N/P ratio of 1.5:1) maintains 95% capacity after 60 cycles, proving the feasibility of ZnFx(OH)y@Cu for practical applications.
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Journal of Materials Chemistry A
·
2026
·
IF 9.5
Wensong Wang,Ying Tian,Xiuwen Cao,Xiang Liu,Shizhe Cao,Deheng Chen,Weizi Jiang,Mingtao Li,Weiwei Lin,Xun Sun,Shenjie Li,Yanyan Chen
The urea oxidation reaction (UOR), with its low theoretical potential, can replace the oxygen evolution reaction (OER) at the anode in water electrolysis, thereby reducing the thermodynamic barrier of electrochemical water splitting. However, in practical UOR electrocatalysts, the adsorption competition between urea and OH⁻ constitutes a kinetic bottleneck. Conventional catalysts lack dynamic regulation means, which ultimately leads to the occurrence of competitive adsorption. In this study, we constructed a CuxS/FeS/NF heterojunction electrocatalyst via hydrothermal methods, achieving highly efficient catalysis for UOR-assisted overall water splitting. The heterojunction features an open and disordered hierarchical porous structure, significantly increasing the specific surface area and active site density (with a double-layer capacitance of 8.33 mF cm -2 ). More importantly, the reversible Cu + /Cu 2+ valence cycling on the heterojunction surface dynamically modulates urea adsorption sites, addressing the issue of OH -occupying active centers and accelerating reaction kinetics (Tafel slope as low as 26.28 mV dec -1 ). In-situ Raman tests confirm that Cu 2+ forms strong coordination with -NH₂ via empty orbitals, while Cu + weakens the adsorption of OH⁻ through high electron density; the two species synergistically accelerate the reaction kinetics. Electrochemical tests reveal that in the UOR||HER system, CuxS/FeS/NF only requires a potential of 1.35 V vs. RHE to achieve a current density of 10 mA cm -2 , while for the HER, it needs merely 78 mV to reach the same current density. When applied to UOR-assisted overall water splitting in a 1 M KOH + 0.33 M urea electrolyte, the system requires only 1.440 V vs. RHE cell voltage to deliver a current density of 50 mA cm -2 and maintains stable operation for 60 hours, with a urea degradation rate of 66.4% after 20 hours. This work, through the dynamic regulation mechanism of copper valence cycling, provides a novel approach for designing UOR catalysts with both high activity and stability, holding significant application potential in low-energy hydrogen production and wastewater treatment.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.9
Yifei Huang,Hongliang Dai,Hongye Bai,Weiqiang Fan
Biomass materials as an abundant renewable resource could replace traditional fossil fuels and non-renewable materials, providing a new solution to achieve sustainable development. In this paper, Ce-modified Co(OH) 2 /Cu 2 O composite catalysts were prepared by an electrodeposition method, and the CoOOH/CuOOH dual active sites were successfully obtained through an electrochemical reconfiguration strategy, and the experimental results showed that the incorporation of Ce induced the formation of high-valent Co and Cu species, which improved the activity of electrocatalytic HMF oxidation. At 0.55 V vs Hg/HgO, the HMF conversion reached 100%, the FDCA yield was 95.04% and the Faraday efficiency was up to 98.47%. These results confirm the effectiveness of Ce-based non-precious metal catalysts in electrochemical reconstruction strategies and demonstrate their potential application in the high-value conversion of biomass derivatives. This finding not only provides a solid research basis for the development of highly efficient catalysts, but is also expected to promote the development of related technological fields.
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ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Huihui Wang,Shilin Zhou,Zhigang Wang,Shanling Xu,Song Dong,Yuqing Miao
Electrochemical conversion of metal hexacyanoferrates into their oxides or hydroxides was successfully achieved and reported using nickel hexacyanoferrates (Ni-HCF). Herein, a versatile strategy for such a conversion was explored by potential cycling Ni(OH) 2 nanoparticle film modified electrodes in K 3 [Fe(CN) 6 ] or K 4 [Fe(CN) 6 ] solution. The results show that K 3 [Fe(CN) 6 ] is more prone to the conversion from Ni(OH) 2 to Ni-HCF. Their composition , morphology, and structure were characterized by the techniques such as scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and UV–vis spectrometry . The reaction mechanism is tentatively given. This strategy is also suitable for the other metal hydroxides including rare earth hydroxides such as neodymium, samarium etc.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Juan Hou,Tianyu Zhou,Long Wang,Ping Zhang,Lan Ding
In this work, Zn(OH) 2 nanosheets embedded with carbon dots (CDs) were prepared through a template-free microwave-assisted route for the first time. The preparative strategy was facile, green and cost-effective. The final composites possessed uniform size distribution, good fluorescence property, excellent stability and fast adsorption ability for metal ions. A novel and ultrasensitive fluorescent assay has been proposed using CDs/Zn(OH) 2 composites as amplifying fluorescent sensors for rapid detection of Cu 2+ and Hg 2+ in real water samples. Aided by a Cu 2+ /Hg 2+ chelating agent, exclusive detection could be expected without cross-reactivity, as well as reversible and reproduced analysis. The detection limits were 0.3 nM for Cu 2+ and 0.2 nM for Hg 2+ , respectively. This assay could effectively enrich/separate and detect Hg 2+ and Cu 2+ simultaneously, revealing remarkable advantages including operational simplicity, high sensitivity, low cost and acceptable reproducibility.
研究领域:
材料科学
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分析化学
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环境科学
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纳米技术
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International Journal of Environmental Science and Technology
·
2026
·Vol. 23
·期 3
·209
·
IF 3.4
Omar S.,Omar M.,El-Subruiti G. M.,Attia N. F.,Eltaweil A.
This study presents a novel MgSn(OH) 6 /4CuS@HC photocatalyst developed via hydrothermal treatment followed by chemical precipitation. MgSn(OH) 6 /4CuS@HC was applied for wastewater treatment, targeting eight pollutants: Tetracycline, Doxycycline, Ofloxacin, 3-Nitroaniline, 2-Nitrophenol, Methyl red, Congo red, and Methylene blue. The novel photocatalyst was studied using FTIR, EDX, DRS, SEM, and PL techniques. To gain further insight into the reaction mechanism, scavenger experiments were conducted in addition to operational parameters such as pH, dosage, CuS loading on MgSn(OH) 6 @HC, pollutant initial concentration, selectivity, reusability, water source, and kinetic studies. The performance test highlighted the outstanding photocatalytic activity of templated MgSn(OH) 6 /4CuS@HC, exhibiting remarkable stability over five cycles. This performance is attributed to the direct Z-scheme mechanism and the hydrochar template, which improve charge separation, extend photocharge lifetime, and reduce the agglomeration of nanosemiconductors, thereby enhancing overall stability. This study offers a new perspective on green photocatalysts for diverse environmental applications.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Yong Zheng,Haobin Wu,Shouchao Zhong,Xun Kan,Ye Song,Fujian Liu,Wei Lin,Jianchun Wang,Lilong Jiang
The development of efficient and reusable sorbents for SO 2 removal from flue gas has attracted considerable attention. Herein, we report a “chainmail” structured Ca-based SO 2 sorbent by encapsulating Ca species within ordered mesoporous carbon (OMC), denoted as Ca(OH) 2 @OMC- x , where x denotes the Ca(OH) 2 mass fraction (wt%). The OMC was prepared via a one-step solvent-free mechanochemical assembly: the precursors and a block copolymer template (Pluronic F127) were ground to form a preorganized composite, followed by solidothermal treatment and calcination to remove the template and carbonize the polymer. The obtained OMC was then impregnated with a Ca precursor and calcined to strengthen interfacial interactions, encapsulating the Ca species within the OMC framework. Finally, steam treatment converted the confined Ca species into finely dispersed Ca(OH) 2 active domains. The resulting Ca(OH) 2 @OMC- x exhibits a large BET surface area (169.4–290.3 m 2 /g), long-range ordered mesoporosity with a narrow pore size distribution (∼5.5 nm), and well-dispersed Ca active phases with enhanced stability. Consequently, Ca(OH) 2 @OMC- x serves as an efficient and reusable solid sorbent for SO 2 capture, exhibiting a high SO 2 adsorption capacity of 11.24 mmol/g and maintaining 98.6% of its initial capacity after five adsorption–desorption cycles. This study provides an effective “chainmail encapsulation” materials design strategy for scalable SO 2 abatement under complex flue gas conditions.
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ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Runxian Zhu,Dalang Chen,Zetong Chen,Jianglin Liu,Xiaofei Wang,Yanlin Qin,Xueqing Qiu,Xuliang Lin
Efficient seawater oxygen evolution requires electrocatalysts that combine high activity, chloride tolerance, and long-term durability. Herein, a phosphorus–lignin ligand strategy is developed to construct an activation-prone P-CoMoO 3 @PLC precatalyst. Phosphorylated lignin enables homogeneous Co/Mo coordination, lattice P incorporation, oxygen-vacancy generation, and conductive carbon confinement, producing a metastable CoMoO 3 lattice with perturbed Co-P-Mo/Co-O-Mo coordination environments. P-CoMoO 3 @PLC requires only 180 mV at 10 mA cm −2 in simulated seawater, and sustains 500 mA cm −2 in natural seawater, outperforming commercial RuO 2 in durability. Operando analyses reveal an activation-induced dissolution–reconstruction pathway, in which partial Mo/P leaching converts the precatalyst into a Co(OH) 2 -derived CoOOH-rich interface coupled with residual CoMoO 4 . Co(OH) 2 -like species serve as hydroxylated intermediates, whereas CoOOH-like sites constitute the active OER phase; residual CoMoO 4 and the lignin-derived carbon matrix stabilize the reconstructed layer and promote charge transport. DFT calculations further show favorable *OH formation but thermodynamically unfavorable *Cl adsorption, explaining the preferential OER pathway and suppressed chlorine-related reactions. This work establishes bio-ligand metastability and reconstruction-driven interface engineering as a robust design strategy for seawater electrolysis.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Xiaojun Tang,Wenhao Lv,Song Lv
Customized Co(OH) 2 interface layer designed by electrodeposition. • The NF@[Co] 120 /Mn/[Co] 60 composite electrode integrates "conduction-adhesion-protection" functions. • Achieves high volumetric capacitance and excellent cycling stability. • Provide a novel design strategy for next-generation flexible and wearable energy storage devices. The in-situ synthesized nickel foam(NF)/manganese dioxide(MnO 2 ) electrode shows great promise for flexible supercapacitors owing to its high theoretical capacity, abundance, and eco-friendliness. However, the practical application of MnO 2 is hindered by poor conductivity, significant volume expansion, dissolution in electrolytes, and weak adhesion to smooth NF. To address these challenges, this work leverages the advantages of high conductivity and interface modification offered by Co(OH) 2 to precisely construct a sandwich-structured composite electrode(NF@[Co] 120 /Mn/[Co] 60 ) at the MnO 2 interface layer, which integrates conductive, adhesive, and protective functions. Benefiting from the advanced structure, the composite electrode exhibits outstanding electrochemical performance. NF@[Co] 120 /Mn/[Co] 60 achieves a capacitance of 340.31 F g −1 at 1 mA cm −2 , with a capacitance retention of 196.05 F g −1 when the current density increases to 20 mA cm −2 , and a capacity retention rate of 86.68% after 9000 cycles. Moreover, by utilizing the smooth and continuous macroscopic interface of the outermost Co(OH) 2 nanosheets, we integrated it with hydrogel electrolyte to assemble flexible supercapacitor (NF@[Co] 120 /Mn/[Co] 60 //PAA//AC). This device delivers an energy density of 74.95 Wh kg –1 at a power density of 994.94 W kg –1 and demonstrates excellent mechanical flexibility. This novel structural design provides a new electrode system strategy for the development of flexible wearable energy storage systems. Download: Download high-res image (197KB) Download: Download full-size image
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Biochar
·
2026
·Vol. 8
·期 1
·113
·
IF 15.1
Zhang Jian,Xie Jiafang,Zhu Shuhui,Yang Jiacheng E.,Weng Bo,Zheng Yuming
Biochar optimized with oxygen-containing functional groups is believed to be beneficial for peroxymonosulfate (PMS) activation, and biochar-loaded Co 3 O 4 -based catalysts are expected to be one of the most promising PMS activators for the efficient removal of organic pollutants. Nevertheless, the real active sites on Co 3 O 4 catalysts are still in debate due to insufficient experimental evidence. Herein, Co 3 O 4 growing on the oxygen-containing functional groups optimized rice husk biochar (RHBA) was synthesized (RHBA@Co 3 O 4 ), and RHBA800@25Co 3 O 4 + PMS system achieved complete degradation (100%) of refractory levofloxacin (LFX) within 4 min. The superior catalytic performance was suggested to be attributed not only to the uniform dispersion of Co 3 O 4 , but also to the transformation of lattice oxygen in Co 3 O 4 , which was found to play an important role in the catalytic process by inducing the formation of Co 3 O 4−α –OH. Meanwhile, density functional theory (DFT) calculations indicated that the adsorption energy ( E ads ) of PMS on Co 3 O 4−α –OH was far lower than that on Co 3 O 4 . Moreover, both radical and non-radical pathways were indicated to be involved during the degradation process. Additionally, the practical application of RHBA@Co 3 O 4 was investigated using various antibiotics, actual water environments, and fixed-bed reactors. The results showed that it possessed good practical degradation performance and significantly reduced the toxicity of intermediate products. This work provides a fresh insight into the catalytic mechanism of RHBA800@25Co 3 O 4 for PMS activation and wastewater treatment, offering a new perspective on the catalytic mechanism of Co 3 O 4 -based materials. Highlights
RHBA800@25Co 3 O 4 exhibited ultrafast antibiotics degradation via peroxymonosulfate activation.
Inspired formation of Co 3 O 4−α –OH by lattice oxygen induction was explored.
Ecological safety of levofloxacin degradation products was verified through antibacterial experiments.
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