Journal of Materials Chemistry A
·
2025
·
IF 9.5
Qingyun Liu,Yi Wang,Tianzhao Hu,Shaorui Chen,Yaozu Wang,Hui Zhao,Wu Zhang,Zhigang Yuan,Yulian Wang,Zhenhua Sun,Feng Li
Achieving high energy density in aqueous asymmetric electrochemical capacitors hinges on the development of electrode materials that combine exceptional capacitance with superior conductivity. Despite its high theoretical capacitance, Ni(OH)2 is limited by low intrinsic conductivity, significantly limiting its performance. In this study, a Mn–Ni(OH)2@1T-MoS2 heterostructure was synthesized through a facile growth method, achieving significant electrochemical performance boost. The lattice matching at the heterointerface induces a controlled lattice expansion in Mn–Ni(OH)2, while the interfacial interactions promote electron transfer from Mn–Ni(OH)2 to 1T-MoS2. These synergistic effects enhance conductivity and active site utilization, addressing the core challenges of pristine Ni(OH)2. As a result, the heterostructure exhibits a high specific capacity of 244.2 mA h g−1 at 1 A g−1 and a rate capability of 51.4% at 12 A g−1. Moreover, the assembled asymmetric electrochemical capacitor delivers an energy density of 61.67 W h kg−1 at 600 W kg−1 and maintains 72.7% capacity retention after 10 000 cycles at 5 A g−1. This work not only highlights the critical role of heterointerfaces in enhanced electrochemical performance but also provides a robust strategy for designing high-performance energy storage systems.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zunjie Zhang,Bingcheng Ge,Mengran Liu,Tianfang Yang,Shuaitong Wang,Yang Liu,Yingjie Yang,Shuyan Gao
The electrocatalytic reduction reaction of nitrate (NO3RR) is anticipated to convert nitrogen-containing pollutants into valuable ammonia products. Copper-based catalysts have received great attention because of their good performance in the NO3RR due to the strong binding energy with *NO3 intermediates. However, the poor H2O dissociation ability of Cu is unable to provide H• in time for the hydrogenation reaction of NOx, thus hindering the electroreduction of the NO3–. Herein, we designed a shell–core nanocube electrocatalyst Cu2O@Ni(OH)2-x (x represents the molar ratio of Ni/Cu) using the liquid phase reduction combined with the etching and precipitation method for electrocatalytic NO3RR. Due to the synergistic effect between the strong nitrate activation ability of Cu and the excellent H2O dissociation ability of Ni(OH)2, Cu2O@Ni(OH)2-3.3% shows an impressive ammonia yield rate (557.9 μmol h–1 cm–2) and Faradaic efficiency (97.4%) at −0.35 V vs. RHE. Operando Raman and Auger electron spectroscopy observe the reduction of Cu2O to Cu during the NO3RR process. Density functional theory calculations combined with electron paramagnetic resonance analysis reveals that Ni(OH)2 can lower the activation energy barrier of H2O dissociation, thereby promoting the generation of H• and accelerating the hydrogenation of *NO during the NO3RR. This research provides an efficient Cu-based catalyst for reducing NO3– and may motivate the development of effective ammonia electrocatalysts for further experimentation.
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Chenjie Liu,Yijin Wang,Wenlong Xu,Ming Zhou,Fuliang Meng,Xianfeng Meng
In light of electromagnetic pollution caused by the excessive or unregulated use of electromagnetic waves (EMWs), there is an urgent requirement to identify economical EMWs absorption materials. However, the facing challenge lies in the precise design of microstructure and the controlled tuning of electromagnetic parameters. Herein, natural cottonwood fiber was converted into carbon fiber (CF) through optimized pyrolysis, followed by the synthesis of CFs@Co 3 O 4 /Co(OH) 2 composites via in situ hydrothermal method. Ingenious structural design, multi-faceted synergy and heterogeneous interfaces endowed the CFs@Co 3 O 4 /Co(OH) 2 composites with exceptional impedance matching and electromagnetic loss, showing outstanding EMWs absorption ability. The CFs@Co 3 O 4 /Co(OH) 2 sample (CF S @Co-25) with 2.5 mm thickness displayed a maximum reflection loss ( RL max ) of −78.7 dB and an effective absorption bandwidth ( EAB ) of 9.9 GHz. At 3.0 mm matching thickness, the impedance matching value ( Z ) reached 0.99, with an RL max of −105.3 dB. This work offers a scalable and economical approach to developing high-performance carbon-based EMWs absorbers.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Haotian Hao,Yao Zhang,Shuo Xu,Zihao Wang,Yili Wang,Shan Wang,Baoyou Shi
Enriching low-concentration phosphorus in water is prerequisite for phosphorus recovery. In this study, a polyvinyl alcohol (PVA)-assisted high-temperature stabilization method was developed to synthesize a magnetically recoverable La(OH) 3 -Fe 2 O 3 composite, designated as PMLH, via stable crosslinking. Compared with MLH-1, a conventionally synthesized La(OH) 3 /Fe 2 O 3 composite, PMLH-1 (La/Fe molar ratio = 1:1) exhibited 31.77 % more La(OH) 3 adsorption sites and maintained 2.32 times higher phosphate adsorption capacity after 10 reuse cycles. The optimal synthesis conditions were determined as calcination temperature of 150 °C, PVA dosage of 0.375 %, and La-to-Fe molar ratio of 1.5. Structural characterization revealed that PMLH-1.5 consisted of rod-like La(OH) 3 and irregular γ-Fe 2 O 3 tightly bonded via PVA bridging. The composite demonstrated a maximum phosphate adsorption capacity of 79.51 mg P/g, reaching equilibrium within 16 h at 0.5 g/L dosage. The saturated adsorption remained stable across pH 3–9. While coexisting NO 3 − and humic acid showed negligible effects, Mg 2+ , Cl − , SO 4 2− and HCO 3 − reduced adsorption by 10–20 %, whereas Ca 2+ significantly enhanced phosphate uptake. Notably, PMLH-1.5 exhibited exceptional practical performance, exceeding its theoretical saturation capacity by 20 % with prolonged adsorption in real water matrices. Efficient desorption (4 h) was achieved using 2.5 M NaOH/1.875 M NaCl mixed solution. The PMLH-1.5 demonstrated remarkable stability across 40 consecutive adsorption-desorption cycles using actual water samples, consistently meeting discharge standards for 13–14 full cycles. This performance established a new reference point for cyclic durability assessments in water treatment research. Sequential desorption in the same desorbent progressively concentrated phosphorus from 0 to 26.69 mg/L, enabling effective low-concentration phosphate enrichment. Economic analysis confirmed that PMLH-1.5 exhibits a competitive chemical cost, ranging from 3.28 to 5.26 CNY/mol P (0.46 to 0.74 US $/mol P).
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ChemSusChem
·
2021
·Vol. 14
·期 16
·3382-3390
·
IF 8.928
Ting Feng,Jing Ding,Haiyan Li,Wei Wang,Bohua Dong,Lixin Cao
Graphical In hot water : CeO 2 /A−Fe(OH) 3 composites synthesized by a secondary water bath at 100 °C exhibit superior photocatalytic activity. A−Fe(OH) 3 increases specific surface area, passivates the surface of CeO 2 , and reduces the activation energy of water oxidation. This work provides a new insight into exploring amorphous cocatalysts to enhance photocatalytic O 2 evolution activity and augment the possibility of overall water splitting based on CeO 2 . Noble-metal-free composites with good photocatalytic property are of great interest. Here, CeO 2 nanorods composites loaded with amorphous Fe(OH) 3 cocatalyst were designed and prepared via a secondary water bath at 100 °C. The as-synthesized CeO 2 /amorphous Fe(OH) 3 composites exhibited superior light photocatalytic activities compared to pure CeO 2 , especially the sample with a loading time of 60 min. The photocatalytic oxygen generation rate could reach to 357.2 μmol h −1 g −1 , and the average apparent quantum yield (AQY) was 24.67 %, which was a 5.5-fold increase compared to the CeO 2 sample. The improvement of photocatalytic performance could be ascribed to three main reasons: First, loading the amorphous Fe(OH) 3 enlarged the specific surface area and passivated the surface of the pristine CeO 2 . Second, the amorphous Fe(OH) 3 ,which acted as a cocatalyst, provided many active sites, and reduced the reaction activation energy. Thirdly, the maximum interface with intimate contact between CeO 2 and amorphous Fe(OH) 3 cocatalyst accelerated the photogenerated charge separation efficiency and thus improved the photocatalytic performance of CeO 2 in photocatalytic water oxidation.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 2
·1-12
·
IF 2.132
Sun Xueying,Li Siqi,Liu Rongmei,Sun Xiulun,Liu Xinjie,Li Anran,Li Wen
In this work, we designed a simple hydrothermal synthetic method for a ZnCo-PBA@α-Co(OH) 2 nanosphere@nanosheet material with good electrochemical properties. The obtained material had a specific capacitance of 423.92 F g −1 at 1 A g −1 and a cycling retention ratio of 78.48% after 1000 cycles at 5 A g −1 . A hybrid supercapacitor device (ZnCo-PBA@α-Co(OH) 2 //AC) assembled with activated carbon as the negative electrode had a specific capacitance of 122.4 F g −1 at 1 A g −1 , a cycling retention rate of 73.53% after 5000 cycles at 5 A g −1 , and a very high energy density of 49.13 Wh kg −1 at power density of 1734.0 W kg −1 . The significantly improved electrochemical performance of the ZnCo-PBA@α-Co(OH) 2 nanocomposites can be attributed to the positive synergistic effects of the porous structure of the PBA material and the large specific surface area of the α-Co(OH) 2 nanosheets, on the ion permeability and number of active sites in the reinforcing material; thus, this composite is a potential material for use in future energy storage systems.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Bin Ou,Jixiao Wang,Ying Wu,Song Zhao,Zhi Wang
A new electrode for photoelectro-Fenton (PEF) process was fabricated by electrochemical deposition of g-C 3 N 4 on the surface of graphite felt (GF). The modified electrode was characterized by scanning electron microscope, contact angle, X-ray photoelectron spectroscopy, cyclic voltammetry and current-time curves, the morphology and surface physicochemical properties after the electrochemical modification were obviously changed. The g-C 3 N 4 /GF electrode shows good electrochemical performance such as an improvement of the redox current and exhibits great photocatalysis under the light irradiation compared to raw GF. This new electrode improved significantly the generation of hydrogen peroxide, which was confirmed by the cyclic voltammetry. The electrons transfer to the cathode through the external circuit and O 2 was reduced into H 2 O 2 , which was catalyzed by g-C 3 N 4 through two-electron process, and the produced H 2 O 2 was further reduced by the Fe 2+ to •OH. Additionally, the degradation of aniline was investigated by g-C 3 N 4 /GF electrodes in an undivided cell at pH = 3.0 under the visible light irradiation. After 10 cycles, the mineralization ratio was still above 91% using the modified electrode, demonstrating that the modification method could effectively improve the PEF and benefit its environmental applications.
研究领域:
环境科学
·
材料科学
·
化学工程
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Xiaojun Deng,Ping Zhou,Xiayan Yan,Renjin Xiong,Huaqin Kou,Wenhua Luo
To spare the use of OSDA and fluorides, for the sake of reducing cost and environmental conservation, a green and efficient synthesis recipe of low-silica CHA zeolites has been demonstrated, without using seeds or any other zeolites. The main factors that determine the formation of CHA zeolites have been investgated systemmatically, and several rules are obtained. (i) just considering simple memallic cations acting as the SDA , K + is indispensable for the formation of CHA framework, with noting that K + can also direct to MER topology. (ii) working as catalyst or minerization agent, OH − and F − function almost identically, but when the concentration of F − has reached a really high level or even only F − was used, CHA framework can not form because the intermediate fluoride complexes are inclined to produce small melecules of fluoride salts with morderate solubility over to enter the zeolite framework. (iii) at conditions of this work, the second stirring after the RT aging should be adopted since the contrastive tests have showed the benifits of the second stirring in making fewer or smaller impurity grains. (iv) when the concentration of K + is too high in reactive gels, with the other same conditions, MER over CHA framework is preferentially to form. (v) it is reasonable to consider the as-synthesized K-CHA materials can be used to research the novel “trapdoor” effect later. The authors considered the discussions and conclusions would offer some beneficial references to the green synthesis of zeolites and further understanding of the mechanism of hydrothermal treatment .
研究领域:
材料科学
·
环境化学
·
无机化学
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Zihao Guo,Zeqi Liu,Chaoxuan Wang,Lei Qian
Here, oxygen vacancy was introduced into hexagonal β-Ni(OH) 2 (NV) nanosheets to prepare poly (vinylidene fluoride-co-hexafluoropropylene)-based dielectric composites. Oxygen vacancy gradients were controlled, and the enhanced effects on energy storage performance were systematically investigated. It was found that the oxygen vacancy elevated the Ni 2+ /Ni 3+ ratio, shifted the Fermi level downward and induced formation of deep trap states. The moderate oxygen vacancies produced uniformly distributed deep strap states, which delayed the carrier migration by the capture-release mechanism. The Fermi level (E v − E f ) of NV 1.5 was 1.064 eV and showed the smallest energy separation from the valence-band, resulting in the highest interfacial potential barrier and inhibiting the charge injection. So, the oxygen vacancy obviously affected leakage current, breakdown strength and energy density. It was observed that leakage current density of the composites reduced to 3.48 × 10 −8 A/cm 2 . At the 0.3 wt% loading of NV1.5, the composite achieved a breakdown strength of 792.97 kV/mm and an energy density of 21.15 J/cm 3 (88.17 % over the matrix), with charge–discharge efficiency of 74.12 % and below 1 % performance degradation after 10 4 cycles. This work establishes a novel route based on defect engineering for dielectric storage materials at the atomic level. Download: Download high-res image (101KB) Download: Download full-size image
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ENVIRONMENTAL RESEARCH
·
2026
·
IF 8.2
Fengling Jiang,Ziwei Lan,Yongzheng Ma,Yuan Zhang,Xiaoqing Li,Dickon H.L. Ng,Jia Li
Micro/nanomotors have demonstrated significant potential in environmental monitoring and water remediation owing to their enzyme-like catalytic properties and self-driven ability. Herein, we developed a conical Co(OH) 2 @MnO 2 micromotor through an integrated oil bath-hydrothermal synthesis strategy. The micromotors feature MnO 2 nanosheets arranged in a two-dimensional cross-array architecture on their microconical surfaces, which effectively catalyze H 2 O 2 decomposition to produce oxygen bubbles, enabling robust self-propulsion. The speed of the micromotor can reach 138.59 ± 2.03 μm/s in7 wt% H 2 O 2 solution. The combination of excellent enzyme-like activity and self-driven ability of micromotor constructs a dynamic sensitive detection platform for resveratrol (RES, 3,4′,5-trihydroxystilbene), a potential pollutant in water, with a low concentration detection limit of 0.23 μM. In addition, hydrogen peroxide and peroxymonosulfate (PMS) were used as catalytic substrates to catalyze the micromotor to generate various reactive oxygen species (ROS), thus achieving efficient synergistic degradation of resveratrol. Under neutral pH conditions, the degradation rate of resveratrol by the micromotors was 91.6% within 40 min. This study provides an intelligent strategy for developing dynamic sensors with the dual functions of detecting and degrading RES simultaneously.
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ACS Applied Energy Materials
·
2026
·
IF 5.5
Chenyang Fan,Haiwen Tan,Jin Gan,Chunyan Han,Yikun Cheng,Liyang Xiao,Rui Zhang,Pengfei Yin,Cunku Dong,Hui Liu,Xiwen Du,Jing Yang
Platinum-based noble metal cathodes employed in industrial alkaline water electrolyzers are highly susceptible to iron impurities present in the alkaline electrolyte, which significantly shorten their operational lifetime. In this work, a facile alloying strategy was developed to construct ternary PtNiCu and PtNiFe electrodes using nickel foam (NF) as the substrate. The incorporation of Cu or Fe as a third metal effectively modulates the electronic structure of Ni sites in the PtNi alloy, inducing a downward shift of the Ni d-band center. This electronic regulation weakens OH- adsorption on Ni sites, thereby suppressing surface hydroxyl accumulation and reducing the nucleation and deposition of iron species in the form of iron oxides. As a result, the stability of the electrodes in the Fe-containing alkaline electrolyte is markedly enhanced. Both ternary alloys exhibit substantially improved durability compared with pristine PtNi under Fe-contaminated conditions. Among them, PtNiCu delivers a lower initial overpotential, whereas PtNiFe demonstrates superior long-term stability. After 12 h of hydrogen evolution reaction operation at 400 mA cm−2 in a 6.0 M KOH electrolyte containing 5 ppm FeCl2 at 80 °C, the overpotentials of PtNiCu and PtNiFe are reduced by 152 and 151 mV, respectively, relative to PtNi. Moreover, the amount of deposited iron oxides on PtNiCu and PtNiFe is only about 50 and 25% of that on PtNi, respectively, confirming their much stronger resistance to Fe-induced deactivation.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·Vol. 60
·期 32
·22813-22822
·
IF 12.2
Gao Jigang,Liu Peiqi,Huang Yukai,Hu Yulong,Zhou Zhongyue,Yuan Wenhao,Zeng Meirong
Lipid oxidation driven by intermolecular interactions
plays a pivotal
role in human aging and indoor environmental quality, yet the underlying
interaction mechanisms remain largely elusive. Here, we uncover a
coupled autoxidation network in the heterogeneous co-ozonolysis of
model skin lipids (cholesterol and fatty acids), using online atmospheric
pressure photoionization coupled with an ultrahigh-resolution mass
spectrometer. Individual cholesterol exhibited extremely low heterogeneous
reactivity (determined as effective uptake coefficient, γ eff, Chol = 2.94 × 10 –6 ). However,
upon co-ozonolysis with fatty acids (oleic or linoleic acid), its
reactivity was enhanced by 31-fold (γ eff, Chol = 9.11 × 10 –5 when mixed with linoleic acid),
and elevated relative humidity further amplified this effect by an
additional 3-fold. The identification of α-alkoxyalkyl hydroperoxides,
α-acyloxyalkyl hydroperoxides, hydroxyalkyl hydroperoxides,
and secondary ozonides provides direct molecular evidence that Criegee
intermediates (CIs) drive the co-ozonolysis interaction network. Furthermore,
the detection of highly oxygenated molecules reveals that • OH reactions are triggered by CIs and hydroperoxide decomposition,
establishing a free-radical chain propagation pathway that further
accelerates autoxidation. We propose a novel interactive lipid autoxidation
mechanism: initiated by lipids’ co-ozonolysis, propagated via
CI-driven interactions, and amplified by • OH-mediated
radical chemistry. These findings unveil a coupling mechanism of CIs
and • OH pathways in governing the heterogeneous
reactivity of naturally coexisting lipids, providing fundamental insights
into their impacts on biological aging and environmental evolution.
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