ACS Applied Nano Materials
·
2022
·
IF 6.14
Zi-Yao Chen,Wen-Zhu Shao,Wei-Jian Li,Xue-Yin Sun,Liang Zhen,Yang Li
Due to the strong surface energy and polarity, ZnO nanoparticles are prone to adsorbing the OH groups dissociated from water in the air, leading to easy agglomeration and hence deteriorating the dispersion of ZnO in composites. In this work, it has been theoretically and experimentally demonstrated that doping with lower electronegativity metallic ions is an effective strategy to suppress the agglomeration of ZnO nanoparticles. By calculating the adsorption energies and electronic structures of OH/M-doped ZnO configurations (M = Li+, Cu2+, Al3+), it was found that metallic ion doping with a lower electronegativity (in comparison to that of the host Zn2+) can efficiently reduce the adsorption of OH groups on the ZnO surface due to the lower effective bond order of M–O bonds. Guided by the theoretical results, various M-doped ZnO nanoparticles (M = Li+, Cu2+, Al3+) were prepared and characterized by X-ray photoelectron spectroscopy and a laser particle sizer, which confirmed that the lower the electronegativity of dopants, the lower the OH groups’ adsorbed amounts and aggregate sizes of M-doped ZnO nanoparticles. This work provides a general avenue to design the composition of M-doped ZnO nanoparticles for suppressing agglomeration and enhance the dispersion of ZnO in composites.
研究领域:
材料科学
·
表面化学
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Zhiyi Zhang,Donglin Guo,Jiazheng Zhang,Changchun Ji,Haining Yu,Xiaojiong Yang
Lanthanum aerogels with high specific surface area up to 288 m 2 ·g −1 are synthesized by a modified sol-gel method combined with supercritical fluid ethanol drying. The lanthanum aerogels can be transformed into porous nanostructure composed of hexagonal La(OH) 3 crystal nanostructures with the specific surface area of 35 m 2 ·g −1 in large quantities after heat treatment at 600 °C in air. The room temperature magnetism of hexagonal La(OH) 3 crystal nanostructures is investigated by the density of states based on first-principles calculations. This work brings a promising route that can quickly produce lanthanum-based porous nanostructures in large quantities.
研究领域:
材料科学
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纳米技术
·
计算材料学
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Xingkun Zhu,Nan Zou,Hongchang Pang,Peng Tian,Guiling Ning
A high-efficient composite of flame retardant (CFR) composed of an aluminum hydroxide (ATH) core and an aluminum phosphate (AP) flower-like shell was synthesized by an in-situ growth method, which is low cost and easy-to-handle. It has been demonstrated that flame retardancy and smoke suppression of (ethylene-vinyl acetate) EVA/CFR were enhanced compared to EVA/ATH attributed to the high-efficiency heat barrier and gas isolation of ceramic char residues mainly composed of Al 2 O 3 porcelain agents and AlPO 4 sintering aids. Thus, the novel hierarchical core-shell AlPO 4 @Al(OH) 3 might supersede the ATH as flame retardants.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Chen Chen,Xu Guan,Hongbo Wang,Shijie Dong,Ping Luo
In this paper, a novel Al–Bi(OH) 3 system hydrogen-generating material is investigated. Hydrolysis experiments show that the hydrolysis properties of the Al–10 wt% Bi(OH) 3 composite are significantly improved by doping with sodium chloride, and the Al–10 wt% Bi(OH) 3 –5 wt% NaCl composite has a low activation energy (10.4 kJ mol −1 ). With the further optimization of milling time, the hydrogen yield of Al–10 wt% Bi(OH) 3 –5 wt% NaCl composite reaches 1000 mL g −1 in 1 min. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy and thermogravimetric analysis are applied to characterize the composite and explore the hydrolysis mechanism. The characterization results show that the activation of aluminum mainly comes from three factors: (1) The formation of alumina during ball milling plays an important role in preventing the agglomeration between Al–Bi, Al–Al and Bi–Bi; (2) Bismuth generated during ball milling can form micro-galvanic cell with aluminum to promote the corrosion of aluminum; (3) Sodium chloride as a grinding aid contributes to crush aluminum powder , and chloride ions facilitate the corrosion of aluminum in the hydrolysis process . In addition, the drying method and initial water temperature have a great influence on by-products. The composite is expected to be used in mobile emergency fuel cell due to its rapid hydrogen production capacity.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2018
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IF 4.155
Jiang Zi-Min,Xu Ting-Ting,Yan Cong-Cong,Ma Cai-Yun,Dai Shu-Ge
Here, we report our finding in the fabrication of novel porous urchin-like Ni2/3Co1/3(CO3)1/2(OH)·0. 11H2O (denoted as NC) nanomaterial composed of numerous nanoneedles through an one-step hydrothermal method, which deliveres a high specific capacity of 318 C g−1 at a current density of 1 A g−1. Moreover, an architectural composite electrode consisting of the porous NC nanoneedles wrapped by reduced graphene oxide (rGO) nanosheets exhibits large specific capacity (431 C g−1 at 1 A g−1), high rate capability and long cycling life (94% capacity retention after 5,000 cycles at 20 A g−1). The presence of rGO in the composite electrode greatly improves the electronic conductivity, providing efficient current collection for fast energy storage.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 34
·5512-5525
·
IF 5.342
Ming Zhang,Yifei Tu,Zibo Zhou,Guozhang Wu
The exo-hydroxyl group (exo-OH) on isosorbide (ISB) has long been asserted as a highly reactive moiety compared with the endo-hydroxyl group (endo-OH). In this study, calculations based on density functional theory and experiments without adding catalysts reveal that endo-OH has strong nucleophilic ability, and in the case of transesterification with diphenyl carbonate, the nucleophilic attack surmounts steric hindrance in rendering endo-OH more reactive than exo-OH. The kinetics of transesterification with different catalysts is investigated to determine the catalytic reactivity and molecular structure evolution. The results show that preferential activation of exo-OH moieties can be achieved either by reducing the coordination ability of catalytic cations (lg β1) or by enhancing the alkalinity of catalytic anions. Despite the low reactivity of exo-OH on ISB monomers, terminal exo-OH on carbonate oligomers exhibits higher reactivity than terminal endo-OH, justifying the experimental fact that ISB-based polycarbonates (ISB-PCs) are mostly terminated by endo-OH. Balancing the reactivity between endo-OH and exo-OH can be promoted by increasing the reaction temperature, thus accelerating transesterification to a high equilibrium constant. These findings help to clarify the mechanism of ISB transesterification and provide new strategies for the synthesis of high-molecular-weight ISB-PCs.
研究领域:
化学
·
材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Ting Li,Xiaomeng Wang,Yanmei Chen,Jianru Liang,Lixiang Zhou
Heterogeneous Fenton has become a promising economical and environmentally-friendly method for water treatment, however, the production of abundant radical resources (e.g., O 2 − , OH) are oftentimes limited by finite Fe 2+ species to activate H 2 O 2 . Therefore, development of a new iron-bearing solid modified with diverse functional groups for generating a large of radicals in heterogeneous Fenton is significance. Here, we constructed a Fe 3 O 4 -modified schwertmannite (Fe 3 O 4 /Sch) catalyst to activate H 2 O 2 , SO 4 2− and O 2 to produce three kinds of radicals in heterogeneous Fenton reaction. Specifically, Fe 3 O 4 /Sch catalyst was synthesized to improve its surface properties such as the contents of surface Fe 2+ species as H 2 O 2 or O 2 activators to produce OH or O 2 − , the SO 4 2− of Sch surface as SO 4 − precursor, and electron transfer between Fe 3+ and Fe 2+ . Degradation rate of ciprofloxacin (CIP) for 6 min was up to 97% in Fe 3 O 4 /Sch-H 2 O 2 system, which was higher than that in Sch-H 2 O 2 or Fe 3 O 4 -H 2 O 2 . After four successive cyclic experiments, degradation rate of CIP was still achieved 97% within 10 min in Fe 3 O 4 /Sch-H 2 O 2 system. The formation pathways of the relevant active radicals and the degradation pathways of CIP were also proposed by theoretically calculated and LC-MS data. This finding has not only developed an efficient heterogeneous Fenton catalyst, but also given a new idea of SO 4 − generation by modified iron oxyhydroxysulfate mineral for application of heterogeneous Fenton technology.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Linkun Liang,Xueping Zheng,Yifang Yao,Shenglin Liu,Jianzhong Wang,Wenshuai Liu,Chunxu Hu,Yuxuan He
In the context of hydrogen energy development, hydrogen production technology based on the hydrolysis of sodium borohydride (NaBH 4 ) has attracted considerable attention owing to its mild reaction conditions and the high-purity hydrogen generation. Nevertheless, the intrinsically sluggish hydrolysis kinetics of NaBH 4 require the development of non-noble metal catalysts that simultaneously achieve high catalytic activity and excellent durability. In this work, a molybdenum-doped cobalt hydroxide (MoO 2 -Co(OH) 2 ) catalyst was fabricated via a homogeneous urea precipitation approach, and its catalytic performance for H 2 generation from NaBH 4 hydrolysis was systematically evaluated. Concurrently, SEM, TEM, and XPS characterizations collectively elucidated the reaction pathway and electronic modulation mechanism involving Mo-doping-induced Co 2+ oxidation and oxygen vacancy generation. Additionally, this study demonstrates that the composite material possesses favorable surface hydrophilicity and exceptional synergistic catalytic activity. Through systematic modulation of the Mo/Co molar ratio, the MoO 2 -Co(OH) 2 catalyst achieved an exceptional hydrogen generation rate (HGR) of 9831.46 mL·min −1 ·g −1 at ambient temperature, concomitant with a markedly reduced activation energy (38.81 kJ·mol −1 ) relative to pristine Co(OH) 2 (68.97 kJ·mol −1 ). Furthermore, the catalytic performance of this system is comparable to, or even superior to, that of state-of-the-art Co-based catalysts. The superior catalytic performance was ascribed to the synergistic contributions of abundant defect sites afforded by the amorphous architecture, the intrinsically enhanced activity stemming from the electronic structure modulation, and the enhanced stability endowed by the compact microstructure.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Qian Li,Tong Yu,Tangze Deng,Jie Zhang,Jinwei Chen,Gang Wang,Zongbo Shi,Runsheng Zhuo,Ruilin Wang
Surface hydroxyl modulation on S-1 enables the rational design of PtCu catalyst. • Surface OH modulates particle surface density and promotes PtCu interaction. • The optimal 0.5Pt2Cu/S-1–950 demonstrated an approving PDH activity. Propane dehydrogenation (PDH) is a promising approach for propylene production. However, Pt-based catalysts suffer from severe coke deposition and metal sintering at high temperature, thus leading to a rapid deactivation and low propylene yield. Herein, a surface hydroxyl (OH) strategy is developed to modulate the dispersion and configuration of PtCu active sites on silicalite-1 (S-1). The precise regulation of OH density effectively optimizes the particle density of PtCu species. The properly introduced surface OH provides suitable sites to anchor the PtCu active sites with an enhanced catalytic activity and stability. The optimal 0.5Pt2Cu/S-1–950 catalyst achieves an initial propane conversion of 63.4%, propylene space–time yield of 0.60 g g cat. -1 h −1 , and exceptional long-term stability. Moreover, the catalyst also exhibits low coke formation rate with a total coke content of only 1.5 wt% after 6 h of reaction, thereby avoiding the coverage of active sites. The surface Si-OH-modulation offers an effective strategy for constructing high-efficiency Pt-based catalysts with an improved durability for propane dehydrogenation. Download: Download high-res image (111KB) Download: Download full-size image
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产品关联
DOI
高影响因子
Small
·
2026
·
IF 11.8
Zhiang Hou,Rui Hu,Yitong Chen,Jinnan Wang,Aimin Li
The spin state of oxygen intermediates constitutes a fundamental limitation to the four-electron oxygen evolution reaction (OER), impeding efficient photoelectrochemical water splitting. Herein, guided by the chiral-induced spin selectivity (CISS) effect, we design a chiral L-Co (3−x) Ni x O 4 /BiVO 4 photoanode that employs a chiral co-catalyst layer to accelerate the evolution of oxidative intermediates. Kinetic isotope experiments, in situ attenuated total reflection Fourier Transform infrared spectroscopy and density functional theory calculations demonstrate that aligning the spin states of charge carriers via chiral molecules facilitates the rapid conversion of * OH to * OOH. Meanwhile, this process effectively suppresses the formation of hydrogen peroxide (Faradaic efficiency < 10%) and improves photoanode stability. Consequently, the L-Co (3−x) Ni x O 4 /BiVO 4 photoanode achieves a photocurrent density of 5.41 mA·cm −2 at a potential of 1.23 V vs. the reversible hydrogen electrode, and maintains stable operation for over 100 h at the working voltage. This work unravels the underlying mechanism by which the CISS effect governs the OER pathway and mediates the formation of key reaction intermediates and provides a viable spin-engineering route to efficient and stable photoanodes.
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DOI
PubMed
高影响因子
Nature Communications
·
2026
·
IF 18.1
Li Yang,Wang Shuijing,Yuan Mingyue,Du Yu,Cai Yingying,Miao Tangying,Kou Jiahui,Yan Shicheng,Lu Chunhua
The realization of multi-energy water oxidation systems is impeded by the challenge of integrating multiple energy inputs. Here, we overcome this limitation via ultrasonic pre-treatment of the electrolyte, which triggers a mechano-electrochemical coupling effect through piezoelectric polarization. This process promotes a Grotthuss-type OH − state that weakens O-H bonds and increases the interfacial OH − concentration, thereby influencing the electrochemical reconstruction of Ni(OH) 2 to NiOOH and modifying water electrolysis pathways. These changes enhance Ni-O covalency and synergistically activate two low-energy water oxidation pathways on NiOOH involving lattice oxygen: one couples lattice oxygen with adsorbed oxygen, while the other facilitates direct lattice oxygen-oxygen coupling. Both routes bypass the high-energy * OOH intermediate typical of the conventional adsorbate evolution mechanism ( * OH → * O → * OOH → O 2 ), with the latter also avoiding * O adsorption entirely. Notably, just one minute of ultrasonic stimulation reduces the overpotential by 222 mV at 100 mA cm -2 . This pulsed-energy strategy thus offers an efficient and scalable approach to realizing multi-energy-enhanced water splitting.
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产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2026
·
IF 7.1
Luyong Zhang,Jianyi Zuo,Guangsheng Xu,Jinbin Fan,Xue Bai,Zhihua Yang,Fangfang Zhang,Shilie Pan
Deep-ultraviolet (DUV) birefringent crystals are essential for modern optical technologies, yet achieving a balance between large birefringence and a wide bandgap remains challenging. Although conventional borosulfates with alternating [BO4] and [SO4] tetrahedra connected by sharing corners possess a wide bandgap, they suffer from small birefringence due to weak optical anisotropy resulting from the presence of only tetrahedral groups. This work introduced advantageous “genes” [BO2(OH)] groups to modify the common [B(SO4)4] supertetrahedra for the first time and ultimately produced two borosulfates, Na3B3S2O11(OH)2 and K3B3S2O11(OH)2, striking the balance. Isolated fundamental building block (FBB) [B3O3(OH)2(SO4)2] was observed in the two compounds. Additionally, three conventional borosulfates featuring isolated [B(SO4)4] supertetrahedra, Na4KB(SO4)4, Na4RbB(SO4)4, and Na3Cs2B(SO4)4, were also obtained for comparison. Structural analysis and theoretical calculations reveal that the directional alignment of [BO2(OH)] groups significantly enhances the birefringence of the borosulfates. The calculated birefringence at 1064 nm increases by approximately 10-fold, specifically from 0.0035–0.0047 for the three conventional borosulfates to 0.043–0.044 for the two hydroxylated ones. This work demonstrates the effectiveness of employing [BO2(OH)] groups in optimizing the optical anisotropy of borosulfates, providing a design paradigm for exploring advanced DUV birefringent materials in borosulfates.
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产品关联
DOI
高影响因子
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