ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Hongchen Liu,Fan Yang,Zhusong Xu,Xingru Yan,Fengjiang Chen,Chong Xu,Sai Che,Yongfeng Li
The exploration of bifunctional transition metal-based catalysts for water electrolysis is important for clean and large-scale production of hydrogen but yet remains challenging. Herein, a novel phosphorous doped cobalt-copper aerogel (P-CoCu) with three-dimensional interconnected structure was prepared via spontaneous gelation and in-situ P doping process. The electronic structure and charge density of Co could be modulated upon alloying with Cu, resulting in optimized charge transfer efficiency and proton adsorption energy. The hydrophilicity and the bond strength of H* were further optimized through P doping, which promoted the reaction efficiency on the surface of P-CoCu. Besides, the unique porous morphology of aerogel endowed the catalyst with efficient mass transfer pathways and abundant active sites. Density functional theory (DFT) calculations further revealed the electron redistribution and the optimization of H 2 desorption performance through Cu alloying and P doping. Based on the outstanding features, the optimized P-CoCu sample achieved extremely low overpotentials of 74/224 mV for hydrogen evolution reaction (HER) / oxygen evolution reaction (OER) at a current density of 10 mA·cm −2 in 1 M KOH electrolyte. Additionally, a two-electrode electrolytic cell assembled with P-CoCu only required an operating voltage of 1.57 V at 10 mA·cm −2 with decent stability, which was comparable to commercial noble-metal catalysts (Pt/C//RuO 2 /C) and superior to recently published electrocatalyst. This work provides an anticipated perspective of non-noble metal-based bifunctional catalysts for overall water splitting.
研究领域:
材料科学
·
催化化学
·
能源转换
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Sen Liao,Fawei Zhu,Xinyi Zhao,Hua Yang,Xiaoqing Chen
In this work, phosphorus, nitrogen co-doped carbon quantum dots (P,N-CQDs) as highly selective fluorescent probe for cobalt ion (Co 2+ ) detection were designed and synthesized via a one-step hydrothermal protocol by employing pyridoxal 5-phosphate and ethanediamine. This probe enables selective detection of Co 2+ with a linear range of 0–60 μM and a limit of detection of 0.053 μM through variation in fluorescence with respect to target concentration and electron-transfer from P,N-CQDs to Co 2+ . Furthermore, ethylenediaminetetraacetic acid-modified Fe 3 O 4 @SiO 2 (Fe 3 O 4 @SiO 2 -EDTA) was tailor-designed and prepared to successfully realize the recovery of P,N-CQDs/Co 2+ fluorescence for the first time. The reusable P,N-CQDs as fluorescent sensors for Co 2+ also show good linearity and sensitivity. Ultimately, this fluorescent probe was applied in the analysis of real river water samples.
研究领域:
分析化学
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环境科学
·
材料科学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Huali Zeng,Baojie Liu,Jiao Li,Mei Li,Meijiao Peng,Chengrong Qin,Chen Liang,Caoxing Huang,Xinping Li,Shuangquan Yao
Lignin separation is an important procedure that benefits multiple industries and in particular biomass transformation efforts. In this study, bagasse lignin was separated by freeze–thaw-assisted p -toluenesulfonic acid ( p -TsOH) pretreatment . The optimal conditions were freezing temperature −60 °C, freezing time 8.0 h, thawing temperature 15 °C, p -TsOH concentration 60%, pretreatment temperature 70 °C, and time 20 min. Lower acid concentrations and temperatures were used compared with traditional p -TsOH pretreatment. The efficiency and selectivity of lignin separation were improved. It was attributed to freeze-thawing, which provided a more efficient physical channel for the effective penetration of p -TsOH. The separation, extraction and purity of lignin were improved to 89.76%, 78.22% and 77.89%, respectively. High separation, high extraction, high purity and large molecular weight lignin samples were obtained. In addition, the recovery and reuse of p -TsOH was enhanced. This provided a new method for the efficient and clean separation of lignin.
研究领域:
生物化学
·
生物质能
·
环境科学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hemiao Wang,Yurui Wang,Xin Li,Xiaolian Liu,Xin Zheng,Yueqin Shi,Minxuan Xu,Jian Zhang,Qi Zhang
The insertion of a graphene interlayer between van der Waals (vdW) materials could suppress the interlayer recombination to improve interface quality and facilitate charge transport. However, its effect on photovoltaic-mode detectors has rarely been explored. Here, self-powered photodetectors based on WSe 2 /graphene/SnS 2 vdW heterojunctions were assembled and the impact of adding graphene interlayer on its performance was investigated. The p-g-n heterostructure exhibits a photovoltaic characteristic, V OC = 0.13 V and I SC = 0.12 nA under illumination of 2.98 mW/cm 2 @405 nm, lower than that of a control (WSe 2 /SnS 2 ) counterpart ( V OC = 0.19 V and I SC = 1.15 nA). Yet an FF value up to 48.16 % was obtained under an irradiation power density of 0.332 mW/cm 2 @405 nm, which is visibly higher than that of bare WSe 2 /SnS 2 vdW heterostructure . The insertion of graphene interlayer is deemed to reduce the charge traps between vdW materials that are caused by the large concentration difference of majority carriers. However, in case of vdW heterostructure, the subsequently increased leakage current makes the junction less ideal. Thereby interface engineering methods should be used with caution to tune vdW heterostructures on the nanoscale .
研究领域:
材料科学
·
光电子学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Wensha Niu,Zuoyi Xiao,Shifu Wang,Shangru Zhai,Longfei Qin,Zhenyu Zhao,Qingda An,Zhongcheng Li
Electrode materials with excellent capacitance performance remain on urgent need for energy storage devices. In this study, we successfully fabricated porous P-doped carbon-supported NiCoP nanoparticles (NiCoP@P–C) by chelating sodium alginate with Ni 2+ and Co 2+ ions and subsequently performing a high-temperature calcination process. The carbonization process involved phosphating the metal ions to form bimetallic NiCoP nanoparticles and doping the P element into the carbon framework. The as-prepared material integrated the merits of metal phosphide (high theoretical specific capacitance), bimetal (excellent electrochemical conductivity), and porous structure (rapid ion transportation). The sample consequently exhibited outstanding electrochemical properties with an ultrahigh specific capacitance of 920 F g −1 (0.5 A g −1 ) and a high cycle stability of 84% over 5000 cycles with a small mass loading of 3.6 mg cm −2 . Moreover, an asymmetric supercapacitor assembled with NiCoP@P–C-500 as the positive electrode and activated carbon as the negative electrode delivered a maximum energy density of 57.8 W h kg −1 at a power density of 522 W kg −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 26
·期 35
·6371-6379
·
IF 11.382
Wei Zheng,Junhao Lin,Wei Feng,Kai Xiao,Yunfeng Qiu,XiaoShuang Chen,Guangbo Liu,Wenwu Cao,Sokrates T. Pantelides,Wu Zhou,PingAn Hu
2D layered MoS 2 has drawn intense attention for its applications in flexible electronic, optoelectronic, and spintronic devices. Most of the MoS 2 atomic layers grown by conventional chemical vapor deposition techniques are n-type due to the abundant sulfur vacancies. Facile production of MoS 2 atomic layers with p-type behavior, however, remains challenging. Here, a novel one-step growth has been developed to attain p-type MoS 2 layers in large scale by using Mo-containing sol–gel, including 1% tungsten (W). Atomic-resolution electron microscopy characterization reveals that small tungsten oxide clusters are commonly present on the as-grown MoS 2 film due to the incomplete reduction of W precursor at the reaction temperature. These omnipresent small tungsten oxide clusters contribute to the p-type behavior, as verified by density functional theory calculations, while preserving the crystallinity of the MoS 2 atomic layers. The Mo containing sol–gel precursor is compatible with the soft-lithography techniques, which enables patterned growth of p-type MoS 2 atomic layers into regular arrays with different shapes, holding great promise for highly integrated device applications. Furthermore, an atomically thin p–n junction is fabricated by the as-prepared MoS 2 , which shows strong rectifying behavior.
研究领域:
材料科学
·
纳米技术
·
半导体物理
·
电子器件
·
光电子学
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 43
·2403118
·
IF 13
Tianchi Li,Wengui Jiang,Yonghuang Wu,Liang Zhou,Huanyu Ye,Yuchen Geng,Minghui Hu,Kai Liu,Rongming Wang,Yinghui Sun
Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDCs) are extensively employed as channel materials in advanced electronic devices. The electrical contacts between electrodes and 2D semiconductors play a crucial role in the development of high-performance transistors. While numerous strategies for electrode interface engineering have been proposed to enhance the performance of n-type 2D transistors, upgrading p-type ones in a similar manner remains a challenge. In this work, significant improvements in a p-type WSe 2 transistor are demonstrated by utilizing metallic MoO 2 nanosheets as the electrode contact, which are controllably fabricated through physical vapor deposition and subsequent annealing. The MoO 2 nanosheets exhibit an exceptional electrical conductivity of 8.4 × 10 4 S m ‒1 and a breakdown current density of 3.3 × 10 6 A cm ‒2 . The work function of MoO 2 nanosheets is determined to be ≈5.1 eV, making them suitable for contacting p-type 2D semiconductors. Employing MoO 2 nanosheets as the electrode contact in WSe 2 transistors results in a notable increase in the field-effect mobility to 92.0 cm 2 V ‒1 s ‒1 , which is one order of magnitude higher than the counterpart devices with conventional electrodes. This study not only introduces an intriguing 2D metal oxide to improve the electrical contact in p-type 2D transistors, but also offers an effective approach to fabricating all-2D devices.
研究领域:
材料科学
·
纳米电子学
·
半导体器件
·
薄膜制备
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DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 9
·5667-5673
·
IF 3.9
Bin Li,Haibo Qin,Ming Ma,Xiaojia Xu,Mengjing Zhou,Wenrui Hao,Zhigang Hu
In this paper, betaine (Bet) was used as a hydrogen bond acceptor (HBA), and acrylic acid (AA) and acrylamide (AM) were used as hydrogen bond donors (HBD) and mixed to form a deep eutectic solvent (DES). Different concentrations of β-cyclodextrin (β-CD) were dispersed in the DES, and a novel β-CD/P(AA-co-AM) hydrogel was prepared by frontal polymerization (FP). The characteristic structure and morphology of the hydrogels were analyzed using Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), and the properties of the hydrogels were investigated. The results show that the mechanical properties of the hydrogel were improved by β-CD acting as a second cross-linking agent in the polymerization process, thus increasing the cross-link density of the hydrogel. Because the carboxyl groups contained in the acrylic acid dissociate under alkaline conditions, the composite hydrogel shows excellent pH responsiveness under alkaline conditions. Tetracycline hydrochloride was used as a drug model to test the drug loading and drug release performance of the hydrogels. With the increase of β-CD content, the loading capacity of the hydrogels for tetracycline hydrochloride gradually increased. The data of drug release indicated that the hydrogel has good drug delivery performance and has promising applications in drug delivery systems and other areas.
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 3
·653
·
IF 5
Hai Zhu,Tong-Mou Geng,Kai-Bin Tang
Nitrophenols are important nitroaromatic compounds, both important environmental pollutants and dangerous explosives, posing a devastating danger and pollution threat to humans. It is vital to detect efficiently trace nitrophenols in the environment. In this contribution, a series of fully flexible cyclotriphosphazene-based COFs (FFCP COFs: HDADE, HBAPB, and HBPDA), prepared with both a flexible knot and flexible linkers of different lengths, were used for sensing 2,4,6-trinitrophenol (TNP) andp-nitrophenol (p-NP) in real time with excellent sensitivity and selectivity. The quenching constants of HDADE by TNP, HBAPB, and HBPDA byp-NP are 6.29 × 104, 2.17 × 105, and 2.48 × 105L·mol–1, respectively. The LODs of TNP andp-NP are 1.19 × 10−11, 6.91 × 10−12, and 6.05 × 10−12mol·L−1. Their sensitivities increase with the linker length, which is better than the corresponding COFs composed of rigid linkers. There is only a photoinduced electron transfer mechanism in the fluorescence quenching of HBPDA byp-NP. Meanwhile, the mechanisms of photoinduced charge transfer and resonance energy transfer exist in the fluorescence quenching of HDADE by TNP and the fluorescence quenching of HBAPB byp-NP.Keywords:covalent organic frameworks;flexible;fluorescent sense;4-nitrophenol;2,4,6-trinitrophenol
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产品关联
DOI
PubMed
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2022
·
IF 4.264
Zhangcheng Gao,Jianqing Wang,Lianfang Feng,Xueping Gu,Jintang Duan,Cailiang Zhang
Under the conditions specified in this work, the polycondensation reaction to prepare rigid rodlike poly(p-phenylene-cis-benzobisoxazole) (PBO) is diffusion-controlled. This work aims to study the flow-driven polycondensation reaction of PBO. The effect of mixing efficiency through changing the stirring speed on the polycondensation reaction of PBO was first investigated in a paddle impeller reactor (PIR). In the initial stage of polymerization, the increase of stirring speed is obviously conducive to accelerating the polycondensation reaction. However, the promoting effect of stirring speed on the polycondensation reaction is greatly reduced in the middle and late stages of polymerization. The effect of the flow pattern with different proportions of shear flow, elongational flow and rotational flow on the polycondensation reaction of PBO was further investigated by comparing three reactors including Couette-Taylor reactor (CTR) with a complete shear flow, PIR with strong shear and elongational flows, and double helical ribbon reactor (DHR) with strong shear and rotational flows. Result shows that the improvement of proportions of rotational flow and elongational flow is beneficial to accelerate the polycondensation reaction of PBO in the middle and late stages of polymerization, especially for the rotational flow.
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Xinhe Liu,Yong Kang,Yi Wang
In this work, novel visible-light responsive β-Bi 2 O 3 /Ag 2 WO 4 p-n heterojunction photocatalysts were prepared by a simple in situ deposition method and characterized using XRD, FT-IR, SEM, TEM, XPS, UV–vis and PL. The uniform deposition of Ag 2 WO 4 particles on β-Bi 2 O 3 flakes to form heterojunctions, exhibited excellent photocatalytic activity for the degradation of methylene blue (MB) under visible light in 30 min. Compared with pure β-Bi 2 O 3 and Ag 2 WO 4 samples, the kinetic reaction rate constant of MB degradation by β-Bi 2 O 3 /Ag 2 WO 4 was 48.47 times higher than that of β-Bi 2 O 3 , and the degradation rate was as high as 98.8% with good cycling stability.
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Chao-Hua Xue,Ren-Xuan Wei,Xiao-Jing Guo,Bing-Ying Liu,Mi-Mi Du,Meng-Chen Huang,Hui-Gui Li,Shun-Tian Jia
Daytime radiative cooling that cools down an object by reflecting solar light and radiating heat simultaneously is expected to be a promising technology for dissipating heat without any energy consumption. However, radiative cooling materials’ solar reflection and infrared emissivity will be affected by the rain or dust pollution, therefore reducing the cooling performance under outdoor environments. A superhydrophobic radiative cooling composite film with hydrophobic SiO 2 embedded in poly(vinylidene fluoride-co-hexafluoropropene) was proposed via phase separation technology. The SiO 2 particles not only imparted to the film porous micro-nano tier rough structure to enhance the surface hydrophobicity , but also improved the mid-infrared emissivity of the film. As a consequence, the as-prepared film achieved 10.3 °C cooling under direct sunlight with convective heat reduced by transparent polyethylene film, and excellent superhydrophobicity with water contact angle greater than 160° and sliding angle close to 0°. Moreover, the cooling performance and superhydrophobicity of the film changed little after immersion in different pH solution and long-time exposure to UV irradiation. Importantly, the obtained film demonstrated great self-cleaning property making it hardly to be contaminated in outdoor environments, which is significant for sustainable applications.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）