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Progress in Natural Science:Materials International 2023年第6期33卷 825-832页

作者： Saisai Chen Chaohai Wang Dayong Xu Jiansheng Li school of Chemical and Environmental Engineering Anhui Polytechnic University Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology School of Municipal and Environmental Engineering Henan University of Urban Construction

The design of novel signal amplification elements was key to improving the sensing and analysis performance of electrochemical sensors. In this work, porous one-dimensional copper nitrogen-doped carbon nanofibers(CuNCNFs) were successfully prepared via the coupled process of electrospinning technology and high-temperature pyrolysis. This coupling of multiple processes and the introduction of heteroatoms pyrolyzed the HKUST-1 particles to generate three-dimensional Cu-doped carbon octahedra and mosaic them inside the one-dimensional carbon nitride channels, obtaining small-sized Cu particles while introducing a large number of N species, and constructing a three-dimensional MOFs-derived metal-carbon hybrid one-dimensional multistage carbon nitride structure. The resulting Cu-NCNFs sensor could simultaneously determine acetaminophen and sulfanilamide and exhibit superior electroanalytical performance, reproducibility, stability, and selectivity. This strategy provides a new approach to preparing novel signal amplification elements for the efficient monitoring of micropollutants.

关键词： HKUST-1 Cu/N-doped carbon nanofibers Acetaminophen Sulfanilamide

Improved Goldstein filter for InSAR noise reduction based on local SNR

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Journal of Central South University 2013年第7期20卷 1896-1903页

作者： SUN Qian LI Zhi-wei ZHU Jian-jun DING Xiao-li HU Jun XU Bing school of Geosciences and Info-Physics Central South University Changsha 410083 China Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic University Hong Kong China

Although the modified Goldstein filter based on the local signal-to-noise （SNR） has been proved to be superior to the classical Goldstein and Baran filters with more comprehensive filter parameter, its adaptation is not always sufficient in the reduction of phase noise. In this work, the local SNR-based Goldstein filter is further developed with the improvements in the definition of the local SNR and the adaption of the filtering patch size. What＇s more, for preventing the loss of the phase signal caused by the excessive filtering, an iteration filtering operation is also introduced in this new algorithm. To evaluate the performance of the proposed algorithm, both a simulated digital elevation model （DEM） interferogram and real SAR deformation interferogram spanning the L＇ Aquila earthquake are carried out. The quantitative results from the simulated and real data reveal that up to 79.5% noises can be reduced by the new filter, indicating 9%-32% improvements over the previous local SNR-based Goldstein filter. This demonstrates that the new filter is not only equipped with sufficient adaption, but also can suppress the phase noise without the sacrifice of the phase signal.

关键词： interferometric synthetic aperture radar (InSAR) Goldstein filter signal-to-noise (SNR) adaptivity

Highly sensitive solar-blind deep ultraviolet photodetector based on graphene/PtSe_(2)/β-Ga_(2)O_(3)2D/3D Schottky junction with ultrafast speed

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Nano Research 2021年第6期14卷 1973-1979页

作者： Di Wu Zhihui Zhao Wei Lu Lukas Rogée Longhui Zeng Pei Lin Zhifeng Shi Yongtao Tian Xinjian Li Yuen Hong Tsang school of Physics and Microelectronics and Key Laboratory of Material PhysicsZhengzhou UniversityZhengzhou450052China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

There is an emerging need for high-sensitivity solar-blind deep ultraviolet(DUV)photodetectors with an ultra-fast response *** nanoscale devices based on Ga_(2)O_(3)nanostructures have been developed,their practical applications are greatly limited by their slow response speed as well as low specific ***,the successful fabrication of two-/three-dimensional(2D/3D)graphene(Gr)/PtSe2/β-Ga_(2)O_(3)Schottky junction devices for high-sensitivity solar-blind DUV photodetectors is *** from the high-quality 2D/3D Schottky junction,the vertically stacked structure,and the superior-quality transparent graphene electrode for effective carrier collection,the photodetector is highly sensitive to DUV light illumination and achieves a high responsivity of 76.2 mA/W,a large on/off current ratio of~105,along with an ultra-high ultraviolet(UV)/visible rejection ratio of 1.8×*** importantly,it has an ultra-fast response time of 12µs and a remarkable specific detectivity of~1013 ***,an excellent DUV imaging capability has been identified based on the Gr/PtSe2/β-Ga_(2)O_(3)Schottky junction photodetector,demonstrating its great potential application in DUV imaging systems.

关键词： platinum diselenide β-Ga_(2)O_(3) solar-blind photodetectors deep ultraviolet imaging

Excellent energy storage properties realized in novel BaTiO_(3)-based lead-free ceramics by regulating relaxation behavior

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Journal of Materiomics 2023年第5期9卷 910-919页

作者： Peng-Zu Ge Zhi-Gang Liu Xian-Xiong Huang Xin-Gui Tang Zhen-Hua Tang Shui-Feng Li Qiu-Xiang Liu Yan-Ping Jiang Xiao-Bin Guo school of Physics&Optoelectric Engineering Guangdong University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou510006China Guangzhou Panyu polytechnic Guangzhou511483China

BaTiO_(3)(BT)has attracted extensive attention among advanced lead-free ferroelectric materials due to its unique dielectric and ferroelectric ***,the enormous remanent polarization and coercive field severely impede the improvement of its energy storage ***,the BaTiO_(3)e-Bi(Zn_(0.5)Hf_(0.5))O_(3)(BT-BZH)ceramics with high breakdown field strength and remarkable relaxation characteristics can be obtained by introducing the composite component BZH in BT to regulate the phase structure and grain size of the *** findings demonstrate that the improvement of energy storage performance is related to the increase of relaxation behavior.A large energy storage density(Wrec~3.62 J/cm^(3))along with superior energy storage efficiency(h~88.5%)is achieved in 0.88BT-0.12BZH relaxor ceramics only at 240 kV/*** addition,the sample suggests superior thermal stability and frequency stability within 25e115℃and 1e500 Hz,***,the outstanding chargedischarge properties with an ultrafast discharge time(100 ns),large discharged energy density(1.2 J/cm^(3)),impressive current density(519.4 A/cm^(2))and power density(31.1 MW/cm^(3))under the electric field of 120 kV/cm are achieved in studied *** excellent energy storage performance of BT-BZH ceramics provides a promising platform for the application of lead-free energy-storage materials.

关键词： BT-based ceramics Relaxor Energy storage Charge-discharge

Changes of Mechanical Properties of Lightweight Cement Mortar Mixed with Recycled Expanded Polystyrene and Subjected to High Temperatures

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Changes of Mechanical Properties of Lightweight Cement Morta...

An adaptive image sparse reconstruction method combined with nonlocal similarity and cosparsity for mixed Gaussian-Poisson noise removal

2014 International Conference on Green Materials and Environmental Engineering (GMEE2014)

作者： Rocío Sancho ángel Castillo Ma Eugenia Maciá Rosa Corral polytechnic superior school CEU San Pablo University Spanish national Research Council–CSIC. Eduardo Torroja Institute of Construction

The main aim of this paper is to evaluate the influence of the recycled expanded polystyrene as lightweight aggregate on the mechanical properties of lightweight cement mortar when subjected to high temperatures. Various tests have been carried out on different mixtures of mortar. The water/cement mix proportion has always been the same and only the nature of the aggregates has changed, with a partial replacement of the conventional aggregate by recycled ground EPS（EPS-G） with values ranging from 10% to 30%, achieving significant results in relation to exposure to high temperatures. In this research, the samples have been subjected to different temperatures of exposure, in order to analyze the influence of the lightweight recycled arid dosage in the mechanical properties of mortars. The results of this study show the ability of mechanical response at high temperatures with light mortars EPS-G. This study shows how this new mix can be used in different building types, optimizing construction materials and reducing mortars density while transforming a residual product into an active product.

关键词： Mortar Lightweight aggregates Mechanical properties High temperatures

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Optoelectronics Letters 2018年第1期14卷 57-60页

作者：陈勇翡高红霞吴梓灵康慧 school of Automation Science and Engineering South China University of Technology Guangzhou 510641 China Guangdong polytechnic Normal University Guangzhou 510665 China

Compressed sensing(CS) has achieved great success in single noise removal. However, it cannot restore the images contaminated with mixed noise efficiently. This paper introduces nonlocal similarity and cosparsity inspired by compressed sensing to overcome the difficulties in mixed noise removal, in which nonlocal similarity explores the signal sparsity from similar patches, and cosparsity assumes that the signal is sparse after a possibly redundant transform. Meanwhile, an adaptive scheme is designed to keep the balance between mixed noise removal and detail preservation based on local variance. Finally, IRLSM and RACoSaMP are adopted to solve the objective function. Experimental results demonstrate that the proposed method is superior to conventional CS methods, like K-SVD and state-of-art method nonlocally centralized sparse representation(NCSR), in terms of both visual results and quantitative measures.

关键词： SVD AK An adaptive image sparse reconstruction method combined with nonlocal similarity and cosparsity for mixed Gaussian-Poisson noise removal MSR

High-thermoelectric performance of TiO_(2-x)fabricated under high pressure at high temperatures

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Journal of Materiomics 2017年第4期3卷 286-292页

作者： Haiqiang Liu Hongan Ma Taichao Su Yuewen Zhang Bing Sun Binwu Liu Lingjiao Kong Baomin Liu Xiaopeng Jia State Key Laboratory of Superhard Materials Jilin UniversityChangchun 130012China school of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454000China

We present the work about the initiative fabrication of multi-scale hierarchical TiO2-x by our strategy,combining high pressure and high temperature(HPHT)reactive sintering with appropriate ratio of coarse Ti to nanosized TiO_(2).Ubiquitous lattice defects engineering has also been achieved in our samples by *** thermoelectric performance was significantly enhanced,and rather low thermal conductivity(1.60 W m^(-1)K^(-1))for titanium oxide was reported here for ***,a high dimensionless figure of merit(zT)up to 0.33 at 700℃was realized in *** far as we know,this value is an enhancement of 43%of the ever best result about nonstoichiometric TiO_(2)and the result is also exciting for oxide thermoelectric *** moderate power factor,the significantly reduced thermal conductivity and the remarkable synergy between electrical properties and thermal conductivity are responsible for the excellent thermoelectric *** develop a facile strategy for preparing multi-scale hierarchical TiO_(2-x)and its superior ability to optimize thermoelectric performance has been demonstrated here.

关键词： High pressure High temperature Multi-scale TiO_(2-x) Thermoelectric Integrated phonon scattering

Facile synthesis of nickel cobalt selenide hollow nanospheres as efficient bifunctional electrocatalyst for rechargeable Zn-air battery

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Science China Materials 2020年第3期63卷 347-355页

作者： Xuerong Zheng Jinfeng Zhang Jihui Wang Zhijia Zhang Wenbin Hu Yajing Han school of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of the Ministry of EducationTianjin UniversityTianjin 300072China Department of Chemistry Virginia TechBlacksburgVirginia 24061USA school of Materials Science and Engineering Tianjin Polytechnic UniversityTianjin 300387China

Designing high active,low cost and bifunctional electrocatalysts is urgent for developing clean energy storage and conversion *** metal selenides exhibit optimal electronic conductivity and tunable physicochemical properties,which endow them with potential for efficient electrocatalysts to facilitate the oxygen reduction and oxygen evolution reactions(ORR and OER).Herein,hollow NixCo0.85-xSe nanospheres were synthesized using a facile polyol based solution chemical *** NixCo0.85-xSe exhibits an onset overpotential of 0.89 V for ORR,and an overpotential of 305 mV to achieve 10 mA cm^-2 for ***,the NixCo0.85-xSe based Zn-air battery displays remarkable specific capacity and *** superior catalytic performances can be attributed to the synergistic effect,large specific surface area and enhanced electron transfer *** approach provides a new way to design highly efficient bifunctional electrocatalysts for electrochemical energy storage and utilization.

关键词： transition metal selenides bifunctional electrocatalyst oxygen reduction reaction oxygen evolution reaction rechargeable Zn-air battery

Tin oxide(SnO_2) as effective electron selective layer material in hybrid organic–inorganic metal halide perovskite solar cells

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Journal of Energy Chemistry 2018年第4期27卷 962-970页

作者： Guang Yang Pingli Qin Guojia Fang Gang Li The Hong Kong polytechnic University Shenzhen Research Institute.Shenzhen 518057 GuangdongChina Department of Electronic and Information Engineering The Hong Kong Polytechnic UniversityHong KongChina Key Laboratory of Artificial Micro-and Nano-strctures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina

The emergence of hybrid organic-inorganic metal halide perovskite solar cells （PSCs） causes a break through in the solar technology recently due to its fabrication processes. The dramatic enhancenlent in in 2009 to the recent certified record PCE of 22.7% superior optoelectronic properties and the low-cost power conversion efficiency （PCE） of PSCs flom 3.8% ndicates huge potential of PSCs for future high efficiency and large scale photovoltaic manufacturing. The electron selective layer （ESL） plays an important role in electron extraction and hole blocking function in PSCs, and there have been great interest in developing efficient ESL materials. Recently, tin oxide （SnO2） as an ESL has attracted significant research attentions owing to its low temperature preparation processes as well as yielding high PCE and good stability of PSCs. In this perspective article, we focus on the development progress of SnO2 as an ESL m PSCs, and discuss the strategies for preparing SnO2 to achieve PSCs with high efficiency, less hysteresis and good device stability.

关键词： Tin oxide Electron selective layers Perovskite solar cells Low temperature preparation

Rational construction of cross-linked porous nickel arrays for efficient oxygen evolution reaction

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Chinese Journal of Catalysis 2019年第7期40卷 1063-1069页

作者： Kaili Zhang Shengjue Deng Yu Zhong Yadong Wang Jianbo Wu Xiuli Wang Xinhui Xia Jiangping Tu State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Provinceand School of MaterialsScience and EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina school of Engineering Nanyang Polytechnic569830Singapore Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou UniversityTaizhou 318000ZhejiangChina

It is important but challenging to design and fabricate an efficient and cost-effective electrocatalyst for the oxygen evolution reaction(OER). Herein, we report free-standing 3 D nickel arrays with a cross-linked porous structure as interesting and high-performance electrocatalysts for OER via a facile one-step electrodeposition method. The 3 D nickel arrays are strongly anchored on the substrate, forming self-supported electrocatalysts with reinforced structural stability and high electrical conductivity. Because of their increased active surface area, abundant channels for electron/ion transportation and enhanced electronic conductivity, the designed 3 D nickel arrays exhibit superior electrocatalytic OER performance with a low overpotential(496 mV at 50 mA cm–2) and a small Tafel slope(43 mV dec–1) as well as long-term stability(no decay after 24 h) in alkaline solution. Our proposed rational design strategy may open up a new way to construct other advanced 3 D porous materials for widespread application in electrocatalysis.

关键词： Oxygen evolution reaction Nickel arrays Electrocatalysis Porous structure Electrodeposition