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A transparent, conducting tape for flexible electronics

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Nano Research 2016年第4期9卷 917-924页

作者： Ya Huang Suiyang Liao Jie Ren Bilal Khalid Hailin Peng Hui Wu State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Center for Nanochemistry Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Transparent electrodes are essential components for optoelectronic devices such as displays and thin-film solar cells. Traditionally, the deposition of transparent conducting layers and the sealing of the device are separate steps. Here we report on a highly transparent, conductive, and flexible ＂tape＂, which can be obtained by transferring silver nanowire networks to conventional transparent tape. We utilized the viscidity of the tape to reduce the junction resistance between silver nanowires and further protect the nanowires from corrosion, oxidation and mechanical damage. By this simple method, we obtained a flexible tape with high transparency （-90% at 550 nm wavelength） and low sheet resistance （approaching 22 Ω.sq^-1）. The transparent tape can be attached and stuck firmly on complex surfaces, making the surface highly conductive. We demonstrated the use of the tape as both a conducting layer and a sealing layer for flexible electronics applications including in-situ temperature monitoring and electrochromic devices.

关键词： transparent electrode silver nanowires tape flexible electronics

Stable one dimensional(1D)/three dimensional(3D)perovskite solar cell with an efficiency exceeding 23%

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InfoMat 2022年第5期4卷 187-195页

作者： Qinghua Chen Kaimo Deng Ying Shen Liang Li School of Physical Science and Technology Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhouP.R.China

The interface properties of organic–inorganic mixed halide perovskite solar cells play a significant role in their photovoltaic *** states at the interface can decrease the power conversion efficiency through defect-assisted charge recombination and degrade the long-term ***-dimensional perovskites exhibit excellent *** can be combined with three dimensional(3D)perovskites to utilize their advantages for fabrication of highperformance *** this study,we successfully construct a robust interface for perovskite films through mixed-dimensional *** the introduction of a one dimensional(1D)-structured capping layer on the 3D perovskite through post-treatment,the number of defect states in the perovskite film is significantly decreased,while the lifetime of the photocarriers is *** addition,the 1D capping layer can serve as a diffusion barrier to reduce the ion migration and protect the vulnerable 3D perovskite against *** solar cells based on stacked 1D/3D structures exhibit a power conversion efficiency of 23.3%and maintain 80%of the initial efficiency after storage for over 800 h under ambient conditions with a humidity of 50%.Their performances are superior to those of the 3D *** study provides a simple approach to simultaneously enhance the efficiency and stability of perovskite solar cells and may guide the development of other solar cells.

关键词： interface passivation ion migration perovskite solar cells stability

Atomic-Ordering-Induced Quantum Phase Transition between Topological Crystalline Insulator and Z_2 Topological Insulator

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Chinese Physics Letters 2018年第5期35卷 104-109页

作者： Hui-Xiong Deng Zhi-Gang Song Shu-Shen Li Su-Huai Wei Jun-Wei Luo State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 University of Chinese Academy of Sciences Beijing 100049 Beijing Academy of Quantum Information Sciences Beijing 100193 Beijing Computational Science Research Center Beijing 100094

Topological phase transition in a single material usually refers to transitions between a trivial band insulator and a topological Dirac phase, and the transition may also occur between different classes of topological Dirac *** is a fundamental challenge to realize quantum transition between Z_2 nontrivial topological insulator（TI） and topological crystalline insulator（TCI） in one material because Z_2 TI and TCI have different requirements on the number of band inversions. The Z_2 TIs must have an odd number of band inversions over all the time-reversal invariant momenta, whereas the newly discovered TCIs, as a distinct class of the topological Dirac materials protected by the underlying crystalline symmetry, owns an even number of band inversions. Taking PbSnTe_2 alloy as an example, here we demonstrate that the atomic-ordering is an effective way to tune the symmetry of the alloy so that we can electrically switch between TCI phase and Z_2 TI phase in a single material. Our results suggest that the atomic-ordering provides a new platform towards the realization of reversibly switching between different topological phases to explore novel applications.

关键词： Cu Te Sn TCI Atomic-Ordering-Induced Quantum Phase Transition between Topological Crystalline Insulator and Z2 Topological Insulator Pb Pt

Supported ionic liquid phase-boosted highly active and durable electrocatalysts towards hydrogen evolution reaction in acidic electrolyte

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Journal of Energy Chemistry 2021年第3期30卷 342-351页

作者： Qiyou Wang Yang Gao Zhongyun Ma Yan Zhang Wenpeng Ni Hussein AYounus Ce Zhang Zhengjian Chen Shiguo Zhang College of Materials Science and Engineering Hunan UniversityChangsha 410082China Department of Chemistry Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationXiangtan UniversityXiangtan 411105HunanChina Qian Xuesen Laboratory of Space Technology China Academy of Space Technology(CAST)Beijing 100094China Zhuhai Institute of Advanced Technology Chinese Academy of Sciences Biomaterials Research CenterZhuhai 519003GuangdongChina Chemistry Department Faculty of ScienceFayoum UniversityFayoum 63514Egypt

Platinum is generally known as the most effective electrocatalyst for hydrogen evolution reaction because it can greatly lower the overpotential and accelerate the reaction kinetics,while its commercial potential always suffers from scarcity,high cost,low utilization,and poor durability particularly in acidic *** herein demonstrate a facile method to improve the hydrogen evolution performance of Pt-based electrocatalysts by simply decorating the-state-of-the-art and commercially available Pt/C with hydrophobic protic([DBU][NTf2])or aprotic([BMIm][NTf2])ionic *** current densities of[BMIm]@Pt/C and[DBU-H]@Pt/C with 10% ionic liquid at an overpotential of 40 mV are 2.81 and 4.15 times,respectively,higher than that of the pristine Pt/*** importantly,ionic liquid-decoration significantly improves the long-term stability of Pt *** 8 h of chronoamperometric measurements,[DBU-H]@Pt/C and[BMIm]@Pt/C can still retain 83.7% and 78.3% of their original activity,respectively,which is much higher than that of the pristine Pt/C(24.4%).The improved performance of Pt/C decorated with ionic liquid is considered to arise from the improved proton conductivity(particularly for protic ionic liquid)and hydrophobic microenvironment created by the supported ionic liquid *** presence of ionic liquid layer not only de-coordinates H+from hydronium ions nearby the Pt nanoparticles,but it also protects Pt nanoparticles from dissolution in the acidic media.

关键词： Pt/C Hydrophobic Protic Interface engineering Proton conductivity

Ternary non-noble metal zinc-nickel-cobalt carbonate hydroxide cocatalysts toward highly efficient photoelectrochemical water splitting

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Journal of Materials Science & Technology 2018年第6期34卷 899-904页

作者： Fengren Cao Wei Tian Liang Li College of Physics Optoelectronics and Energy Center for Energy Conversion Materials & Physics (CECMP) Jiangsu Key Laboratory of Thin Films Soochow University

TiO2 photoanodes have aroused intensive research interest in photoelectrochemical （PEC） water splitting. However, they still suffer from poor electron-hole separation and sluggish oxygen evolution dynamics, leading to the low photoconversion efficiency and limiting commercial application. Here, we designed and fabricated novel ternary non-noble metal carbonate hydroxide （ZNC-CH） nanosheet cocatalysts and integrated them with TiO2 nanorod arrays as highly efficient photoanodes of PEC cells. Compared with the pristine TiO2, the photocurrent of photoanode with the optimal amount of ZNC-CH represents 3.2 times enhancement, and the onset potential is shifted toward the negative potential direction of 62 mV, The remarkable enhancement is attributed to the suppressed carrier recombination and enhanced charge transfer efficiency at the interface of TiO2, ZNC-CH and electrolyte, which is closely related to the zinc elements modulated intrinsic activity of catalysts. Our results demonstrate that the introduction of multimetallic ZNC-CH cocatalysts onto photoanodes is a promising strategy to improve the PEC efficiency.

关键词： Photoelectrochemical cells TiO2 Cocatalysts Carbonate hydroxides Photoanodes

High-performance UV-vis photodetectors based on electrospun ZnO nanofiber-solution processed perovskite hybrid structures

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Nano Research 2017年第7期10卷 2244-2256页

作者： Fengren Cao Wei Tian Bangkai Gu Yulong Ma Hao Lu Liang Li College of Physics Optoelectronics and Energy Collaborative Innovation Center of Suzhou Nano Science and Technology Jiangsu Key Laboratory of Thin Films Center for Energy Conversion Materials & Physics (CECMP) Soochow University Suzhou 215006 China

Hybrid organic-inorganic perovskites have been demonstrated as promising candidates for broadband-responsive photodetectors. It is critical to develop perovskite-based photodetectors with excellent photodetection capability and facile fabrication processes for practical application. Herein, we designed and fabricated, for the first time, a hybrid photodetector consisting of electrospun ZnO nanofibers and perovskites. Compared to pristine ZnO or perovskite, the hybrid photodetector showed increased on-off ratio, faster response speed, and higher responsivity and detectivity. The performance of the hybrid devices was significantly enhanced by using quasi-aligned ZnO nanofiber arrays instead of disordered nanofibers, which provide efficient charge transfer between the perovskite and ZnO, shorter transmission paths, and reduced carrier loss at cross-junctions of nanofibers. Our results provide a new and promising route to integrate inorganic functional materials with perovskite for high-performance and low-cost photodetectors.

关键词： ZnO perovskite hybrid electrospinning photodetector

Low-Temperature and Surfactant-Free Synthesis of Mesoporous TiO_2 Sub-Micron Spheres for Efficient Dye-Sensitized Solar Cells

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Journal of Materials Science & Technology 2016年第1期32卷 17-23页

作者： Kaimo Deng Liang Li College of Physics Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University

Dye-sensitized solar cells （DSSCs） are one of the most promising next-generation solar cells due to their advantages over other counterparts. The photoanode of DSSCs has a great effect on the photovoltaic per- formance. Traditional photoanode includes a bottom nanoparticle layer and an upper scattering layer for better light capture in longer wavelength. Mesoporous nanostructures with size comparable to the wavelength of visible light are considered to be excellent light scattering centers by providing extra places for dye loading. Developing a green synthetic method is of great importance. Herein we report a facile and surfactant-free synthesis of mesoporous futile TiO2 submicrometer-sized spheres at temperature as low as 70 ℃. DSSCs based on photoanodes with an upper scattering layer composed of as-obtained mesoporous spheres on nanoparticle dense layer demonstrate an 18.0% improvement of power conver- sion efficiency. This simple approach may offer an energy-efficient and environmentally friendly alternative for DSSCs fabrication.

关键词： Titanium dioxide Mesoporous Sub-micron Light scattering Dye-sensitized solar cells Energy harvesting

Three-dimensional,isotropic imaging of mouse brain using multi-view deconvolution light sheet microscopy

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Journal of Innovative Optical Health Sciences 2017年第5期10卷 94-100页

作者： Sa Liu Jun Nie Yusha Li Tingting Yu Dan Zhu Peng Fei School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 P.R.China Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 P.R.China

We present a threedimensional(3D)isotropic imaging of mouse brain using light-sheet fuo-rescent microscopy(LSFM)in conjumction with a multi-view imaging *** common single view LSFM is used for mouse brain imaging,the brain tissue is 3D imaged under eight views in our study,by a home-built selective plane ilumination microscopy(SPIM).An output image containing complete structural infornation as well as significantly improved res olution(~4 times)are then computed based on these eight views of data,using a bead-guided multi-view registration and *** superior imaging quality,the astrocyte and pyrarmidal neurons together with their subcellular nerve fbers can be clearly visualized and *** further incuding other computational methods,this study can be potentially scaled up to map the conectome of whole mouse brain with a simple *** microscope.

关键词： Light sheet fuorescent microscopy multi-view dconvolution mouse brain imaging isotropic

Advances in Sn-Based Catalysts for Electrochemical CO_(2) Reduction

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Nano-Micro Letters 2019年第4期11卷 114-132页

作者： Shulin Zhao Sheng Li Tao Guo Shuaishuai Zhang Jing Wang Yuping Wu Yuhui Chen State Key Laboratory of Materials-oriented Chemical Engineering School of Energy Science and EngineeringNanjing Tech UniversityNanjing 211816JiangsuPeople’s Republic of China

The increasing concentration of CO2 in the atmosphere has led to the greenhouse effect,which greatly affects the climate and the ecological balance of ***,converting CO2 into renewable fuels via clean and economical chemical processes has become a great concern for *** CO2 conversion is a prospective path toward carbon *** the different electrocatalysts,Sn-based electrocatalysts have been demonstrated as promising catalysts for CO2 electroreduction,producing formate and CO,which are important industrial *** this review,various Sn-based electrocatalysts are comprehensively summarized in terms of synthesis,catalytic performance,and reaction mechanisms for CO2 ***,we concisely discuss the current challenges and opportunities of Sn-based electrocatalysts.

关键词： Greenhouse effect CO_(2) electrochemical reduction Sn-based electrocatalysts