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分子辅助制备富含高价态Co^(3+)的三维蜂窝状钴硫化物网络结构用于高性能固态不对称超级电容器

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Science China Materials 2021年第4期64卷 840-851页

作者：王海燕杨瑛李擎昊陆雯宁吉强钟依均张子旸胡勇 Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Department of ChemistryZhejiang Normal UniversityJinhua 321004China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

过渡金属氧化态调控工程是一种很有前景的改善电极材料的氧化还原活性、增加活性位点的策略.本文提出了一种简单的三乙醇胺辅助自模板法,制备了一种由交错钴硫化物纳米片(Co_(x)S_(y)-T NSs)组装而成的独特的三维蜂窝状网络结构.有趣的... 详细信息

过渡金属氧化态调控工程是一种很有前景的改善电极材料的氧化还原活性、增加活性位点的策略.本文提出了一种简单的三乙醇胺辅助自模板法,制备了一种由交错钴硫化物纳米片(Co_(x)S_(y)-T NSs)组装而成的独特的三维蜂窝状网络结构.有趣的是,我们首次发现在该体系中,三乙醇胺可以有效地增加目标产物中的高价态Co^(3+)的比例.Co_(x)S_(y)-T NSs电极具有高含量的Co^(3+)和三维网络结构,使得其在5 A g^(-1)的电流密度下表现出351 mA h g^(-1)(2635 F g^(-1))的最大比容量和优异的循环稳定性.此外,由Co_(x)S_(y)-T NSs和活性炭(AC)电极组装的固态不对称超级电容器在0.81 kW kg^(-1)功率密度下展现出81.62 W h kg^(-1)的高能量密度和卓越的长周期循环稳定性,7000次循环后仍有96.2%的容量保持率.该结果证明同时调控高价态的金属物种并构筑三维网络结构是一种简单而有效的制备用于能源存储与转换的高活性电极材料的策略.

关键词：三维网络结构氧化还原活性循环稳定性蜂窝状三乙醇胺高能量密度自模板法高价态

New types of hybrid electrolytes for supercapacitors

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Journal of Energy Chemistry 2021年第6期30卷 219-232,I0006页

作者： Wuquan Ye Haiyan Wang Jiqiang Ning Yijun Zhong Yong Hu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Department of ChemistryZhejiang Normal UniversityJinhua 321004ZhejiangChina Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina

Supercapacitors(SCs)are emerging as efficient energy storage devices but still suffering from limited energy density compared with batteries.Electrolytes have been regarded as the key to determine the energy storage performance of SCs.However,none of the conventional electrolytes can fully meet the increasing requirements of SCs in terms of high ion conductivity,excellent stability,wide voltage window and operating temperature range,as well as environmentally friend concerns.To this end,hybrid electrolytes have sprung up in recent years,which are believed to be the candidate to solve these shortcomings.Herein,the state-of-the-art types of hybrid electrolytes for SCs,including the combination of aqueous and organic,aqueous and gel polymer,ionic liquids(ILs)and organic,and ILs and gel polymer hybrid electrolytes,are reviewed.The effects of different hybrid systems on the performance of SCs and the underlying mechanisms are among the focal points of the review,and prospects and possible directions are discussed as well to provide further insight into the future development of this field.

关键词： Supercapacitors Hybrid electrolytes Energy density Power density Wide voltage window

High-performance solar-blind photodetector arrays constructed from Sn-doped Ga_(2)O_(3)microwires via patterned electrodes

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Nano Research 2022年第8期15卷 7631-7638页

作者： Ya-Cong Lu Zhen-Feng Zhang Xun Yang Gao-Hang He Chao-Nan Lin Xue-Xia Chen Jin-Hao ZangWen-Bo Zhao Yan-Cheng Chen Lei-Lei Zhang Yi-Zhe Li Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Material and Devices Key Laboratory of Material physicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China

Ga_(2)O_(3)has been regarded as a promising material for solar-blind detection due to its ultrawide bandgap and low growth cost.Although semiconductor microwires(MWs)possess unique optical and electronic characteristics,the performances of photodetectors developed from Ga_(2)O_(3)MWs are still less than satisfactory.Herein,we demonstrate high-performance solar-blind photodetectors based on Sn-doped Ga_(2)O_(3)MWs,possessing a light/dark current ratio of 107 and a responsivity of 2,409 A/W at 40 V.Moreover,a 1×10 solar-blind photodetector linear array is developed based on the Sn-doped Ga_(2)O_(3)MWs via a patternedelectrodes method.And clear solar-blind images are obtained by using the photodetector array as the imaging unit of a solarblind imaging system.The results provide a convenient way to construct high-performance solar-blind photodetector arrays based on Ga_(2)O_(3)MWs,and thus may push forward their future applications.

关键词： Sn-doped Ga_(2)O_(3) microwires photodetector linear array solar-blind imaging

Nonlinear photoresponse of metallic graphene-like VSe2 ultrathin nanosheets for pulse laser generation

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Science China(Information Sciences) 2019年第12期62卷 141-148页

作者： Tao WANG Xinyao SHI Jin WANG Yijun XU Jie CHEN Zhuo DONG Man JIANG Pengfei MA Rongtao SU Yanxing MA Jian WU Kai ZHANG Pu ZHOU College of Advanced Interdisciplinary Studies National University of Defense Technology i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences

Vanadium diselenide(VSe2), a typical metallic behaviour material among transition metal dichalcogenides(TMDCs) family, exhibits excellent photoelectric characteristics with a zero band gap, missing applicaiotn in pulse generation. In this work, a high-quality VSe2 saturable absorber(SA) was synthesized through a liquid-phase exfoliation method. The saturable absorption of obtained VSe2-SA was characterized systematically. The measured modulation depth was 9.9%, and the saturated intensity was 533.8 μJ/cm2. By incorporating this optical modulator into a ytterbium-doped fiber laser cavity, a stable passively Q-switched laser could be achieved. The pulse had the central wavelength of 1064.03 nm. As the pump power was increased, the repetition rate increased from 24.3 k Hz to 35.6 k Hz, and the pulse duration decreased from7.21 μs to 5.27 μs. The output power had the maximum value of 28.55 m W. These results indicated that VSe2 is an effective candidate to generate pulse laser due to its excellent nonlinear optical properties and universal photoelectric response, which may advance the applications of VSe2-based nonlinear optics and photoelectric devices.

关键词： transition metal dichalcogenides VSe2 saturable absorber pulse laser fiber laser

Boosting C–C coupling to multicarbon products via high-pressure CO electroreduction

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Journal of Energy Chemistry 2023年第10期85卷 102-107,I0005页

作者： Wenqiang Yang Huan Liu Yutai Qi Yifan Li Yi Cui Liang Yu Xiaoju Cui Dehui Deng State Key Laboratory of Catalysis Collaborative Innovation Center of Chemistry for Energy MaterialsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina

Electrochemical CO reduction reaction(CORR) provides a promising approach for producing valuable multicarbon products(C_(2+)), while the low solubility of CO in aqueous solution and high energy barrier of C–C coupling as well as the competing hydrogen evolution reaction(HER) largely limit the efficiency for C_(2+)production in CORR. Here we report an overturn on the Faradaic efficiency of CORR from being HER-dominant to C_(2+)formation-dominant over a wide potential window, accompanied by a significant activity enhancement over a Moss-like Cu catalyst via pressuring CO. With the CO pressure rising from 1 to 40 atm, the C_(2+)Faradaic efficiency and partial current density remarkably increase from 22.8%and 18.9 mA cm^(-2)to 89.7% and 116.7 mA cm^(-2), respectively. Experimental and theoretical investigations reveal that high pressure-induced high CO coverage on metallic Cu surface weakens the Cu–C bond via reducing electron transfer from Cu to adsorbed CO and restrains hydrogen adsorption, which significantly facilitates the C–C coupling while suppressing HER on the predominant Cu(111) surface, thereby boosting the CO electroreduction to C_(2+)activity.

关键词： CO electroreduction High pressure electrochemistry Cu catalyst C–C coupling Multicarbon products

Interfacial dynamics of GaP/Si(100) heterostructure grown by molecular beam epitaxy

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Journal of Semiconductors 2022年第12期43卷 32-38页

作者： Tieshi Wei Xuefei Li Zhiyun Li Wenxian Yang Yuanyuan Wu Zhiwei Xing Shulong Lu Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China Vacuum Interconnected Nanotech Workstation(NANO-X) Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

The atomic structure and surface chemistry of GaP/Si(100)heterostructure with different pre-layers grown by molecu-lar beam epitaxy are studied.It is found that GaP epilayer with Ga-riched pre-layers on Si(100)substrate has regular surface mor-phology and stoichiometric abrupt heterointerfaces from atomic force microscopes(AFMs)and spherical aberration-corrected transmission electron microscopes(ACTEMs).The interfacial dynamics of GaP/Si(100)heterostructure is investigated by X-ray photoelectron spectroscopy(XPS)equipped with an Ar gas cluster ion beam,indicating that Ga pre-layers can lower the inter-face formation energy and the bond that is formed is more stable.These results suggest that Ga-riched pre-layers are more con-ducive to the GaP nucleation as well as the epitaxial growth of GaP material on Si(100)substrate.

关键词： XPS interfacial dynamics GaP/Si(100)heterostructure MBE

Experimental evidence of surface copper boride

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Nano Research 2023年第7期16卷 9602-9607页

作者： Xiao-Ji Weng Jie Bai Jingyu Hou Yi Zhu Li Wang Penghui Li Anmin Nie Bo Xu Xiang-Feng Zhou Yongjun Tian Center for High Pressure Science State Key Laboratory of Metastable Materials Science and TechnologySchool of ScienceYanshan UniversityQinhuangdao 066004China Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics Nankai UniversityTianjin 300071China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

To validate the crystal structure and elucidate the formation mechanism of the unexpected surface copper boride,a systematic scanning tunneling microscope,X-ray photoelectron spectroscopy,angle-resolved photoemission spectroscopy,and aberrationcorrected scanning transmission electron microscopy investigations were conducted to confirm the structure of copper-rich boride Cu_(8)B_(14)after depositing boron on single-crystal Cu(111)surface under ultrahigh vacuum.First-principles calculations with defective surface models further indicate that boron atoms tend to react with Cu atoms near terrace edges or defects,which in turn shapes the intermediate structures of copper boride and leads to the formation of stable Cu-B monolayer via large-scale surface reconstruction eventually.

关键词： copper boride surface science ultrahigh vacuum structure characterization first principles formation mechanism

Recent advances in the synthesis of non-carbon two-dimensional electrode materials for the aqueous electrolyte-based supercapacitors

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Chinese Chemical Letters 2021年第12期32卷 3733-3752页

作者： Hongfei Wang Yijun Zhong Jiqiang Ning Yong Hu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Department of ChemistryZhejiang Normal UniversityJinhua 321004China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Supercapacitors(SCs) with high power density and long cycling span life are demanding energy storage devices that will be an attractive power solution to modern electronic and electrical applications. Numerous theoretical and experimental works have been devoted to exploring various possibilities to increase the functionality and the specific capacitance of electrodes for SCs. Non-carbon two-dimensional(2D)materials have been considered as encouraging electrode candidates for their chemical and physical advantages such as tunable surface chemistry, high electronic conductivity, large mechanical strength, more active sites, and dual non-faradaic and faradaic electrochemical performances. Besides, these 2D materials also play particular roles in constructing highway channels for fast ion diffusion. This concise review summarizes cutting-edge progress of some representative 2D non-carbon materials for the aqueous electrolyte-based SCs, including transition metal oxides(TMOs), transition metal hydroxides(TMHs), transition metal chalcogenides(TMCs), MXenes, metal-organic frameworks(MOFs) and some emerging materials. Different synthetic methods, effective structural designs and corresponding electrochemical performances are reviewed in detail. And we finally present a detailed discussion of the current intractable challenges and technical bottlenecks, and highlight future directions and opportunities for the development of next-generation high-performance energy storage devices.

关键词： Supercapacitors 2D non-carbon materials Aqueous electrolyte High power density Long cycling span life

Observation of multiple charge density wave phases in epitaxial monolayer 1T-VSe_(2) film

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Chinese Physics B 2022年第10期31卷 137-145页

作者：宗君宇谢阳孟庆豪田启超陈望谢学栋靳少恩张永衡王利任伟沈健陈爱喜王鹏栋李坊森董召阳王灿李建新张翼 National Laboratory of Solid State Microstructure School of PhysicsNanjing UniversityNanjing 210093China Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

As a special order of electronic correlation induced by spatial modulation, the charge density wave(CDW) phenomena in condensed matters attract enormous research interests. Here, using scanning-tunneling microscopy in various temperatures, we discover a hidden incommensurate stripe-like CDW order besides the(■) CDW phase at low-temperature of 4 K in the epitaxial monolayer 1T-VSe_(2) film. Combining the variable-temperature angle-resolved photoemission spectroscopic(ARPES) measurements, we discover a two-step transition of an anisotropic CDW gap structure that consists of two parts △_(1) and△_(2). The gap part ?1 that closes around ~ 150 K is accompanied with the vanish of the(√7×√3) CDW phase. While another momentum-dependent gap part △_(2) can survive up to ~ 340 K, and is suggested to the result of the incommensurate CDW phase. This two-step transition with anisotropic gap opening and the resulted evolution in ARPES spectra are corroborated by our theoretical calculation based on a phenomenological form for the self-energy containing a two-gap structure △_(1) +△_(2), which suggests different forming mechanisms between the(√7×√3) and the incommensurate CDW phases. Our findings provide significant information and deep understandings on the CDW phases in monolayer 1T-VSe_(2) film as a two-dimensional(2D) material.

关键词： charge density waves VSe_(2) band structures STM ARPES