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Journal of Energy Chemistry 2018年第2期27卷 591-599页

作者： Min Wei Qingsong Huang Yanping Zhou Zhu Peng Wei Chu School of Chemical Engineering Sichuan University School of Electronics and Information Engineering Sichuan University

A homogeneous better-dispersed ultrathin nanosheets（ca. 5 nm） of cobalt-nickel layered double hydroxides（LDH） supported on nickel foam scaffold was synthesized using controllable electrodeposition approach for high efficiency electrode materials of new supercapacitor. The morphology and electrochemical performances of the samples can be controlled by adjusting the precursor ratio, i.e., Ni（OAc）2/Co（NO3）2 molar ratio in the electrodeposition approach. With the increase of this molar ratio, the electrochemical performances give a volcano trend. When the optimized molar ratio is 0.64/0.36, the hybrid delivered a high specific capacitance of 1587.5 F g-1 at a current density of 0.5 A g-1, with good rate capability（1155 F g-1 was retained even at 10 A g-1） and a robust recycle stability（remaining 91.5% after 1000 cycles at 5 A g-1）. The good performance could be attributed to the enlarged interlayer spacing, ultrathin nanosheets and synergistic effects between Co（OH）2 and Ni（OH）2. Furthermore, an asymmetric supercapacitor with a high energy density of 34.5 Wh kg-1 at 425 W kg-1 and excellent cycling stability of 85.4% after 5000 charge-discharge cycles at 2 A g-1 was fabricated. We believe that this fantabulous new electrode material would have encouraging applications in electrochemical energy storage and a wide readership.

关键词： ultrathin nanosheets CoNi layered double hydroxides (LDH) electrode Ni(OAc)2/Co(NO3)2 precursors High performance Electrodeposition Asymmetric supercapacitor

In situ decomposition of metal-organic frameworks into ultrathin nanosheets for the oxygen evolution reaction

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Nano Research 2016年第6期9卷 1856-1865页

作者： Kai He Zhen Cao Ruirui Liu Ya Miao Yi Ding Key Laboratory of Colloid and Interface Chemistry of State Education Ministry School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China Tianjin Key Laboratory of Advanced Functional Porous Materials School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China

The oxygen evolution reaction （OER） is a pivotal process for water-splitting and many other energy technologies involving oxygen electrodes. Herein, a new synthesis strategy is proposed to prepare OER catalysts based on a simple yet flexible in situ decomposition of Co-based acetate hydroxide metal-organic frameworks （MOFs）. This process allows straightforward fabrication of various 2D hydroxide ultrathin nanosheets （UNSs） with excellent component controllability. The as-obtained Co-based hydroxide UNSs demonstrate superior catalytic activity for the OER due to the exposure of numerous active sites. In particular, the CoNi hydroxide UNSs exhibit low overpotentials （r/） of 324 and 372 mV at current densities of 10 and 100 mA-cm-2, respectively; a large turnover frequency （TOF） of 0.16 s-~ at T/= 380 mV; and a small Tafel slope of 33 ***-~ in an alkaline environment. Importantly, these values are superior to those of the state-of-the- art IrO2 commercial electrocatalyst. This facile strategy enables the exploration of more efficient and economic OER electrocatalysts with various constituents and opens a promising avenue for large-scale fabrication of functional nanocatalysts for use in clean ener~：v technologies.

关键词： oxygen evolution reaction metal-organic frameworks(MOFs) in situ decomposition ultrathin nanosheets electrocatalyst

Superhydrophilic nickel hydroxide ultrathin nanosheets enable high-performance asymmetric supercapacitors

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Rare Metals 2024年第1期43卷 138-147页

作者： Yi-Ran Wang Fei Zhang Jian-Min Gu Xiao-Yu Zhao Ran Zhao Xing Wang Tian-Hui Wu Jing Wang Ji-Dong Wang De-Song Wang State Key Laboratory of Metastable Materials Science and Technology(MMST) Hebei Key Laboratory of Applied ChemistryYanshan UniversityQinhuangdao 066004China Department of Food and Pharmaceutical Engineering Suihua UniversitySuihua 152000China School of Chemical Science and Engineering Tongji UniversityShanghai 200092China School of Sciences Hebei University of Science and TechnologyShijiazhuang 050018China

Superhydrophilic surfaces have been applied for supercapacitor;however,during energy storage reaction,how the wettability affects the process of electrochemical reaction specifically is still ***,we demonstrate superhydrophilic surface for promotion of electrochemical reactions by liquid affinity and further explain the mechanism,where the transition of the wettability state caused by the change in surface free energy is the main reason for the obvious increase in specific *** citric acid assistance strategy,an intrinsically hydrophobic Ni(OH)_(2)thick nanosheets(HNHTNs,16 nm)can be transitioned into superhydrophilic Ni(OH)_(2)ultrathin nanosheets(SNHUNs,6.8 nm),where the water contact angle was 0°and the surface free energy increased from 8.6to 65.8 mN·m^(-1),implying *** with HNHTNs,the specific capacitance of SNHUNs is doubled:from 1230 F·g^(-1)(HNHTNs)to 2350 F·g^(-1)(2A·g^(-1))and,even at 20 A·g^(-1),from 833 F·g^(-1)(HNHTNs)to 1670 F·g^(-1).The asymmetric capacitors assembled by SNHUNs and activated carbon show 52.44 Wh·kg^(-1)at 160W·kg^(-1)and excellent stability with~90%retention after5000 cycles(~80%retention after 9500 cycles).The promotion of electrochemical performances is ascribed to the change of surface wettability caused by surface free energy,which greatly increase affinity of electrode to the surrounding liquid environment to reduce the interface resistance and optimize the electron transport path.

关键词： Asymmetric supercapacitor Superhydrophilic interface Transition metal hydroxides ultrathin nanosheets High specific capacitance

Stable metallic 1T-WS2 ultrathin nanosheets as a promising agent for near-infrared photothermal ablation cancer therapy

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Nano Research 2015年第12期8卷 3982-3991页

作者： Qin Liu Chunyang Sun Qun He Adnan Khalil Ting xiang Daobin Liu Yu Zhou Jun Wang Li Song National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China Hefei National Laboratory for Physical Science at the Microscale School of Life Sciences University of Science and Technology of China Hefei 230027 China

In this study, we present the preparation of stable 1T-WS2 ultrathin nanosheets with NH~ intercalation using a bottom-up hydrothermal method and the potential application of this material in light-induced photothermal cancer therapy. Our results revealed that nanosheets with a size of 150 nm were highly hydrophilic and exhibited strong light absorption and excellent photostability in the broad near-infrared wavelength region. The in vitro experimental results indicated good biocompatibility of the nanosheets. More notably, our in vivo antitumor experiments illustrated that light-induced photothermal ablation originating from irradiation of the 1T-WS2 nanosheets with an 808 nm laser could efficiently kill tumor cells; these effects were obtained not only at the cellular level but also in the living organs of mice. This result may lead to new applications of two-dimensional layered materials in novel photothermal therapies and other photothermal related fields.

关键词： hydrothermal ammoniumion-intercalated 1T-WS2 ultrathin nanosheets biocompatibility photostability photothermal therapy

Harnessing Vis-NIR broad spectrum for photocatalytic CO2 reduction over carbon quantum dots-decorated ultrathin Bi2WO6 nanosheets

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Nano Research 2017年第5期10卷 1720-1731页

作者： Xin Ying Kong Wen Liang Tan Boon-Junn Ng Siang-Piao Chai Abdul Rahman Mohamed Multidisciplinary Platform of Advanced Engineering Chemical Engineering Discipline School of Engineering Monash University Jalan Lagoon Selatan 47S00 Bandar Sunway Selangor Malaysia Low Carbon Economy (LCE) Group School of Chemical Engineering Engineering Campus Universiti Sains Malaysia Seri Ampangan 14300 Nibong Tebal Pulau Pinang Malaysia

The photocatalytic reduction of CO2 to energy-rich hydrocarbon fuels is a promising and sustainable method of addressing global warming and the imminent energy crisis concomitantly. However, a vast majority of the existing photocatalysts are only capable of harnessing ultraviolet （UV） or/and visible light （Vis）, whereas the near-infrared （NIR） region still remains unexplored. In this study, carbon quantum dots （CQDs）-decorated ultrathin BizWO6 nanosheets （UBW） were demonstrated to be an efficient photocatalyst for CO2 photoreduction over the Vis-NIR broad spectrum. It is noteworthy that the synthesis procedure of the CQDs/UBW hybrid nanocomposites was highly facile, involving a one-pot hexadecyltrimethylammonium bromide （CTAB）-assisted hydrothermal process. Under visible light irradiation, the optimized 1CQDsAJBW （1 wt.% CQD content） exhibited a remarkable 9.5-fold and 3.1-fold enhancement of CH4 production over pristine Bi2WO6 nanoplatelets （PBW） and bare UBW, respectively. More importantly, the photocatalytic responsiveness of CQDs/UBW was successfully extended to the NIR region, which was achieved without involving any rare earth or noble metals. The realization of NIR-driven CO2 reduction could be attributed to the synergistic effects of （i） the ultrathin nanostructures and highly exposed {001} active facets of UBW, （ii） the excellent spectral coupling of UBW and CQDs, where UBW could be excited by the up-converted photoluminescence of CQDs, and （iii） the electron-withdrawing nature of the CQDs to trap the photogenerated electrons and retard the recombination of charge carriers.

关键词： photocatalysis CO2 reduction near-infrared (NIR) light carbon quantum dots bismuth tungstate ultrathin nanosheets

ultrathin curved PdNiRu nanosheets as bifunctional catalysts for oxygen reduction and ethylene glycol oxidation

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Nano Research 2024年第5期17卷 3777-3784页

作者： Xianzeng Li Tingyu Lu Huan Pang Mingyi Zhang Dongdong Xu Lin Xu Min Han Jun Yang Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China Fujian Cross Strait Institute of Flexible Electronics(Future Technology) Fujian Normal UniversityFuzhou 350117China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China State Key Laboratory of Coordination Chemistry Nanjing UniversityNanjing 210023China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China

Pd-based metallic nanosheets with advanced physicochemical properties have been widely prepared and employed in various electrocatalytic ***,few concerns were focused on their multiple performances in different ***,highly curved and ultrathin PdNiRu nanosheets(NSs)are developed by facile wet-chemistry strategy and exhibit excellent electrocatalytic performance toward both oxygen reduction reaction(ORR)and ethylene glycol oxidation reaction(EGOR).Owing to the synergistically structural(e.g.,ultrathin,curved,defects/steps-rich)and compositional(ternary alloy)advantages,PdNiRu NSs exhibited enhanced ORR and EGOR specific/mass activities and better stability/durability than control *** specific activity(5.52 mA·cm^(−2))and mass activity(1.13 A·mg_(Pd)^(−1))of the PdNiRu NSs in ORR are 4.8 and 3.4 times as the ones of commercial Pt/C,*** mass activity of PdNiRu NSs(3.86 A·mg_(Pd)^(−1))in EGOR is 2.6 times as commercial Pd/C(1.51 A·mg_(Pd)^(−1)).This study is helpful for the development of desired electrocatalysts with multi-functional application in practical fuel cells.

关键词： ultrathin nanosheets noble metal electrocatalysts bifunctional

Tunable ultrathin dual-phase P-doped Bi_(2)MoO_(6) nanosheets for advanced lithium and sodium storage

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Nano Research 2022年第7期15卷 6128-6137页

作者： Fucong Lyu Zhe Jia Shanshan Zeng Fei-Xiang Ma Lulu Pan Lizi Cheng Yan Bao Ligang Sun Weihui Ou Peng Du Yang Yang Li Jian Lu Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China Hong Kong Branch of National Precious Metals Material Engineering Research Centre City University of Hong KongKowloonHong KongChina School of Materials Science and Engineering Southeast UniversityNanjing 211189China School of Science Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering City University of Hong KongKowloonHong KongChina CityU-Shenzhen Futian Research Institute Shenzhen 518045China Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongKowloonHong KongChina Department of Material Science and Engineering City University of Hong KongKowloonHong KongChina

The construction of electrode materials for lithium-ion batteries(LIBs)and sodium-ion batteries(SIBs)has gradually been an appealing and attractive technology in energy storage research *** the present work,a facile strategy of synthesizing ultrathin amorphous/nanocrystal dual-phase P-doped Bi_(2)MoO_(6)(denoted as P-BiMO)nanosheets via a one-step wet-chemical synthesis approach is *** distinct from conventional two-dimensional(2D)nanosheets,our newly developed ultrathin P-BiMO nanosheets exhibit a unique tunable amorphous/nanocrystalline dual-phase structure with several compelling advantages including fast ion exchange ability and superb volume change buffer *** experimental results reveal that our prepared P-BiMO-6 electrode delivers an excellent reversible capacity of 509.6 mA·g^(−1) after continuous 1,500 cycles at the current densities of 1,500 mA·g^(−1) and improved rate performance for *** the meanwhile,the P-BiMO-6 electrode also shows a reversible capacity of 300.6 mA·g^(−1) after 100 cycles at 50 mA·g^(−1) when being used as the SIBs *** present work uncovers an effective dual-phase nanosheet structure to improve the performance of batteries,providing an attractive paradigm to develop superior electrode materials.

关键词： amorphous/nanocrystalline dual-phase structure ultrathin nanosheets P-doped Bi_(2)MoO_(6) anode materials lithium-ion batteries sodium-ion batteries

Novel MoS2 Microspheres Formed by Solid-State Assembly of Ultratliin Nanoslieets

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Journal of Wuhan University of Technology(Materials Science) 2017年第1期32卷 33-36页

作者：徐晶 DONG Linjian ZHANG Kun 李长生 School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China Key Laboratory of Tribology of Jiangsu Province Zhenjiang 212013China JingJiang Colleage diangsu UniversityZhenjiang 212013China

The MoS2 microspheres with high specific surface area assembled by ultrathin nanosheets have been successfully synthesized by a facile and environmentally friendly reaction in a closed reactor at moderate *** solid-state assembly was realized by a simple calcination process,and the annealing temperature played a key role in the formation of the final *** influences of reaction temperature were carefully investigated.A possible formation mechanism about the solid-state assembly was proposed based on the experimental results.

关键词： sulfides microspheres ultrathin nanosheets crystal morphology

Electrosynthesis of Co3O4 and Co（OH）2 ultrathin nanosheet arrays for efficient electrocatalytic water splitting in alkaline and neutral media

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Nano Research 2018年第1期11卷 323-333页

作者： Lin Zhang Bingrui Liu Ning Zhang Mingming Ma CAS Key Laboratory of Soft Matter Chemistry iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Department of Chemistry University of Science and Technology of China Hefei 230026 China Department of Biology and Environmental Engineering Hefei University Hefei230022 China

The dimensional confinement endows ultrathin nanosheets with unique physical and chemical properties, which have been widely studied for the purpose of developing active electrocatalysts for water splitting. ultrathin nanosheets are generally synthesized by chemical vapor deposition, exfoliation, or surfactant- assisted synthesis, which either require special equipment and reaction conditions, or is limited by the low yields and the difficulty in controlling the lateral size and structure of the nanosheets. In addition, achieving a high loading of ultrathin nanosheets on the electrodes without compromising their catalytic activity still remains a challenge. Herein, we report a simple electrodeposition method for preparing C0304 and Co（OH）2 ultrathin nanosheet arrays （UNA） without using templates or surfactants. The obtained arrays exhibit high activity for oxygen and hydrogen evolution reactions, in both alkaline and neutral media. The electrolyzer based on Co304 and Co（OH）2 UNA shows superior activity and stability than that based on IrO2 and Pt/C, which demonstrates the potential of the present electrodeposition method for developing active and stable electrocatalysts for water splitting.

关键词： electrosynthesis water splitting electrocatalysts non-noble metal ultrathin nanosheets

Construction of hierarchical three-dimensional interspersed flower-like nickel hydroxide for asymmetric supercapacitors

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Nano Research 2017年第11期10卷 3726-3742页

作者： Wutao Wei Weihua Chen Luoyi Ding Shizhong Cui Liwei Mi Center for Advanced Materials Research Zhongyuan University of Technology Zhengzhou 450007 China College of Chemistry and Molecular Engineering Zhengzhou University Zhengzhou 450001 China

Low-cost and easily obtainable electrode materials are crucial for the application of *** hydroxides have recently attracted intensive attention owning to their high theoretical specific capacitance,high redox activity,low cost,and *** this study,novel three-dimensional （3D） interspersed flower-like nickel hydroxide was assembled under mild *** ammonia was used as the precipitant and inhibitor and CTAB was used as an exfoliation agent,the obtained exfoliated ultrathin Ni（OH）2 nanosheets were assembled into 3D interspersed flower-like nickel *** this novel 3D structure,the ultrathin Ni（OH）2 nanosheets not only provided a large contact area with the electrolyte,reducing the polarization of the electrochemical reaction and providing more active sites,but also reduced the concentration polarization in the electrode solution ***,the utilization efficiency of the active material was improved,yielding a high *** electrochemical performance was improved via promoting the electrical conductivity by mixing the as-synthesized Ni（OH）2 with carbon tubes （N-4-CNT electrode）,yielding excellent specific capacitances of 2,225.1 F＆#183;g-1 at 0.5 A＆#183;g-1 in a three-electrode system and 722.0 F＆#183;g-1 at 0.2 A＆#183;g-1 in a two-electrode *** N-4-CNT//active carbon （AC） device exhibited long-term cycling performance （capacitance-retention ratio of 111.4% after 10,000 cycles at 5 A＆#183;g-1） and a high specific capacitance of 180.5 F＆#183;g-1 with a high energy density of 33.5 W＆#183;h＆#183;kg-1 and a power density of 2,251.6 W＆#183;kg-1.

关键词： energy storage hierarchical nanostructures nickel ultrathin nanosheets supercapacitors