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interlayer environment engineered MXene: Pre-intercalated Zn^(2+)ions as intercalants renders the modulated Li storage

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Journal of Energy Chemistry 2022年第5期31卷 306-313页

作者： Yixuan Wang Miao Liu Zhihe Wang Qinhua Gu Bo Liu Cuimei Zhao Junkai Zhang Shichong Xu Ming Lu Haibo Li Bingsen Zhang Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education The Joint Laboratory of MXene MaterialsJilin Normal UniversityChangchun 130103JilinChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Key Laboratory of Preparation and Application of Environmental Friendly Materials of the Ministry of Education Jilin Normal UniversityChangchun 130103JilinChina School of Materials Science and Engineering University of Science and Techonology of ChinaShenyang 110016LiaoningChina

The intercalation of foreign species into MXene, as an approach of tuning the interlayer environment, is employed to improve electrochemical ion storage behaviors. Herein, to understand the effect of confined ions by the MXene layers on the performance of electrochemical energy storage, Zn^(2+) ions were employed to intercalate into MXene via an electrochemical technique. Zn^(2+) ions induced a shrink of the adjacent MXene layers. Meaningfully, a higher capacity of lithium ion storage was obtained after Zn^(2+) preintercalation. In order to explore the roles of the intercalated Zn^(2+) ions, the structural evolution, and the electronic migration among Zn, Ti and the surface termination were investigated to trace the origination of the higher Li^(+) storage capacity. The pre-intercalated Zn^(2+) ions lost electrons, meanwhile Ti of MXene obtained electrons. Moreover, a low-F surface functional groups was achieved. Contrary to the first shrink, after 200 cycles, a larger interlayer distance was monitored, this can accelerate the ion transport and offer a larger expansile space for lithium storage. This may offer a guidance to understand the roles of the confined ion by two-dimensional(2D) layered materials.

关键词： Ti_(3)C_(2)T_(x)MXene Zinc ions interlayer intercalation Lithium storage

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High-metallic-phase-concentration MO1-xWxS2 nanosheets with expanded interlayers as efficient electrocatalysts

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Nano Research 2018年第3期11卷 1687-1698页

作者： Qun He Yangyang Wan Hongliang Jiang Chuanqiang Wu Zhongti Sun Shuangming Chen Yu Zhou Haiping Chen Daobin Liu Yasir A. Haleem Binghui Ge Xiaojun Wu Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei 230029 China CAS Key Lab of Materials for Energy Conversion CAS Center for Excellence in Nanoscience Hefei National Laboratory for Physical Science at the Microscale Synergetic Innovation of Quantum Information & Quantum Technology University of Science and Technology of China Hefei 230026 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

In most cases, layered transition metal dichalcogenides （LTMDs）, containing metallic phases, show electrochemical behavior different from their semiconductor counterparts. Typically, two-dimensional layered metallic 1T-MoS2 demonstrates better electrocatalytic performance for water splitting compared to its 2H counterpart. However, the characteristics of low metallic phase concentration and poor stability limit its applications in some cases. Herein, we demonstrate a simple and efficient bottom-up wet-chemistry strategy for the large-scale synthesis of nanoscopic ultrathin Mo1-xWxS2 nanosheets with enlarged interlayer spacing and high metallic phase concentration. Our characterizations, including X-ray absorption fine structure spectroscopy （XAFS）, high-angle annular dark-field- scanning transmission electron microscopy （HAADF-STEM）, and X-ray photoelectron spectroscopy （XPS） revealed that the metallic ultrathin ternary Mo1-xWxS2 nanosheets exhibited distorted metal-metal bonds and a tunable metallic phase concentration. As a proof of concept, this optimized catalyst, with the highest metallic phase concentration （greater than 90%）, achieved a low overpotential of about -155 mV at a current density of -10 ma/cm^2, a small Tafel slope of 67 mV/dec, and an increased turnover frequency （TOF） of 1.3 H2 per second at an overpotential of -300 mV （vs. reversible hydrogen electrode （RHE））, highlighting the importance of the metallic phase. More importantly, this study can lead to a facile solvothermal route to prepare stable and high-metallic- phase-concentration transition-metal-based two-dimensional materials for future applications.

关键词： wet-chemistr gram-scale synthesis interlayer intercalation metallic transition metaldichalcogenide electrocatalytic water splitting

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