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| 1 | MXene-coated silk-derived carbon cloth toward flexible electrode for supercapacitor application显示文摘Flexible supercapacitors are promising energy storage devices in wearable smart electronics. Exploring cost-efficient electrodes with high capacitance would promote the wide-scale application of such capacitors. Herein, in order to explore a methodology for preparing low cost, flexible, tough, and up-scalable supercapacitor electrodes, silk textile is directly carbonized to make a conductive free-standing textile substrate. Through mildly baking the surfactant-free Ti_3C_2T_x flakes suspension loaded on the carbonized silk cloth, a uniform and adhesive coating consisting of nanometer-thick Ti_3C_2T_x flakes is well established on the conductive fabric support, forming a MXene-coated flexible textile electrode. The fabricated electrode exhibits a high areal capacitance of 362 m F/cm^2 with excellent cyclability and flexibility. Moreover,capacitance changes neglegibly under the bending deformation mode. This study elucidates the feasibility of using silk-derived carbon cloth from biomss for MXene-based flexible supercapacitor. | Minmin Hu Tao Hu Renfei Cheng Jinxing Yang Cong Cui Chao Zhang Xiaohui Wang | 2018 | Journal of Energy Chemistry2018，27，1： | 10 |
| 2 | Pt immobilized spontaneously on porous MXene/MAX hybrid monolith for hydrogen evolution reaction显示文摘Designing efficient electrocatalysts with low Pt loadings for hydrogen evolution reaction(HER)is urgently required for renewable and sustainable energy conversion.Here,we report a strategy that Pt nanoparticulates are spontaneously immobilized on porous MXene/MAX monolith as HER catalysts by utilizing the redox reaction between Ti3C2Tx MXene and[PtCl4]2 in H2 PtCl6 aqueous solution.By taking advantage of homogeneously distributed Pt nanoparticulates on highly electrically conductive porous Ti3C2Tx/Ti3AlC2 monolith,the as-prepared electrocatalysts show high catalytic performance for hydrogen evolution.Specifically,the binder-free electrocatalysts have Pt loadings as low as 8.9μg/cm^2,with low overpotential of 43 mV at a curre nt density of 10 mA/cm^2 and low Tafel slope that three times lower than porous Ti3C2Tx/Ti3AlC2 without Pt loading.This strategy offers a new approach to constructing ultra-low Pt-loading HER catalysts on the basis of in situ redox reaction between noble metal ions and MXenes. | Cong Cui Renfei Cheng Chao Zhang Xiaohui Wang | 2020 | Chinese Chemical Letters2020，31，4： | 2 |
| 3 | Stabilizing MXene suspension with polyhydric alcohols显示文摘MXenes have promises in myriad applications by virtue of two-dimensional nature and adjustable functional groups.To achieve the applications,MXenes are always first prepared in the form of aqueous suspension.However,fast degradation caused by the attack of dissolved oxygen and water molecules is the main obstacle to the application of MXenes.It has come to light that the degradation preferentially takes place at defective sites and edges where defects enrich.To tackle this problem and increase the stability,herein,using Ti_(3)C_(2)T_(x)MXene as a model material,we report a simple yet efficient strategy for long term storage of MXene suspension by introducing glycerol,a typical polyhydric alcohol.The effectiveness of the strategy is evidenced by structural compositional and morphological investigations.Glycerol protects the defective sites of MXene flakes through restricting water and/or oxygen molecules from reactive sites.This is supported by ab initio molecular dynamics simulations that form hydrogen bonds between MXene and glycerol molecules just over defective sites.Following this mechanism,other polyhydric alcohols,such as ethylene glycol and propylene glycol,are also effective in stabilizing Ti_(3)C_(2)T_(x)MXene suspension.The strategy based on polyhydric alcohols has the potential to be extended to other MXenes,solving the most urgent challenge in the field of MXene engineering. | Renfei Cheng Junchao Wang Tao Hu Yiming Zhao Yan Liang Xiaohui Wang Yanchun Zhou | 2023 | Journal of Materials Science & Technology2023，，34： | 0 |
| 4 | Intercalation-deintercalation design in MXenes for high-performance supercapacitors显示文摘MXene is a new intercalation pseudocapacitive electrode material for supercapacitor application.Intensifying fast ion diffusion is significantly essential for MXene to achieve excellent electrochemical performance.The expansion of interlayer void by traditional spontaneous species intercalation always leads to a slight increase in capacitance due to the existence of species sacrificing the smooth diffusion of electrolyte ions.Herein,an effective intercalation-deintercalation interlayer design strategy is proposed to help MXene achieve higher capacitance.Electrochemical cation intercalation leads to the expansion of interlayer space.After electrochemical cation extraction,intercalated cations are deintercalated mostly,leaving a small number of cations trapped in the interlayer silt and serving as pillars to maintain the interlayer space,offering an open,unobstructed interlayer space for better ion migration and storage.Also,a preferred surface with more-O terminations for redox reaction is created due to the reaction between cations and-OH terminations.As a result,the processed MXene delivers a much improved capacitance compared to that of the original Ti_(3)C_(2)T_(x)electrode(T stands for the surface termination groups,such as-OH,-F,and-O).This study demonstrates an improvement of electrochemical performance of MXene electrodes by controlling the interlayer structure and surface chemistry. | Zhenjiang Li Jun Dai Yiran Li Changlong Sun Alan Meng Renfei Cheng Jian Zhao Minmin Hu Xiaohui Wang | 2022 | Nano Research2022，15，4： | 0 |
| 5 | Corrigendum to“MXene-coated silk-derived carbon cloth toward flexible electrode for supercapacitor application”[J.Energy.Chem.27(2018)161–166]显示文摘The authors regret that the printed version of the above article contained some errors.(1)The SEM images of CSC and CSC@Ti3C2Tx electrode in Fig.1 are corrected to reflect the originality of the images. | Minmin Hu Tao Hua Renfei Cheng Jinxing Yang Cong Cui Chao Zhang Xiaohui Wang | 2022 | Journal of Energy Chemistry2022，31，8： | 0 |
| 6 | Tunnel-structured willemite Zn_(2)SiO_(4):Electronic structure,elastic,and thermal properties显示文摘Willemite Zn_(2)SiO_(4)crystallizes in such a way that Zn and Si are tetrahedrally coordinated with O in an ionic–covalent manner to form ZnO_(4)and SiO_(4)tetrahedra as the building units.The tetrahedra are corner-sharing,of which one SiO_(4)tetrahedron connects eight ZnO_(4)tetrahedra,and one ZnO_(4)tetrahedron links four ZnO_(4)tetrahedra and four SiO_(4)tetrahedra.The unique crystallographic configuration gives rise to parallel tunnels with a diameter of 5.7Åalong the c-axis direction.The tunnel structure of Zn_(2)SiO_(4)definitely correlates with its interesting elastic and thermal properties.On the one hand,the elastic modulus,coefficient of thermal expansion(CTE),and thermal conductivity are low.Zn_(2)SiO_(4)has low Vickers hardness of 6.6 GPa at 10 N and low thermal conductivity of 2.34 W/(m·K)at 1073 K.On the other hand,the elastic modulus and CTE along the c-axis are significantly larger than those along the a-and b-axes,showing obvious elastic and thermal expansion anisotropy.Specifically,the Young’s modulus along the z direction(Ez=179 GPa)is almost twice those in the x and y directions(Ex=Ey=93 GPa).The high thermal expansion anisotropy is ascribed to the empty tunnels along the c-axis,which are capable of more accommodating the thermal expansion along the a-and b-axes.The striking properties of Zn_(2)SiO_(4)in elastic modulus,hardness,CTE,and thermal conductivity make it much useful in various fields of ceramics,such as low thermal expansion,thermal insulation,and machining tools. | Ruqiao DAI Renfei CHENG Jiemin WANG Chao ZHANG Cuiyu LI Hailong WANG Xiaohui WANG Yanchun ZHOU | 2022 | Journal of Advanced Ceramics2022，11，8： | 0 |
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