With the fast bloom of flexible electronics and green vehicles,it is vitally important to rationally design and facilely construct customized functional materials with excellent mechanical properties as well as high e...With the fast bloom of flexible electronics and green vehicles,it is vitally important to rationally design and facilely construct customized functional materials with excellent mechanical properties as well as high electrochemical performance.Herein,by utilizing two modern industrial techniques,digital light processing(DLP)and chemical vapor deposition(CVD),a unique 3D hollow graphite foam(HGF)is demonstrated,which shows a periodic porous structure and robust mechanical properties.Finite element analysis(FEA)results confirm that the properly designed gyroidal porous structure provides a uniform stress area and mitigates potential structural failure caused by stress concentrations.A typical HGF can show a high Young’s modulus of 3.18 MPa at a low density of 48.2 mg cm^(-3).The porous HGF is further covered by active MnO_(2) material with a high mass loading of 28.2 mg cm^(-2)(141 mg cm^(-3)),and the MnO_(2)/HGF electrode still achieves a satisfactory specific capacitance of 260 F g^(-1),corresponding to a high areal capacitance of 7.35 F cm^(-2) and a high volumetric capacitance of 36.75 F cm^(-3).Furthermore,the assembled quasi-solid-state asymmetric supercapacitor also shows remarkable mechanical properties as well as electrochemical performance.展开更多
基金This project is financed by the Fundamental Research Funds for the Central Universities,Key Research and Development Program of Shaanxi(Nos.2020KWZ-001,2020GXLH-Z-027,and 2020ZDLGY04-08)the National Natural Science Foundation of China(Grant No.51902265)+4 种基金the Natural Science Foundation of Shaanxi Province(Nos.2019JQ-613 and 2017JM1013)the Astronautics Supporting Technology Foundation of China(No.2019-HT-XG)the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(No.CX202065)the Project for Graduate Innovation Team of the Northwestern Polytechnical Universitythe Analytical and Testing Center of the Northwestern Polytechnical University(for SEM and TEM).
文摘With the fast bloom of flexible electronics and green vehicles,it is vitally important to rationally design and facilely construct customized functional materials with excellent mechanical properties as well as high electrochemical performance.Herein,by utilizing two modern industrial techniques,digital light processing(DLP)and chemical vapor deposition(CVD),a unique 3D hollow graphite foam(HGF)is demonstrated,which shows a periodic porous structure and robust mechanical properties.Finite element analysis(FEA)results confirm that the properly designed gyroidal porous structure provides a uniform stress area and mitigates potential structural failure caused by stress concentrations.A typical HGF can show a high Young’s modulus of 3.18 MPa at a low density of 48.2 mg cm^(-3).The porous HGF is further covered by active MnO_(2) material with a high mass loading of 28.2 mg cm^(-2)(141 mg cm^(-3)),and the MnO_(2)/HGF electrode still achieves a satisfactory specific capacitance of 260 F g^(-1),corresponding to a high areal capacitance of 7.35 F cm^(-2) and a high volumetric capacitance of 36.75 F cm^(-3).Furthermore,the assembled quasi-solid-state asymmetric supercapacitor also shows remarkable mechanical properties as well as electrochemical performance.
