香港城大《AFM》原位生長mof衍生取向Zr-Mn氧化物超級電容器電極

由高分子能源發佈 2022-12-26T15:20:24.271735+00:00

CV curves at 50 mV s−1 for a) CuO in positive potential window， b) Zr-Mn-oxide@Cu in negative potential window， and c) Zr-Mn-oxide@CuO@Cu in both negative and positive potential window. Comparison of the d) specific capacities at same current density， and e) maximum specific capacity with reported data. f) Stability and Coulombic efficiency of Zr-Mn-oxide@CuO@Cu at 20 A g−1 for 20000 cycles. g) Comparison of stability of Zr-Mn-oxide@CuO@Cu with reported data， and h) mechanism involved in Zr-Mn-oxide@CuO@Cu as effective electrode.

近年來金屬有機骨架(MOF)衍生電極材料在超級電容器(SC)技術領域引起了廣泛的研究興趣。本文將MOF衍生的Zr-Mn-氧化物與無溶液CuO納米線連續結合，不僅避免了MOF的結構限制，還製備了正負雜化電極材料。通過原位製備製備的mof衍生混合金屬氧化物允許定向Zr-Mn-oxide@CuO@Cu均勻單向生長。在1.2 V (- 0.6 ~ 0.6 V)的寬電位窗口範圍內，混合電極在2萬次循環後表現出100%以上的穩定性。此外，獲得的Zr-Mn-oxide@CuO@Cu混合電極與mof衍生的zr - mn -氧化物(- 0.6 ~ 0.1 V)和CuO (0.0 ~ 0.5 V)相比，容量分別提高了14.1倍和5.5倍。此外，以雜化Zr-Mn-oxide@CuO@Cu為正極，還原氧化石墨烯為負極的混合器件也顯示出良好的能量和功率密度。此外，利用密度泛函理論計算研究了雜化電極材料的性能。總之，單向垂直排列的mof衍生的Zr-Mn-oxide@CuO@Cu雜化電極材料具有顯著的電化學性能，可用於下一代超級電容器電極的製備。

圖文簡介

a) Schematic diagram of bare Cu mesh, CuO NWs, Zr-Mn-Ooxide@Cu, and Zr-Mn-oxide@CuO@Cu.

SEM images of a) bare Cu mesh, b–d) CuO NWs, e–h) Zr-Mn-oxide@CuO@Cu, and i–l) Zr-Mn-oxide@Cu.

a) SEM image and EDX analysis of Zr-Mn-oxide@CuO@Cu including the elemental mapping for Cu, O, Mn, and Zr. b) TEM images of Zr-Mn-oxide@CuO@Cu, and c) TEM-based elemental mapping for Cu, O, Mn, and Zr.

CV curves at 50 mV s−1 for a) CuO in positive potential window, b) Zr-Mn-oxide@Cu in negative potential window, and c) Zr-Mn-oxide@CuO@Cu in both negative and positive potential window. Comparison of the d) specific capacities at same current density, and e) maximum specific capacity with reported data. f) Stability and Coulombic efficiency of Zr-Mn-oxide@CuO@Cu at 20 A g−1 for 20000 cycles. g) Comparison of stability of Zr-Mn-oxide@CuO@Cu with reported data, and h) mechanism involved in Zr-Mn-oxide@CuO@Cu as effective electrode.

a) Schematic diagram of the fabricated HSC device. b) CV profiles of Zr-Mn-oxide@CuO@Cu and rGO at a same scan rate of 10 mV s−1. c) Ragone plot, and d) stability of the ASC device.

Atomic structures of a) Zr-Mn-oxide and b) Zr-Mn-oxide@CuO@Cu (dashed boxes represent the unit cells), and c) partial density of states (PDOS) of (lower) Zr-Mn-oxide and (upper) Zr-Mn-oxide@CuO.

論文信息

論文題目：Theoretical and Experimental Investigation of In Situ Grown MOF-Derived Oriented Zr-Mn-oxide and Solution-Free CuO as Hybrid Electrode for Supercapacitors

通訊作者：Kaili Zhang

通訊單位：香港城市大學

小編有話說：本文僅作科研人員學術交流，不作任何商業活動。由於小編才疏學淺，不科學之處歡迎批評。如有其他問題請隨時聯繫小編。歡迎關注，點讚，轉發，歡迎互設白名單。投稿、薦稿：polyenergy@163.com