Create Rich Oxygen Defects of Unique Tubular Hierarchical Molybdenum Dioxide to Modulate Electron Transfer Rate for Superior High-Energy Metal-Ion Hybrid Capacitor  

作　　者：Heng Zhang Jinggao Wu Zhuo Zou Youcun Bai Chao Wu Qingxin Zeng Feng Liu Wei Shen Jian Jiang Chang Ming Li 

机构地区：[1]Institute of Clean Energy and Advanced Materials,School of Materials and energy,Southwest University,Chongqing 400715,China [2]Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies,Chongqing 400715,China [3]Key Laboratory of Rare Earth Optoelectronic Materials&Devices,College of Chemistry and Materials Engineering,Huaihua University,Huaihua 418000,China [4]School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 401331,China [5]Institute of Materials Science and Devices,School of Materials Science and Engineering,Suzhou University of Science and Technology,Suzhou 215011,China

出　　处：《Energy & Environmental Materials》2023年第3期193-204,共12页能源与环境材料（英文）

基　　金：the financial support from the National Natural Science Foundation of China(51802269).

摘　　要：Metal-ion capacitors could merit advantages from both batteries and capacitors,but they need to overcome the severe restrictions from their sluggish reaction kinetics of the battery type electrode and low specific capacitance of capacitor type electrode for both high energy and power density.Herein,we use the Kirkendall effect for the first time to synthesize unique tubular hierarchical molybdenum dioxide with encapsulated nitrogen-doped carbon sheets while in situ realizing phosphorus-doping to create rich oxygen vacancies(P-MoO_(2-x)@NP-C)as a sodium-ion electrode.Experimental and theoretical analysis confirm that the P-doping introduced oxygen defects can partially convert the high-bond-energy Mo–O to low-bond-energy Mo–P,resulting in a low oxidation state of molybdenum for enhanced surface reactivity and rapid reaction kinetics.The as-prepared P-MoO_(2-x)@NP-C as an ion-battery electrode is further used to pair active N-doped carbon nanosheet(N-C-A)electrode for Na-ion hybrid capacitor,delivering excellent performance with an energy density of 140.3 Wh kg^(−1),a power density of 188.5 W kg^(−1)and long stable life in non-aqueous solution,which ranks the best among all reported MoO x-based hybrid capacitors.P-MoO_(2-x)@NP-C is also used to fabricate a zinc-ion hybrid capacitor,also accomplishing a remarkable energy density of 43.8 Wh kg^(−1),a power density of 93.9 W kg^(−1),and a long stable life@2A g^(−1)of 32000 cycles in aqueous solutions,solidly verifying its universal significance.This work not only demonstrates an innovative approach to synthesize high-performance metal ion hybrid capacitor materials but also reveals certain scientific insights into electron transfer enhancement mechanisms.

关 键 词：molybdenum dioxide oxygen vacancies phosphorus incorporation sodium-ion hybrid capacitor Zinc-ion hybrid capacitor 

分 类 号：TQ136.12[化学工程—无机化工] TM53[电气工程—电器]