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

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

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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-MoO2.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-MoO2.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 MoOx-based hybrid capacitors.P-MoO2.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 32 000 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.

molybdenum dioxideoxygen vacanciesphosphorus incorporationsodium-ion hybrid capacitorZinc-ion hybrid capacitor

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

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Institute of Clean Energy and Advanced Materials,School of Materials and energy,Southwest University,Chongqing 400715,China

Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies,Chongqing 400715,China

Key Laboratory of Rare Earth Optoelectronic Materials & Devices,College of Chemistry and Materials Engineering,Huaihua University,Huaihua 418000,China

Institute of Materials Science and Devices,School of Materials Science and Engineering,Suzhou University of Science and Technology,Suzhou 215011,China

School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 401331,China

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国家自然科学基金

51802269

2023

10.1002/eem2.12377

能源与环境材料(英文)

能源与环境材料(英文)

CSCD
ISSN：
年,卷(期)：2023.6(3)
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