Significantly Enhanced Electrochemical Redox for High-Performance Electrochemical Capacitor via Active Ion-Tunnel Oriented BaCoF4 Electrodes

Guo, Changjin1; Xie, Jiyang1; Wang, Jing1; Li, Lun1; Zhu, Zhu1; Xie, Lin2; Mao, Yongyun1; Hu, Wanbiao1

2021-03-01

10.1002/aenm.202003734

Advanced Energy Materials   影响因子和分区

1614-6832

1614-6840

Active plane and specific morphology with reduced particle sizes have long been considered a promising strategy to achieve superior electrochemical properties, but the active sites involved may not be sufficiently utilized or the surface atomic configurations may obscure the activity. Herein, a novel structural "active orientation" strategy is developed to overcome the aforementioned shortcomings and improve the efficiency at active sites. A transition-metal fluoride BaCoF4 is well controlled to thin the dimensions along an active [31 over bar 0] orientation through a sodium dodecyl benzene sulfonate assisted solution chemistry route. The active orientation facilitates the opening of the ionic pathways, for example, OH- in the electrolyte, to take full advantage of the redox activity of the electrochemically active Co2+/Co3+ cations in [31 over bar 0]-BaCoF4, resulting in significantly enhanced electrochemical redox performance. A high specific capacitance (692 F g(-1) at 1 A g(-1) in 6 m KOH electrolyte) is achieved owing to active-tunnels orientation, approximate to five-fold higher compared to its bulk counterpart. Strikingly, the asymmetric electrochemical capacitor (AEC) fabricated with [31 over bar 0]-BaCoF4 and activated carbon exhibits an ultrahigh energy density of 147.7 Wh kg(-1) at a power density of 1.025 kW kg(-1) (also >100 Wh kg(-1) at 5 kW kg(-1)), much higher than the majority of existing AEC systems.

active orientation electrochemical properties ion tunnels redox structural design

SCI ; EI

英语

通讯

Natural Science Foundation of China[21773205] ; Key R&D program of Yunnan Province[2018BA068]

Chemistry ; Energy & Fuels ; Materials Science ; Physics

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000623239000001

WILEY-V C H VERLAG GMBH

20211010024159

Barium compounds ; Cobalt compounds ; Electrolytes ; Morphology ; Potassium hydroxide ; Redox reactions ; Transition metals

Metallurgy and Metallography:531 ; Electric Batteries and Fuel Cells:702 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Materials Science:951

Web of Science

1.Yunnan Univ, Sch Mat & Energy, Natl Ctr Int Res Photoelect & Energy Mat, Key Lab LCR Mat & Devices Yunnan Prov, Kunming 650091, Yunnan, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Guo, Changjin,Xie, Jiyang,Wang, Jing,et al. Significantly Enhanced Electrochemical Redox for High-Performance Electrochemical Capacitor via Active Ion-Tunnel Oriented BaCoF4 Electrodes[J]. Advanced Energy Materials,2021,11(13).

Guo, Changjin.,Xie, Jiyang.,Wang, Jing.,Li, Lun.,Zhu, Zhu.,...&Hu, Wanbiao.(2021).Significantly Enhanced Electrochemical Redox for High-Performance Electrochemical Capacitor via Active Ion-Tunnel Oriented BaCoF4 Electrodes.Advanced Energy Materials,11(13).

Guo, Changjin,et al."Significantly Enhanced Electrochemical Redox for High-Performance Electrochemical Capacitor via Active Ion-Tunnel Oriented BaCoF4 Electrodes".Advanced Energy Materials 11.13(2021).