Abstract:Hexagonal close packed Cr2O3, fabricated by an electrospinning technique combined with a heating method, is adopted for the first time as a catalyst for non-aqueous lithium–oxygen (Li–O2) batteries.
“…S7a. When the LOBs are discharged, the polarization of the electrode is largely increased because of the formation of Li 2 O 2 with poor conductivity [9, 16]. After the recharge, the polarization is reduced and shows little change compared to the original, which is consistent with the results of the SEM images.Fig.…”
Section: Resultssupporting
confidence: 76%
“…Due to the advantageous synergistic effect of bimetals, CuCo 2 O 4 nanoparticles exhibited excellent catalytic activity for LOBs [25]. Recently, using a capacity-controlled method (1000 mAh g −1 ) at a current density of 100 mA g −1 , mesoporous Cr 2 O 3 nanotubes applied as a cathode catalyst for LOBs demonstrated excellent cyclic stability up to 50 cycles [16]. Ru-decorated Co 3 O 4 nanosheets grown on carbon textiles offered high capacity, improved round-trip efficiency, and enhanced cycling capability [26].…”
Rechargeable lithium–oxygen batteries have been considered as a promising energy storage technology because of their ultra-high theoretical energy densities which are comparable to gasoline. In order to improve the electrochemical properties of lithium–oxygen batteries (LOBs), especially the cycling performance, a high-efficiency cathode catalyst is the most important component. Hence, we aim to demonstrate that CuCr2O4@rGO (CCO@rGO) nanocomposites, which are synthesized using a facile hydrothermal method and followed by a series of calcination processes, are an effective cathode catalyst. The obtained CCO@rGO nanocomposites which served as the cathode catalyst of the LOBs exhibited an outstanding cycling performance for over 100 cycles with a fixed capacity of 1000 mAh g−1 at a current density of 200 mA g−1. The enhanced properties were attributed to the synergistic effect between the high catalytic efficiency of the spinel-structured CCO nanoparticles, the high specific surface area, and high conductivity of the rGO.
Electronic supplementary materialThe online version of this article (10.1007/s40820-017-0175-z) contains supplementary material, which is available to authorized users.
“…S7a. When the LOBs are discharged, the polarization of the electrode is largely increased because of the formation of Li 2 O 2 with poor conductivity [9, 16]. After the recharge, the polarization is reduced and shows little change compared to the original, which is consistent with the results of the SEM images.Fig.…”
Section: Resultssupporting
confidence: 76%
“…Due to the advantageous synergistic effect of bimetals, CuCo 2 O 4 nanoparticles exhibited excellent catalytic activity for LOBs [25]. Recently, using a capacity-controlled method (1000 mAh g −1 ) at a current density of 100 mA g −1 , mesoporous Cr 2 O 3 nanotubes applied as a cathode catalyst for LOBs demonstrated excellent cyclic stability up to 50 cycles [16]. Ru-decorated Co 3 O 4 nanosheets grown on carbon textiles offered high capacity, improved round-trip efficiency, and enhanced cycling capability [26].…”
Rechargeable lithium–oxygen batteries have been considered as a promising energy storage technology because of their ultra-high theoretical energy densities which are comparable to gasoline. In order to improve the electrochemical properties of lithium–oxygen batteries (LOBs), especially the cycling performance, a high-efficiency cathode catalyst is the most important component. Hence, we aim to demonstrate that CuCr2O4@rGO (CCO@rGO) nanocomposites, which are synthesized using a facile hydrothermal method and followed by a series of calcination processes, are an effective cathode catalyst. The obtained CCO@rGO nanocomposites which served as the cathode catalyst of the LOBs exhibited an outstanding cycling performance for over 100 cycles with a fixed capacity of 1000 mAh g−1 at a current density of 200 mA g−1. The enhanced properties were attributed to the synergistic effect between the high catalytic efficiency of the spinel-structured CCO nanoparticles, the high specific surface area, and high conductivity of the rGO.
Electronic supplementary materialThe online version of this article (10.1007/s40820-017-0175-z) contains supplementary material, which is available to authorized users.
“…13 kWh kg À1 or 46 MJ kg À1 ). [13][14][15][16] In particular,i nn onaqueousL i-air batteries, tremendousefforts have been made to design variousbifunctional catalysts to reducec harge and discharge overpotential in ether-based electrolytes, such as carbonaceous materials, precious and nonprecious metals, transition-metal oxides, metalorganic frameworks, and other hybrid materials. [6][7][8] Such poor characteristics are primarily influenced by the sluggish kinetics of air/O 2 electrodes or bifunctional oxygen electrocatalysts, whichf acilitate the oxygen reduction reaction( ORR, O 2 + 2Li + + 2e À !Li 2 O 2 )a nd oxygen evolution reaction( OER, Li 2 O 2 !O 2 + 2Li + + 2e À )d uring discharging and chargingp rocesses, respectively, [9][10][11] although operational conditions, electrolyte stability,b inder inertness, the oxygen diffusion on the air cathode and its solubility in electrolyte, and lithium metal anode corrosion may also determine the overall Liair battery performance.…”
Cost-effective dual heteroatom-doped 3D carbon nanofoam-wrapped FeS nanoparticles (NPs), FeS-C, act as efficient bifunctional catalysts for Li-O batteries. This cathode exhibits a maximum deep discharge capacity of 14 777.5 mA h g with a 98.1 % columbic efficiency at 0.1 mA cm . The controlled capacity (500 mA h g ) test of this cathode delivers a minimum polarization gap of 0.73 V at 0.1 mA cm and is sustained for 100 cycles with an energy efficiency of approximately 64 % (1st cycle) and 52 % (100th cycle) at 0.3 mA cm , under the potential window of 2.0-4.5 V. X-ray photoelectron spectroscopy reveals the substantial reversible formation and complete decomposition of Li O . The excellent recharging ability, high rate performance, and cycle stability of this catalyst is attributed to the synergistic effect of FeS catalytic behavior and textural properties of heteroatom-doped carbon nanostructures.
“…36 According to previous reports, the high electrochemical active area may enhance the electrochemical catalytic activities of electrocatalysts. 6,7,9 Although the electrocatalysts used in Li-O 2 batteries in many reports have relative large surface area, the relationship between surface area of catalysts and performances of batteries has not been systematic investigated.…”
Section: 5mentioning
confidence: 99%
“…Several kinds of cathodes with ORR and OER catalysts such as noble metal, 3 carbon materials, 4,5 and transition-metal oxides/nitrides [6][7][8][9][10][11] have been focused on in the past. For example, porous carbon is a desired choice for cathodes due to the outstanding electronic conductivity, the tunable porous structures and the high specic surface area, 4,5 but the poor OER activity leads to high charging potentials over 4.5 V causing negative reactions to the electrolyte and electrode.…”
Lithium-oxygen (Li-O 2 ) batteries as promising energy storage devices possess high gravimetric energy density and low emission. However, poor reversibility of electrochemical reactions at the cathode significantly affects the electrochemical properties of nonaqueous Li-O 2 batteries, and low chargedischarge efficiency also results in short cycle-life. In this work, functional air cathodes containing
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