【摘 要】
：
Aqueous battery-supercapacitor hybrid devices (BSHs) are of great importance to enrich electrochemical energy storage systems with both high energy and power densities.However,further improvement of BSHs in aqueous electrolytes is greatly hampered by oper
【机 构】
：
Shanghai Key Lab of Chemical Assessment and Sustainability,School of Chemical Science and Engineerin
论文部分内容阅读
Aqueous battery-supercapacitor hybrid devices (BSHs) are of great importance to enrich electrochemical energy storage systems with both high energy and power densities.However,further improvement of BSHs in aqueous electrolytes is greatly hampered by operating voltage and capacity limits.Different from the conventional intercalation/de-intercalation mechanism,Bi2O3 implements charge storage by a rever-sible phase conversion mechanism.Herein,taking Bi2O3 electrode with wide potential window (from-1.2 to 1 V vs.saturated calomel electrode) and high capacity as battery-type anode,we propose that the overall performance of aqueous BSHs can be greatly upgraded under neutral condition.By paring with stable layer-structured δ-MnO2 cathode,a sodium-ion Bi2O3//MnO2 BSH with an ultrahigh voltage of 2.4 V in neutral sodium sulfate electrolyte is developed for the first time.This hybrid device exhibits high capacity (～215 C g-1 at 1 mA cm-2),relatively long lifespan (～77.2％ capacity retention after 1500 cycles),remarkable energy density (71.7 Wh kg-1@400.5 W kg-1) and power density(3204.3 W kg-1@18.8 Wh kg-1).Electrochemical measurements combining a set of spectroscopic tech-niques reveal the reversible phase conversion between bismuth oxide and metallic bismuth (Bi2O3 ≒Bi0) through Bi2+ transition phase in neutral sodium sulfate solution,which can deliver multielectron transfer up to 6,leading to the high-energy BSHs.Our work sheds light on the feasibility of using Bi2O3 electrode under neutral condition to address the issue of narrow voltage and low capacity for aque-ous BSHs.
其他文献
Lithium metal is the ultimate anode material for next-generation high-energy batteries.Yet,the practical application of lithium metal anodes is limited by the formation of Li dendrites and large volume changes.Herein,an effective multi-dimensional hybrid
Doping enables manipulation of both the electrical and optical properties of halide perovskites.Herein,we incorporated Te4+ into Cs2ZrCl6 single crystal,simultaneously preserving the vacancy-ordered struc-ture,to obtain an efficient yellow-emitting perovs
Conversion of levulinic acid and its esters into versatile y-valerolactone (GVL) is a pivotal and challenging step in biorefineries,limited by high catalyst cost,the use of hydrogen atmosphere,or tedious catalyst preparation and recycling process.Here we
Proton exchange membrane fuel cell and direct methanol fuel cells have gained more attention due to high-energy density,remarkable conversion efficiency,and low emission.However,their widely practi-cal application was hindered by the high usage,limited so
To better utilize the infrared (IR) region in sunlight for photovoltaic devices (PVs),upconversion nanoparticles (UCNPs) have been proposed to improve power conversion efficiency (PCE).However,researchers recently have found that the upconversion (UC) eff
The stability issue has become one of the main challenges for the commercialization of perovskite solar cells (PSCs).Formamidinium (FA)-based perovskites have shown great promise owing to their improved thermal and moisture stability.However,these perovsk
It is a great challenge to develop membrane materials with high performance and long durability for acid-alkaline amphoteric water electrolysis.Hence,the graphitic carbon nitride (g-C3N4) nanosheets were compounded with the (2,2\'-m-phenylene)-5,5\'-b
Searching new structured black phosphorus (BP) and exploring intriguing functions and applications have become a hot topic so far.Here,we introduce a novel Iso-type black phosphorus heterostructure guided by first principle calculation,which features uniq
Lithium-sulfur (Li-S) batteries are regarded as one of the promising candidates for the next-generation energy storage system owing to their high capacity and energy density.However,the durable operation for the batteries is blocked by the shuttle behavio
The ever-increasing environmental/energy crisis as well as the rapid upgrading of mobile devices had stimulated intensive research attention on promising alternative energy storage and conversion devices.Among these devices,alkali metal ion batteries,such