Increasing battery voltage and electrode utilization is of great significance for improving the energy density of aqueous battery.Herein,for the first time,this work introduces an integrated design strategy to regulat...Increasing battery voltage and electrode utilization is of great significance for improving the energy density of aqueous battery.Herein,for the first time,this work introduces an integrated design strategy to regulate electrode potential and improve electrode utilization based on the concept of electrochemical precipitation energy.By coupling precipitation reaction with original electrode reaction,the Gibbs free energy change(ΔrG^(θ))of the precipitation reaction is coupled to battery reaction’sΔrG^(θ),thereby altering battery’s voltage.Besides,the electrode reaction changes to solid-to-solid reaction after coupling with precipitation reaction,which can improve electrode utilization.The potential of Cu is reduced from 0.34 to-0.96 V(the lowest value among all the reported Cu anode)with a Cu utilization of 87.93%(without additional copper in electrolyte)by coupling Cu_(2)S’s precipitation reaction.Furthermore,the potential of I_(2) is increased from 0.54 to 0.65 V(I_(2)/CuI)and 0.73 V(I_(2)/PbI_(2))by coupling precipitation reaction of CuI and PbI_(2) and the shutting effect of I_(3)^(-)is also limited.As proof of concept,a full Cu_(2)S battery(cathode:S/Cu_(2)S,anode:Cu/Cu_(2)S)is designed with average discharge voltage of 1.12 V,which is the highest value among all the Cu-based aqueous batteries.Due to the certain universality of this strategy,this work provides a new path to regulate the electrode reaction potential and improve electrode utilization.展开更多
The Cu2S/tetrapod-like ZnO whisker（T-ZnOw） heterostructures were successfully synthesized via a simple polyol process employing the poly（vinyl pyrrolidone）（PVP） as a surfactant.The as-prepared heterostructures w...The Cu2S/tetrapod-like ZnO whisker（T-ZnOw） heterostructures were successfully synthesized via a simple polyol process employing the poly（vinyl pyrrolidone）（PVP） as a surfactant.The as-prepared heterostructures were characterized by X-ray diffraction（XRD）,field emission scanning electron microscopy（FESEM）,X-ray photoelectron spectroscopy（XPS） and Fourier transform infrared（FTIR）.The photocatalytic properties of Cu2S/T-ZnOw nanocomposites synthesized with different PVP concentrations were evaluated by photodegradation of methyl orange（MO） under UV irradiation.The results show that the Cu2S/T-ZnOw nanocomposites exhibit remarkable improved photocatalytic property compared with the pure T-ZnOw.The sample prepared with 3.0 g/L PVP shows an excellent photocatalytic property and the highest photodegradation rate of MO is 97% after UV irradiation for 120 min.Besides,the photocatalytic activity of the photocatalyst has no evident decrease even after four cycles,which demonstrates that the Cu2S/T-ZnOw photocatalyst exhibits an excellent photostability.Moreover,the photocatalytic mechanism of the Cu2S/T-ZnOw nanocomposites was also discussed.展开更多
基金financially supported by Ten-thousand Talents Program,K.C.Wong Pioneer Talent Program,China Three Gorges Corporation(No.WWKY-2021-0027)Inner Mongolia Science and Technology Plan(No.2021ZD0033)Shanghai Post-doctoral Excellence Program,Special Research Assistant Project and the National Natural Science Foundation of China(Grant No.52202121).
文摘Increasing battery voltage and electrode utilization is of great significance for improving the energy density of aqueous battery.Herein,for the first time,this work introduces an integrated design strategy to regulate electrode potential and improve electrode utilization based on the concept of electrochemical precipitation energy.By coupling precipitation reaction with original electrode reaction,the Gibbs free energy change(ΔrG^(θ))of the precipitation reaction is coupled to battery reaction’sΔrG^(θ),thereby altering battery’s voltage.Besides,the electrode reaction changes to solid-to-solid reaction after coupling with precipitation reaction,which can improve electrode utilization.The potential of Cu is reduced from 0.34 to-0.96 V(the lowest value among all the reported Cu anode)with a Cu utilization of 87.93%(without additional copper in electrolyte)by coupling Cu_(2)S’s precipitation reaction.Furthermore,the potential of I_(2) is increased from 0.54 to 0.65 V(I_(2)/CuI)and 0.73 V(I_(2)/PbI_(2))by coupling precipitation reaction of CuI and PbI_(2) and the shutting effect of I_(3)^(-)is also limited.As proof of concept,a full Cu_(2)S battery(cathode:S/Cu_(2)S,anode:Cu/Cu_(2)S)is designed with average discharge voltage of 1.12 V,which is the highest value among all the Cu-based aqueous batteries.Due to the certain universality of this strategy,this work provides a new path to regulate the electrode reaction potential and improve electrode utilization.
基金Project (2009AA03Z427) supported by the High-tech Research and Development Program of ChinaProject (2006z02-006-3) supported by the Science Foundation of Sichuan Province,China
文摘The Cu2S/tetrapod-like ZnO whisker（T-ZnOw） heterostructures were successfully synthesized via a simple polyol process employing the poly（vinyl pyrrolidone）（PVP） as a surfactant.The as-prepared heterostructures were characterized by X-ray diffraction（XRD）,field emission scanning electron microscopy（FESEM）,X-ray photoelectron spectroscopy（XPS） and Fourier transform infrared（FTIR）.The photocatalytic properties of Cu2S/T-ZnOw nanocomposites synthesized with different PVP concentrations were evaluated by photodegradation of methyl orange（MO） under UV irradiation.The results show that the Cu2S/T-ZnOw nanocomposites exhibit remarkable improved photocatalytic property compared with the pure T-ZnOw.The sample prepared with 3.0 g/L PVP shows an excellent photocatalytic property and the highest photodegradation rate of MO is 97% after UV irradiation for 120 min.Besides,the photocatalytic activity of the photocatalyst has no evident decrease even after four cycles,which demonstrates that the Cu2S/T-ZnOw photocatalyst exhibits an excellent photostability.Moreover,the photocatalytic mechanism of the Cu2S/T-ZnOw nanocomposites was also discussed.
基金National Natural Science Foundation of China(61204018)Education Committee of Jiangsu Province(11KJB510023,12KJD510011)Nantong Application Program(BK2011012,BK2012039,BK2012044)
