Conductive substrates with low cost,lightweight,and chemical stability have been highly recognized as alternative current collectors for energy storage devices.Graphite foil is promising to fulfill these requests,wher...Conductive substrates with low cost,lightweight,and chemical stability have been highly recognized as alternative current collectors for energy storage devices.Graphite foil is promising to fulfill these requests,whereas the inert surface chemistry denies its possibility as the carrier with high-mass loading active species.Herein,we report a facile yet efficient laser-mediated strategy to fast regulate graphite foils for robustly loading active species.The smooth and hydrophobic graphite foil surface turned to be a rough,super-hydrophilic one containing oxygen-rich clusters after lasering.The reconstructed surface affords anchors for active species,such as nanostruetured MnO_(2),FeOOH,and Fe_(2)O_(3),with the highest loading mass of 20 mg·cm^(-2).The high-mass loading MnO_(2)electrode offers an areal capacitance of 3933 mF·cm^(-2)at 1 mA·cm^(-2).Then,the asymmetric supercapacitor,fabricated by MnO_(2)and Fe_(2)O_(3)deposited laser-irradiated graphite foils,exhibits improved performance with high energy density,large power capability,and long-term stability.The strategy suggests a reliable way to produce alternative current collectors for robust energy storage devices.展开更多
In conventional tungsten oxide-based electrochromic batteries(ECBs),tungsten oxide acts as the cathode and Zn foil as the anode,but low redox potential leads to a limited discharge plateau,low areal capacitance,and po...In conventional tungsten oxide-based electrochromic batteries(ECBs),tungsten oxide acts as the cathode and Zn foil as the anode,but low redox potential leads to a limited discharge plateau,low areal capacitance,and power density,restricting practical applications.In this study,a novel WO_(3)||acid-modified graphite foil(WO_(3)||AGF)ECB was developed using AGF as the cathode,WO_(3) as the anode,and a hybrid Zn^(2+)/Al^(3+)electrolyte.The AGF offers advantages,such as high ion storage capacity,fast kinetics,and a high electrode potential,ensuring a high discharge voltage and capacity for the WO_(3)||AGF ECB.The prepared WO_(3)||AGF ECB not only exhibits excellent electrochromic performance but also demonstrates superior energy storage capabilities.At a charge/discharge current density of 0.5 mA·cm^(-2),the WO_(3)||AGF ECB achieves a stable discharge capacity of 315.6 mAh·m^(-2),which is 7.8 times higher than that of the traditional Zn||WO_(3) ECB.Moreover,the rapid ion diffusion kinetics of the AGF ensure the cycling stability of the device at high voltages,maintaining 94.4%optical modulation after 8000 coloring/bleaching cycles.This work provides a novel approach by designing more compatible electrode material systems to achieve ECBs with high energy and power densities.展开更多
Rechargeable aqueous aluminum ion batteries(AIBs)are inspiring researchers’enthusiasm due to the low cost and high theoretical capacity of aluminum.Polyaniline(PANI)materials have the potential for aluminum ion stora...Rechargeable aqueous aluminum ion batteries(AIBs)are inspiring researchers’enthusiasm due to the low cost and high theoretical capacity of aluminum.Polyaniline(PANI)materials have the potential for aluminum ion storage due to the properties of its excellent conductivity and inherent theoretical capacity.However,the poor cycling stability and low loadings of PANI limit its application in energy storage.In this study,PANI-x electrodes with high mass loadings are successfully prepared by the electrodeposition method for reversible AlCl_(2)^(+)storage.Among them,the PANI-2 electrode possesses the highest areal capacity(0.59 and 0.51 mAh cm^(−2)at the current density of 0.5 and 10 mA cm^(−2))and excellent cycling stability in saturated AlCl3.Ex situ N 1s fitting spectra of PANI-2 and molecular dynamics simulations of 1 M,3 M,and saturated AlCl_(3)electrolytes demonstrate that PANI can achieve reversible redox reactions in saturated AlCl3,thereby achieving its excellent stability.Density functional theory calculations and ex situ spectra characterizations of PANI-2 demonstrate the insertion/de-insertion mechanism in the form of AlCl_(2)^(+)ions.In conclusion,PANI-2|Saturated AlCl_(3)|EG(exfoliated graphite foil)full cell is assembled successfully.This work provides promising guidance for the preparation of high-loading electrodes for AIBs.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21975287,22179145 and 22138013)Shandong Provincial Natural Science Foundation(No.ZR2020ZD08)+1 种基金the Startup Support Grant from China University of Petroleum(East China)the Technological Development Grant from Shandong Energy Group Co.,Ltd
文摘Conductive substrates with low cost,lightweight,and chemical stability have been highly recognized as alternative current collectors for energy storage devices.Graphite foil is promising to fulfill these requests,whereas the inert surface chemistry denies its possibility as the carrier with high-mass loading active species.Herein,we report a facile yet efficient laser-mediated strategy to fast regulate graphite foils for robustly loading active species.The smooth and hydrophobic graphite foil surface turned to be a rough,super-hydrophilic one containing oxygen-rich clusters after lasering.The reconstructed surface affords anchors for active species,such as nanostruetured MnO_(2),FeOOH,and Fe_(2)O_(3),with the highest loading mass of 20 mg·cm^(-2).The high-mass loading MnO_(2)electrode offers an areal capacitance of 3933 mF·cm^(-2)at 1 mA·cm^(-2).Then,the asymmetric supercapacitor,fabricated by MnO_(2)and Fe_(2)O_(3)deposited laser-irradiated graphite foils,exhibits improved performance with high energy density,large power capability,and long-term stability.The strategy suggests a reliable way to produce alternative current collectors for robust energy storage devices.
基金supported by the National Natural Science Foundation of China(Nos.52462040 and 52172299)Hainan Province“Nanhai New Star”Science and Technology Innovation Talent Platform Program(No.NHXXRCXM202304)+6 种基金Innovation Team of Universities of Guangdong Province(No.2022KCXTD030)the“Targeted Technology Innovation Initiative”Project at the Foshan National Institute of Innovation(No.JBGS2024002)the Postdoctoral Fellowship Program of CPSF(No.GZB20250029)the China Postdoctoral Science Foundation(No.2025M770830)S.C.would like to acknowledge the support from the External Cooperation Program of the Chinese Academy of Sciences(No.320GJHZ2023011MI)Suzhou Industrial Science and Technology Program(No.SYC2022036)High-end Talents Program of Jiangxi Province(No.jxsq2023101113).
文摘In conventional tungsten oxide-based electrochromic batteries(ECBs),tungsten oxide acts as the cathode and Zn foil as the anode,but low redox potential leads to a limited discharge plateau,low areal capacitance,and power density,restricting practical applications.In this study,a novel WO_(3)||acid-modified graphite foil(WO_(3)||AGF)ECB was developed using AGF as the cathode,WO_(3) as the anode,and a hybrid Zn^(2+)/Al^(3+)electrolyte.The AGF offers advantages,such as high ion storage capacity,fast kinetics,and a high electrode potential,ensuring a high discharge voltage and capacity for the WO_(3)||AGF ECB.The prepared WO_(3)||AGF ECB not only exhibits excellent electrochromic performance but also demonstrates superior energy storage capabilities.At a charge/discharge current density of 0.5 mA·cm^(-2),the WO_(3)||AGF ECB achieves a stable discharge capacity of 315.6 mAh·m^(-2),which is 7.8 times higher than that of the traditional Zn||WO_(3) ECB.Moreover,the rapid ion diffusion kinetics of the AGF ensure the cycling stability of the device at high voltages,maintaining 94.4%optical modulation after 8000 coloring/bleaching cycles.This work provides a novel approach by designing more compatible electrode material systems to achieve ECBs with high energy and power densities.
基金supported by the National Natural Science Foundation of China(Grant No.21906015)the Fundamental Research Funds for the Central Universities(Grant No.N2205006 and N2225013).
文摘Rechargeable aqueous aluminum ion batteries(AIBs)are inspiring researchers’enthusiasm due to the low cost and high theoretical capacity of aluminum.Polyaniline(PANI)materials have the potential for aluminum ion storage due to the properties of its excellent conductivity and inherent theoretical capacity.However,the poor cycling stability and low loadings of PANI limit its application in energy storage.In this study,PANI-x electrodes with high mass loadings are successfully prepared by the electrodeposition method for reversible AlCl_(2)^(+)storage.Among them,the PANI-2 electrode possesses the highest areal capacity(0.59 and 0.51 mAh cm^(−2)at the current density of 0.5 and 10 mA cm^(−2))and excellent cycling stability in saturated AlCl3.Ex situ N 1s fitting spectra of PANI-2 and molecular dynamics simulations of 1 M,3 M,and saturated AlCl_(3)electrolytes demonstrate that PANI can achieve reversible redox reactions in saturated AlCl3,thereby achieving its excellent stability.Density functional theory calculations and ex situ spectra characterizations of PANI-2 demonstrate the insertion/de-insertion mechanism in the form of AlCl_(2)^(+)ions.In conclusion,PANI-2|Saturated AlCl_(3)|EG(exfoliated graphite foil)full cell is assembled successfully.This work provides promising guidance for the preparation of high-loading electrodes for AIBs.
