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
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.
