Stabilizing charge storage of Fe2O3-based electrode via phosphate ion functionalization for long cycling life
Compositing metal oxides with nanostructured carbon or conductive polymer supports has been regarded as a compelling way to develop electrode materials with enhanced energy density as well as large power in super-capacitors.Yet,the corresponding cycling stability is still greatly limited due to the intrinsic dissolution of metal oxide nanostructures during redox processes.Herein,phosphate ions modified Fe2O3 nanoparticles composited with hollow carbon nanosheet arrays have been synthesized as desirable electrodes with both significantly expanded lifespan and high pseudocapacitance.The presence of as-introduced phosphate ions around the surface of Fe2O3 not only can suppress the reductive dissolution of Fe2O3 at progressively negative potentials(-1.3 V(vs.Hg/HgO))but also serve as anchors to the carbon scaffold.The modified Fe2O3@hollow carbon nanosheet arrays deliver a high capacitance of 520 F-g-1 at 5 mV·s-1 and superior cycling stability of 80.1%after 10,000 cycles of charge-discharge at 10 mV.s-1.This surface engineering strategy provides new prospects to suppress the dissolution of metal sites in metal oxide-based electrodes for hybrid supercapacitors.
cycling、electrode、storage、long、life、charge、fe2o3-based、functional、phosphate、stabilizing
42
O646.21;R735.3;R392.12
2023-03-15(万方平台首次上网日期,不代表论文的发表时间)
共8页
39-46