Developing high-performance and cost-effective anode materials is essential for advancing sodium-ion battery (SIB) technology. In this study, a dual–metal–organic framework (dual-MOF) strategy was employed to synthesize the Fe 2 Ni MIL MOF@ZIF-8 precursor. After high-temperature carbonization, this precursor was transformed into a composite comprising FeNi alloy nanoparticles encapsulated within N-doped carbon nanotubes (FeNi@NC). Benefiting from its unique three-dimensional porous architecture, the N-doped carbon nanotubes shorten Na + diffusion pathways and accelerate electron transport, while the FeNi alloy nanoparticles supply abundant electrochemical active sites and enhance electrical conductivity. Moreover, the carbon matrix effectively alleviates volume expansion by providing structural confinement. Consequently, when used as an anode for SIBs, it delivers an outstanding long-term cycling life (290.39 mAh g −1 after 1000 cycles at 0.5 A g −1 ) and a high capacity (385.68 mAh g −1 after 200 cycles at 0.1 A g −1 ). The present strategy holds great promise for deriving porous carbon-based materials from MOFs for next-generation energy-storage applications.
Ma Junjie,Liu Hangcheng,Tao Zeyu,Liu Jianfeng,Yuan Binxia,Pan Weiguo,Shi Zhengrong
In order to reveal the relationship between the structure and the electrochemical oxygen reduction reaction (ORR) activity of different double transition metal decorated catalysts, three different double transition metal and N co-doped carbon material cathode catalyst materials (FeCo–NC, FeNi–NC and CoNi–NC) were prepared in this study. The FeCo–NC catalysts synthesised in this study still showed high ORR activity under alkaline conditions, with a half-wave potential of 0.783 V RHE , a mass activity (MA) of 11.36 A/g (0.77 V RHE ) and an ultimate current density of − 4.46 mA cm −2 ; after 30,000 cycles, the half-wave potential only decreased to 99.3% of the initial potential. Meanwhile, we employ MS to establish three different double transition metal and N co-doped graphene catalysts and to calculate and analyse their desorption properties, leading to the FeCo–NC material being the model with the highest ORR activity, which is consistent with the experimental results. Graphical Abstract
危险品化学品经营许可证（带存储）