The development of high-performance potassium-ion batteries (PIBs) necessitates the research of anodes with high capacity, long cycle life, and excellent rate performance. In this study, we drew inspiration from the structure of diatoms in nature. Through a simple self-template pyrolysis process , Se and S were doped into carbon matrix, leading to the synthesis of Se/S-doped diatomite-like carbon microflakes (Se, S-DCMs) for PIBs. The porous surface structure resembling diatoms, along with the interconnected carbon fibers within the pores, enhances contact between material and electrolyte, thereby accelerating diffusion of K + . Furthermore, the co-doping of S and Se introduces defects, creating additional reaction sites and increasing capacity. As anodes for PIBs, Se, S-DCMs exhibits high capacity (414 mAh g −1 after 100 cycles at 100 mA g −1 ) and high-rate performance (198 mAh g −1 at 2000 mA g −1 ). This study represents a promising approach for optimizing carbon structures to boosting battery performance.
Formic acid (FA) is widely regarded as a hydrogen storage material with great application potential, so finding a suitable and effective catalyst for FA dehydrogenation to generate pure hydrogen under mild conditions is critical for practical applications. Herein, we converted poplar catkin (PC) with microtube structure into N-doped carbon microsheets (NPC) through carbonization, ultrasonic crushing and modification processes , and further immobilized fine Pd and Co 2 P nanoparticles on NPC microsheets to form a novel ternary catalyst of Pd-Co 2 P/NPC . The Pd-Co 2 P/NPC catalysts have excellent catalytic performance for dehydrogenation of FA under mild conditions, with a high selectivity of 100%, high initial turnover frequency value (TOF) of 2980 h −1 at 50 °C and maintained 1530 h −1 even at 30 °C. The catalyst could be recycled consecutively up to seven times without remarkable change in the catalytic activity. The significantly improved performances of Pd-Co 2 P/NPC can be attributed to high dispersity of Pd-Co 2 P nanoparticles and synergetic effect between different components. These results suggest that the biomass-based NPC microsheets may be a promising low-cost supports for the manufacturing various highly efficient nanocatalyts.
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