Potassium‐ion batteries (PIBs) are promising alternative to Lithium‐ion batteries (LIBs) owing to their economic merits. However, the PIBs have not met suitable anode materials comparable to graphite in LIBs. We synthesised an orange peel‐derived mesoporous carbon (OPDMC) as a potential anode material for high performance PIBs via facile one‐step carbonisation with self‐activation from waste orange peel. The OPDMC‐1000, which were carbonised at 1000 °C, exhibited impressive initial discharge/charge capacities of 408/224 mAh g⁻¹ at 30 mA g⁻¹ and retained the reversible capacity of 208.57 mAh g⁻¹ over 100 cycles. Even after 2000 and 3000 cycles at specific currents of 200 and 500 mA g⁻¹, it maintained the reversible capacities of 150.37 and 112 mAh g⁻¹, respectively. A full cell employing the OPDMC exhibited an initial reversible discharge capacity of 185.32 mAh g⁻¹ at 50 mA g⁻¹ with capacity retention of 71.60 % after 50 cycles, indicating its practical applicability.

中文翻译：

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生物废料橙皮中孔碳作为具有成本效益的阳极材料，对钾离子电池具有超稳定的循环性

由于其经济上的优势，钾离子电池（PIB）有望替代锂离子电池（LIB）。但是，PIB尚未满足与LIB中的石墨相当的合适阳极材料。我们通过废旧橙皮的简单一步碳化和自我活化合成了橙皮中孔碳（OPDMC）作为高性能PIB的潜在阳极材料。在1000°C下碳化的OPDMC-1000在30 mA g ^-1下表现出令人印象深刻的408/224 mAh g ^-1初始放电/充电容量，并在100个循环中保持了208.57 mAh g ^-1的可逆容量。即使在200和500 mA g ^-1的特定电流下经过2000和3000次循环之后，其可逆容量分别保持为150.37和112 mAh g ^-1。使用OPDMC的完整电池在50 mA g ^-1时表现出185.32 mAh g ^-1的初始可逆放电容量，在50次循环后的容量保持率为71.60％，表明其实际适用性。