105 Cyclable Pseudocapacitive Na-Ion Storage of Hierarchically Structured Phosphorus-Incorporating Nanoporous Carbons in Organic Electrolytes,ACS Energy Letters

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105 Cyclable Pseudocapacitive Na-Ion Storage of Hierarchically Structured Phosphorus-Incorporating Nanoporous Carbons in Organic Electrolytes
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-02-13 00:00:00 , DOI: 10.1021/acsenergylett.8b00068
Sul Ki Park ₁ , Sung Hyun Kwon ₂ , Seung Geol Lee ₂ , Min Sung Choi ₁ , Dong Hoon Suh ₁ , Puritut Nakhanivej ₁ , Hyunjoo Lee ₃ , Ho Seok Park _{1,

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Affiliation

Despite the significant impact of sodium (Na) storage systems in terms of natural abundance and environmental friendliness, high-performance pseudocapacitive mterials in organic electrolytes remain challenging. Here, we demonstrate the pseudocapacitive Na-ion storage of hierarchically structured, phosphorus-incorporating steam-activated nanoporous carbons (P-aCNs) with improved rate and cyclic capabilities in organic electrolytes. The P-aCNs with a hierarchical honeycomb structure are derived from lignocellulosic biomass via a proposed synthetic process. The prominent pseudocapacitive behaviors of the P-containing groups in organic Na-ion electrolytes are confirmed by the surface area-independent and surface-confined capacitances, distinctive redox waves, and strong binding with Na-ions. In particular, the P-aCN demonstrates the cyclic stability of 96.0% over 100 000 cycles in the full cell, achieving a high capacitance of 265.43 F g^–1 and rate capability of 75%. These Na-ion pseudocapacitive features of P-aCNs arising from the hierarchical interconnected porosity and the redox-active P=O bonds are comprehensively investigated by experimental and computational analyses.

中文翻译：

10 ⁵在有机电解质中分层结构结合磷的纳米多孔碳的可循环伪电容性钠离子存储

尽管钠（Na）存储系统在自然丰度和环境友好性方面具有重大影响，但有机电解质中的高性能假电容材料仍然具有挑战性。在这里，我们展示了有机电解质中具有提高的速率和循环能力的分层结构，掺磷的蒸汽活化纳米多孔碳（P-aCNs）的拟电容性Na离子存储。具有分级蜂窝结构的P-aCNs是通过拟议的合成方法从木质纤维素生物质衍生而来的。有机钠离子电解质中含P的基团具有明显的拟电容行为，这与表面积无关和表面约束电容，独特的氧化还原波以及与钠离子的牢固结合有关。尤其是，^–1，额定能力为75％。通过实验和计算分析全面研究了由分层互连的孔隙度和氧化还原活性的P = O键引起的P-aCN的这些Na离子假电容特征。

更新日期：2018-02-13

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