Boosting Sodium Storage in TiO2 Nanotube Arrays through Surface Phosphorylation,Advanced Materials

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Boosting Sodium Storage in TiO2 Nanotube Arrays through Surface Phosphorylation
Advanced Materials ( IF 27.4 ) Pub Date : 2018-01-03 , DOI: 10.1002/adma.201704337
Jiangfeng Ni ₁ , Shidong Fu ₁ , Yifei Yuan ₂ , Lu Ma ₂ , Yu Jiang ₁ , Liang Li ₁ , Jun Lu ₂

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Sodium‐ion batteries (SIBs) offer a promise of a scalable, low‐cost, and environmentally benign means of renewable energy storage. However, the low capacity and poor rate capability of anode materials present an unavoidable challenge. In this work, it is demonstrated that surface phosphorylated TiO₂ nanotube arrays grown on Ti substrate can be efficient anode materials for SIBs. Fabrication of the phosphorylated nanoarray film is based on the electrochemical anodization of Ti metal in NH₄F solution and subsequent phosphorylation using sodium hypophosphite. The phosphorylated TiO₂ nanotube arrays afford a reversible capacity of 334 mA h g⁻¹ at 67 mA g⁻¹, a superior rate capability of 147 mA h g⁻¹ at 3350 mA g⁻¹, and a stable cycle performance up to 1000 cycles. In situ X‐ray diffraction and transmission electron microscopy reveal the near‐zero strain response and robust mechanical behavior of the TiO₂ host upon (de)sodiation, suggesting its excellent structural stability in the Na⁺ storage application.

中文翻译：

通过表面磷酸化促进TiO2纳米管阵列中的钠存储

钠离子电池（SIB）提供了可扩展，低成本和环境友好的可再生能源存储方式的承诺。然而，阳极材料的低容量和差的速率能力提出了不可避免的挑战。在这项工作中，证明了在Ti衬底上生长的表面磷酸化TiO ₂纳米管阵列可以作为SIB的有效阳极材料。磷酸化的纳米阵列薄膜的制造基于NH ₄ F溶液中Ti金属的电化学阳极氧化以及随后使用次磷酸钠的磷酸化。磷酸化的TiO ₂纳米管阵列在67 mA g ^-1时可提供334 mA hg ^-1的可逆容量，在147 mA hg ^-1时具有出色的速率能力在3350 mA g ^-1时，稳定的循环性能可达1000个循环。原位X射线衍射和透射电子显微镜揭示了TiO ₂主体在（去）饱和时的几乎为零的应变响应和鲁棒的机械性能，表明其在Na ⁺储存应用中具有出色的结构稳定性。

更新日期：2018-01-03

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