Ti3C2 MXene-Derived Sodium/Potassium Titanate Nanoribbons for High-Performance Sodium/Potassium Ion Batteries with Enhanced Capacities Yanfeng Dong,† Zhong-Shuai Wu,*,† Shuanghao Zheng,†,§,⊥ Xiaohui Wang,‡ Jieqiong Qin,†,⊥ Sen Wang,†,⊥ Xiaoyu Shi,†,§,∥ and Xinhe Bao†,§ †
Dalian National Laboratory for Clean Energy and §State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People’s Republic of China ‡ Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People’s Republic of China ⊥ University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, People’s Republic of China ∥ Department of Chemical Physics, University of Science and Technology of China, 96 JinZhai Road, Hefei 230026, People’s Republic of China S Supporting Information *
ABSTRACT: Sodium and potassium ion batteries hold promise for next-generation energy storage systems due to their rich abundance and low cost, but are facing great challenges in optimum electrode materials for actual applications. Here, ultrathin nanoribbons of sodium titanate (M-NTO, NaTi1.5O8.3) and potassium titanate (MKTO, K 2Ti 4O9) were successfully synthesized by a simultaneous oxidation and alkalization process of Ti3C2 MXene. Benefiting from the suitable interlayer spacing (0.90 nm for M-NTO, 0.93 nm for M-KTO), ultrathin thickness (
