Tuning Sodium Storage Of Mixed-Phase Sodium Titanate Through Carbon Dots

doi:10.7503/cjcu20240356

Chem. J. Chinese Universities

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Tuning Sodium Storage Of Mixed-Phase Sodium Titanate Through Carbon Dots

LI Dan¹, HU Honghui¹, HOU Hongshuai², ZHANG Sheng³, LIU Lijie⁴, JING Mingjun¹, WU Tianjing¹

1. National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, Xiangtan University, Xiangtan 411105, China;
2. State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
3. Institute of Nanoscience and Engineering Henan University, Kaifeng 475004, China;
4. College of Science Henan Agricultural University, Zhengzhou 450002, China

Received:2024-07-16 Revised:2024-09-03 Online:2024-09-04 Published:2024-09-04
Contact: WU Tianjing E-mail:twu@xtu.edu.cn
Supported by:
Supported by the Distinguished Young Scholar Fund Project of Hunan Province Natural Science Foundation (No. 2023JJ10041), the Hunan Provincial Education Office Foundation of China (No. 22A0114), the Natural Science Foundation of Henan Province (No. 232300421228), the Topnotch Talents Program of Henan Agricultural University (No. 30501032), the National Natural Science Foundation of China (No. 22305070).

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Abstract

Abstract: Na2Ti3O7 and Na2Ti6O13 are two typical titanate-based sodium-storage materials, featuring the high theoretical capacity and favorable structure stability, respectively. Regulating the ratio of them in the composite material is the key to strengthen its electrochemical characteristics. Herein, based on the high specific surface area and abundant surface functional groups of carbon dots (CDs), sodium titanate precursors containing CDs were in-situ prepared by one-step hydrothermal method. After the thermal conversion of the precursors, a composite material (NNTO/C) of Na2Ti3O7 and Na2Ti6O13 was obtained, containing conductive carbon derived from CDs. The introduction of conductive carbon not only adjusts the composition ratio of the mixed phases, but also provides a small charge transfer impedance (Rct, 7.48 Ω) and a big specific surface area (100.8 m2/g). As a result, NNTO/C composites exhibit better sodium storage behavior while playing the synergistic interaction of mixed phases. When employed as the anode, after 200 cycles at 50 mA/g, NNTO/C still maintains a specific capacity of 143.8 mAh/g. It also exhibits a high specific capacity of 110 mAh/g at 1000 mA/g. This study suggests an innovative thinking for designing two-phase structures of electrode materials and the greater use of CDs in electrochemical energy storage.

Key words: Na2Ti3O7, Na2Ti6O13, Mixed-phases, Carbon dots, Sodium storage behavior

CLC Number:

O614
O646

TrendMD:

LI Dan, HU Honghui, HOU Hongshuai, ZHANG Sheng, LIU Lijie, JING Mingjun, WU Tianjing. Tuning Sodium Storage Of Mixed-Phase Sodium Titanate Through Carbon Dots[J]. Chem. J. Chinese Universities, doi: 10.7503/cjcu20240356.

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Tuning Sodium Storage Of Mixed-Phase Sodium Titanate Through Carbon Dots

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