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Title N/S-doped hierarchical porous bamboo carbon fibers with ultra-large surface area and highly exposed active sites for flexible zinc-air battery
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  • Yuhang Qian,
  • Xinye Liu,
  • Xiangjun Zheng,
  • Zilong Yang,
  • Yanjie Yu,
  • Fei Gao,
  • Xingmei Guo,
  • Yuanjun Liu,
  • Xuecheng Cao,
  • Junhao Zhang
Yuhang Qian
Jiangsu University of Science and Technology
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Xinye Liu
Jiangsu University of Science and Technology
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Xiangjun Zheng
Jiangsu University of Science and Technology
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Zilong Yang
Jiangsu University of Science and Technology
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Yanjie Yu
Jiangsu University of Science and Technology
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Fei Gao
Jiangsu University of Science and Technology
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Xingmei Guo
Jiangsu University of Science and Technology
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Yuanjun Liu
Jiangsu University of Science and Technology
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Xuecheng Cao
Jiangsu University
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Junhao Zhang
Jiangsu University of Science and Technology

Corresponding Author:[email protected]

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Abstract

Facile mass transport channel and accessible active sites is crucial for binder-free air electrode catalysts in rechargeable flexible zinc-air battery (ZAB). Herein, a ZnS/NH3 dual-assisted pyrolysis strategy is proposed to prepare N/S-doped hierarchical porous bamboo carbon cloth (HP-NS-BCC) as binder-free air electrode catalyst for ZAB. BCC fabric with abundant micropores is firstly used as flexible carbon support to facilitate the heteroatom-doping and construct the hierarchical porous structure. ZnS nanospheres and NH3 activization together facilitate the electronic modulation of carbon matrix by N/S-doping and optimize the macro/meso/micropores structure of carbon fibers. Benefiting from the highly-exposed N/S-induced sites with enhanced intrinsic activity, the optimized mass transport of biocarbon fibers, as well as the ultra-large specific surface area of 2436.1 m2 g-1, the resultant HP-NS-BCC catalyst exhibits improved kinetics for oxygen reduction/evolution reaction. When applied to rechargeable aqueous ZABs, it achieves a high open-circuit voltage of 1.516 V and a significant peak power density of 249.1 mW cm−2. As binder-free air electrode catalyst, the flexible ZAB also displays stable cycling over 500 cycles with a minimal voltage gap of 0.42 V, showcasing promising applications in flexible electronic devices.
07 May 2024Submission Checks Completed
07 May 2024Assigned to Editor
07 May 2024Review(s) Completed, Editorial Evaluation Pending
17 May 2024Reviewer(s) Assigned
27 May 2024Assigned to Editor
27 May 2024Submission Checks Completed
27 May 2024Review(s) Completed, Editorial Evaluation Pending
27 May 2024Reviewer(s) Assigned