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In Situ Formation of Tungsten Nitride among Porous Carbon Polyhedra for High Performance Zinc–Iodine Batteries
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-04-17 , DOI: 10.1021/acs.jpcc.3c00678
Song Chen 1 , Yulong He 1 , Siyu Ding 1 , Jintao Zhang 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-04-17 , DOI: 10.1021/acs.jpcc.3c00678
Song Chen 1 , Yulong He 1 , Siyu Ding 1 , Jintao Zhang 1
Affiliation
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To address the low capacity and poor stability of aqueous zinc–iodine batteries owing to the insulating nature of iodine and the shuttle effect of polyiodide, herein, tungsten nitride-modified porous carbon polyhedron (W2N/N-C) was prepared via the pyrolysis of ZIF-8 injected with phosphotungstic acid (PTA@ZIF-8). During the thermal treatment process, the self-nitridation enabled the in situ formation of tungsten nitride nanoparticles in hierarchical porous carbon with nitrogen doping for favorable loading of iodine. When used as the electrode material, the zinc–iodine battery exhibited the low polarization during the charge/discharge process with improved reversibility and good cycling stability for 2000 cycles. The improved electrochemical performance would be attributed to the confinement effect of W2N/N-C for the reversible conversion between iodine and polyiodide, thus enhancing the redox reversibility and utilization of active materials. The present work demonstrates an efficient strategy to prepare porous carbon with metal nitrides via the combination of carbonization and self-nitridation process for high-performing zinc–iodine battery.
中文翻译：
用于高性能锌碘电池的多孔碳多面体中原位形成氮化钨
针对碘的绝缘性和聚碘化物的穿梭效应导致水系锌碘电池容量低和稳定性差的问题，本文通过热解制备了氮化钨修饰的多孔碳多面体（W 2 N/NC ）。注入磷钨酸的 ZIF-8 (PTA@ZIF-8)。在热处理过程中，自氮化能够在分层多孔碳中原位形成氮化钨纳米粒子，氮掺杂有利于碘的负载。当用作电极材料时，锌碘电池在充电/放电过程中表现出低极化，改善了可逆性和良好的循环稳定性，可循环 2000 次。改进的电化学性能将归因于 W 的限制效应2 N/NC用于碘和聚碘化物之间的可逆转化，从而提高活性材料的氧化还原可逆性和利用率。目前的工作展示了一种有效的策略，通过碳化和自氮化工艺的结合，用金属氮化物制备多孔碳，用于高性能锌碘电池。
更新日期：2023-04-17
中文翻译：
用于高性能锌碘电池的多孔碳多面体中原位形成氮化钨
针对碘的绝缘性和聚碘化物的穿梭效应导致水系锌碘电池容量低和稳定性差的问题，本文通过热解制备了氮化钨修饰的多孔碳多面体（W 2 N/NC ）。注入磷钨酸的 ZIF-8 (PTA@ZIF-8)。在热处理过程中，自氮化能够在分层多孔碳中原位形成氮化钨纳米粒子，氮掺杂有利于碘的负载。当用作电极材料时，锌碘电池在充电/放电过程中表现出低极化，改善了可逆性和良好的循环稳定性，可循环 2000 次。改进的电化学性能将归因于 W 的限制效应2 N/NC用于碘和聚碘化物之间的可逆转化，从而提高活性材料的氧化还原可逆性和利用率。目前的工作展示了一种有效的策略，通过碳化和自氮化工艺的结合，用金属氮化物制备多孔碳，用于高性能锌碘电池。
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