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A Humidity-Induced Nontemplating Route toward Hierarchical Porous Carbon Fiber Hybrid for Efficient Bifunctional Oxygen Catalysis.
Small ( IF 13.0 ) Pub Date : 2020-05-13 , DOI: 10.1002/smll.202001743 Lidong Tian 1, 2 , Dongxiao Ji 1, 2 , Shan Zhang 1, 2 , Xiaowei He 1 , Seeram Ramakrishna 2 , Qiuyu Zhang 1
Small ( IF 13.0 ) Pub Date : 2020-05-13 , DOI: 10.1002/smll.202001743 Lidong Tian 1, 2 , Dongxiao Ji 1, 2 , Shan Zhang 1, 2 , Xiaowei He 1 , Seeram Ramakrishna 2 , Qiuyu Zhang 1
Affiliation
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Hierarchical porous carbons (HPCs) are highly efficient supports for various remarkable catalytic systems. However, templates are commonly utilized for the preparation of HPCs, and the postremoval of the templates is uneconomical, time‐consuming, and harmful for the environment in most cases. Herein, a new humidity‐induced nontemplating strategy is developed to prepare 1D HPC with rich topologies and interconnected cavities for catalysis and energy storage applications. Porous electrospun nanofibers as calcination precursors are prepared via a humidity‐induced phase separation strategy. A nitrogen‐doped hierarchical porous carbon nanofiber (HPCNF), loading Co/Co3O4 hetero‐nanoparticles as exemplary nonprecious‐metal active substance (Co/Co3O4@HPCNF), is fabricated through the subsequent hydrothermal and pyrolysis treatment. The internal mesopore and cavity structure can be simply controlled by varying environment humidity during the electrospinning process. Benefiting from the unique topology, Co/Co3O4@HPCNF exhibits superior bifunctional activity when being used as electrocatalysts for oxygen reduction/evolution reactions. Moreover, the hybrid catalyst also demonstrates a remarkable power density of 102.5 mW cm−2, a high capacity of 748.5 mAh gZn−1, and long cycle life in Zinc–air batteries. The developed approach offers a facile template‐free route for the preparation of HPCNF hybrid and can be extended to other members of the large polymer family for catalyst design and energy storage applications.
中文翻译：
湿度诱导的非模板化途径，用于高效双功能氧催化的分层多孔碳纤维混合体。
分层多孔碳（HPC）是各种出色催化体系的高效载体。但是，模板通常用于制备HPC，并且在大多数情况下，模板的后拆除不经济，耗时且对环境有害。本文中，开发了一种新的湿度诱导非模板化策略，以制备具有丰富拓扑结构和互连腔体的一维HPC，用于催化和能量存储应用。多孔电纺纳米纤维作为煅烧前体是通过湿度诱导的相分离策略制备的。氮掺杂的分级多孔碳纳米纤维（HPCNF），负载Co / Co 3 O 4杂纳米颗粒作为示例性非贵金属活性物质（Co / Co 3 O 4@HPCNF）是通过随后的水热和热解处理制成的。内部中孔和腔的结构可以通过在静电纺丝过程中改变环境湿度来简单地控制。得益于独特的拓扑结构，Co / Co 3 O 4 @HPCNF用作氧还原/放出反应的电催化剂时，具有出色的双功能活性。此外，杂化催化剂还显示出102.5 mW cm -2的出色功率密度，748.5 mAh g Zn -1的高容量，锌空气电池的循环寿命长。开发的方法为制备HPCNF杂化物提供了简便的无模板方法，并且可以扩展到大型聚合物家族的其他成员，用于催化剂设计和储能应用。
更新日期：2020-05-13
中文翻译：
湿度诱导的非模板化途径，用于高效双功能氧催化的分层多孔碳纤维混合体。
分层多孔碳（HPC）是各种出色催化体系的高效载体。但是，模板通常用于制备HPC，并且在大多数情况下，模板的后拆除不经济，耗时且对环境有害。本文中，开发了一种新的湿度诱导非模板化策略，以制备具有丰富拓扑结构和互连腔体的一维HPC，用于催化和能量存储应用。多孔电纺纳米纤维作为煅烧前体是通过湿度诱导的相分离策略制备的。氮掺杂的分级多孔碳纳米纤维（HPCNF），负载Co / Co 3 O 4杂纳米颗粒作为示例性非贵金属活性物质（Co / Co 3 O 4@HPCNF）是通过随后的水热和热解处理制成的。内部中孔和腔的结构可以通过在静电纺丝过程中改变环境湿度来简单地控制。得益于独特的拓扑结构，Co / Co 3 O 4 @HPCNF用作氧还原/放出反应的电催化剂时，具有出色的双功能活性。此外，杂化催化剂还显示出102.5 mW cm -2的出色功率密度，748.5 mAh g Zn -1的高容量，锌空气电池的循环寿命长。开发的方法为制备HPCNF杂化物提供了简便的无模板方法，并且可以扩展到大型聚合物家族的其他成员，用于催化剂设计和储能应用。
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