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首页> 外文期刊>Advanced Functional Materials >Integrated Hierarchical Carbon Flake Arrays with Hollow P-Doped CoSe_2 Nanoclusters as an Advanced Bifunctional Catalyst for Zn-Air Batteries
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Integrated Hierarchical Carbon Flake Arrays with Hollow P-Doped CoSe_2 Nanoclusters as an Advanced Bifunctional Catalyst for Zn-Air Batteries

机译：集成的空心P掺杂CoSe_2纳米簇的分层碳薄片阵列，作为用于锌空气电池的高级双功能催化剂

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摘要

Hierarchical nanostructured architectures are demonstrated as an effective approach to develop highly active and bifunctional electrocatalysts, which are urgently required for efficient rechargeable metal-air batteries. Herein, a mesoporous hierarchical flake arrays (FAs) structure grown on flexible carbon cloth, integrated with the microsized nitrogen-doped carbon (N-doped C) FAs, nanoscaled P-doped CoSe2 hollow clusters and atomic-level P-doping (P-CoSe2/N-C FAs) is described. The P-CoSe2/N-C FAs thus developed exhibit a reduced overpotential (approximate to 230 mV at 10 mA cm(-2)) toward oxygen evolution reaction (OER) and large half-wave potential (0.87 V) for oxygen reduction reactions. The excellent bifunctional electrocatalytic performance is ascribed to the synergy among the hierarchical flake arrays controlled at both micro- and nanoscales, and atomic-level P-doping. Density functional theory calculations confirm that the free energy for the potential-limiting step is reduced by P-doping for OER. An all-solid-state zinc-air battery made of the P-CoSe2/N-C FAs as the air-cathode presents excellent cycling stability and mechanical flexibility, demonstrating the great potential of the hierarchical P-CoSe2/N-C FAs for advanced bifunctional electrocatalysis.
机译：分层的纳米结构被证明是开发高活性和双功能电催化剂的有效方法，这是高效可充电金属空气电池迫切需要的。在此，在柔性碳布上生长的介孔分层鳞片阵列（FA）结构与微米级氮掺杂碳（N掺杂C）FA，纳米级P掺杂CoSe2空心簇和原子级P掺杂（P-描述了CoSe2 / NC FAs。如此开发的P-CoSe2 / N-C FAs朝着析氧反应（OER）的方向降低了过电势（在10 mA cm（-2）时约为230 mV），而对氧还原反应的半波势较大（0.87 V）。出色的双功能电催化性能归因于在微米和纳米级控制的分层薄片阵列与原子级P掺杂之间的协同作用。密度泛函理论计算证实，通过对OER进行P掺杂可以减少势能限制步骤的自由能。由P-CoSe2 / N-C FAs作为空气阴极制成的全固态锌-空气电池具有出色的循环稳定性和机械柔韧性，证明了分层P-CoSe2 / N-C FAs在高级双功能电催化方面的巨大潜力。

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  • 来源
    《Advanced Functional Materials》 |2018年第40期|1804846.1-1804846.9|共9页
  • 作者

    Zhang Hong; Wang Tongtong; Sumboja Afriyanti; Zang Wenjie; Xie Jianping; Gao Daqiang; Pennycook Stephen J.; Liu Zhaolin; Guan Cao; Wang John;

  • 作者单位

    Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore;

    Lanzhou Univ, Key Lab Special Funct Mat & Struct Design MOE, Key Lab Magnetism & Magnet Mat MOE, Lanzhou 730000, Gansu, Peoples R China;

    ASTAR, IMRE, 2 Fusionopolis Way,Innovis 08-03, Singapore 138634, Singapore;

    Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore;

    Natl Univ Singapore, Dept Chem & Biomol Engn, 4 Engn Dr 4, Singapore 117585, Singapore;

    Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore;

    Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore;

    ASTAR, IMRE, 2 Fusionopolis Way,Innovis 08-03, Singapore 138634, Singapore;

    Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore;

    Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore;

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  • 正文语种 eng
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  • 关键词

    bifunctional electrocatalysts; hierarchical flake arrays; phosphorus-doping; Zn-air batteries;

    机译：双功能电催化剂;鳞片状薄片;磷掺杂;锌空气电池;

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