Carbon nanotubes intercalated Co/N-doped porous carbon nanosheets as efficient electrocatalyst for oxygen reduction reaction and zinc-air batteries
Carbon nanotubes intercalated Co/N-doped porous carbon nanosheets as efficient electrocatalyst for oxygen reduction reaction and zinc-air batteries
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DOI：
10.1016/j.cej.2018.02.039
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发表时间：
2018-06-15
影响因子：
15.1
通讯作者：
Mu, Shichun
中科院分区：
文献类型：
--
作者：
Liu, Shaojun;Amiinu, Ibrahim Saana;Mu, Shichun
地球上丰富的过渡金属和氮共掺杂碳（M-N/C）材料作为贵金属催化剂最可行的替代品尤其具有吸引力。本文通过构建具有独特开放式多孔结构的碳纳米管（CNTs）插层Co/ n掺杂少层碳纳米片（CNTs-Co/NC）杂化结构，制备了高性能催化剂。为了制备催化剂，首先将聚苯胺分子聚合在碳纳米管上，然后进行热处理，形成CNTs-Co/NC。对于CNTs-Co/NC催化剂，其表面积和孔体积分别高达1072 m(2)/g和0.63 cm(3)/g。正如预期的那样，它在碱性介质中表现出较高的ORR性能，起始波电位和半波电位分别为0.96 V和0.84 V（相对于RHE）。令人印象深刻的是，当用作锌空气电池的阴极催化剂时，CNTs-Co/NC也表现出高达83 mWcm（-2）的峰值功率密度，具有长期耐用性和高倍率容量。这种增强的性能可归因于丰富的Co/N偶联中心的协同作用，高表面积和更多暴露的活性位点以及高孔隙度可用于离子传输。
Earth abundant transition-metals and nitrogen co-doped carbon (M-N/C) materials are particularly attractive as the most viable alternative to precious metal catalysts. Herein, a high-performance catalyst is prepared by building a carbon nanotubes (CNTs) intercalated Co/N-doped few layered carbon nanosheet (CNTs-Co/NC) hybrid with a unique open-ended porous structure. To prepare the catalyst, polyaniline molecules are first polymerized on carbon nanotubes and subsequent thermal annealing, resulting in formation of CNTs-Co/NC. For the CNTs-Co/NC catalyst, its surface area and pore volume are as high as 1072 m(2)/g and 0.63 cm(3)/g, respectively. As expected, it displays high ORR performance with an onset and a half wave potential of 0.96 V and 0.84 V (vs. RHE), respectively, in alkaline media. Impressively, when used as a cathode catalyst for zinc-air batteries, CNTs-Co/NC also exhibits a peak power density up to 83 mWcm(-2) with long-term durability and high rate capacity. Such enhanced performance can be attributed to the synergistic effect of the abundant Co/N coupling centers, the high surface area with more exposed active sites, and the high porosity accessible to ion transport.