Nitrogenated‐Graphite‐Encapsulated Carbon Black as a Metal‐Free Electrocatalyst for the Oxygen Evolution Reaction in Acid
Nitrogenated‐Graphite‐Encapsulated Carbon Black as a Metal‐Free Electrocatalyst for the Oxygen Evolution Reaction in Acid
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DOI：
10.1002/celc.201701360
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发表时间：
2018-02
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影响因子：
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通讯作者：
Yansong Zhu;Tianran Zhang;J. Lee
中科院分区：
文献类型：
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作者：
Yansong Zhu;Tianran Zhang;J. Lee
不需要金属：通过将离子液体（IL）与炭黑（CB）颗粒热解，制备了由炭黑核上几层氮掺杂石墨组成的核壳状碳催化剂。该催化剂显著提高了纳米碳在酸性溶液中的OER性能。催化剂在酸性溶液中的弹性是由于石墨壳层中含氮的OER活性位点得到了更好的保护。对于仅基于杂原子掺杂的碳纳米材料的无金属催化剂来说，酸性溶液中的析氧反应（OER）非常具有挑战性，迄今为止，这些催化剂表现出相对较低的催化活性和较差的稳定性。在本文中，我们报道了一种核-壳-状碳催化剂，其由通过热解具有炭黑（CB）颗粒的离子液体（IL）制备的炭黑核上的几层氮掺杂石墨组成。与迄今报道的少数无金属OER电催化剂相比，如此制备的催化剂具有显著改善的纳米碳在酸溶液中的OER性能（在10 mA cm-2的电流密度下为1.70 V）。 实验结果表明，催化剂在酸溶液中的弹性是由于石墨壳中含氮OER活性位点的更大保护。
No metal needed: A core‐shell‐like carbon catalyst consisting of a few layers of nitrogen‐doped graphite on a carbon black core was prepared by pyrolyzing an ionic liquid (IL) with carbon black (CB) particles. The catalyst has a noticeably improved OER performance of the nanocarbon in acid solution. The resilience of the catalyst in acid solution is due to the greater protection of the nitrogen‐containing OER active sites in a graphitic shell.The oxygen evolution reaction (OER) in acid solution is very challenging for metal‐free catalysts based only on heteroatom‐doped carbon nanomaterials which have thus far shown relatively low catalytic activity and poor stability. Herein, we report a core‐shell‐like carbon catalyst consisting of a few layers of nitrogen‐doped graphite on a carbon black core prepared by pyrolyzing an ionic liquid (IL) with carbon black (CB) particles. The catalyst prepared as such has a noticeably improved OER performance of the nanocarbon in acid solution (1.70 V at a current density of 10 mA cm−2) in comparison with the few metal‐free OER electrocatalysts reported to date. The experimental results suggest that the resilience of the catalyst in acid solution is due to the greater protection of the nitrogen‐containing OER active sites in a graphitic shell.