Nitrogen-doped carbon with high graphitic-N exposure for electroreduction of CO2 to CO
Nitrogen-doped carbon with high graphitic-N exposure for electroreduction of CO2 to CO
复制标题
高石墨氮暴露的氮掺杂碳用于将 CO2 电还原为 CO
DOI：
10.1007/s11581-021-04077-y
复制
发表时间：
2021
期刊：
影响因子：
2.8
通讯作者：
Weiwei Zhu
中科院分区：
文献类型：
--
作者：
Ziyang Shu;Min Liu;Jue Wang;Guanying Ye;Zhen He;Bao Liu;Suqin Liu;Weiwei Zhu
应用氮掺杂碳将CO2电还原为CO越来越受到关注，其中提高碳基材料的CO选择性尤为突出。在这里，我们介绍了一种卤素辅助煅烧策略，用于从 ZIF-8 前驱体构建二维 (2D) 氮掺杂碳。得益于丰富的石墨-N（G-N）和电化学表面积（ECSA）的扩大，二维氮掺杂碳表现出优异的催化活性，在H型电池中，CO的法拉第效率（FE）高达99.5%，在-0.5 V（vs. RHE）的低电位下电流密度为-2.6 mA cm−2，长期稳定性高达20 h以上。 FECO 与 G-N 比率（石墨氮含量与总氮含量的比率）之间存在正相关关系。卤素辅助煅烧可以有效提高G-N比并扩大ECSA，从而提高FECO，是提高碳质材料CO选择性的一种有前景的策略。
Application of nitrogen-doped carbon for electroreduction of CO2 to CO receives increasing attentions, and improving the CO selectivity of carbon-based materials is prominent. Here we introduce a halogen-assisted calcination strategy for constructing two-dimensional (2D) nitrogen-doped carbon from ZIF-8 precursor. Benefitting from the abundant graphitic-N (G-N) and the enlargement of electrochemical surface area (ECSA), 2D nitrogen-doped carbon presents excellent catalytic activity with the high faradaic efficiency (FE) of CO reaching 99.5% and current density of −2.6 mA cm−2 at a low potential of −0.5 V (vs. RHE) in H-type cell, with the long-term stability up to more than 20 h. A positive correlation between FECO and the ratio of G-N (the ratio of graphitic-N content to total N content.) is revealed. The halogen-assisted calcination can effectively increase the G-N ratio and enlarge ECSA, thereby increasing FECO, which is a promising strategy for improving CO selectivity of carbonaceous materials.