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首页> 外文期刊>Carbon: An International Journal Sponsored by the American Carbon Society >Polyvinyl pyrrolidone mediated fabrication of Fe, N-codoped porous carbon sheets for efficient electrocatalytic CO2 reduction
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Polyvinyl pyrrolidone mediated fabrication of Fe, N-codoped porous carbon sheets for efficient electrocatalytic CO2 reduction

机译：聚乙烯吡咯烷酮介导的Fe，n型多孔碳板的制备用于有效的电催化二氧化碳还原

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摘要

Electrochemically converting CO2 into fuels or high value-added chemicals hold a great promise for the utilization of emitted CO2 in the future. Metal-nitrogen active sites (such as Fe-N, Co-N and Ni-N) are supposed to be effective for the electrochemical reduction of CO2 to CO, whereas their catalytic activities are largely dependent on the dispersibility and bonding structures of the catalytically active metals. In this work, we develop atomically dispersed Fe, N-codoped sandwich-like porous carbon sheets using Fe-containing zeolitic imidazolate framework-8 and graphene oxide as precursors and polyvinyl pyrrolidone (PVP) as a mediator. Compared to catalysts without PVP or with another mediator (i.e. polyetherimide), the PVP-mediated carbon sheets show a porous morphology with a higher specific surface area and a more exposed number of Fe-N active sites. Benefiting from this favourable structure, the resultant Fe, N-codoped porous carbon sheets show higher current densities and improved faradaic efficiencies up to 98.6% at -0.62 V (vs. the reversible hydrogen electrode, RHE) for the electrochemical reduction of CO2 to CO. This PVP-mediated strategy could be applied to the fabrication of other metal/nitrogen codoped carbon materials for electrocatalysis. (C) 2019 Elsevier Ltd. All rights reserved.
机译：将CO2电化学转化为燃料或高附加值化学品对未来利用发出的二氧化碳的利用非常有望。应该对金属 - 氮活性位点（例如Fe-N，CO-N和Ni-N）有效地对CO 2至CO的电化学还原是有效的，而它们的催化活性在很大程度上取决于催化剂的分散性和粘合结构活性金属。在这项工作中，我们使用含Fe的沸石咪唑酯骨架-8和作为前体和聚乙烯吡咯烷酮（PVP）作为前体和聚乙烯吡咯烷酮（PVP）的原子上分散的Fe，N-掺杂的夹心状多孔碳片。与没有PVP的催化剂或另一种介体（即聚醚酰亚胺）相比，PVP介导的碳板显示出具有更高的比表面积和更暴露的Fe-N活性位点的多孔形态。从这种有利的结构中受益，所得Fe，N-划分的多孔碳片显示出较高的电流密度，并在-0.62V（Vs.可逆氢电极，RHE）中改善了高达98.6％的游览效率，用于电化学还原CO 2至CO 。该PVP介导的策略可以应用于用于电常分的其他金属/氮编码碳材料的制造。 （c）2019年elestvier有限公司保留所有权利。

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