Melamine‐Induced N,S‐Codoped Hierarchically Porous Carbon Nanosheets for Enhanced Electrocatalytic Oxygen Reduction,ChemistrySelect

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Melamine‐Induced N,S‐Codoped Hierarchically Porous Carbon Nanosheets for Enhanced Electrocatalytic Oxygen Reduction
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-03-19 , DOI: 10.1002/slct.202000322
Wen‐Wen Tian _{1,

2} , Jin‐Tao Ren _{1,

2} , Xian‐Wei Lv _{1,

2} , Li‐Jiao Gao _{1,

2} , Zhong‐Yong Yuan _{1,

2}

Affiliation

Exploring an efficient strategy to enhance the catalytic oxygen reduction performance of carbon‐based catalysts is of great significance in the field of electrocatalysis. In this work, through a facile polymerization‐carbonization approach under the regulation of melamine, N,S‐codoped hierarchically porous carbon nanosheets with controllable morphology are fabricated by using polyaniline as the precursor. The resultant catalysts have favorable features of the synergetic effect of N,S co‐doping and the advanced structural property with high specific surface area and hierarchical pore structure, contributing to an encouraging onset potential (E_onset = 0.94 V) in alkaline media, comparable to that of Pt/C catalysts, as well as excellent electrochemical stability and methanol tolerance. By rationally adjusting the experimental parameters, the mechanism of melamine on the formation of final porous nanosheet structure during high‐temperature pyrolysis is clarified, and the optimal experimental conditions for the superior catalysts are also discussed. Furthermore, a rechargeable Zn‐air battery constructed with the resulting materials exhibits desirable performance with low charge‐discharge gap and impressive life‐span. This contribution would supply some novel inspiration to design carbon‐based materials with desired features for energy‐related technologies.

中文翻译：

三聚氰胺诱导的N，S-掺杂的分层多孔碳纳米片增强了电催化氧还原

在电催化领域，探索提高碳基催化剂催化氧还原性能的有效策略具有重要意义。在这项工作中，通过在三聚氰胺的控制下进行简便的聚合-碳化方法，以聚苯胺为前体制备了形态可控的N，S掺杂的分级多孔碳纳米片。所得催化剂具有N，S共掺杂的协同作用以及具有高比表面积和分层孔结构的先进结构性能的有利特征，有助于产生令人鼓舞的起始电位（E_起始与Pt / C催化剂相当，在碱性介质中为0.94 V），并且具有出色的电化学稳定性和甲醇耐受性。通过合理调整实验参数，阐明了三聚氰胺在高温热解过程中最终形成多孔纳米片结构的机理，并探讨了最佳催化剂的最佳实验条件。此外，用这种材料制成的可充电Zn-空气电池具有令人满意的性能，充放电间隙小，使用寿命长。这一贡献将为设计具有能源相关技术所需功能的碳基材料提供一些新颖的灵感。

更新日期：2020-03-20

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