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首页> 外文期刊>ACS applied materials & interfaces >Cu,N-codoped Hierarchical Porous Carbons as Electrocatalysts for Oxygen Reduction Reaction
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Cu,N-codoped Hierarchical Porous Carbons as Electrocatalysts for Oxygen Reduction Reaction

机译：Cu，N掺杂的多级多孔碳作为氧还原反应的电催化剂

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摘要

It remains a huge challenge to develop nonprecious electrocatalysts with high activity to substitute commercial Pt catalysts for oxygen reduction reactions (ORR). Here, the Cu,N-codoped hierarchical porous carbon (Cu-N-C) with a high content of pyridinic N was synthesized by carbonizing Cu containing ZIF-8. Results indicate that Cu-N-C shows excellent ORR electrocatalyst properties. First of all, it nearly follows the four-electron route, and its electron transfer number reaches 3.92 at -0.4 V. Second, both the onset potential and limited current density of Cu-N-C are almost equal to those of a commercial Pt/C catalyst. Third, it exhibits a better half-wave potential (similar to 16 mV) than a commercial Pt/C catalyst. More importantly, the Cu-N-C displays better stability and methanol tolerance than the Pt/C catalyst. All of these good properties are attributed to hierarchical structure, high pyridinic N content, and the synergism of Cu and N dopants. The metal-N codoping strategy can significantly enhance the activity of electrocatalysts, and it will provide reference for the design of novel N-doped porous carbon ORR catalysts.
机译：开发具有高活性的非贵金属电催化剂以替代商业的Pt催化剂来进行氧还原反应（ORR），仍然是一个巨大的挑战。在此，通过碳化含有ZIF-8的Cu，合成了具有高吡啶基N含量的Cu，N掺杂的分级多孔碳（Cu-N-C）。结果表明，Cu-N-C表现出优异的ORR电催化剂性能。首先，它几乎遵循四电子路线，其电子转移数在-0.4 V时达到3.92。其次，Cu-NC的起始电势和极限电流密度几乎与商用Pt / C相等。催化剂。第三，它显示出比市售Pt / C催化剂更好的半波电势（约16 mV）。更重要的是，与Pt / C催化剂相比，Cu-N-C表现出更好的稳定性和甲醇耐受性。所有这些良好的特性归因于分层结构，高吡啶金属氮含量以及铜和氮掺杂剂的协同作用。金属-N共掺杂策略可以显着提高电催化剂的活性，为新型N掺杂多孔碳ORR催化剂的设计提供参考。

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