Highly exposed active sites of Fe/N co-doped defect-rich graphene as an efficient electrocatalyst for oxygen reduction reaction.,Chemistry - An Asian Journal

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Highly exposed active sites of Fe/N co-doped defect-rich graphene as an efficient electrocatalyst for oxygen reduction reaction.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-09-20 , DOI: 10.1002/asia.202000903
Tingwei Zhang _{1,

2} , Zhongfang Li ₁ , Likai Wang ₁ , Shenzhi Zhang ₁ , Yuepeng Liu ₁ , Xueliang Niu ₁

Affiliation

A defect‐rich interconnected hierarchical three‐dimensional Fe and N co‐doped graphene has been prepared by a facile synthesis with poly (2,5‐benzimidazole) (ABPBI) as nitrogen and carbon sources and CaCO₃ as the template. ABPBI possesses abundant nitrogen, and pyrolysis of ABPBI is helpful to form graphene structure. CaCO₃ and its decomposition products CO₂ can promote the formation of interconnected hierarchical porous three‐dimensional graphene, which possesses more defects and exposed active sites. Benefiting from the defective catalysis mechanism, rich defect catalysts are applied as electrode materials to enhance the catalytic performance for oxygen reduction reaction (ORR). Electrochemically, the half‐wave potential (E_1/2) of Fe‐3D‐NG#800 is 0.84 V (vs. RHE), and the accelerated durability tests shows the E_1/2 of Fe‐3D‐NG#800 shifted by a 21 mV drop after cyclic voltammetry scanning for 5000 cycles. Therefore, Fe‐3D‐NG#800 has excellent activity and durability than 20 wt % Pt/C.

中文翻译：

Fe / N共掺杂的富含缺陷的石墨烯的高暴露活性位点是用于氧还原反应的有效电催化剂。

通过以聚（2,5-苯并咪唑）（ABPBI）为氮源和碳源并以CaCO ₃为模板的简便合成，制备了一种富含缺陷的互连的三维Fe和N共掺杂的石墨烯。ABPBI具有丰富的氮，ABPBI的热解有助于形成石墨烯结构。CaCO ₃及其分解产物CO ₂可以促进互连的分层多孔三维石墨烯的形成，该石墨烯具有更多的缺陷和暴露的活性位点。得益于缺陷催化机理，富缺陷催化剂被用作电极材料，以增强氧还原反应（ORR）的催化性能。电化学上的半波电势（E _1/2）Fe‐3D‐NG＃800的电压为0.84 V（vs.RHE），加速耐久性测试显示，经过5000次循环伏安扫描后，Fe‐3D‐NG＃800的E _1/2下降了21 mV 。因此，Fe-3D-NG＃800具有优于20 wt％Pt / C的活性和耐久性。

更新日期：2020-11-04

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