Metal-Free B, N co-Doped Hierarchical Porous Carbon Electrocatalyst with an Excellent O2 Reduction Performance,ChemistryOpen

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Metal-Free B, N co-Doped Hierarchical Porous Carbon Electrocatalyst with an Excellent O2 Reduction Performance
ChemistryOpen ( IF 2.5 ) Pub Date : 2021-07-26 , DOI: 10.1002/open.202100090
Fangxiao Wang ₁ , Jianhai Ren ₁ , Zihao Zheng ₁ , Qiye Liu ₁ , Chun-Yang Zhang ₁

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Fuel cells have attracted increasing attention due to their low cost, high energy density, low environmental pollution, and abundant raw materials. Oxygen reduction reaction (ORR) is a core technology of fuel cells, and the development of new electrocatalysts with high ORR performance is highly desirable. Herein, we synthesize a series of B, N co-doped hierarchical porous carbons using a soft template method with the integration of self-assembly, calcination and etching. The obtained materials exhibit hierarchical porous structures, controllable pore distribution, partial graphite structures, and B, N co-doping. They can function as the cost-effective and metal-free electrocatalysts, facilitating the diffusion of electrolyte ions and the improvement of ORR performance. Especially, the B, N co-doped porous carbon with the B-to-N molar ratio of 5 (BNC-5) displays a high ORR activity with a half-wave potential (E_1/2) of 0.73 V, an onset potential (E_onset) of 0.94 V, and a high limiting current density (J_L) of 5.98 mA cm⁻², superior to the N-doped C (NC) and BNC-1 (the B-to-N molar ratio=1), BNC-3 (the B-to-N molar ratio=3) and BNC-7 (the B-to-N molar ratio=7) under the identical conditions. Moreover, the BNC-5 exhibits good cycling stability after 5000 cyclic voltammetry (CV) cycles and excellent tolerance toward even 3 M methanol. This research provides a new approach for the facile synthesis of dual element-doped carbon electrocatalysts with high ORR performance.

中文翻译：

具有优异 O2 还原性能的无金属 B、N 共掺杂多级孔碳电催化剂

燃料电池因其成本低、能量密度高、环境污染小、原材料丰富而受到越来越多的关注。氧还原反应（ORR）是燃料电池的核心技术，开发具有高ORR性能的新型电催化剂是非常必要的。在此，我们采用软模板方法，结合自组装、煅烧和蚀刻，合成了一系列B、N共掺杂的分级多孔碳。所得材料表现出分级多孔结构、可控孔分布、部分石墨结构以及B、N共掺杂。它们可以作为经济高效且不含金属的电催化剂，促进电解质离子的扩散和ORR性能的提高。特别是，B-N摩尔比为5的B、N共掺杂多孔碳（BNC-5）表现出高ORR活性，半波电位（ E _1/2 ）为0.73 V，电位（ E _onset ）为0.94 V，极限电流密度（J _L ）为5.98 mA cm ^-2 ，优于N掺杂C（NC）和BNC-1（B与N摩尔比= 1)、相同条件下的BNC-3(B与N摩尔比=3)和BNC-7(B与N摩尔比=7)。此外，BNC-5 在 5000 次循环伏安 (CV) 循环后表现出良好的循环稳定性，甚至对 3 M 甲醇也具有出色的耐受性。该研究为轻松合成具有高ORR性能的双元素掺杂碳电催化剂提供了一种新方法。

更新日期：2021-07-26

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