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Synergetic Contribution of Boron and Fe–Nx Species in Porous Carbons toward Efficient Electrocatalysts for Oxygen Reduction Reaction
ACS Energy Letters ( IF 22.0 ) Pub Date : 2017-12-28 00:00:00 , DOI: 10.1021/acsenergylett.7b01188
Kai Yuan 1, 2 , Stavroula Sfaelou 3 , Ming Qiu 4 , Dirk Lützenkirchen-Hecht 5 , Xiaodong Zhuang 3, 6 , Yiwang Chen 1 , Chris Yuan 7 , Xinliang Feng 3 , Ullrich Scherf 2
Affiliation  

The development of porous carbon materials as highly efficient, durable, and economic electrocatalysts for oxygen reduction reaction (ORR) is of great importance for realizing practical applications of many significant energy conversion and storage devices. Herein, we demonstrate a general approach to porous carbons decorated with boron centers and atomically dispersed Fe–Nx species (denoted as FeBNC). The as-prepared FeBNC can serve as efficient electrocatalysts for ORR in an alkaline medium with a half-wave potential of 0.838 V vs RHE, comparable to that of the state-of-the-art porous carbon catalysts and the benchmark system Pt/C. Theoretical calculation reveals that incorporation of boron dopant into traditional Fe–Nx species-enriched porous carbons significantly lowers the energy barrier for oxygen reduction and therefore boosts the overall performance. This work not only provides an easy method to synthesize B-doped Fe–Nx centers-enriched porous carbons as highly efficient electrocatalysts for ORR and Zn-air batteries but also proves the origin of the catalytic performance from both B dopants and Fe–Nx sites.

中文翻译:

多孔碳中的硼和Fe–N x物种对高效氧还原反应的电催化剂的协同贡献

多孔碳材料作为用于氧还原反应(ORR)的高效,耐用且经济的电催化剂的开发对于实现许多重要的能量转换和存储设备的实际应用非常重要。在这里,我们展示了一种用硼中心和原子分散的Fe–N x物种(表示为FeBNC)修饰的多孔碳的一般方法。所制备的FeBNC可以用作碱性介质中ORR的有效电催化剂,其半波电位为RHE的0.838 V,与最新的多孔碳催化剂和基准体系Pt / C相当。理论计算表明,将硼掺杂剂掺入传统的Fe–N x中富含物种的多孔碳显着降低了氧气还原的能垒,因此提高了整体性能。这项工作不仅提供了一种简便的方法来合成B掺杂的Fe–N x中心富集的多孔碳,作为ORR和Zn空气电池的高效电催化剂,而且证明了B掺杂剂和Fe–N的催化性能均源于此。x个网站。
更新日期:2017-12-28
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