High-performance single atom bifunctional oxygen catalysts derived from ZIF-67 superstructures

By Xueping Sun, Shixiong Sun, Songqi Gu, Zhaofeng Liang, Jinxu Zhang, Yuqi Yang, Z. Deng, P. Wei, Jian Peng, Yue Xu and 5 more. Nano Energy, 2019

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Abstract Single-atom catalysts (SACs) always exhibit distinctive catalytic activities for oxygen reduction/evolution reactions (ORR/OER), making SACs relevant in a number of crucial applications including fuel cells, metal-air batteries, as well as in industrial applications. Recently, fabricating SACs with rich multidimensional nanoarchitectures has become fascinating but challenging. Here, for the first time, we explore a facile and practicable “sacrificed-template” method to prepare cobalt single-atom electrocatalysts with Urchin-like Nano-Tube hierarchical structures (UNT Co SAs/N-C) derived from well-aligned metal-organic-frameworks (MOFs) superstructure (UNT ZIF-67). The as-prepared UNT Co SAs/N-C catalysts exhibit superior performance both in ORR/OER. XAFS and density functional theory (DFT) calculations reveal that outstanding catalytic activities stem from high-quality single-atom dispersion, precise local coordination of CoN4, and well-aligned carbon matrix based on MOFs superstructures. Our work provides new perspective in enriching SACs synthesis methodologies.

Subfields: Electrical and Electronic Engineering, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/710f8761d3b649a7b7e2eb05fab5e7fac22c06e5