Nitrogen and atomic Fe dual-doped porous carbon nanocubes as superior electrocatalysts for acidic H2-O2 PEMFC and alkaline Zn-air battery

• 作者: Xiudong Shi Zonghua Pu Bin Chi Mingrui Liu Siyan Yu Long Zheng Lijun Yang Ting Shu Shijun Liao
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（8）
• 页码范围: 388-395
• 页数: 8页
• 语种: 英文

摘要

Air cathodes with high electrocatalytic activity are vital for developing H2/O2 proton exchange membrane fuel cells (PEMFC) and Zn-air batteries.However,the state-of-the-art air cathodes suffer from either limited catalytic activity or high cost,which thus hinder their applications.Herein,we designed ZIF-8 derived nitrogen and atomic iron dual-doped porous carbon nanocubes as high-quality catalysts for ORR,through a novel gas-doping approach.The porous carbon nanocubic architecture and abundant Fe-Nx active species endow ZIF-8 derived single atomic iron catalyst (PCN-A@Fe SA) with superior catalytic activity,and surpass Pt/C and a majority of the reported catalysts.Both XAS and DFT calculations suggest that Fe2+N4 moieties are the main active centers that are favorable for oxygen affinity and OH* intermediate desorption,which can result in promising catalytic performance.Most importantly,PCNA@Fe SA can achieve power density of 514 mW cm-2 as cathodic catalyst in a PEMFC and discharge peak power density of 185 mW cm-2 in an alkaline Zn-air battery.The outstanding performance is derived from both the high specific surface area and high-density of iron single atom in nitrogen doped nanocubic carbon matrix.