Modulating Metal–Organic Frameworks as Advanced Oxygen Electrocatalysts

• Published in: Advanced energy materials 2021-04, Vol.11 (16), p.n/a
• Main Authors: Li, Zhaoqiang, Gao, Rui, Feng, Ming, Deng, Ya‐Ping, Xiao, Dengji, Zheng, Yun, Zhao, Zhao, Luo, Dan, Liu, Youlin, Zhang, Zhen, Wang, Dandan, Li, Qian, Li, Haibo, Wang, Xin, Chen, Zhongwei
• Format: Article
• Language: English
• Subjects: active sites modulation; Clean energy; Electrocatalysts; energy conversion; energy storage; Fuel cells; Heterostructures; Metal-organic frameworks; Morphology; oxygen electrocatalysts; Oxygen evolution reactions; Oxygen reduction reactions; Rechargeable batteries
• ISSN: 1614-6832; 1614-6840
• DOI: 10.1002/aenm.202003291

Oxygen‐related electrocatalysis, including those used for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), play a central role in green‐energy related technologies. Rational fabrication of effective oxygen electrocatalysts is crucial for the development of oxygen related energy devices, such as fuel cells and rechargeable metal–air batteries. Recently, owing to their tunable compositions and microstructures, metal–organic frameworks (MOFs) based materials have drawn extensive attention as nonprecious oxygen electrocatalysts. Various strategies have been developed to fabricate MOF‐based electrocatalysts and regulate their active sites, such as heterometal doping, defect engineering, morphology tuning, heterostructure construction, and hybridization. In this review, by focusing on various modulation strategies aiming at active sites, the recent advances of MOF‐based electrocatalysts are summarized. The synthetic methods used to synthesize various MOF‐based oxygen electrocatalysts are discussed, followed by the underlying engineering mechanisms required to allow performance enhancement, and finally some existing challenges that hinder for their practical applications are discussed alongside a perspective on their possible future. Recent advances in active sites engineering strategies on metal–organic framework (MOF) based oxygen electrocatalysts are summarized, including secondary metal doping, coordination optimization, defect engineering, structure optimization, heterostructure construction, and hybridization. The fundamental understanding for these strategies and the synthetic methods are provided. Some existing challenges and possible solutions to the issues facing MOF‐based oxygen electrocatalysts are presented.