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Ultrastable bimetallic fe_(2)mo for efficient oxygen reduction reaction in pH-universal applications

Nano Research 2022年第6期15卷 4950-4957页

作者： Jue Hu Chengxu Zhang Mingzi Sun Qianglong Qi Shanxiong Luo Hongchuan Song Jingyi Xiao Bolong Huang Michael K.H.Leung Yingjie Zhang The Engineering Laboratory of Advanced Battery and Materials of Yunnan Province Kunming University of Science and TechnologyKunming 650093China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina School of Energy and Environment Science Yunnan Normal UniversityKunming 650500China Ability R&D Energy Research Centre School of Energy and EnvironmentCity University of Hong KongHong KongChina

Iron-based nanostructures represent an emerging class of catalysts with high electroactivity for oxygen reduction reaction(ORR)in energy storage and conversion ***,current practical applications have been limited by insufficient durability in both alkaline and acidic *** particular,limited attention has been paid to stabilizing iron-based catalysts by introducing additional metal by the alloying ***,we report bimetallic fe_(2)mo nanoparticles on N-doped carbon(fe_(2)mo/NC)as an efficient and ultra-stable ORR electrocatalyst for the first *** fe_(2)mo/NC catalyst shows high selectivity for a four-electron pathway of ORR and remarkable electrocatalytic activity with high kinetics current density and half-wave potential as well as low Tafel slope in both acidic and alkaline *** demonstrates excellent long-term durability with no activity loss even after 10,000 potential *** functional theory(DFT)calculations have confirmed the modulated electronic structure of formed fe_(2)mo,which supports the electron-rich structure for the ORR ***,the mutual protection between fe and mo sites guarantees efficient electron transfer and long-term stability,especially under the alkaline *** work has supplied an effective strategy to solve the dilemma between high electroactivity and long-term durability for the fe-based electrocatalysts,which opens a new direction of developing novel electrocatalyst systems for future research.

关键词： oxygen reduction reaction fe2mo bimetallic nanoparticles zeolitic imidazolate frameworks(ZIFs) ultralong stability superior oxygen reduction reaction(ORR)performance

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