塔菲尔方程
过电位
材料科学
电催化剂
静电纺丝
双金属片
催化作用
化学工程
析氧
无机化学
分解水
咪唑酯
钴
锰
纳米纤维
纳米技术
金属
物理化学
电极
复合材料
化学
电化学
冶金
工程类
光催化
生物化学
聚合物
作者
Selvasundarasekar Sam Sankar,T. K. Bijoy,Sangeetha Kumaravel,Arun Karmakar,Ragunath Madhu,Krishnendu Bera,Sreenivasan Nagappan,Hariharan N Dhandapani,Gaber A.M. Mersal,Mohamed M. Ibrahim,D. Sarkar,S. M. Yusuf,Seung‐Cheol Lee,Subrata Kundu
标识
DOI:10.1021/acsami.2c12643
摘要
Finding the active center in a bimetallic zeolite imidazolate framework (ZIF) is highly crucial for the electrocatalytic oxygen evolution reaction (OER). In the present study, we constructed a bimetallic ZIF system with cobalt and manganese metal ions and subjected it to an electrospinning technique for feasible fiber formation. The obtained nanofibers delivered a lower overpotential value of 302 mV at a benchmarking current density of 10 mA cm-2 in an electrocatalytic OER study under alkaline conditions. The obtained Tafel slope and charge-transfer resistance values were 125 mV dec-1 and 4 Ω, respectively. The kinetics of the reaction is mainly attributed from the ratio of metals (Co and Mn) present in the catalyst. Jahn-Teller distortion reveals that the electrocatalytic active center on the Mn-incorporated ZIF-67 nanofibers (Mn-ZIF-67-NFs) was found to be Mn3+ along with the Mn2+ and Co2+ ions on the octahedral and tetrahedral sites, respectively, where Co2+ ions tend to suppress the distortion, which is well supported by density functional theory analysis, molecular orbital study, and magnetic studies.
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