过电位
煅烧
材料科学
催化作用
氧化物
化学工程
尖晶石
析氧
钴
氧化钴
过渡金属
分解水
多孔性
烧结
无机化学
电极
冶金
化学
电化学
物理化学
复合材料
光催化
工程类
生物化学
作者
Patrick Guggenberger,Tatiana Priamushko,Prathamesh Patil,Justyna Florek,Daniel Garstenauer,Andreas Mautner,Jae Won Shin,Ryong Ryoo,Christian M. Pichler,Freddy Kleitz
标识
DOI:10.1016/j.jcis.2024.01.056
摘要
The controlled cation substitution is an effective strategy for optimizing the density of states and enhancing the electrocatalytic activity of transition metal oxide catalysts for water splitting. However, achieving tailored mesoporosity while maintaining elemental homogeneity and phase purity remains a significant challenge, especially when aiming for complex multi-metal oxides. In this study, we utilized a one-step impregnation nanocasting method for synthesizing mesoporous Mn-, Fe-, and Ni-substituted cobalt spinel oxide (Mn0.1Fe0.1Ni0.3Co2.5O4, MFNCO) and demonstrate the benefits of low-temperature calcination within a semi-sealed container at 150–200 °C. The comprehensive discussion of calcination temperature effects on porosity, particle size, surface chemistry and catalytic performance for the alkaline oxygen evolution reaction (OER) highlights the importance of humidity, which was modulated by a pre-drying step. The catalyst calcined at 170 °C exhibited the lowest overpotential (335 mV at 10 mA cm−2), highest current density (433 mA cm−2 at 1.7 V vs. RHE, reversible hydrogen electrode) and further displayed excellent stability over 22 h (at 10 mA cm−2). Furthermore, we successfully adapted this method to utilize cheap, commercially available silica gel as a hard template, yielding comparable OER performance. Our results represent a significant advance in the cost-efficient large-scale preparation of complex multi-metal oxides for catalytic applications.
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