Quasi-1D Mn2O3 Nanostructures Functionalized with First-Row Transition-Metal Oxides as Oxygen Evolution Catalysts,ACS Applied Nano Materials

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Quasi-1D Mn2O3 Nanostructures Functionalized with First-Row Transition-Metal Oxides as Oxygen Evolution Catalysts
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-09-03 , DOI: 10.1021/acsanm.0c01951
Lorenzo Bigiani ₁ , Chiara Maccato ₁ , Teresa Andreu _{2,

3} , Alberto Gasparotto ₁ , Cinzia Sada ₄ , Evgeny Modin ₅ , Oleg I. Lebedev ₆ , Joan Ramon Morante _{2,

3} , Davide Barreca ₇

Affiliation

The development of cheap and efficient catalysts for the oxygen evolution reaction (OER) plays a critical role for sustainable energy conversion and storage. Herein, we report on Mn₂O₃-based systems supported on nickel foams and functionalized with first-row transition-metal (Fe, Co, Ni) oxide nanoparticles (NPs) as OER electrocatalysts in alkaline media, fabricated by a plasma-assisted process. The remarkable substrate porosity and high Mn₂O₃ active area, due to the quasi-one-dimensional nano-organization, enabled an efficient ultradispersion of Fe₂O₃, Co₃O₄, and NiO NPs into Mn₂O₃ and an intimate oxide–oxide interfacial contact, enhancing thus charge carrier transport and facilitating reactants and products diffusion. Among the developed systems, Fe₂O₃–Mn₂O₃ yielded the highest electrocatalytic activity, corresponding to a low overpotential of ∼350 mV at 10 mA × cm^–2 and a Tafel slope of 70 mV × dec^–1, allowing high current density values. The obtained performances, discussed in relation to the material properties, are superior to almost all the state-of-the-art manganese oxide catalysts and compare favorably with various noble-metal-based systems, paving the way to additional activity improvements via compositional and interfacial engineering.

中文翻译：

用第一行过渡金属氧化物作为氧气逸出催化剂功能化的准一维Mn ₂ O ₃纳米结构

氧气释放反应（OER）的廉价，高效催化剂的开发对于可持续的能源转化和存储起着至关重要的作用。本文中，我们报道了在镍泡沫上负载并以等离子辅助制备的第一行过渡金属（Fe，Co，Ni）氧化物纳米颗粒（NPs）作为碱性介质中的OER电催化剂进行了功能化的Mn ₂ O ₃基体系。处理。由于具有准一维纳米结构，因此具有显着的基材孔隙率和较高的Mn ₂ O ₃活性面积，可将Fe ₂ O ₃，Co ₃ O ₄和NiO NP有效地超分散到Mn ₂ O _3中以及紧密的氧化物-氧化物界面接触，从而增强了电荷载流子的传输并促进了反应物和产物的扩散。在已开发的系统中，Fe ₂ O ₃ -Mn ₂ O ₃产生最高的电催化活性，对应于10 mA×cm ^–2时低至〜350 mV的低电势和70 mV×dec ^–1的Tafel斜率，允许高当前密度值。就材料性能而言，所获得的性能几乎优于所有最新的锰氧化物催化剂，并且与各种基于贵金属的体系相媲美，从而为通过成分和化学性质改善活性提供了基础界面工程。

更新日期：2020-10-25

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