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Direct chemical synthesis of ultrathin holey iron doped cobalt oxide nanosheets on nickel foam for oxygen evolution reaction
Nano Energy ( IF 16.8 ) Pub Date : 2018-10-17 , DOI: 10.1016/j.nanoen.2018.10.032
Ying Li , Fu-Min Li , Xin-Ying Meng , Xin-Ru Wu , Shu-Ni Li , Yu Chen

The oxygen evolution reaction (OER) on the anode is a vital electrocatalytic reaction in the field of energy conversion. Currently, transition metals-based nanomaterials are promising Ir/Ru-alternative OER electrocatalysts in alkaline media. In this work, we report that in-situ direct growth of atomically thick Fe doped Co3O4 holey nanosheets on nickel foam (Fe-Co3O4 H-NSs/NF) using a simple cyanogel−NaBH4 route, which effectively avoids the tedious post-etch process of nanosheets using plasma, acid, alkali, and so on. Benefiting from ultrathin thickness (1.5 nm), numerous holes, and synergistic effect between Co and Fe atoms, Fe-Co3O4 H-NSs/NF provide a large specific surface area (199.12 m2 g−1) and highly active catalytic sites for the OER. Meanwhile, nickel foam substrate with three-dimensionally porous structure and high conductivity accelerates molecules/ions/gases transportation and electron transfer. Consequently, Fe-Co3O4 H-NSs/NF with optimal Co/Fe composition show super electrocatalytic performance for the OER, including an overpotential as small as ∼204 mV at 10 mA cm−2 current density and a small Tafel slope of 38 mV dec−1, which is much better than commercial RuO2 nanoparticles.



中文翻译:

在镍泡沫上直接化学合成超薄多孔铁掺杂钴氧化物纳米片用于氧释放反应

阳极上的氧释放反应(OER)在能量转换领域是至关重要的电催化反应。当前,基于过渡金属的纳米材料在碱性介质中有望成为Ir / Ru替代OER电催化剂。在这项工作中,我们报道了使用简单的氰基凝胶-NaBH 4途径在镍泡沫(Fe-Co 3 O 4 H-NSs / NF)上原位直接生长原子掺杂的Fe掺杂的Co 3 O 4多孔纳米片。避免了使用等离子,酸,碱等进行繁琐的纳米片后蚀刻过程。受益于超薄厚度(1.5 nm),大量孔洞以及Co和Fe原子,Fe-Co 3 O 4之间的协同效应H-NSs / NF为OER提供了大的比表面积(199.12 m 2 g -1)和高活性的催化位。同时,具有三维多孔结构和高电导率的泡沫镍基材可加速分子/离子/气体的传输和电子转移。因此,具有最佳Co / Fe组成的Fe-Co 3 O 4 H-NSs / NF对OER表现出超强的电催化性能,包括在10 mA cm -2的电流密度下低至〜204 mV的过电势和小的Tafel斜率。 38 mV dec -1,比市售RuO 2纳米粒子好得多。

更新日期:2018-10-17
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