塔菲尔方程
材料科学
析氧
过电位
镍
催化作用
化学工程
阳极
钴
氧化钴
纳米颗粒
分解水
纳米材料
电催化剂
纳米技术
无机化学
电化学
电极
冶金
化学
光催化
物理化学
工程类
生物化学
作者
Ying Liu,Fu-Min Li,Xin‐Ying Meng,Xin‐Tao Wu,Shu-Ni Li,Yu Chen
出处
期刊:Nano Energy
[Elsevier]
日期:2018-12-01
卷期号:54: 238-250
被引量:108
标识
DOI:10.1016/j.nanoen.2018.10.032
摘要
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.
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