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Bio‐Inspired Leaf‐Mimicking Nanosheet/Nanotube Heterostructure as a Highly Efficient Oxygen Evolution Catalyst

Plant leaves represent a unique 2D/1D heterostructure for enhanced surface reaction and efficient mass transport. Inspired by plant leaves, a 2D/1D CoO(x) heterostructure is developed that is composed of ultrathin CoO(x) nanosheets further assembled into a nanotube structure. This bio‐inspired archi...

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Detalles Bibliográficos
Autores principales: Wang, Yongcheng, Jiang, Kun, Zhang, Hui, Zhou, Tong, Wang, Jiwei, Wei, Wei, Yang, Zhongqin, Sun, Xuhui, Cai, Wen‐Bin, Zheng, Gengfeng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5024083/
https://www.ncbi.nlm.nih.gov/pubmed/27668150
http://dx.doi.org/10.1002/advs.201500003
Descripción
Sumario:Plant leaves represent a unique 2D/1D heterostructure for enhanced surface reaction and efficient mass transport. Inspired by plant leaves, a 2D/1D CoO(x) heterostructure is developed that is composed of ultrathin CoO(x) nanosheets further assembled into a nanotube structure. This bio‐inspired architecture allows a highly active Co(2+) electronic structure for an efficient oxygen evolution reaction (OER) at the atomic scale, ultrahigh surface area (371 m(2) g(−1)) for interfacial electrochemical reaction at the nanoscale, and enhanced transport of charge and electrolyte over CoO(x) nanotube building blocks at the microscale. Consequently, this CoO(x) nanosheet/nanotube heterostructure demonstrates a record‐high OER performance based on cobalt compounds reported so far, with an onset potential of ≈1.46 V versus reversible hydrogen electrode (RHE), a current density of 51.2 mA cm(−2) at 1.65 V versus RHE, and a Tafel slope of 75 mV dec(−1). Using the CoO(x) nanosheet/nanotube catalyst and a Pt‐mesh, a full water splitting cell with a 1.5‐V battery is also demonstrated.