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

Advanced Science

Yongcheng Wang²  Kun Jiang²  Hui Zhang³  Tong Zhou¹  Jiwei Wang³  Wei Wei²  Zhongqin Yang¹  Xuhui Sun³  Wen-Bin Cai² 

[1] State Key Laboratory of Surface Physics, Key Laboratory for Computational Physical Sciences (MOE) and Department of Physics, Fudan University, Shanghai, P.R. China;Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center for Energy Materials, Fudan University, Shanghai, P.R. China;Soochow University-Western University Centre for Synchrotron Radiation Research, Institute of Functional Nano and Soft Materials Laboratory (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, P.R. China

关键词: CoOx;    electrocatalyst;    nanosheet;    nanotube;    oxygen evolution reaction;   

DOI  :  10.1002/advs.201500003

来源: Wiley

【 摘 要 】

Abstract

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 Co²⁺ electronic structure for an efficient oxygen evolution reaction (OER) at the atomic scale, ultrahigh surface area (371 m² 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.

【 授权许可】

CC BY   
© 2015 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.