Seamlessly Conductive 3D Nanoarchitecture of Core-Shell Ni-Co Nanowire Network for Highly Efficient Oxygen Evolution

被引:310
作者
Bae, Seok-Hu [1 ]
Kim, Ji-Eun [1 ]
Randriamahazaka, Hyacinthe [2 ]
Moon, Song-Yi [3 ,4 ]
Park, Jeong-Young [3 ,4 ]
Oh, Il-Kwon [1 ]
机构
[1] Korea Adv Inst Sci & Technol, Creat Res Initiat Ctr Functionally Antagonist Nan, Dept Mech Engn, Daehak Ro 291, Daejeon 34141, South Korea
[2] Univ Paris Diderot, Sorbonne Paris Cite, CNRS, ITODYS,UMR 7086, 15 Rue Jean Antoine Baif, F-75205 Paris 13, France
[3] Inst for Basic Sci Korea, Ctr Nanomat & Chem React, Daejeon 34141, South Korea
[4] Korea Adv Inst Sci & Technol, Grad Sch EEWS, Daejeon 34141, South Korea
基金
新加坡国家研究基金会;
关键词
BIFUNCTIONAL ELECTROCATALYST; HIGH-PERFORMANCE; DOPED CARBON; NICKEL METAL; ARRAYS; HYDROXIDE; NANOPARTICLES; OXIDATION; CO3O4; NANOCOMPOSITE;
D O I
10.1002/aenm.201601492
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electrochemical splitting of water is an attractive way to produce hydrogen fuel as a clean and renewable energy source. However, a major challenge is to accelerate the sluggish kinetics of the anodic half-cell reaction where oxygen evolution reaction (OER) takes place. Here, a seamlessly conductive 3D architecture is reported with a carbon-shelled Ni-Co nanowire network as a highly efficient OER electrocatalyst. Highly porous and granular Ni-Co nanowires are first grown on a carbon fiber woven fabric utilizing a cost-effective hydrothermal method and then conductive carbon shell is coated on the Ni-Co nanowires via glucose carbonization and annealing processes. The conductive carbon layer surrounding the nanowires is introduced to provide a continuous pathway for facile electron transport throughout the whole of the integrated 3D catalyst. This 3D hierarchical structure provides several synergistic effects and beneficial functions including a large number of active sites, easy accessibility of water, fast electron transport, rapid release of oxygen gas, enhanced electrochemical durability, and stronger structural integrity, resulting in a remarkable OER activity that delivers an overpotential of 302 mV with a Tafel slope of 43.6 mV dec(-1) at a current density of 10 mA cm(-2) in an alkaline medium electrolyte (1 m KOH).
引用
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页数:11
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