Document Type

Article

Publication Date

2-10-2019

Abstract

The development of economical noble metal-free electrocatalysts for oxygen evolution reaction (OER) with high catalytic activity and durability is crucial for the practical applications of many energy storage and conversion technologies. Here, we report a facile and economical synthesis of Co@CoNx/N-doped carbon tubes hybrid (Co@CoNx/NCT hybrid) via one-step pyrolysis of ZIF-67 at a low temperature of 650 °C with the introduction of urea, which functions as both nitrogen source and promoter of carbon tube growth. The resultant Co@CoNx/NCT hybrid exhibits bamboo-like structure with numerous active sites originated from abundant CoNx species, high nitrogen doping level and topological defects, rendering excellent catalytic activities towards OER in alkaline medium. As a result, the as-obtained Co@CoNx/NCT hybrid shows an overpotential of as low as 290 mV at a current density of 10 mA cm−2 with a small Tafel slope of 60 mV dec−1, which outperforms most noble metal-free electrocatalysts and even commercial IrO2. Therefore, the Co@CoNx/NCT hybrid holds great promise for efficient electrocatalytic water oxidation applications.

Publication Source (Journal or Book title)

Electrochimica Acta

First Page

372

Last Page

378

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