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论文类型：期刊论文

发表时间：2017-11-01

发表刊物：CHEMICAL ENGINEERING JOURNAL

收录刊物：SCIE、EI

卷号：327

页面范围：9-17

ISSN号：1385-8947

关键字：Ni-Co hydroxides; Oxygen evolution reaction; Lithium ion battery; Graphene; Electrodeposition

摘要：Ultrathin graphene wrapped Ni-Co double hydroxide nanosheets (similar to 10 nm) were synthesized by a facile and rapid electrodeposition process, and evaluated as electrocatalysts for oxygen evolution reaction (OER) and anode materials for Li-ion batteries. The conformal graphene coating on the nanosheets significantly increased the conductivity and surface area of the Ni-Co double hydroxide electrodes. As the OER electrocatalyst, the Ni-Co graphene hybrids show a superior catalytic activity with a small Tafel slope of 67 mV per decade due to the synergy between the abundant active sites of the Ni-Co hydroxides and the conductive graphene coating, and a modest overpotential of 280 mV at a current density of 10 mA cm(-2). Impressively, the electrodes exhibit an excellent stability evaluated by chronopotentiometry under a high current density of 30 mA cm(-2) for 12 h. As Li-ion battery anode, the materials show a high specific capacity of 373 mA h g(-1) up to 500 cycles even at a high current density of 1000 mA g(-1). This study provides a new strategy to develop robust and affordable alternative OER catalyst and anode material for high-performance lithium ion batteries. (C) 2017 Elsevier B.V. All rights reserved.