N-doped graphene film-confined nickel nanoparticles as a highly efficient three-dimensional oxygen evolution electrocatalyst
N-doped graphene film-confined nickel nanoparticles as a highly efficient three-dimensional oxygen evolution electrocatalyst
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DOI：
10.1039/c3ee42383b
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发表时间：
2013-12-01
影响因子：
32.5
通讯作者：
Qiao, Shi Zhang
中科院分区：
文献类型：
--
作者：
Chen, Sheng;Duan, Jingjing;Qiao, Shi Zhang
以氮掺杂石墨烯薄膜为骨架，镍纳米颗粒为结构单元，通过非均相反应制备了三维催化剂。这种独特的结构能够实现高催化剂负载量和最佳的电极接触，导致对OER的惊人的高催化活性，其几乎接近最先进的贵重OER电催化剂（IrO 2）的催化活性。此外，催化过程具有良好的电极动力学和长期循环期间的强耐久性。提出了该3D催化剂的双活性中心机理，即，Ni/NiOOH和Ni-N（O）-C都是活性中心。增强的性能归因于N掺杂的石墨烯和Ni的协同效应，其增强了两种组分的OER活性。
A three-dimensional (3D) catalyst was fabricated by using N-doped graphene films as scaffolds and nickel nanoparticles as building blocks via a heterogeneous reaction process. This unique structure enables high catalyst loadings and optimal electrode contact, leading to a surprisingly high catalytic activity towards OER, which almost approaches that of the state-of-the-art precious OER electrocatalysts (IrO2). Moreover, the catalytic process features favourable electrode kinetics and strong durability during long-term cycling. The dual-active-site mechanism was proposed for this 3D catalyst, i.e., Ni/NiOOH and Ni-N(O)-C are both active sites. The enhanced performance is attributed to synergistic effects of N-doped graphene and Ni, which enhance the activities of both components for OER.