Core/shell cable-like Ni3S2 nanowires/N-doped graphene-like carbon layers as composite electrocatalyst for overall electrocatalytic water splitting
Core/shell cable-like Ni3S2 nanowires/N-doped graphene-like carbon layers as composite electrocatalyst for overall electrocatalytic water splitting
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DOI：
10.1016/j.cej.2020.126045
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发表时间：
2020-12-01
影响因子：
15.1
通讯作者：
Zhang, Jin Zhong
中科院分区：
文献类型：
--
作者：
Li, Bolin;Li, Zesheng;Zhang, Jin Zhong
基于Ni 3S 2纳米线和泡沫镍上N掺杂的类石墨烯碳层（即Ni3S2@NGCLs/NF）制备了一种新型的核/壳一维纳米结构，并将其作为复合电催化剂应用于析氧反应（OER）、析氢反应（HER）和整体水裂解。Ni3S2@NGCLs具有独特的结构，具有明确的核-壳缆状一维纳米结构，其中NGCLs作为导电壳，Ni 3S 2纳米线作为活性核。该复合材料的氮含量为6.39%（原子比）。Ni3S2@NGCLs/NF在1.0 M KOH中10 mA cm（-2）时的OER和HER分别显示出271 mV和134 mV的低过电位。通过40 h计时电位法和10，000 CV循环测试证明了高度持久的OER和HER性能。在Ni3S2@NGCLs/NF平行双电极体系中发现了优异的整体水裂解电催化活性。特别地，由于多层碳的壳结构减缓了Ni 3S 2的溶解，因此可以在反应过程中可控地形成活性相NiOOH（OER的高活性物质）。理论计算表明，Ni3S2@NGCLs/NF对于HER具有0.51eV的较低Δ G（H*）值，并且对于OER具有0.39V的较低过电位值。这些结果表明，该复合结构是一种很有前途的双功能电催化剂。
A new core/shell 1-D nanostructure based on Ni3S2 nanowires and N-doped graphene-like carbon layers on nickel foam (i.e. Ni3S2@NGCLs/NF) has been fabricated and applied as composite electrocatalyst for oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and overall water splitting. The Ni3S2@NGCLs exhibit a unique architecture with a well-defined core-shell cable-like one-dimensional nanostructure in which NGCLs act as conductive shell and Ni3S2 nanowire as active core. The composite has a nitrogen content of 6.39% in atomic ratio. The Ni3S2@NGCLs/NF shows low overpotentials of 271 mV and 134 mV at 10 mA cm(-2) in 1.0 M KOH for OER and HER, respectively. Highly durable OER and HER performances were demonstrated by 40 h chronopotentiometry and 10,000 CV cycle tests. Excellent overall water splitting electrocatalytic activity was found in a Ni3S2@NGCLs/NF parallel to Ni3S2@NGCLs/NF two-electrode system. Particularly, an active-phase NiOOH, a highly active substance for OER, can be controllably formed in the reaction process due to the shell structure of multi-layer carbon that slows down the dissolution of Ni3S2. Theoretical calculations suggest that Ni3S2@NGCLs/NF has a lower Delta G (H*) value of 0.51 eV for HER and lower overpotential value of 0.39 V for OER. These results suggest that the composite structure is a promising bifunctional electrocatalyst.