Polymer-Embedded Fabrication of Co2P Nanoparticles Encapsulated in N,P-Doped Graphene for Hydrogen Generation

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• 作者：Minghao Zhuang ; Xuewu Ou ; Yubing Dou ; Lulu Zhang ; Qicheng Zhang ; Ruizhe Wu ; Yao Ding ; Minhua Shao ; Zhengtang Luo
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：16
• 期：7
• 页码：4691-4698
• 全文大小：607K
• 年卷期：0
• ISSN：1530-6992

文摘

We developed a method to engineer well-distributed dicobalt phosphide (Co₂P) nanoparticles encapsulated in N,P-doped graphene (Co₂P@NPG) as electrocatalysts for hydrogen evolution reaction (HER). We fabricated such nanostructure by the absorption of initiator and functional monomers, including acrylamide and phytic acid on graphene oxides, followed by UV-initiated polymerization, then by adsorption of cobalt ions and finally calcination to form N,P-doped graphene structures. Our experimental results show significantly enhanced performance for such engineered nanostructures due to the synergistic effect from nanoparticles encapsulation and nitrogen and phosphorus doping on graphene structures. The obtained Co₂P@NPG modified cathode exhibits small overpotentials of only −45 mV at 1 mA cm^–2, respectively, with a low Tafel slope of 58 mV dec^–1 and high exchange current density of 0.21 mA cm^–2 in 0.5 M H₂SO₄. In addition, encapsulation by N,P-doped graphene effectively prevent nanoparticle from corrosion, exhibiting nearly unfading catalytic performance after 30 h testing. This versatile method also opens a door for unprecedented design and fabrication of novel low-cost metal phosphide electrocatalysts encapsulated by graphene.