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首页> 外文期刊>Advanced Functional Materials >Bifunctional Nickel Phosphide Nanocatalysts Supported on Carbon Fiber Paper for Highly Effi cient and Stable Overall Water Splitting
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Bifunctional Nickel Phosphide Nanocatalysts Supported on Carbon Fiber Paper for Highly Effi cient and Stable Overall Water Splitting

机译：碳纤维纸上负载的双功能磷化镍纳米催化剂可实现高效稳定的总水分解

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摘要

Self-supported electrodes comprising carbon fiber paper (CP) integrated with bifunctional nickel phosphide (Ni-P) electrocatalysts are fabricated by electrodeposition of Ni on functionalized CP, followed by a convenient one-step phosphorization treatment in phosphorus vapor at 500 degrees C. The as-fabricated CP@Ni-P electrode exhibits excellent electrocatalytic performance toward hydrogen evolution in both acidic and alkaline solutions, with only small overpotentials of 162 and 250 mV, respectively, attaining a cathodic current density of 100 mA cm(-2). Furthermore, the CP@Ni-P electrode also exhibits superior catalytic performance toward oxygen evolution reaction (OER). An exceptionally high OER current of 50.4 mA cm(-2) is achieved at an overpotential of 0.3 V in 1.0 M KOH. The electrode can sustain 10 mA cm(-2) for 180 h with only negligible degradation, showing outstanding durability. Detailed microstructural and compositional studies reveal that upon OER in alkaline solution the surface Ni-P is transformed to NiO covered with a thin Ni(OH)(x) layer, forming a Ni-P/NiO/Ni(OH)(x) heterojunction, which presumably enhances the electrocatalytic performance for OER. Given the well-defi ned bifunctionality, a full alkaline electrolyzer is constructed using two identical CP@Ni-P electrodes as cathode and anode, respectively, which can realize overall water splitting with effi ciency as high as 91.0% at 10 mA cm(-2) for 100 h.
机译：通过将Ni电沉积在功能化CP上，然后在500℃的磷蒸气中进行方便的一步式磷化处理，制得包含碳纤维纸（CP）和双功能磷化镍（Ni-P）电催化剂的自支撑电极。刚制造的CP @ Ni-P电极在酸性和碱性溶液中均表现出优异的对氢析出的电催化性能，只有小的过电势分别为162和250 mV，阴极电流密度为100 mA cm（-2）。此外，CP @ Ni-P电极还对氧气析出反应（OER）表现出优异的催化性能。在1.0 M KOH中的0.3 V过电势下，可获得50.4 mA cm（-2）的极高OER电流。电极可以维持10 mA cm（-2）的温度达180小时，而降解几乎可以忽略不计，显示出出色的耐久性。详细的微观结构和组成研究表明，在碱性溶液中进行OER处理后，表面Ni-P转变为覆盖有薄Ni（OH）（x）层的NiO，形成Ni-P / NiO / Ni（OH）（x）异质结，据推测可以增强OER的电催化性能。鉴于已明确定义的双功能性，使用两个相同的CP @ Ni-P电极分别作为正极和负极构造了一个全碱性电解槽，在10 mA cm（-）时可以实现高达91.0％的总水分解效率（- 2）100小时。

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  • 来源
    《Advanced Functional Materials》 |2016年第23期|4067-4077|共11页
  • 作者

    Wang Xiaoguang; Li Wei; Xiong Dehua; Petrovykh Dmitri Y.; Liu Lifeng;

  • 作者单位

    Int Iberian Nanotechnol Lab INL, Ave Mestre Jose Veiga, P-4715330 Braga, Portugal;

    Int Iberian Nanotechnol Lab INL, Ave Mestre Jose Veiga, P-4715330 Braga, Portugal;

    Int Iberian Nanotechnol Lab INL, Ave Mestre Jose Veiga, P-4715330 Braga, Portugal;

    Int Iberian Nanotechnol Lab INL, Ave Mestre Jose Veiga, P-4715330 Braga, Portugal;

    Int Iberian Nanotechnol Lab INL, Ave Mestre Jose Veiga, P-4715330 Braga, Portugal;

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