碳纳米纤维负载铁钴镍硼化物可控制备及其电催化析氢性能研究

Controllable synthesis of carbon nanofibers with plated FeCoNiB as high performance composite catalysts for electrocatalytic hydrogen evolution

  • 摘要: 通过乙醇催化燃烧法制备了碳纳米纤维(CNFs),采用化学沉积法在CNFs载体上负载铁钴镍硼化物(FeCoNiB),并以多种测试手段对其表征,研究了化学沉积工艺条件对FeCoNiB粒径、分散、成分及结构的影响,建立了碳纳米纤维负载的铁钴镍硼化物(FeCoNiB/CNFs)可控制备方法。采用电化学测试手段研究了FeCoNiB/CNFs在碱性环境下的氢气析出反应(HER)催化性能。结果表明,在100 mA/cm2的电流密度下,FeCoNiB/CNFs的过电位仅为366 mV,塔菲尔斜率低至41 mV/dec;在持续10 h的稳定性测试中电位衰减幅度很小,基本保持不变。这说明FeCoNiB/CNFs制备成本低,但其高稳定性可媲美贵金属的高催化活性HER催化剂;该研究可为非贵金属HER催化剂的研制及低成本电解水制氢技术的规模化应用提供参考。

     

    Abstract: Carbon nanofibers (CNFs) were synthesized by ethanol catalytic combustion method and FeCoNiB was loaded on the CNFs by electroless plating (chemical deposition) method. The effect of electroless plating condition on the particle size, dispersion, composition and structure of FeCoNiB was then investigated, to establish the process for the controllable synthesis of carbon nanofibers with plated FeCoNiB (FeCoNiB/CNFs). In addition, the electrocatalytic performance of FeCoNiB/CNFs was evaluated for the hydrogen evolution reaction (HER) in alkaline environment. The results illustrate that the FeCoNiB/CNFs shows a low overpotential of 366 mV at 100 mA/cm2 and a quite low Tafel slope value of 41 mV/dec, as well as a stable potential without attenuation during the stability test for 10 h, displaying a stable and high catalytic performance that is comparable to that of noble metal catalysts. This study is probably helpful for the development of efficient non-noble metal catalyst for HER as well as the application of large-scale electrolytic water hydrogen production in industry.

     

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