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Three-dimensional porous Ni-CNT composite nanocones as high performance electrocatalysts for hydrogen evolution reaction
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2018-11-01 , DOI: 10.1016/j.jelechem.2018.10.012
Gh. Barati Darband , M. Aliofkhazraei , A. Sabour Rouhaghdam

Abstract In this study, a new 3D hierarchical Ni-CNT nanostructure was fabricated using electrodeposition method in a bath containing crystal modifier, where its electrocatalytic activity and stability for hydrogen evolution reaction (HER) were investigated. The resulting Ni-CNT nanostructures were characterized by different analysis such as XRD, SEM, EDS and AFM. The electrocatalytic activity, stability and corrosion resistance of the fabricated Ni-CNT as cathode for the HER in 1.0 M potassium hydroxide (KOH) solution were investigated by LSV curves, CV and EIS techniques. The results indicated highly active surface area as well as increased electrical conductivity owing to introduction of CNT into the Ni nanocones (NNCs) improving intrinsic catalytic activity for HER. Furthermore, due to their hierarchical structure, the Ni-CNT nanostructure facilities bubble detachment, effectively reducing the dead area resulted from bubbles phenomena. These two features are beneficial for high activity and stability during HER. This electrode able to afford current densities of 10, 20 and 100 mA/cm2 at the HER overpotentials of 82 and 116 and 207 mV, respectively. High chemical stability of CNT leads to an increase in the electrocatalytic stability and corrosion resistance of Ni-CNT hierarchical nanostructure. This research introduces the novel 3D nanocomposite structure for enhancing electrocatalytic activity for HER.

中文翻译:

三维多孔Ni-CNT复合纳米锥作为析氢反应的高性能电催化剂

摘要 在本研究中,采用电沉积方法在含有晶体改性剂的浴槽中制备了一种新型 3D 分层 Ni-CNT 纳米结构,并研究了其电催化活性和析氢反应 (HER) 的稳定性。所得的 Ni-CNT 纳米结构通过不同的分析进行表征,例如 XRD、SEM、EDS 和 AFM。通过 LSV 曲线、CV 和 EIS 技术研究了制备的 Ni-CNT 作为 HER 阴极在 1.0 M 氢氧化钾 (KOH) 溶液中的电催化活性、稳定性和耐腐蚀性。结果表明,由于将 CNT 引入 Ni 纳米锥 (NNC),提高了 HER 的内在催化活性,因此具有高活性表面积和增加的电导率。此外,由于它们的层次结构,Ni-CNT纳米结构有助于气泡脱离,有效减少气泡现象造成的死区。这两个特征有利于HER期间的高活性和稳定性。该电极能够在 HER 过电位分别为 82、116 和 207 mV 时提供 10、20 和 100 mA/cm2 的电流密度。CNT的高化学稳定性导致Ni-CNT分级纳米结构的电催化稳定性和耐腐蚀性的增加。本研究介绍了用于增强 HER 电催化活性的新型 3D 纳米复合结构。在 HER 过电位分别为 82、116 和 207 mV 时,分别为 20 和 100 mA/cm2。CNT的高化学稳定性导致Ni-CNT分级纳米结构的电催化稳定性和耐腐蚀性的增加。本研究介绍了用于增强 HER 电催化活性的新型 3D 纳米复合结构。在 HER 过电位分别为 82、116 和 207 mV 时,分别为 20 和 100 mA/cm2。CNT的高化学稳定性导致Ni-CNT分级纳米结构的电催化稳定性和耐腐蚀性的增加。本研究介绍了用于增强 HER 电催化活性的新型 3D 纳米复合结构。
更新日期:2018-11-01
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