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NiCo层状双氢氧化物负载痕量Pt的催化析氢研究

陈旭芳 李杨 陈荣生 倪红卫

陈旭芳, 李杨, 陈荣生, 倪红卫. NiCo层状双氢氧化物负载痕量Pt的催化析氢研究[J]. 工程科学学报. doi: 10.13374/j.issn2095-9389.2021.01.05.003
引用本文: 陈旭芳, 李杨, 陈荣生, 倪红卫. NiCo层状双氢氧化物负载痕量Pt的催化析氢研究[J]. 工程科学学报. doi: 10.13374/j.issn2095-9389.2021.01.05.003
CHEN Xu-fang, LI Yang, CHEN Rong-sheng, NI Hong-wei. NiCo-layered double hydroxides embedded with trace platinum species for boosting alkaline hydrogen evolution reaction[J]. Chinese Journal of Engineering. doi: 10.13374/j.issn2095-9389.2021.01.05.003
Citation: CHEN Xu-fang, LI Yang, CHEN Rong-sheng, NI Hong-wei. NiCo-layered double hydroxides embedded with trace platinum species for boosting alkaline hydrogen evolution reaction[J]. Chinese Journal of Engineering. doi: 10.13374/j.issn2095-9389.2021.01.05.003

NiCo层状双氢氧化物负载痕量Pt的催化析氢研究

doi: 10.13374/j.issn2095-9389.2021.01.05.003
基金项目: 国家自然科学基金资助项目(51471122)
详细信息
    通讯作者:

    E-mail: nihongwei@wust.edu.cn

  • 中图分类号: O613

NiCo-layered double hydroxides embedded with trace platinum species for boosting alkaline hydrogen evolution reaction

More Information
  • 摘要: 降低铂的用量,提升铂基催化剂在碱性环境中的析氢反应性能,是电解水工业化应用的一个关键问题。本工作是在三电极体系中,以Pt丝对电极为Pt源,采用简单易于控制的循环伏安(Cyclic voltammetry, CV)电化学沉积方法,在水热制备的镍钴层状双氢氧化物(NiCo-LDHs)上实现了高分散Pt的痕量负载。利用NiCo-LDHs促进水的解离,Pt位点推动H的结合和脱附,有效解决Pt在碱性环境中析氢反应过程动力学滞缓的问题。在1 mol·L−1 KOH溶液中,在Pt负载量为30.4 g·cm−2时,Pt‒NiCo-LDHs电极驱动10 mA·cm−2电流密度的过电位仅需要56 mV,塔菲尔斜率仅为43 mV·decade−1,摆脱了Volmer步骤的限制,展现了优异的析氢催化活性。在100 mV的过电位下,Pt‒NiCo-LDHs的质量活性比商品化Pt/C电极高5.6倍。另外,Pt‒NiCo-LDHs在100 h的恒电流测试中表现出了良好的稳定性。

     

  • 图  1  NiCo-LDHs/NF(a~b)和Pt‒NiCo-LDHs/NF(c~d)的扫描电镜图

    Figure  1.  SEM images of NiCo-LDHs (a–b) and Pt‒NiCo-LDHs/NF (c–d)

    图  2  Pt‒NiCo-LDHs/NF的低倍透射电子显微镜图(a)、与之相对的选区电子衍射图(b)、高倍透射电子显微镜图(c),相应的能量色散光谱元素映射分析图(d~e)

    Figure  2.  TEM images of Pt‒NiCo-LDHs (a, c) and corresponding SAED patterns (b), corresponding EDS elemental mapping analysis of Pt‒NiCo-LDHs (d–e)

    图  3  NiCo-LDHs/NF和Pt‒NiCo-LDHs/NF的X射线衍射图谱和X射线光电子能谱分析图谱。(a) X射线衍射图谱;(b)X射线光电子能谱全能谱图;(c) Ni 2p;(d) Co 2p;(e) O 1s及(f) Pt 4f

    Figure  3.  (a) XRD patterns of NiCo-LDHs/NF and Pt‒NiCo-LDHs/NF; XPS spectra of (b) the survey scan, (c) Ni 2p, (d) Co 2p, and (e) O 1s for NiCo-LDHs/NF and Pt‒NiCo-LDHs/NF; (f) Pt 4f for Pt‒NiCo-LDHs

    图  4  样品在1 mol·L-1 KOH溶液中的循环伏安曲线图(a),析氢极化曲线图(b)及其相对应的塔菲尔斜率图(c)、电化学阻抗谱图(d)、单位面积双电层电容值(e)及Pt‒NiCo-LDHs/NF在10 mA cm-2的稳定性测试图(f)

    Figure  4.  CV curves (a) and polarization curves (b) of samples, and Tafel plots (c), Nyquist plots (d), scan-rate dependence of the mean capacitive currents (e) for different catalysts and Chronoamperometric curves for Pt‒NiCo-LDHs (f)

    图  5  Pt在NiCo-LDHs/NF表面的沉积过程(a),Pt‒NiCo-LDHs与Pt/C催化剂关于Pt的质量负载对比图(b)及质量活性对比图(c)

    Figure  5.  Pt deposition process on the surface of NiCo-LDHs/NF (a), mass loading comparison diagram (b) and mass activity comparison diagram (c) of Pt‒NiCo-LDHs and Pt/C catalysts

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  • 收稿日期:  2021-01-05
  • 网络出版日期:  2021-06-18

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