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Synergistic effect of Co–Ni co-bridging with MoS2 nanosheets for enhanced electrocatalytic hydrogen evolution reactions†
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1039/c7ra12692a Ammar Bin Yousaf 1 , Muhammad Imran 2 , Muhammad Farooq 3 , Peter Kasak 1
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1039/c7ra12692a Ammar Bin Yousaf 1 , Muhammad Imran 2 , Muhammad Farooq 3 , Peter Kasak 1
Affiliation
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The depletion of fossil fuels and associated environmental problems have drawn our attention to renewable energy resources in order to meet the global energy demand. Electrocatalytic hydrogen evolution has been considered a potential energy solution due of its high energy density and environment friendly technology. Herein, we have successfully synthesized a noble-metal-free Co–Ni/MoS2 nanocomposite for enhanced electrocatalytic hydrogen evolution. The nanocomposite has been well characterized using HRTEM, elemental mapping, XRD, and XPS analysis. The as-synthesized nanocomposite exhibits a much smaller onset potential and better current density than those of Co–MoS2, Ni–MoS2 and MoS2, with a Tafel value of 49 mV dec−1, which is comparable to that of a commercial Pt/C catalyst. The synergistic effect and interfacial interaction of Co–Ni bimetallic nanoparticles enhances the intrinsic modulation in the electronic structure resulting in an improved HER performance. Moreover, the electrochemical impedance spectroscopic results suggest smaller resistance values for the Co–Ni/MoS2 nanocomposite, compared to those for the charge transfer of bare nanosheets, which increase the faradaic process and in turn enhance the HER kinetics for a better performance. Our as-synthesized Co–Ni/MoS2 nanocomposite holds great potential for the future synthesis of noble-metal-free catalysts.
中文翻译：
Co-Ni 与 MoS2 纳米片共桥联的协同效应增强电催化析氢反应†
化石燃料的枯竭和相关的环境问题引起了我们对可再生能源的关注，以满足全球能源需求。电催化析氢因其高能量密度和环境友好的技术而被认为是一种潜在的能源解决方案。在此，我们成功合成了一种不含贵金属的Co-Ni/MoS 2纳米复合材料，用于增强电催化析氢。该纳米复合材料已通过 HRTEM、元素图、XRD 和 XPS 分析得到了很好的表征。与Co-MoS 2、Ni-MoS 2和MoS 2相比，合成的纳米复合材料表现出更小的起始电位和更好的电流密度，塔菲尔值为49 mV dec -1，与商业化的纳米复合材料相当。 Pt/C催化剂。Co-Ni双金属纳米粒子的协同效应和界面相互作用增强了电子结构的内在调制，从而提高了HER性能。此外，电化学阻抗谱结果表明，与裸纳米片的电荷转移相比，Co-Ni/MoS 2纳米复合材料的电阻值更小，这增加了法拉第过程，进而增强了 HER 动力学以获得更好的性能。我们合成的Co-Ni/MoS 2纳米复合材料对于未来合成不含贵金属的催化剂具有巨大的潜力。
更新日期：2018-01-17
中文翻译：
Co-Ni 与 MoS2 纳米片共桥联的协同效应增强电催化析氢反应†
化石燃料的枯竭和相关的环境问题引起了我们对可再生能源的关注，以满足全球能源需求。电催化析氢因其高能量密度和环境友好的技术而被认为是一种潜在的能源解决方案。在此，我们成功合成了一种不含贵金属的Co-Ni/MoS 2纳米复合材料，用于增强电催化析氢。该纳米复合材料已通过 HRTEM、元素图、XRD 和 XPS 分析得到了很好的表征。与Co-MoS 2、Ni-MoS 2和MoS 2相比，合成的纳米复合材料表现出更小的起始电位和更好的电流密度，塔菲尔值为49 mV dec -1，与商业化的纳米复合材料相当。 Pt/C催化剂。Co-Ni双金属纳米粒子的协同效应和界面相互作用增强了电子结构的内在调制，从而提高了HER性能。此外，电化学阻抗谱结果表明，与裸纳米片的电荷转移相比，Co-Ni/MoS 2纳米复合材料的电阻值更小，这增加了法拉第过程，进而增强了 HER 动力学以获得更好的性能。我们合成的Co-Ni/MoS 2纳米复合材料对于未来合成不含贵金属的催化剂具有巨大的潜力。
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