Abbas Syed Asad, Kim Seong-Hoon, Iqbal Muhammad Ibrahim, Muhammad Shoaib, Yoon Won-Sub, Jung Kwang-Deog
Center for Clean Energy and Chemical Engineering, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 136-791, Republic of Korea.
Clean Energy and Chemical Engineering, University of Science and Technology, 217 Gajeong-ro Yuseong-gu, Daejeon, Republic of Korea.
Sci Rep. 2018 Feb 14;8(1):2986. doi: 10.1038/s41598-018-21396-9.
The design of active, stable, and cost-effective electrocatalysts for the H evolution reaction (HER) in alkaline conditions is important for electrochemical systems such as the chloro-alkaline process and H production. Here we report catalysts comprising Pt on Ni single crystalline spines (Pt/Ni-SP) with high activity and stability for HER in alkaline solution with proposed mechanism. The Pt/Ni-SP catalysts are prepared by dispersing platinum nanoparticles (1.7-3.1 nm) on the single-crystalline spines (Ni-SP) of Ni urchin-like particles. The size and coverage of Pt nanoparticles on Ni-SP are increased with increases in the Pt loading amount. X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy are performed to observe the structure of the Pt/Ni-SP catalyst. The catalysts achieve the mass activity of 1.11 A mg, comparing favorably to Pt/C catalysts with the mass activity of 0.33 A mg at 0.05 V overpotential. The Tafel slope of the Pt/Ni-SP catalyst is approximately 30 mV dec, similar to that of Pt, while Pt/Ni-SP is very stable in alkaline solution, like Ni. The synergistic effect of Pt/Ni-SP is ascribed to H spillover from Pt to Ni.
设计在碱性条件下用于析氢反应（HER）的活性高、稳定性好且成本效益高的电催化剂，对于氯碱工艺和制氢等电化学系统而言至关重要。在此，我们报告了一种由铂负载在镍单晶刺上组成的催化剂（Pt/Ni-SP），该催化剂在碱性溶液中对HER具有高活性和稳定性，并提出了其作用机理。Pt/Ni-SP催化剂是通过将铂纳米颗粒（1.7 - 3.1纳米）分散在镍类海胆状颗粒的单晶刺（Ni-SP）上制备而成。随着铂负载量的增加，Pt纳米颗粒在Ni-SP上的尺寸和覆盖率也会增加。通过X射线衍射、高分辨率透射电子显微镜、X射线光电子能谱和X射线吸收光谱对Pt/Ni-SP催化剂的结构进行了观察。在过电位为0.05 V时，该催化剂的质量活性达到1.11 A mg，优于质量活性为0.33 A mg的Pt/C催化剂。Pt/Ni-SP催化剂的塔菲尔斜率约为30 mV dec，与Pt的相近，而Pt/Ni-SP在碱性溶液中非常稳定，与Ni类似。Pt/Ni-SP的协同效应归因于氢从Pt溢流到Ni。
