Zhu Pengcheng, Lyu Dandan, Shen Pei Kang
Collaborative Innovation Center of Sustainable Energy Materials, Guangxi University Nanning 530004 P. R. China.
Guangxi Key Laboratory of Electrochemical Energy Materials, Guangxi University Nanning 530004 P. R. China.
RSC Adv. 2018 Dec 6;8(71):40866-40872. doi: 10.1039/c8ra08922a. eCollection 2018 Dec 4.
Research into the preparation and application of metal/graphene nanocomposite materials is an important issue in the field of graphene applications. Metal nanomaterials and graphene materials have many excellent properties and have been perfectly combined into metal/graphene nanocomposite materials. These offer the high catalytic activity of metal nanomaterials and the high specific surface area and favorable electrical conductivity of graphene. The unique advantages can produce synergistic effects and can significantly improve the overall performance of the composite materials. This gives the metal/graphene nanocomposite materials excellent application prospects for hydrogen evolution. Here, we report the preparation of yttrium-doped palladium/iron on graphene (Pd/YFeO/C) using a simple and efficient method. The catalytic performance of the Pd/YFeO/C nanocomposites for water electrolysis and hydrogen production was evaluated. The results show that the overpotential for the hydrogen evolution reaction at -10 mA cm is only 15 mV, which is competitive with Pt/C catalysts. The Pd/YFeO/C is highly active for hydrogen evolution with an onset potential of -8 mV in 0.5 M HSO solution and a Tafel slope of 37 mV dec with a Pd loading of only 20 μg cm. These results clearly demonstrated that Pd/YFeO/C is an excellent catalyst for hydrogen evolution.
金属/石墨烯纳米复合材料的制备与应用研究是石墨烯应用领域的一个重要课题。金属纳米材料和石墨烯材料具有许多优异性能，并已完美结合形成金属/石墨烯纳米复合材料。这些复合材料兼具金属纳米材料的高催化活性以及石墨烯的高比表面积和良好导电性。其独特优势能够产生协同效应，显著提升复合材料的整体性能。这赋予了金属/石墨烯纳米复合材料优异的析氢应用前景。在此，我们报道了一种利用简单高效方法在石墨烯上制备钇掺杂钯/铁（Pd/YFeO/C）的过程。对Pd/YFeO/C纳米复合材料的水电解制氢催化性能进行了评估。结果表明，在-10 mA cm时析氢反应的过电位仅为15 mV，与Pt/C催化剂相当。在0.5 M HSO溶液中，Pd/YFeO/C具有高析氢活性，起始电位为-8 mV，塔菲尔斜率为37 mV dec，钯负载量仅为20 μg cm。这些结果清楚地表明Pd/YFeO/C是一种优异的析氢催化剂。
