Mohammadi Tahereh, Asadpour-Zeynali Karim, Majidi Mir Reza, Hosseini Mir Ghasem
Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
Electrochemistry Research Laboratory, Department of Physical Chemistry, Chemistry Faculty, University of Tabriz, Tabriz, Iran.
Heliyon. 2023 Jun 1;9(6):e16888. doi: 10.1016/j.heliyon.2023.e16888. eCollection 2023 Jun.
Bimetallic Ru-Ni nanoparticles was synthesized on the reduced graphene oxide decorated Ni foam (Ru-Ni/rGO/NF) by electroplating method to be utilized as the anode electrocatalyst for direct hydrazine-hydrogen peroxide fuel cells (DHzHPFCs). The synthesized electrocatalysts were characterized by X-ray diffraction, Field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. The electrochemical properties of catalysts towards hydrazine oxidation reaction in an alkaline medium were evaluated by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. In the case of Ru-Ni/rGO/NF electrocatalyst, Ru-Ni provided active sites due to low activation energy (22.24 kJ mol) for hydrazine oxidation reaction and reduced graphene oxide facilitated charge transfer by increasing electroactive surface area (EASA = 677.5 cm) with the small charge transfer resistance (0.1 Ω cm). The CV curves showed that hydrazine oxidation on the synthesized electrocatalysts was a first-order reaction in low concentrations of NH and the number of exchanged electrons was 3.0. In the single cell of the of direct hydrazine-hydrogen peroxide fuel cell, the maximum power density value of Ru-Ni/rGO/NF electrocatalyst was 206 mW cm and the open circuit voltage was 1.73 V at 55 °C. These results proved that the Ru-Ni/rGO/NF is a promising candidate for using as the free-binder anode electrocatalyst in the future application of direct hydrazine-hydrogen peroxide fuel cells due to its excellent structural stability, ease of synthesis, low cost, and high catalytic performance.
通过电镀法在还原氧化石墨烯修饰的泡沫镍（Ru-Ni/rGO/NF）上合成了双金属Ru-Ni纳米颗粒，用作直接肼-过氧化氢燃料电池（DHzHPFCs）的阳极电催化剂。采用X射线衍射、场发射扫描电子显微镜、傅里叶变换红外光谱和拉曼光谱对合成的电催化剂进行了表征。通过循环伏安法、计时电流法和电化学阻抗谱评估了催化剂在碱性介质中对肼氧化反应的电化学性能。对于Ru-Ni/rGO/NF电催化剂，Ru-Ni由于肼氧化反应的低活化能（22.24 kJ mol）而提供了活性位点，还原氧化石墨烯通过增加电活性表面积（EASA = 677.5 cm）和小的电荷转移电阻（0.1 Ω cm）促进了电荷转移。CV曲线表明，在低浓度NH下，合成的电催化剂上的肼氧化是一级反应，交换电子数为3.0。在直接肼-过氧化氢燃料电池的单电池中，Ru-Ni/rGO/NF电催化剂在55°C时的最大功率密度值为206 mW cm，开路电压为1.73 V。这些结果证明，Ru-Ni/rGO/NF由于其优异的结构稳定性、易于合成、低成本和高催化性能，是未来直接肼-过氧化氢燃料电池应用中用作无粘结剂阳极电催化剂的有前途的候选材料。
