Askari Mohammad Bagher, Tourchi Moghadam Mohammad Taghi, Salarizadeh Parisa
Department of Semiconductor, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
Faculty of Electronics, Telecommunications and Informatics, and Advanced Materials Centre, Gdansk University of Technology, Ul. Narutowicza 11/12, 80-223, Gdansk, Poland.
Heliyon. 2024 Oct 15;10(20):e39399. doi: 10.1016/j.heliyon.2024.e39399. eCollection 2024 Oct 30.
A nanocomposite made of nickel oxide and iron oxide (NiO/FeO) and its hybrid with reduced graphene oxide (rGO) as a conductive substrate with a highly functional surface (NiO/FeO/rGO) was synthesized using a simple hydrothermal approach. This study addresses the challenge of developing efficient materials for energy storage and alcohol fuel cells. After confirming the synthesis through structural analysis, the potential of these nanocomposites as supercapacitor electrodes and catalysts for methanol and ethanol oxidation in alcohol fuel cells were evaluated. The synergy of combining the two metal oxides and adding rGO to the composite structure led to excellent electrocatalytic activity in alcohol oxidation. For the modified NiO/FeO/rGO electrode in the methanol oxidation reaction (MOR), a current density of 450 mA/cm at 0.67 V and excellent catalyst stability of 98.7 % over 20 h in chronoamperometric analysis were observed. In the ethanol oxidation reaction (EOR), an oxidative current of 235 mA/cm at a peak potential of 0.76 V was seen, with catalyst stability of 96.4 % after 20 h. As a supercapacitor electrode, the NiO/FeO composite demonstrated a specific capacitance of 946 F/g, while NiO/FeO/rGO showed 1155 F/g. The stability of these electrodes after 10000 GCD cycles was 83.6 % and 90.6 %, respectively. These findings suggest that the proposed structures are cost-effective and reliable alternatives for energy storage and production, suitable for alcohol fuel cells and supercapacitors.
采用简单的水热法合成了由氧化镍和氧化铁制成的纳米复合材料（NiO/FeO）及其与还原氧化石墨烯（rGO）的杂化物，作为具有高功能表面的导电基底（NiO/FeO/rGO）。本研究解决了开发用于能量存储和酒精燃料电池的高效材料这一挑战。通过结构分析确认合成后，评估了这些纳米复合材料作为超级电容器电极以及酒精燃料电池中甲醇和乙醇氧化催化剂的潜力。两种金属氧化物的结合以及在复合结构中添加rGO的协同作用导致了在酒精氧化中具有优异的电催化活性。对于甲醇氧化反应（MOR）中的改性NiO/FeO/rGO电极，在计时电流分析中，在0.67 V时观察到电流密度为450 mA/cm²，并且在20小时内具有98.7%的优异催化剂稳定性。在乙醇氧化反应（EOR）中，在峰值电位0.76 V时观察到氧化电流为235 mA/cm²，20小时后催化剂稳定性为96.4%。作为超级电容器电极，NiO/FeO复合材料的比电容为946 F/g，而NiO/FeO/rGO为1155 F/g。这些电极在10000次恒流充放电循环后的稳定性分别为83.6%和90.6%。这些发现表明，所提出的结构是用于能量存储和生产的具有成本效益且可靠的替代方案，适用于酒精燃料电池和超级电容器。
