Aftab Tabish, Ferre-Borrull Josep, Marsal Lluis F
Universitat Rovira i Virgili, Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Avinguda Paisos Catalans, 26, Tarragona 43007, Spain.
ACS Omega. 2025 Jun 6;10(23):24618-24627. doi: 10.1021/acsomega.5c01368. eCollection 2025 Jun 17.
This study presents a novel approach for fabricating nickel-based nanorod electrodes with dual electrochemical functionality, bridging supercapacitive and faradaic applications. Using nanoporous anodic alumina (NAA) templates and a pulsed electrodeposition technique, two distinct electrode configurations were engineered from a single presubstrate: nickel nanorods in NAA with partially dissolved pore walls (Ni-NR@NAA) and free-standing nickel nanorods after NAA removal and Ni redeposition (Ni-R-NR@NAA). Structural analysis via field-emission scanning electron microscopy (FESEM) confirmed the uniformity and integrity of the nanorods, while their electrochemical performance was evaluated by cyclic voltammetry (CV). The Ni-NR@NAA electrodes demonstrated the pseudocapacitive performance, achieving a capacitance per unit area of 104 mFcm, which is nearly seven times higher than flat nickel electrodes, attributed to the enhanced active surface area and efficient ion transport. Specific capacitance can reach up to 60 Fg at low scan rates. In contrast, the Ni-R-NR@NAA electrodes exhibited predominantly capacitive behavior with reduced redox activity due to structural modifications. These results emphasize the critical role of nanostructural design in tuning the electrochemical performance, offering a versatile platform for advanced energy storage devices capable of dual supercapacitive and faradaic functionality.
本研究提出了一种制造具有双电化学功能的镍基纳米棒电极的新方法，该方法将超级电容应用和法拉第应用联系起来。利用纳米多孔阳极氧化铝（NAA）模板和脉冲电沉积技术，从单个预衬底设计出两种不同的电极结构：NAA中具有部分溶解孔壁的镍纳米棒（Ni-NR@NAA）以及去除NAA并重新沉积镍后的独立镍纳米棒（Ni-R-NR@NAA）。通过场发射扫描电子显微镜（FESEM）进行的结构分析证实了纳米棒的均匀性和完整性，同时通过循环伏安法（CV）评估了它们的电化学性能。Ni-NR@NAA电极表现出赝电容性能，单位面积电容达到104 mF/cm²，几乎是平面镍电极的七倍，这归因于活性表面积的增加和高效的离子传输。在低扫描速率下，比电容可达60 F/g。相比之下，由于结构改性，Ni-R-NR@NAA电极主要表现出电容行为，氧化还原活性降低。这些结果强调了纳米结构设计在调节电化学性能方面的关键作用，为具有双超级电容和法拉第功能的先进储能器件提供了一个通用平台。
