Versailles Santa Barbara-5 (VSB-5) is a prominent example of nanoporous nickel-based materials for energy storage applications due to their high theoretical specific capacitance, thermal and chemical stability, and ease of synthesis. Yet, improving the electrochemical properties of VSB-5 for high-performance supercapacitors remains in high interest to exceed the current state-of-the-art. This work demonstrates the effect of different calcination temperatures of nickel phosphate (NiP) VSB-5 on its structure, morphology, and electrochemical performances. NiP VSB-5 was synthesized via hydrothermal technique followed by calcination at 300 °C (NiP-300), 400 °C (NiP-400), 500 °C (NiP-500), 600 °C (NiP-600), 700 °C (NiP-700), and 800 °C (NiP-800). Interestingly, the calcination temperatures induce the crystal-amorphous phase change and affect the diameter size of the NiP VSB-5 rod structure. The NiP-600 delivers the highest specific capacity of 516 C g−1 at 0.62 A g−1 compared to as-synthesized VSB-5 (31.4 C g−1), NiP-300 (103 C g−1), NiP-400 (189 C g−1), NiP-500 (279 C g−1), NiP-700 (396 C g−1), and NiP-800 (0.97 C g−1). The high specific capacity of NiP-600 is triggered by the amorphous phase and smaller particle diameter size, which provide abundant active sites for redox reactions. Furthermore, we assembled the best performing NiP-600 as the cathode and activated carbon (AC) as the anode into an asymmetric supercapacitor (SC). The NiP-600//AC-based supercapacitors achieved a remarkable energy density of 52 Wh kg−1 at a power density of 434 W kg−1, which is superior to several reported nickel phosphate-based SC. The SC can maintain 71 % of original capacitance after 2000 cycles at a scan rate of 100 mV s−1. This study provides insight into the effect of calcination temperature to generate the best-performing NiP VSB-5 electrode for high-performance supercapacitor.
|Original language||English (US)|
|Journal||JOURNAL OF ENERGY STORAGE|
|State||Published - Nov 22 2022|
Bibliographical noteKAUST Repository Item: Exported on 2023-01-30
Acknowledgements: Raissa acknowledges the financial support from The Indonesia Endowment Fund for Education (LPDP), The Indonesia Ministry of Finance. MI acknowledges the financial support from Institut Teknologi Bandung under the scheme of Capacity Building for Young Lecturers (No. 139/IT1.B07.1/TA.00/2021). Authors also acknowledge the partial support from The Indonesia Ministry of Education, Culture, Research, and Technology.