Alzaid Meshal, Iqbal Muhammad Zahir, Siddique Saman, Hadia N M A
Physics Department College of Science, Jouf University P. O. Box 2014 Sakaka Al Jouf Saudi Arabia.
Nanotechnology Research Laboratory, Faculty of Engineering Sciences, GIK Institute of Engineering Sciences and Technology Topi 23640 Khyber Pakhtunkhwa Pakistan
RSC Adv. 2021 Aug 19;11(45):28042-28051. doi: 10.1039/d0ra09952j. eCollection 2021 Aug 16.
The significant electrochemical performance in terms of both specific energy and power delivered hybrid energy storage devices (supercapattery) has raised their versatile worth but electrodes with flashing electrochemical conduct are still craved for better performance. In this work, binary and ternary metal phosphates based on copper, cobalt, and manganese were synthesized by a sonochemical method. Then, the compositions of copper and cobalt were optimized in ternary metal phosphates. The structural studies and morphological aspects of synthesized materials were scrutinized by X-ray diffraction and scanning electron microscopy. Furthermore, the electrochemical characterizations were performed in three- and two-cell configurations. The sample with equal compositions of copper and cobalt (50/50) demonstrates the highest specific capacity of 340 C g at a current density of 0.5 A g among all. This optimized composition was utilized as a positive electrode material in a supercapattery device that reveals a high specific capacity of 247 C g. The real device exhibits an excellent energy density of 55 W h kg while delivering a power density of 800 W kg. Furthermore, the device was able to provide an outstanding specific power of 6400 W kg while still exhibiting a specific energy of 19 W h kg. The stability potential of the device was tested for 2500 continuous charge and discharge cycles at 8 A g. Excellent capacitive retention of 90% was obtained, which expresses outstanding cyclic stability of the real device. A theoretical study was performed to investigate the capacitance and diffusion-controlled contribution in the device performance using Dunn's model. The maximum diffusion-controlled contribution of 85% was found at 3 mV s scan rate. The study demonstrates the utilization of ternary metal phosphates as self-supported electrode materials for potential energy storage applications.
混合储能装置（超级电容器）在比能量和功率方面具有显著的电化学性能，这提升了它们的广泛价值，但具有快速电化学传导性的电极仍渴望获得更好的性能。在这项工作中，通过声化学方法合成了基于铜、钴和锰的二元和三元金属磷酸盐。然后，对三元金属磷酸盐中铜和钴的组成进行了优化。通过X射线衍射和扫描电子显微镜对合成材料的结构和形态进行了研究。此外，在三电池和两电池配置中进行了电化学表征。在所有样品中，铜和钴组成相等（50/50）的样品在0.5 A g的电流密度下表现出最高比容量340 C g。这种优化后的组成被用作超级电容器装置的正极材料，该装置显示出247 C g的高比容量。实际装置在提供800 W kg功率密度时表现出55 W h kg的优异能量密度。此外，该装置能够提供6400 W kg的出色比功率，同时仍表现出19 W h kg的比能量。在8 A g下对该装置的稳定性潜力进行了2500次连续充放电循环测试。获得了90%的优异电容保持率，这表明实际装置具有出色的循环稳定性。使用邓恩模型进行了理论研究，以研究该装置性能中的电容和扩散控制贡献。在3 mV s扫描速率下发现最大扩散控制贡献为85%。该研究证明了三元金属磷酸盐作为潜在储能应用的自支撑电极材料的应用。
