Hassan Haseebul, Iqbal Muhammad Waqas, Al-Shaalan Nora Hamad, Alharthi Sarah, Alqarni Nawal D, Amin Mohammed A, Afzal Amir Muhammad
Department of Physics, Riphah International University Campus Lahore Pakistan
Department of Chemistry, College of Science, Princess Nourah Bint Abdulrahman University P. O. Box 84428 Riyadh 11671 Saudi Arabia.
Nanoscale Adv. 2023 Aug 7;5(18):4735-4751. doi: 10.1039/d3na00466j. eCollection 2023 Sep 12.
The implementation of battery-like electrode materials with complicated hollow structures, large surface areas, and excellent redox properties is an attractive strategy to improve the performance of hybrid supercapacitors. The efficiency of a supercapattery is determined by its energy density, rate capabilities, and electrode reliability. In this study, a magnesium copper phosphate nanocomposite (MgCuPO) was synthesized using a hydrothermal technique, and silver phosphate (AgPO) was decorated on its surface using a sonochemical technique. Morphological analyses demonstrated that AgPO was closely bound to the surface of amorphous MgCuPO. The MgCuPO nanocomposite electrode showed a 1138 C g capacity at 2 A g with considerably improved capacity retention of 59% at 3.2 A g. The increased capacity retention was due to the fast movement of electrons and the presence of an excess of active sites for the diffusion of ions from the porous AgPO surface. The MgCuPO-AgPO//AC supercapattery showed 49.4 W h kg energy density at 550 W kg power density and outstanding capacity retention (92% after 5000 cycles). The experimental findings for the oxygen evolution reaction reveal that the initial increase in potential required for MgCuPO-AgPO is 142 mV, indicating a clear Tafel slope of 49 mV dec.
采用具有复杂中空结构、大表面积和优异氧化还原性能的类电池电极材料是提高混合超级电容器性能的一种有吸引力的策略。超级电池的效率取决于其能量密度、倍率性能和电极可靠性。在本研究中，采用水热技术合成了磷酸镁铜纳米复合材料（MgCuPO），并采用声化学技术在其表面修饰了磷酸银（AgPO）。形态分析表明，AgPO与非晶态MgCuPO表面紧密结合。MgCuPO纳米复合电极在2 A g时表现出1138 C g的容量，在3.2 A g时容量保持率显著提高至59%。容量保持率的提高归因于电子的快速移动以及多孔AgPO表面存在过量的离子扩散活性位点。MgCuPO-AgPO//AC超级电池在550 W kg的功率密度下表现出49.4 W h kg的能量密度以及出色的容量保持率（5000次循环后为92%）。析氧反应的实验结果表明，MgCuPO-AgPO所需的初始电位增加为142 mV, 表明其Tafel斜率为49 mV dec。
