The performance of a supercapattery depends on its energy density, rate capability of charge and discharge and stability of electrode. Here in, a sonochemical method followed by calcination was applied to synthesize nickel phosphate-silver phosphate (Ni₃(PO₄)₂

Ag₃PO₄) nanocomposites. Morphological studies revealed that crystalline Ag₃PO₄ (∼10 nm) was intimately anchored on the surface of amorphous Ni₃(PO₄)₂, which benefits efficient charge transfer between the two metal phosphates. The optimized Ni₃(PO₄)₂Ag₃PO₄ nanocomposite electrode exhibited a significant boost in rate capability from 29% (Ni₃(PO₄)₂) to 78% capacity retention with the maximum specific capacity of 478C/g at 1 A/g in 1 M KOH electrolyte. The enhancement of rate capability originated from a more rapid electron-transfer rate and an augmentation of electroactive sites for electrolyte ion diffusion from the interfaces of porous Ni₃(PO₄)₂ and an improvement in the electrical conductivity of crystalline Ag₃PO₄. The fabricated Ni₃(PO₄)₂Ag₃PO₄//activated carbon-based supercapattery exhibited an energy density of 32.4 Wh/kg at 399.5 W/kg and excellent cyclic stability (∼82% capacity retention after 5000 cycles).

中文翻译：

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通过与结晶磷酸银的组合提高非晶态磷酸镍超级电池电极的倍率能力

超级电池的性能取决于其能量密度，充放电的速率能力以及电极的稳定性。在此，采用声化学方法接着煅烧来合成磷酸镍-磷酸银（Ni ₃（PO ₄）₂

Ag ₃ PO ₄）纳米复合材料。形态学研究表明，结晶的Ag ₃ PO ₄（〜10 nm）紧密地锚定在非晶态的Ni ₃（PO ₄）₂表面上，这有利于两种金属磷酸盐之间的有效电荷转移。优化的Ni ₃（PO ₄）₂Ag ₃ PO ₄纳米复合电极在1 M KOH电解质中以1 A / g的最大比容量为478C / g时，速率保持率从29％（Ni ₃（PO ₄）₂）显着提高到78％的容量保持率。速率能力的提高源自更快速的电子传输速率和电解质离子从多孔Ni ₃（PO ₄）₂的界面扩散的电活性位的增加以及结晶Ag ₃ PO _4的电导率的提高。制成的Ni ₃（PO ₄）₂Ag ₃ PO ₄活化的碳基超级电池在399.5 W / kg的能量密度下显示32.4 Wh / kg的能量密度和出色的循环稳定性（5000次循环后容量保持率约82％）。