To achieve higher supercapacitive performance of active material, several materials with precise structures and properties have been prepared using different chemical synthesis methods. Recently, amorphous materials are gaining much attention as an electrode in supercapacitor application as it provides superior electrochemical properties due to disorder in structure. So, in this investigation, a facile, binder free successive ionic layer adsorption and reaction (SILAR) method is adopted for the preparation and deposition of amorphous, hydrous nickel phosphate thin films on stainless steel substrates. The amorphous nickel phosphate shows mesoporous, clusters of particles like morphology. In the electrochemical study, the amorphous, hydrous nickel phosphate electrode demonstrates a superior specific capacitance of 1700 F g⁻¹ (specific capacity- 814 C g⁻¹) at 0.5 mA cm⁻² current density along with excellent capacitive retention (96.55%) and coulombic efficiency (98.62%) over 5000 cycles. Furthermore, fabricated hybrid supercapacitor device using the nickel phosphate as cathode and reduced graphene oxide as anode exhibits specific capacitance of 113.5 F g⁻¹ at 3 mA cm⁻² current density with a high 40.37 Wh kg⁻¹ energy density at 1.689 kW kg⁻¹ power density alongwith excellent cyclic stability (95.09% retention after 5000 cycles). The obtained results illustrate that the amorphous, hydrous nature of nickel phosphate is a beneficial and superior choice as a cathode material in high-performing hybrid asymmetric supercapacitor devices.

为了实现活性材料更高的超级电容性能，已经使用不同的化学合成方法制备了几种具有精确结构和性能的材料。最近，非晶材料作为超级电容器应用中的电极而受到广泛关注，因为它由于结构无序而提供优异的电化学性能。因此，在本研究中，采用简便、无粘合剂的连续离子层吸附和反应 (SILAR) 方法在不锈钢基材上制备和沉积非晶态水合磷酸镍薄膜。无定形磷酸镍显示出类似形态的中孔颗粒簇。在电化学研究中，无定形、水合磷酸镍电极表现出优异的比电容为 1700 F g ^-1（比容量 - 814 C g ^-1）在 0.5 mA cm ^-2电流密度下以及超过 5000 次循环的优异电容保持率（96.55%）和库仑效率（98.62%）。此外，使用磷酸镍作为阴极和还原氧化石墨烯作为阳极制造的混合超级电容器装置在 3 mA cm ^-2电流密度下表现出 113.5 F g ^{-1 的}比电容，在 1.689 kW kg ^{- 下}具有 40.37 Wh kg ^-1的高能量密度¹功率密度以及出色的循环稳定性（5000 次循环后保持率达 95.09%）。获得的结果表明，磷酸镍的无定形、含水性质是作为高性能混合非对称超级电容器装置中阴极材料的有益且优越的选择。