Haseebul Hassan

Electrochemical Analysis for NGQDs/MnO ₂ /Sn-MOF with (a) CV and (b) GCD.

To advance off-grid energy solutions, developing flexible photobatteries capable of direct light charging is essential. This study presents an innovative photobattery architecture that incorporates zinc oxide (ZnO₂) as an electron-transporting and hole-blocking layer, combined with a hybrid methylammonium tin iodide composite with poly-triarylamine (MASnI₃/PTAA) for light absorption and hole transport. PTAA facilitates efficient hole transport to the anode, thereby enhancing charge separation and reducing recombination losses. The MASnI₃ perovskite serves as an effective sunlight absorber, generating charge carriers. ZnO₂, known for its high chemical stability and rapid electron mobility, effectively blocks holes and ensures swift electron flow to the cathode, which optimizes the overall charge transfer dynamics. This refined structure achieves a photoconversion efficiency enhancement of up to 0.53% and retains approximately 98% of its capacity after 700 cycles. The optimized MASnI₃/PTAA/ZnO₂ photobattery demonstrates a 3-fold reduction in light charging time, positioning it as a strong candidate for practical, light-rechargeable energy storage applications.

We efficiently synthesize magnesium copper phosphate nanoparticles (MgCuPO₄) doped with graphene quantum dots (GQDs) using a hydrothermal method for supercapattery and oxygen evolution reactions in KOH electrolyte. The GQDs-MgCuPO₄ electrode has a high specific capacity (1188 Cg⁻¹ at 1.0 Ag⁻¹) and a high rate capability (67%). The symmetric supercapattery (GQDs-MgCuPO₄//GQDs-MgCuPO₄) provides a staggering energy density of 46 Wh-kg⁻¹, as well as a high power density of 1300 W-kg⁻¹ and a high cyclic stability of 93% after 10,000 cycles. Furthermore, it demonstrates high efficiency in the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER), with corresponding low overpotentials of 181 mV and 119 mV. The GQDs-MgCuPO₄ stands out as a capable solution for various energy storage and conversion difficulties.