First-principles approach to the structural, electronic and intercalation voltage of Prussian blue (KxFe[Fe(CN)6]) (x = 1, 2) as potential cathode material for potassium ion batteries

Fatin Nabilah Sazman, Nur Hamizah Mohd Zaki, Fadhlul Wafi Badrudin, Mohd Hazrie Samat, N.A. Malik, N. A. N. M. Nor, Oskar Hasdinor Hassan, Muhd Zu Azhan Yahya, Mohamad Fariz Mohamad Taib