1. SEM images ((a) 2 : 1, (b) 4 : 1, (c) 6 : 1, (d)8 : 1), (e) XRD patterns and (f) cycling performance at 0.2C of the products obtained with different molar ratios of acrylamide to total metal ions, and Coulombic efficiency of the product with molar ratio of acrylamide to total metal ions of 8 : 1 (after 3 cycles at 0.1C, 1C=800 mA/g)

2. SEM images ((a) 0.28 mol/L, (b) 0.56 mol/L, (c) 0.83 mol/L, (d) 1.11 mol/L), (e) XRD patterns and (f) cycling performance at 0.2C of the products obtained with different glucose concentrations, and Coulombic efficiency of the product with 1.11 mol/L glucose (after three cycles at 0.1C, 1C=800 mA/g)

3. SEM images ((a) 873 K, (b) 923 K, (c) 973 K), (d) XRD patterns and (e) cycling performance at 0.2C of the products obtained with different heat treatment temperatures, and Coulombic efficiency of the product with heat-treatment temperature of 873 K (after three cycles at 0.1C, 1C=800 mA/g)

4. (a) TEM and (b) HRTEM images of Bi₂Mn₄O₁₀ obtained at optimized conditions

5. (a) Particle size distribution and (b) N₂ adsorption and desorption curves of Bi₂Mn₄O₁₀ obtained at optimized conditions with inset in (b) showing the pore size distribution curve

6. (a) CV curves, (b) voltage-specific capacity curves at 0.1C and (c) rate performance curve of Bi₂Mn₄O₁₀ obtained at optimized conditions