Fig. 3. Giant thermopowers of the I⁻/I₃⁻+ 2 wt % MC + y KCl ternary electrolytes.

(A) Recorded open-circuit voltages with the increase of the hot electrode temperature for the ternary electrolytes with various KCl contents (y = 0, 0.1, 0.2, 0.3, 0.5, and 0.8 M). The cold electrode temperature is held at 24°C. (B) Extracted mean thermopowers of the I⁻/I₃⁻ + 2 wt % MC + y KCl electrolytes. (C) Comparison of the thermopowers of the pristine I⁻/I₃⁻, I⁻/I₃⁻ + 2 wt % MC, I⁻/I₃⁻ + 0.3 M KCl, and I⁻/I₃⁻ + 2 wt % MC + 0.3 M KCl electrolytes. (D) Comparison of the absolute thermogalvanic thermopowers of the optimized ternary electrolyte with those reported in the literature for I⁻/I₃⁻ and [Fe(CN)₆]³⁻/[Fe(CN)₆]⁴⁻ redox couples.