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Effect of different electrode spacing on cell voltage and current efficiency (current density 207 A/m2, tin concentration 130 g/L, free-MSA concentration 100 g/L, temperature 295.15 K, 4 h; (b) 2.5 cm, (c) 4.0 cm, (d) 5.5 cm, and (e) 7.0 cm).
