Electrical double-layer capacitors (EDLCs) using a biomass-derived activated carbon electrode with Na₂SO₄–NaI–KI as a redox additive electrolyte were investigated. Biomass-derived activated carbon materials from pomelo peels were prepared by chemical activation in potassium hydroxide followed by carbonization. The biomass-derived activated carbon has a high specific surface area of 1360 m² g⁻¹, which is suitable for electrode materials. Moreover, a stable couple inorganic redox additive electrolyte were studied by the addition of NaI and KI to Na₂SO₄ forming a redox additive electrolyte. The electrical double-layer based on activated carbon/Na₂SO₄–NaI–KI/activated carbon has an excellent specific capacitance (334.3 F g⁻¹), which is 412% higher in comparison with that of activated carbon/Na₂SO₄/activated carbon (81.14 F g⁻¹) at the same current density of 0.5 A g⁻¹. The EDLC using Na₂SO₄–NaI–KI electrolyte has a high energy density of 22.75 W h kg⁻¹, which is approximately four times higher than EDLCs based on Na₂SO₄ (5.52 W h kg⁻¹).

研究了使用生物质衍生的活性炭电极，Na ₂ SO ₄ -NaI-KI作为氧化还原添加剂电解质的双电层电容器（EDLC）。通过在氢氧化钾中化学活化，然后碳化，来制备柚皮中生物质衍生的活性炭材料。来自生物质的活性炭具有1360m ²  g ^-1的高比表面积，其适合于电极材料。此外，通过向Na ₂ SO _4中添加NaI和KI以形成氧化还原添加剂电解质，研究了稳定的偶合无机氧化还原添加剂电解质。基于活性炭/ Na ₂ SO的双电层₄ –NaI–KI /活性炭具有优异的比电容（334.3 F g ^-1），比活性炭/ Na ₂ SO ₄ /活性炭（81.14 F g ^-1）高出412％。 0.5 A g ^-1的相同电流密度。使用Na ₂ SO ₄ -NaI-KI电解质的EDLC具有22.75 W h kg ^-1的高能量密度，大约是基于Na ₂ SO _4的EDLC （5.52 W h kg ^-1）的四倍。