Potassium formate, the potassium salt of formic acid, is an inexpensive, non-corrosive, non-toxic, and bio-degradable desiccant that has not been considered thus far in atmospheric water harvesting applications.ster is proposed that utilizes an aqueous solution of potassium formate as the medium for moisture absorption during the night when the ambient relative humidity is high, and desorption of absorbed moisture from the desiccant solution during the day using solar energy. A simple prototype was constructed that was able to extract 1.9 L of water∙m⁻² of solar area∙day⁻¹ with a moisture uptake of 0.34 kg_water∙kg_salt⁻¹at 25 °C and 79% RH and 0.29 kg_water∙kg_salt⁻¹ at 25 °C and 65% RH.

甲酸钾是甲酸的钾盐，它是一种廉价，无腐蚀性，无毒且可生物降解的干燥剂，目前在大气水收集应用中尚未得到考虑。提出了一种利用钾水溶液的酯。甲酸盐用作晚上，当环境相对湿度较高时吸收水分，并在白天使用太阳能从干燥剂溶液中解吸吸收的水分。构建了一个简单的原型，能够在25°C和79％RH和0.29 kg_{水的条件下}提取1.9 L的水∙m ⁻²的太阳能∙m ⁻² ∙天^-1的水分，_吸水量为0.34 kg_水分∙kg_盐^-1 ∙公斤_盐⁻¹ 在25°C和65％RH下。