Thermogalvanic refrigeration by applying external electrical current drives reversible electrochemistry requiring far less energy

https://www.eurekalert.org/news-releases/1071476

"scalable, eco-friendly... heat produced enables record-high cooling based on electrochemical redox reactions involving dissolved iron ions which lose an electron/ absorb heat, and in other phase gain electron/ release heat... hydrated iron salt containing perchlorate helped iron ions dissolve/ dissociate in solvent containing nitriles rather than pure water, improving hydrogalvanic cell’s cooling power by 70%... cool the surrounding electrolyte by 1.42°K... wearable cooling, industrial"