Pacemakers are devices that are surgically inserted near the heart, regulate cardiac stimulation and its frequency by electrical signals. They are usually applied for a condition that reduces the normal heart rate. These small gadgets, which save many human lives, use batteries that have a limited duration of 5 to 12 years which must be replaced again by another surgical intervention. However, a group of researchers at Jiao Tong University in Shanghai, led by Bin Yang, are testing a protot...