Superconductivity in FeTe0.8S0.2 induced by battery-like reaction
  Superconductivity is successfully induced by utilizing a battery-like reaction found in a typical Li-ion battery. Excess Fe in FeTe0.8S0.2 is electrochemically de-intercalated by applying a voltage in a citric acid solution. The superconducting properties improve with an increase in the applied voltage up to 1.5 V. This result suggests that an electrochemical reaction can be used as a novel method to develop new superconducting materials. 
Aichi Yamashita, Satoshi Demura, Masashi Tanaka, Keita Deguchi, Takuma   Yamaki, Hiroshi Hara, Kouji Suzuki, Yunchao Zhang, ...
cond-mat.supr-con