Electrochemical synthesis of alkali-intercalated iron selenide superconductors<xref ref-type="fn" rid="cpb152144fn1">*</xref>

Electrochemical synthesis of alkali-intercalated iron selenide superconductors*

Shen Shi-Jie^a), Ying Tian-Ping^a), Wang Gang^a), Jin Shi-Feng^a), Zhang Han^a), Lin Zhi-Ping^a), Chen Xiao-Long^a),^b)

(a) Sketch of the electrochemical cell. (1) cover lid, (2) container, (3) insulator ring, (4) separator, (5) electrolyte, (6) cylinder, (7) Al or Cu foil with FeSe film, and (8) K or Na film. (b) Schematic of the K intercalation process. (c) and (d) Voltage of the working electrode (FeSe) against the reference electrode as a function of the capacity. The insets show the setup of respective circuits.