The files EC_data.txt and SQUID_data.txt contain electrochemistry and magnetometry raw data for the in situ SQUID experiment shown in Fig.2a. 
Electrochemical raw data in EC_data.txt consist of 4 columns: Time_Potentiostat in s, Potential in V, Current in A and time_relative_to_m in s. The last column gives the time relative to the time in the file SQUID_data, which was calculated using the time delay of the starting points of both measurments. 
Magnetometry raw data in SQUID_data.txt consist of 3 columns: m in emu, time_SQUID in s and U_m in V. The conversion factor from emu to Am is 10^-3. U_m are interpolated voltages at the time_SQUID datapoints. The magnetic moment m was corrected for a small diamagnetic background signal.

The following data are shown in Fig.2a in the top panel from the file EC_data:

Cycle 2 cathodic: lines 25820-27035, Current as a function of Potential  
Cycle 2 anodic: lines 27036-27785, Current as a function of Potential  

The following data are shown in Fig.2a in the bottom panel from the file SQUID_data:

Cycle 2 cathodic: lines 804-884, m as a function of U_m  
Cycle 2 anodic: lines 885-934, m as a function of U_m
