The files EC_data.txt and SQUID_data.txt contain electrochemistry and magnetometry raw data for the in situ SQUID experiment shown in Fig.2c and Fig.S7b. 
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 selected time_SQUID datapoints. The magnetic moment m was corrected for a small diamagnetic background signal.

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

lines 15105-16473, Potential as a function of time_relative_to_m (converted to minutes)

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

lines 722-814, m as a function of time_SQUID (converted to minutes)  


The following data are shown in Fig.S7b in the top panel from the file SQUID_data:

lines 560-962, m as a function of time_SQUID (converted to minutes)  

The following data are shown in Fig.S7b in the bottom panel from the file EC_data:

lines 11018-18704, Potential and Current as a function of time_relative_to_m (converted to minutes)