Supplementary material

Electrochemistry of Sc3N@C78 Embedded in DDAB Films in Aqueous Solution

Mingyan Zhaoa, Lin Zhanga, Ning Chenb, Chunru Wangb, Louzhen Fana*, Shihe Yangc

aDepartment of Chemistry, BeijingNormalUniversity, Beijing, China, 100875

bInstitute of Chemistry, Chinese Academy of Sciences, Beijing, China, 100080

cDepartment of Chemistry, The Hong Kong University of Science and Technology, ClearWaterBay, Kowloon, Hong Kong

Figure S1CVs of Sc3N@C78/DDAB films with a small concentration of DDABin 0.1M KCl aqueoussolution. Scan rate: 100 mV s-1.

Figure S2. CVs of Sc3N@C78/DDAB films in 0.1M KCl aqueous solution in the potential scan range between +0.6V and -1.5 V. Scan rate: 100 mV s-1.

Figure S3 The relationship between the first cathodic peak current and scan rate(a), and the square root of the scan rate (b) of Sc3N@C78/DDAB films.

TABLE 1Anodic and Cathodic Peak Potentials and Half-Wave Potentials for the First Two Reduction Peaks and the First Oxidation Peak for Sc3N@C78/DDAB Films on a GC Electrode in Aqueous Solution Containing Various 0.1 M Electrolytes at a Scan Rate of 100 mV s-1

Sc3N@C78+/ Sc3N@C78 (E/V vs. SCE) Sc3N@C78/ Sc3N@C78-(E/V vs. SCE) Sc3N@C78-/ Sc3N@C782-(E/V vs. SCE)

electrolyte Epa(Ox1) Epc(Ox1) E1/2(Ox1) Epc(Red1) Epa(Red1) E1/2(Red1) Epc(Red2) Epa(Red2) E1/2(Red2)

KCl / 0.454 / 0.389 / 0.422 / -0.128 / -0.080 / -0.104 / -0.330 / -0.288 / -0.309
NaCl / 0.454 / 0.396 / 0.425 / -0.132 / -0.078 / -0.105 / -0.336 / -0.288 / -0.312
CaCl2 / 0.456 / 0.392 / 0.424 / -0.128 / -0.086 / -0.107 / -0.332 / -0.290 / -0.311
KF / 0.466 / 0.432 / 0.449 / -0.101 / -0.071 / -0.086 / -0.319 / -0.277 / -0.298
KBr / 0.441 / 0.377 / 0.409 / -0.235 / -0.167 / -0.201 / -0.439 / -0.355 / -0.397
KClO3 / 0.440 / 0.372 / 0.406 / -0.235 / -0.183 / -0.209 / -0.441 / -0.357 / -0.399

1