| HAADF-STEM | particle size ranging from around 10 nm to a few tens of nanometers in diameter; shell thickness about 3-4 nm |
|---|---|
| STEM-EDS | ~1 at% of Mo (with respect to the Co:Fe:Mo atomic ratio) is incorporated into the nanoparticles |
| EELS, B-K edge | sharp pre-peak at 194 eV; broader peak (196–210 eV) |
J. Johny, N. Daneu, M. Smiljanić, A. Thévenot, F. Dionigi, L. Zhang, B.R. Bhagat, M. Poberžnik, D. Vengust, L. Bijelić, L. Titze, L. Riillo, R. Barone, A. Ramunni, I. Arčon, C. Convery, M. Mamlouk, N. Patel, M. M. Kržmanc, N. Hodnik, A. Kokalj, M. Spreitzer, P. Strasser, S. Gupta. “Mechanistic understanding of boron migration in multi-metal boride electrocatalysts for anion-exchange membrane water electrolysis.” ChemRxiv (). https://doi.org/10.26434/chemrxiv.15007346/v2
No separate supporting information file was found among the files available from the ChemRxiv record
| HAADF-STEM | particle size ranging from around 10 nm to a few tens of nanometers in diameter; shell thickness about 3-4 nm |
|---|---|
| CV | oxidative peak at +1.2 V |
| XANES before OER | metallic Co, 83 %; metallic Fe, 77 % |
| EDS | up to 0.5 at% of Mo |
|---|---|
| STEM | new sheet-like features were also observed after OER |
| ECSA after 2 h of OER | ~5 times increase |
| Co K-edge XANES | Co3+, 70 %; metallic Co, 30 %; no contribution from Co2+ |
| Fe K-edge XANES | Fe3+, 62 %; metallic Fe, 33 % |
| XRD | α-Fe type structure (Im−3m) |
|---|---|
| HAADF-STEM | particle size ranging from around 10 nm to a few tens of nanometers in diameter; thick oxide shell (~6 - 7 nm) |
| XPS | Co:B = 81.7:18.3 |
|---|---|
| XPS, annealed to 500 °C | Co:B = 31.1:68.9 |
| XRD, annealed to 500 °C | fcc cubic Co structure |
| Operando Raman spectroscopy (1 M KOH) | peak at 500 cm⁻¹; small hump at ~650–700 cm⁻¹ |
|---|
| Operando Raman spectroscopy (1 M KOH) | single signature at 670 cm⁻¹ |
|---|