(Photo)electrochemical data for molybdenum disulfide-borophene (B/MoS2) composite

The samples description: 
MoS2 - commercial molybdenum disulfide (Sigma-Aldrich). The main manuscript describes the results obtained with commercial MoS2 and an optimal composite composition of MoS2:B = 500:1, which was labeled as B/MoS2. In detail, the preparation of borophene-enriched MoS2 catalysts was performed using a planetary zirconia ball mill, equipped with 18 zirconia balls (Fritsch Pulverisette). The milling cycle lasted 6 h, with precautions taken to prevent overheating by employing 30 min milling periods followed by 15 min cooling breaks. The operational parameters were set at 450 rpm, with a total mass loading of 500 mg for the molybdenum disulfide (Sigma-Aldrich) and boron (Sigma-Aldrich) powders.
The electrocatalytic properties of catalysts: Hydrogen Evolution Reaction (HER) and Photoelectrocatalytic (PEC) polarization curves of MoS2 and B/MoS2. Tafel plots of MoS2 and B/MoS2 in HER and PEC processes. Nyquist plots of MoS2 and B/MoS2 in HER and PEC processes. The stability measurement of MoS2 and B/MoS2 in HER and PEC processes. 
The electrochemical analyses were performed using a BioLogic VMP-3 potentiostat in a three-electrode setup, with the reactor equipped with a temperature-controlled bath at 25 ℃. A mercury sulfate electrode (MSE, HgǀHg2SO4 in 1 M H2SO4, RE-2CP) served as the reference electrode (RE), while a platinum wire was used as the counter electrode (CE). The working electrode (WE) consisted of a 10 x 40 mm graphitic foil with a thickness of 125 µm (Goodfellow) coated with an active material. The active material dispersion was prepared at a concentration of 10 mg/mL in a solution of isopropanol/water (1:3 by volume) containing 0.05 % Nafion (Sigma-Aldrich) as a binder. The electrodes were fabricated by drop-casting 200 µL of the active material dispersion onto both sides of the graphitic foil, followed by drying at 90 ℃ under vacuum for 12 hours. All (photo)electrochemical measurements were conducted under acidic conditions using 0.5 M H2SO4. The electrocatalyst with the highest activity was also evaluated on a 10 x 40 mm nickel foam to assess its performance on alternative substrates. To evaluate the stability of the most active material, current densities of 10 and 20 mA/cm2 were applied for 20 hours. All potentials were referenced to the reversible hydrogen electrode (RHE), calculated using the equation ERHE=0.059 x pH + EWE + E0, where ERHE, EWE, and E0 represent the potential of reversible hydrogen electrode (RHE), working electrode (WE), and standard potential of reference electrode vs. RHE (E0 = 0.657 V), respectively. Before electrochemical testing, the MSE was calibrated in 0.1 M HCl solution relative to the RHE.