Electrochemical Quartz Crystal Microbalance Study of Borohydride Electro-Oxidation on Pt: The Effect of Borohydride Concentration and Thiourea Adsorption
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Bibliographic record
Abstract
A systematic investigation of BH 4 − electro-oxidation in 2 M NaOH on Pt was carried out using the electrochemical quartz crystal microbalance technique (EQCM). Four sets of experiments were conducted: (i) Pt in NaOH, (ii) BH 4 − (between 10 and 60 mM) on Pt, (iii) thiourea (TU) on Pt, and (iv) BH 4 − in the presence of TU (between 0.01 and 2.1 mM) on Pt. The BH 4 − electro-oxidation mechanism was developed by correlating the EQCM results with density functional theory (DFT) calculations from the literature revealing the energetically most favorable adsorbates. The surface coverage by key intermediates was estimated using the van der Waals molecular areas. On the anodic scan, the BH 4 − electrosorption was followed by dissociation of BH 4,ad generating BH y,ad and (4 − y )H ad, with y between 1 and 3, depending on the available surface sites. BH y,ad is further oxidized as a function of electrode potential in Eley−Rideal and Langmuir−Hinshelwood type mechanisms with the participation of OH − and OH ad, respectively. The oxidative desorption on the cathodic scan at potentials between 0.1 and 0.5 V of strongly adsorbed intermediates such as BOH ad and BH 2 OH ad is essential for recovering the Pt electrocatalytic activity. TU adsorption on Pt produces a characteristic potential dependent adsorption−desorption hysteresis. Furthermore, at TU concentrations above 0.045 mM for 30 mM BH 4 − a bilayer is formed on the surface, which is stabilized by Lewis acid−base interactions between TU and BH 4 − . As a result, the BH 4 − oxidation overpotential is increased leading to incomplete oxidation, whereas the BH 4 − thermocatalytic hydrolysis is inhibited.
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Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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