Improved hydrogen evolution on glassy carbon electrode modified with novel Pt/cetyltrimethylammonium bromide nanoscale aggregates

A novel, cost-effective, and simple electrocatalyst based on a Pt-modified glassy carbon electrode (GCE), using cetyltrimethylammonium bromide (CTAB) as a cationic surfactant, is reported. Amphiphilic CTAB molecules were adsorbed on GCE by immersion in a CTAB solution. The positively charged hydrophilic layer, which consisted of small aggregates of average size less than 100 nm, was used for accumulation and complexation of [PtCl6]2− anions by immersing the electrode in K2PtCl6 solution. The modified electrode was characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, impedance spectroscopy, and electrochemical methods. The electrocatalytic activity of the Pt particles in the hydrogen evolution reaction (HER) was investigated. The results show that the CTAB surfactant enhances the electrocatalytic activity of the Pt particles in the HER in acidic solution.

Graphical AbstractA novel, cost-effective, and simple electrocatalyst based on a Pt-modified glassy carbon electrode prepared using cetyltrimethylammonium bromide (CTAB) is reported. The results show that CTAB nanoaggregates enhance the electrocatalytic activity of the Pt microparticles in hydrogen evolution reaction.Figure optionsDownload as PowerPoint slide