Electrocatalytic Hydrogen Evolution Reaction from Acetic Acid over Gold Immobilized Glassy Carbon Surface

Abstract

A hydrogen fuel cell is a highly promising alternative to fossil fuel sources owing to the emission of harmless byproducts. However, the operation of hydrogen fuel cells requires a constant supply of highly pure hydrogen gas. The scarcity of sustainable methods of producing such clean hydrogen hinders its global availability. In this work, a noble Au-atom-decorated glassy carbon electrode (Au/GCE) was prepared via a conventional electrodeposition technique and used to investigate the generation of hydrogen from acetic acid (AA) in a neutral electrolyte using 0.1 M KCl as the supporting electrolyte. Electrochemical impedance spectroscopy (EIS), open circuit potential measurement, cyclic voltammetry (CV), and rotating disk electrode voltammetry (RDE) were performed for the characterization and investigation of the catalytic properties. The constructed catalyst was able to produce hydrogen from acetic acid at a potential of approximately −0.2 V vs. RHE, which is much lower than a bare GCE surface. According to estimates, the Tafel slope and exchange current density are 178 mV dec−1 and 7.90×10−6 A cm−2, respectively. Furthermore, it was revealed that the hydrogen evolution reaction from acetic acid has a turnover frequency (TOF) of approximately 0.11 s−1.

Efficient Electrocatalytic Hydrogen Evolution Reaction on CuO Immobilized Stainless‐Steel Electrode Prepared by the SILAR Method

“…The Proton adsorption is facilitated with a reducing environment. [60,61] As the OCP value is one indicator of interfacial environment, hence, a more negative OCP displaying with an electrode compared to another one under same reaction condition implies that the first one could generate in a more reducing environment. While CuO particles are deposited on the SS surface, the OCP value slightly shifted to negative potential in comparison with a SS electrode.…”

Mechanistic Analysis of Hydrogen Evolution Reaction on Stationary Polycrystalline Gold Electrodes in H2SO4 Solutions

“…Gold offers unique features as a useful model electrode for the HER over a wide range of potentials in various solutions, despite its moderate activity for the HER in an acidic solution [21][22][23][24][25][26]. Numerous studies were conducted on gold stationary and rotating disk electrodes in acidic and alkaline solutions, mostly using the common dc-polarization techniques to measure exchange current density and Tafel slopes but considerably less attention has focused on the kinetics of the HER [26][27][28][29][30][31][32][33][34].…”

Electrocatalytic Hydrogen Evolution of Transition Metal (Fe, Co and Cu)–Corrole Complexes Bearing an Imidazole Group

“…Hydrogen energy is the most promising renewable energy because of its high calorific value and pollution-free combustion [1,2]. A variety of methods have been reported for producing hydrogen, with the electrocatalytic hydrogen evolution reaction (HER) being particularly significant [3][4][5]. Due to the slow reaction kinetic of HER, the reaction usually needs to be facilitated by the addition of a catalyst.…”