Self-Supported MoO₂/MoSi₂ Ceramic Electrode for High Current Density Hydrogen Evolution Reaction

Abstract

Ceramic electrodes are cost-effective and stable at high current densities. Thus, they are highly considered for industrial hydrogen production. In this study, a novel self-supported MoO2/MoSi2 ceramic electrode, with open finger-like holes and excellent electrochemical performance, was successfully prepared by phase-inversion, the shaping method of tape-casting, and hydrothermal treatment. The obtained MoO2/MoSi2 electrode has a lower overpotential than the Pt/C electrode at current densities greater than 330 and 410 mA cm–2 in an alkaline and acidic environment, respectively. Furthermore, the electrode exhibits excellent stability at 10–1000 mA cm–2 for 260 h in both alkaline and acidic solutions. Density functional theory calculations showed that the MoO2/MoSi2 heterostructure displays the lowest H adsorption free energy and the highest density of states around the Fermi level.

Constructing self-supported Pt/MoO2 on molybdenum mesh for a highly efficient hydrogen evolution reaction

“…These plane assignments are in accordance with the monoclinic phase of MoO 2 , as documented in the PDF#76-1807 reference. 31 It is noteworthy that there were no evident Pt diffraction peaks detected, indicating a potential lower Pt content or smaller Pt particle size within the Pt/MoO 2 @Mo samples. 20 Additionally, the two peaks at 40.50° and 58.62° are attributed to the (110) and (200) planes of the Mo support (PDF#89-4896).…”

“…MoO 2 is an exceptional support for Pt catalysts due to its remarkable thermal stability, inherent metal-like characteristics, and synergistic interaction with Pt. [28][29][30] Its stability ensures longevity and consistent performance, [31][32][33] while its metallic nature provides excellent electrical conductivity, crucial for efficient electron transfer during catalytic processes. [34][35][36][37][38] The metal-support interactions stabilize Pt particles, enhance the catalytic activity and selectivity, and resist catalyst poisoning.…”

Highly Selective Separation and Recovery of Molybdenum from Spent Catalysts by Constructing a Glass-Phase Extraction System

“…Molybdenum (Mo), with its prominent features of high melting point, tensile strength, and corrosion resistance, is a strategic metal for the steel, petrochemical, aerospace, national defense. , Due to the growing demand and extraction rate, the alarm that the exploitable primary resources of Mo will be exhausted within 50–100 years has been sounded . Hence, the sustainable development of Mo has to take place through recovering Mo from secondary resources.…”