Intermetallic compounds with high hydrogen evolution reaction performance: a case study of a MCo₂ (M = Ti, Zr, Hf and Sc) series

Abstract

Noble metals (e.g., Ru, Ir and Pt) or their derivatives exhibit very appealing activity toward the hydrogen evolution reaction (HER), but their high price and low reserves impede their wide use.

Function of Doping Ru Element in the Hydrogen Evolution Reaction in Rare-Earth Transition-Metal Intermetallics

“…(a) LSV and (b) normalized LSV based on the RF of ScM 2 and ScRu 0.25 M 1.75 (M = Co and Ni) at 1.0 M KOH (scan rate: 5 mV/s). The data for ScCo 2 were referenced from the literature and reproduced with permission from ref , Copyright 2019, the Royal Society of Chemistry.…”

Perspective on intermetallics towards efficient electrocatalytic water-splitting

“… 186 In addition, Pt 3 Ti 139 and TiCo 2 (ref. 109 ) also showed ideal conditions to adsorb H + on the surface. Besides the optimal adsorption of H + ( Fig.…”

“…In this series, TiCo 2 displayed a promising activity with an η -10 of 70 mV, a Tafel slope of 33 mV dec -1 , and stability of 12 h and, this activity was comparable to a Pt/C standard. 109 Efforts to stabilize and fine-tune the electronic structure by chemical synergism and structural site-isolation have been made to fabricate highly active non-noble catalysts. Based on the concept, FeCoNiAlTi, a high-entropy intermetallic (HEI) possessing the unusual periodically ordered structure was synthesized.…”

“…PtDy, 107 Al 2 Pt 108 and non-noble metal-based, i.e. Ti 2 Ni, 87 TiCo 2 , 109 Ni 2 Ta 110 intermetallic compounds for HER and OER. Along this line, lamellar nanostructured Ni–Co–Al was prepared by arc melting the homogenized raw materials at 1200 °C under Ar atmosphere that showed convincing results for alkaline HER.…”

“…In this series, TiCo 2 displayed a promising activity with an η −10 of 70 mV, a Tafel slope of 33 mV dec −1 , and stability of 12 h and, this activity was comparable to a Pt/C standard. 109 …”