Effective electronic tuning of Pt single atomsviaheterogeneous atomic coordination of (Co,Ni)(OH)₂for efficient hydrogen evolution

Abstract

Hydroxide-supported atomic structures, particularly single atoms, offer a wide scope for active microenvironmental tuning to enhance catalytic performance, but little has been explored on the electronic synergy between mono- and...

High‐Valence Oxides for High Performance Oxygen Evolution Electrocatalysis

“…Unfortunately, most of HVOs are unstable or inactive at the cathodic potential for ORR/HER (U < 1.23 V vs RHE for ORR and U < 0 V vs RHE for HER), although some bifunctional activities of HVOs are recently reported, such as Ir/Ni(OH) 2 (HER/OER: Ir 5+ ) [123] and Mg-doped LaNiO 3 nanofibers (ORR/OER: Ni 3+/4+ ). [124] Specific structures with multi-phases, such as core-shell structures and coordinated hybrids or complexes, [125,126] may be developed to stabilize the high-valence metal sites at the cathodic potential.…”

Delaminated MBene sheets beyond usual 2D transition metal materials for securing Pt single atoms to boost hydrogen evolution

“…4,5 As such, optimizing Pt dispersion on the supporting material by downsizing from the nano-scale to isolated single atoms (SAs) is of great importance for maximizing the number of Pt active sites and improving the turnover frequency (TOF) and mass activity. 6,7 However, in most cases, the physicochemical properties of Pt SAs are seriously influenced by coordination/supporting environments known to be critical factors for allowing high intrinsic activity and durability of Pt catalysts. The past few years have observed the meteoric development of various supporting matrices for immobilizing individual Pt SAs, such as nanocarbons or multidimensional transition metal (TM)based materials.…”

Ni–Pd Nanocomposites on Reduced Graphene Oxide Support as Electrocatalysts for Hydrogen Evolution Reactions

“…6−10 The everincreasing demand and limited resources of platinum stimulate the search for alternative cost-efficient and readily available catalysts, electrocatalytic activity of which would be comparable to that of the commercial products. 11,12 One of the common approaches on this route is designing bimetallic catalysts, in which noble metals (Pt, Pd) are partially replaced by less expansive 3d-metals (Co, Ni, Cu). 13−19 Combination of two different metals often provides a synergetic effect not attainable in single-component materials by offering an alternative catalytic mechanism.…”

“…Intellectually designed nanostructured materials play a critical role in catalyzing numerous crucial chemical reactions, including actual industrial processes. , Among the catalyzed reactions special attention is given to different methods of water splitting − in the frames of strategic transfer from traditional fuel sources to alternative energetics. The current electrochemical water splitting technique is based on the use of expensive noble metal catalysts, mostly platinum. − The ever-increasing demand and limited resources of platinum stimulate the search for alternative cost-efficient and readily available catalysts, electrocatalytic activity of which would be comparable to that of the commercial products. , …”