Deconvolution of phase–size–strain effects in metal carbide nanocrystals for enhanced hydrogen evolution

Abstract

<p>Understanding the descriptors of electrochemical activity and ways to modulate them are of paramount importance for the efficient structural engineering of electrocatalysts. Although, many studies separately elucidated the significance of...</p>

Metal–metal bonded pentamolybdate hybrids as electron storage materials

“…Electron-rich metal oxo clusters have attracted significant attention due to their diverse structures and excellent physicochemical properties for applications, including medicine, 1,2 biotechnology, catalysis, 3,4 molecular electronics materials, 5,6 nanotechnology, 7 and energy storage. 8 The formation of deeply reduced, electron-rich oxo clusters was achieved by Mo VI → Mo IV super-reduction; the Xu's group has been working on the establishment and exploration of the chemical properties of the deeply reduced electron-rich Mo IV 3 -polyoxometalate (POMs) featuring triangularly Mo IV -Mo IV metalmetal bonded incomplete cuboidal (TIC) [Mo IV 3 O 4 ] units, including synthesis, structure and catalysis.…”

Optimized Metal Deficiency-Induced Operando Phase Transformation Enhances Charge Polarization Promoting Hydrogen Evolution Reaction

“…The real-time application of HER demands the rationale design of non-noble metal-based compounds as an alternative to expensive Pt-based electrocatalysts . In the last several years, scientists have employed different designing strategies to synthesize non-noble metal-based water-splitting catalysts such as phosphides, ,− carbides, − nitrides, , borides, , and chalcogenides. − Several exciting concepts based on alloying, dealloying, shape and size modulation, − substitution, interface engineering, − crystal structure modulation, , and ordered arrangement of atoms in the crystal lattice , have been used to design these compounds. There are a few reports on structural phase transition (SPT) during the catalytic performance; − however, they are accompanied by a complete change in the chemical composition.…”

Electrospinning Preparation of N, P Dual-Doped Molybdenum Carbide/Porous Carbon Fibers with Highly Improved Electrocatalytic Activity for Hydrogen Evolution Reaction

“…Recently, various earth-abundant element-based electrocatalysts for HER have been reported, including transition metals (Fe, Co, Ni, and Mo), phosphides, sulfides, − selenides, nitrides, carbides, , and metal-free carbon materials . Molybdenum-based carbides are a kind of most promising HER electrocatalysts due to their noble metal-like electronic structure close to the Fermi level, adaptability to be doped, existence of multiple stable phases, and electrochemical stability . Especially, molybdenum carbides of MoC and Mo 2 C have attracted much attention because of their d-band electronic density of states, tunable characteristics of phase and composition, stability in a wide pH range, and good electrocatalytic performance similar to Pt. , Mo 2 C has a strong Mo–H bond on the surface, while MoC with a higher C content usually has a weaker Mo–H bond.…”