Lattice Mismatch Guided Nickel‐Indium Heterogeneous Alloy Electrocatalysts for Promoting the Alkaline Hydrogen Evolution

Abstract

The immiscibility of crystallographic facets in multi‐metallic catalysts plays a key role in driving the green H2 production by water electrolysis. The lattice mismatch between tetragonal In and face‐centered cubic (fcc) Ni is 14.9 % but the mismatch with hexagonal close‐packed (hcp) Ni is 49.8 %. Hence, in a series of Ni−In heterogeneous alloys, In is selectively incorporated in the fcc Ni. The 18–20 nm Ni particles have 36 wt % fcc phase, which increases to 86 % after In incorporation. The charge transfer from In to Ni, stabilizes the Ni0 state and In develops a fractional positive charge that favors *OH adsorption. With only 5 at% In, 153 mL h−1 H2 is evolved at −385 mV with mass activity of 57.5 A g−1 at—400 mV, 200 h stability at −0.18 V versus reversible hydrogen electrode (RHE), and Pt‐like activity at high current densities, due to the spontaneous water dissociation, lower activation energy barrier, optimal adsorption energy of OH− ions and the prevention of catalyst poisoning.

Ultra-low temperature direct reconstruction of biomass fermentation of ethanol to higher alcohols in water over thermostable hcp-Ni

“…2a, the hcp-Ni content of 60.7% in hcp/fcc-Ni@C-1/2-500 was further determined, which means hcp-Ni plays a domination role in the catalyst. 39 According to the TEM image of hcp/fcc-Ni@C-1/2-500 catalyst shown in Fig. 2b-j, the metal nanocrystals were well dispersed on the carbon sheet, which was further identified as Ni metal by EDS (Fig.…”

“…2a, the hcp-Ni content of 60.7% in hcp/fcc-Ni@C-1/2-500 was further determined, which means hcp-Ni plays a domination role in the catalyst. 39…”

Insights of the efficient hydrogen evolution reaction performance in bimetallic Au4Cu2 nanoclusters

“…[20][21][22] However, the lack of atomic-level precision in the size and alloy composition of traditional nanoparticles shows the difficulties in establishing an accurate relationship between structure and properties. 14,[23][24][25]26 Therefore, a defined structure of a catalyst would be required to tune the catalytic property at the atomic level. [27][28][29] As a result, significant attention has been directed towards creating highly precise architectures and employing ligandprotected metal nanoclusters with atomic-level precision.…”

“…20–22 However, the lack of atomic-level precision in the size and alloy composition of traditional nanoparticles shows the difficulties in establishing an accurate relationship between structure and properties. 14,23–25,26…”

Frank Partial Dislocations in Coplanar Ir/C Ultrathin Nanosheets Boost Hydrogen Evolution Reaction

“…[1][2][3][4] Electrolysis of water to produce hydrogen is the most scalable technology and an essential strategy for producing green hydrogen. [5][6][7] The HER DOI: 10.1002/adma.202310591 during water electrolysis is closely related to the pH of the electrolyte. [8] In acidic solutions, more protons are present, which is advantageous for hydrogen generation.…”