Communication Issue
Engineering the high-entropy phase of Pt-Au-Cu nanowire for electrocatalytic hydrogen evolution
Nano Research 2023, 16 (8): 10742-10747
Published: 19 June 2023

Hydrogen economy, as the most promising alternative energy system, relies on the hydrogen production through sustainable water splitting which in turn relies on the high efficiency electrocatalysts. PtAuCu A1-phase alloy has been predicted to be a promising electrocatalyst for the hydrogen evolution. As such preferred phase of Pt-Au-Cu is not thermodynamically favored, herein, we stabilize PtAuCu alloy by engineering the high-entropy phase in the form of nanowire. Density functional theory (DFT) calculations indicate that, in comparison with the ordered phase and segregated phases with discrete hydrogen binding energy, the high-entropy phase provides a diverse combination of site composition to continuously tune the hydrogen binding energy, and thus generate a series of highly active sites for the hydrogen evolution. Reflecting the theoretical prediction, electrochemical tests show that the A1-phase PtAuCu nanowire significantly outperforms its nanoparticle counterpart with phase segregation, toward the electrocatalysis of hydrogen evolution, offering one of the best hydrogen evolution electrocatalysts.

Research Article Issue
Interfacial engineering of Ni/V2O3 for hydrogen evolution reaction
Nano Research 2020, 13 (9): 2407-2412
Published: 17 June 2020

Electrocatalytic water splitting offers a sustainable route for hydrogen production, enabling the clean and renewable alternative energy system of hydrogen economy. The scarcity and high-cost of platinum-group-metal (PGM) materials urge the exploration of high-performance non-PGM electrocatalysts. Herein, a unique hierarchical structure of Ni/V2O3 with extraordinary electrocatalytic performance (e.g., overpotentials as low as 22 mV at 20 mA·cm-2 and 94 mV at 100 mA·cm-2) toward hydrogen evolution reaction in alkaline electrolyte (1 M KOH) is reported. The investigation on the hierarchical Ni/V2O3 with a bimodal size-distribution also offers insight of interfacial engineering that only proper Ni/V2O3 interface can effectively improve H2O adsorption, H2O dissociation as well as H adsorption, for an efficient hydrogen production.

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