Facile fabrication of hydrangea-like NiSe/FeSe2 nanostructures towards efficient water oxidation

A facile one-pot hydrothermal method has been demonstrated for the fabrication of an innovative hydrangea-like NiSe/FeSe2 nanocatalyst for boosting oxygen evolution reaction (OER). Benefitting from the advantages of the porous architecture, high specific surface area, facilitated electron transfer rate, an ultralow overpotential of merely 210 mV is required for the optimized NiSe/FeSe2(1:1.5) to drive the electrocatalytic water oxidation to reach to 10 mA cm(-2). Moreover, by equipping NiSe/FeSe2(1:1.5) with Pt/C for electrochemical water splitting, a cell potential of merely 1.60 V is demanded to attain 10 mA cm(-2), even outperforming the IrO2 k Pt/C couple. More importantly, the structure and morphology of NiSe/FeSe2(1:1.5) are still well maintained after a longterm chronopotentiometry test. This work opens a new avenue for constructing effective and durable non-precious electrocatalysts for OER. (c) 2022 Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

A facile one-pot hydrothermal method has been demonstrated for the fabrication of an innovative hydrangea-like NiSe/FeSe2 nanocatalyst for boosting oxygen evolution reaction (OER). The NiSe/FeSe2 catalyst exhibits an ultralow overpotential and high efficiency for electrocatalytic water oxidation. Furthermore, the catalyst maintains its structure and morphology after long-term testing, demonstrating its durability and potential for practical applications.