Colloidal Synthesis of Nickel Arsenide Nanocrystals for Electrochemical Water Splitting.

Autor: Bellato F; Istituto Italiano di Tecnologia (IIT), Via Morego 30, Genova16163, Italy.; Università degli studi di Genova (UniGe), Via Dodecaneso 31, Genova16146, Italy., Ferri M; Istituto Italiano di Tecnologia (IIT), Via Morego 30, Genova16163, Italy., Annamalai A; Istituto Italiano di Tecnologia (IIT), Via Morego 30, Genova16163, Italy.; Università degli studi di Genova (UniGe), Via Dodecaneso 31, Genova16146, Italy., Prato M; Istituto Italiano di Tecnologia (IIT), Via Morego 30, Genova16163, Italy., Leoncino L; Istituto Italiano di Tecnologia (IIT), Via Morego 30, Genova16163, Italy., Brescia R; Istituto Italiano di Tecnologia (IIT), Via Morego 30, Genova16163, Italy., De Trizio L; Istituto Italiano di Tecnologia (IIT), Via Morego 30, Genova16163, Italy., Manna L; Istituto Italiano di Tecnologia (IIT), Via Morego 30, Genova16163, Italy.
Jazyk: angličtina
Zdroj: ACS applied energy materials [ACS Appl Energy Mater] 2023 Jan 09; Vol. 6 (1), pp. 151-159. Date of Electronic Publication: 2022 Dec 23.
DOI: 10.1021/acsaem.2c02698
Abstrakt: We report a detailed study on the first colloidal synthesis of NiAs nanocrystals. By optimizing the synthesis parameters, we were able to obtain trioctylphosphine-capped NiAs nanoplatelets with an average diameter of ∼10 nm and a thickness of ca. 4 nm. We then studied the performance of such NiAs nanocrystals as electrocatalysts for electrochemical water splitting reactions, namely, acidic hydrogen evolution reaction (HER) and alkaline oxygen evolution reaction (OER). These nanocrystals were found to be the most HER active ones among the transition metal arsenides reported to date despite exhibiting less than 40 h of stability under benchmark operative conditions (i.e., -10 mA cm geo -2 ). When tested as alkaline OER electrocatalysts, our NiAs nanocrystals behaved as a pre-catalyst and transformed superficially into an active Ni-oxy/hydroxide. As a result, NiAs nanocrystals featured an OER activity higher than that of benchmark Ni 0 nanocrystals. Noticeably, the OER performance, in terms of , was retained for up to 60 h of continuous operation. The present study highlights how transition metal arsenides, whose structural features could be successfully controlled through a proper tuning of the synthetic parameters, might represent an emerging class of materials for electrocatalytic applications.
Competing Interests: The authors declare no competing financial interest.
(© 2022 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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