Pseudo-atomic-scale metals well-dispersed on nano-carbons as ultra-low metal loading oxygen-evolving electrocatalysts

Autor:	Wei-Zhe Xie, Jing-Fang Huang
Rok vydání:	2020
Předmět:	Materials science Electrolysis of water Oxygen evolution chemistry.chemical_element General Chemistry Orders of magnitude (numbers) Oxygen Catalysis Nanoclusters Metal Chemistry Chemical engineering chemistry visual_art Nano visual_art.visual_art_medium
Zdroj:	Chemical Science
ISSN:	2041-6539 2041-6520
DOI:	10.1039/d0sc01348j
Popis:	Solving challenges for the scaling-up, high metal loadings and low turnover frequency (TOF, defined as mol O2 per mol metal per second), of FeNi catalysts in water electrolysis, we report the first discovery of pH tunable tannic acid single molecular layer formed on nano-sized carbons (NCs), which promotes the gram-production of pseudo-atomic-scale FeNi oxyhydroxide nanoclusters well-dispersed on NCs. It results in ultra-low metal loading (0.42 μg cm−2) and remarkably large TOF of 14.03 s−1 for the oxygen evolution reaction, which is three orders of magnitude higher than that of state-of-the-art FeNi catalysts. A “volcano”-shaped activity trend in specific activity and TOF was found to depend on the Fe content in FeNi oxyhydroxide. The micro-morphologies from the atomic-level exposure of active sites and surface spectra analyses confirm the model of synergism between Ni and Fe centers. Sub-nanosized FeNi oxyhydroxide nanoclusters on nano-carbons overcome challenges, high metal loading and low TOF, in water splitting.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::263961f4813977a595aaac49507285d3 https://doi.org/10.1039/d0sc01348j Zobrazit plný text záznamu