Optimized loading of Pt single atoms from platinic acid solution and the sweet spot for activity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15640%2F25%3A73632987" target="_blank" >RIV/61989592:15640/25:73632987 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.rsc.org/en/content/articlelanding/2025/nr/d5nr03976b" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2025/nr/d5nr03976b</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d5nr03976b" target="_blank" >10.1039/d5nr03976b</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Optimized loading of Pt single atoms from platinic acid solution and the sweet spot for activity

Popis výsledku v původním jazyce

In recent years, platinum single atoms (SAs) have emerged as exceptionally efficient co-catalysts for photocatalytic hydrogen (H2) evolution. In the present work, we systematically investigate the solution parameters that govern the deposition of Pt SAs from dilute H2PtCl6 precursors onto well-defined sputtered anatase TiO2 thin films and evaluate the effect on photocatalytic H2 evolution. We show that both precursor concentration and solution composition critically determine the oxidation state, dispersion, and reactivity of surface-bound Pt species. Ultra-dilute, additive-free solutions (0.001-0.005 mM) enable strong electrostatic adsorption (SEA) and aquation-assisted anchoring of isolated Pt2+ atoms, leading to atomically dispersed Pt-O-Ti surface motifs with maximal H2 evolution per Pt. In contrast, increased ionic strength or unfavorable speciation caused by higher concentration or pH adjustment induces non-selective uptake, formation of Pt(iv)-rich 2D rafts, and diminished catalytic performance. Overall, we show that the placement and photocatalytic activity of Pt SAs are dictated by the pre-reaction deposition chemistry. From a practical view, this study defines a narrow yet actionable parameter window for scalable, efficient SA co-catalyst decoration and establishes the mechanistic basis for performance optimization via precursor-chemistry design.

Název v anglickém jazyce

Optimized loading of Pt single atoms from platinic acid solution and the sweet spot for activity

Popis výsledku anglicky

In recent years, platinum single atoms (SAs) have emerged as exceptionally efficient co-catalysts for photocatalytic hydrogen (H2) evolution. In the present work, we systematically investigate the solution parameters that govern the deposition of Pt SAs from dilute H2PtCl6 precursors onto well-defined sputtered anatase TiO2 thin films and evaluate the effect on photocatalytic H2 evolution. We show that both precursor concentration and solution composition critically determine the oxidation state, dispersion, and reactivity of surface-bound Pt species. Ultra-dilute, additive-free solutions (0.001-0.005 mM) enable strong electrostatic adsorption (SEA) and aquation-assisted anchoring of isolated Pt2+ atoms, leading to atomically dispersed Pt-O-Ti surface motifs with maximal H2 evolution per Pt. In contrast, increased ionic strength or unfavorable speciation caused by higher concentration or pH adjustment induces non-selective uptake, formation of Pt(iv)-rich 2D rafts, and diminished catalytic performance. Overall, we show that the placement and photocatalytic activity of Pt SAs are dictated by the pre-reaction deposition chemistry. From a practical view, this study defines a narrow yet actionable parameter window for scalable, efficient SA co-catalyst decoration and establishes the mechanistic basis for performance optimization via precursor-chemistry design.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nanoscale

ISSN

2040-3364

e-ISSN

2040-3372

Svazek periodika

17

Číslo periodika v rámci svazku

48

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

28104-28111

Kód UT WoS článku

001623302400001

EID výsledku v databázi Scopus

2-s2.0-105022873412