Small molecule-assisted synthesis of carbon supported platinum intermetallic fuel cell catalysts.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36316330.
- Also identified by DOI 10.1038/s41467-022-34037-7 and PMC identifier 9622856.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Supported ordered intermetallic compounds exhibit superior catalytic performance over their disordered alloy counterparts in diverse reactions. But the synthesis of intermetallic compounds catalysts often requires high-temperature annealing that leads to the sintering of metals into larger crystallites. Herein, we report a small molecule-assisted impregnation approach to realize the general synthesis of a family of intermetallic catalysts, consisting of 18 binary platinum intermetallic compounds supported on carbon blacks. The molecular additives containing heteroatoms (that is, O, N, or S) can be coordinated with platinum in impregnation and thermally converted into heteroatom-doped graphene layers in high-temperature annealing, which significantly suppress alloy sintering and insure the formation of small-sized intermetallic catalysts. The prepared optimal PtCo intermetallics as cathodic oxygen-reduction catalysts exhibit a high mass activity of 1.08 A mg<sub>Pt</sub><sup>-1</sup> at 0.9 V in H<sub>2</sub>-O<sub>2</sub> fuel cells and a rated power density of 1.17 W cm<sup>-2</sup> in H<sub>2</sub>-air fuel cells.