Design, Synthesis, and Evaluation of Noble Metal Nanoparticles and In Situ-Decorated Carbon-Supported Nanoparticle Electrocatalysts Using Hypergolic Reactions

被引：1

作者：

Chalmpes, Nikolaos ^{[1
]}

Tantis, Iosif ^{[1
]}

Alsmaeil, Ahmed Wasel ^{[2
]}

Bourlinos, Athanasios B. ^{[3
]}

Giannelis, Emmanuel P. ^{[1
]}

机构：

[1] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14850 USA

[2] Cornell Univ, Robert Frederick Smith Sch Chem & Biomol Engn, Ithaca, NY 14850 USA

[3] Univ Ioannina, Phys Dept, Ioannina 45110, Greece

来源：

CHEMISTRY OF MATERIALS | 2024年 / 36卷 / 21期

关键词：

PLATINUM NANOPARTICLES; REDUCTION; OXIDATION; CATALYSTS; PERFORMANCE; CHALLENGES; NANOSHEETS;

D O I：

10.1021/acs.chemmater.4c02091

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the first synthesis of metal nanoparticles and supported metal nanoparticles on carbon by using hypergolic reactions. Specifically, we report the synthesis of noble metal nanoparticles (Pt, Ag, and Au) using sodium hydride (NaH) as both an ignition trigger and a reducing agent for the corresponding metal salt precursors. In addition, we report the one-step, in situ synthesis of Pt nanoparticles supported on carbon by adding sucrose as the carbon source. The hypergolically synthesized nanoparticles display elliptical morphology and are more crystalline compared with those conventionally synthesized in solution using sodium borohydride (NaBH4). When tested as electrocatalysts, the hypergolic Pt nanoparticles exhibit more than 2 times higher specific electrochemical active surface area (ECSA) and a higher half-wave potential (E-1/2) of 0.94 V vs the reversible hydrogen electrode (RHE) compared to the conventionally synthesized ones. In addition, the electrocatalyst based on the in situ synthesized carbon that was decorated with the Pt nanoparticles synthesized hypergolically outperforms an analogous, state of the art, commercial PtC system. For example, the former shows an attractive E-1/2 (0.94 V) compared with 0.9 V for the commercial PtC. Accelerated durability tests (ADT) in an alkaline environment add another advantage. After 10 000 cycles, the hypergolically synthesized system shows a smaller reduction of E-1/2 and less degradation compared to the commercial PtC (10 mV compared to similar to 30 mV). The work described here represents the first reported synthesis using hypergolic reactions of metal nanoparticles as well as supported metal nanoparticles. The properties of the resulting electrocatalysts demonstrate the versatility and promise of the new approach in materials synthesis and open new avenues for further investigation as electrocatalysts.

引用

页码：10616 / 10625

页数：10