PtPdMo Nanosheets with Controllable Synthesis for Enhanced Oxygen Reduction Reactions

Abstract

Metallic ultrathin nanosheets have drawn increasing attention due to their distinct properties and wide applications. Nonetheless, the successful preparation of metallic ultrathin nanosheets is still a huge challenge because metallic bonds have no direction and tend to form three-dimensional close-packed structures. Here, ultrathin curved PtPdMo nanosheets (UC-PtPdMo NSs) were obtained by controlling the anisotropic growth kinetics through the CO released from Mo­(CO)6. Meanwhile, different doses of PVP and CTAB could induce the formation of ultrathin porous PtPdMo NSs (UP-PtPdMo NSs) and ultrathin PtPdMo NSs (U-PtPdMo NSs). Among them, UC-PtPdMo NSs had the optimal catalytic activity for oxygen reduction reaction (ORR), and its specific and mass activities were 4.1 and 3.6 times as large as those of Pt/C. Moreover, it showed better stability than the other catalysts after 10k cycles. The strengthened catalytic properties might have resulted from the ultrathin structures and the electronic adjustment of Pt by Pd and Mo elements.

High‐Efficient Ultrathin PdCuMo Porous Nanosheets with Abundant Defects for Oxygen Reduction Reaction

“…Electrochemical testing : The electrochemical equipment and the selected electrodes were the same with our previous studies [40,41] . The electrochemical experiments were carried in 0.1 M HClO 4 or 0.1 M KOH.…”

“…The electrochemical equipment and the selected electrodes were the same with our previous studies. [40,41] The electrochemical experiments were carried in 0.1 M HClO 4 or 0.1 M KOH. The CO-stripping curves were scanned from 0.1 to 1.2 V vs. RHE with a scan rate of 50 mV s À 1 in N 2 -saturated HClO 4 .…”

Interfacial built-in electric-field for boosting energy conversion electrocatalysis

“…The oxygen reduction reaction (ORR) is a crucial reaction for many important energy conversion technologies, such as fuel cells, metal-air batteries, and so on. [67][68][69][70][71] Therefore, the ORR performance of a catalyst is of vital significance for determining their energy conversion efficiencies. [72][73][74][75][76][77] Tremendous explorations have been carried out to develop advanced ORR catalysts or effective strategies for promoting the catalytic performance of inherent catalysts.…”

Two-Dimensional Metal Nanostructures: From Theoretical Understanding to Experiment

“…The crumpled nanosheet exhibited lattice spacings of 0.224 and 0.306 nm, corresponding to the (111) plane of fcc PdPtNi nanosheets and the (100) plane of PdO, respectively. The PtPdMo nanosheets were prepared using the solvothermal method with PVP, CTAB, and Mo­(CO) 6 as surfactants and capping agents . The obtained 2D nanostructure had a size of about 80 nm, with an average thickness between 1.32 and 1.67 nm (Figure c and d).…”