PtPd Nanonets Derived from Pd@PtPd RDs as High-Performance Catalysts for the Oxygen Reduction Reaction

Abstract

Pt-based nanoframes with unique morphologies are one of the most promising catalysts for the oxygen reduction reaction (ORR). In this study, stacked Pd@PtPd core−shell rhombic dodecahedrons (Pd@PtPd RDs) were obtained by a solvothermal method, and then PtPd nanonets (PtPd NNs) were formed by etching of Pd@PtPd RDs with Fe(NO 3 ) 3 and HNO 3 . Combining the time-dependent changes of morphology, atomic ratio, and elemental distribution, the formation mechanism of PtPd NNs was explored. According to the electrochemical tests, the mass and specific activities of PtPd NNs were 4.7 and 7.6 times higher than those of Pt/C and 2.5 and 2.2 times as large as those of Pd@PtPd RDs in an alkaline solution, respectively. Meanwhile, PtPd NNs displayed higher stability than Pd@PtPd RDs and Pt/C. The enhanced catalytic performance might result from the unique open structures, the compressive strain, and the electron transfer from Pd to Pt atoms.

PtPdMo Nanosheets with Controllable Synthesis for Enhanced Oxygen Reduction Reactions

“…The prepared UC-PtPdMo NSs, UP-PtPdMo NSs, and U-PtPdMo NSs were mixed with Vulcan XC-72 to form catalysts with a metal loading of approximately 20% . The electrochemical measurements for the ORR tests were carried out on the an electrochemical workstation (CHI760E) equipped with a rotating-ring disk electrode instrument.…”

“…The prepared UC-PtPdMo NSs, UP-PtPdMo NSs, and U-PtPdMo NSs were mixed with Vulcan XC-72 to form catalysts with a metal loading of approximately 20%. 22 The electrochemical measurements for the ORR tests were carried out on the an electrochemical workstation (CHI760E) equipped with a rotating-ring disk electrode instrument. To prove its excellent ORR properties, the CV curves of the 0.1 M KOH solution were scanned at a rate of 50 mV s −1 to calculate the electrochemical active surface areas (ECSAs).…”

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 .…”