Structurally Disordered Phosphorus-Doped Pt as a Highly Active Electrocatalyst for an Oxygen Reduction Reaction

Abstract

The application of Pt alloy catalysts for oxygen reduction reactions (ORRs) in proton-exchange membrane fuel cells is severely impeded by base metal leaching, since the produced metal ions can result in the degradation of a Nafion membrane by replacing H + and inducing a Fenton reaction. Doping Pt with nonmetal elements can significantly mitigate such problems due to the relative harmlessness of the corrosion products of anions. Herein, we developed a phosphorus-doping strategy, which can greatly boost the ORR performance of Pt. Phosphorus was introduced into the near-surface of commercial Pt/C (denoted as P NS -Pt/C) via a surfactant-free method. Highangle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray photoelectron spectrum (XPS) tests indicate that the introduction of phosphorus induced distortion of the Pt lattice and the downshift of the d-band center. In situ electrochemical Fourier transform infrared (FTIR) spectroscopy with adsorbed CO as a molecule probe further revealed that the introduction of phosphorus can lower the adsorption ability. The ORR mass activity of P NS -Pt/C is as high as 1.00 mA μg Pt −

Tunable Hollow Nanoreactors for In Situ Synthesis of GeP Electrodes towards High‐Performance Sodium Ion Batteries

“…[19] The P2 ps pectrum exhibits four peaks,t he peaks at 129.3 and 130.6 eV can be ascribed to Ge-P, [5,20] and the other two peaks at 129.9 and 130.2 eV correspond to P-P (Figure 4e). [2,21] The C1 ss pectrum can be divided into three peaks.T he strong peak at 284.6 eV can be indexed to C À C/C = C, while the other two peaks at 280.6 and 288.5 eV are the signals of C-N and C-O, respectively (Figure 4f). [22] N1 ss pectrum can be deconvoluted into pyridinic N( 21.1 %), pyrrolic N( 34.7 %), and graphitic N( 44.2 %), respectively.T he ratio of Ne lement in the nitrogen doped carbon is calculated to be 17.6 %, which can improve the electronic conductivity of the carbon matrix (Supporting Information, Figure S6).…”

High activity of step sites on Pd nanocatalysts in electrocatalytic dechlorination

“…Typically, stronger CO surface chemisorption energy would increase the CO binding energy and thus increase the CO stretching frequency (blue-shift); while a stronger CO chemisorption energy indicated high surface reactivity. 33 Hence, the high Stark turn rate (36.7 cm −1 V −1 ) indicated a high activity of alachlor reduction on THH Pd{310} NCs/GC.…”

Cobalt‐Doping Stabilized Active and Durable Sub‐2 nm Pt Nanoclusters for Low‐Pt‐Loading PEMFC Cathode

“…Compared to the Pt 4f 7/2 peak of undoped Pt at 71.68 eV, the Co-doped Pt binding energy of Pt 4f 7/2 is positively shifted (71.74 eV for Co-doped Pt). This indicates a downshift of the d-band center, [18][19] and the downshift weakens the interactions between Pt and OH ad species, thereby enhancing activity toward the ORR. [20] Both the Pt 4f peaks of undoped Pt and Co-doped Pt exhibit the multi-oxidation states Pt 0 and Pt 2+ .…”