Porous Tetrametallic PtCuBiMn Nanosheets with a High Catalytic Activity and Methanol Tolerance Limit for Oxygen Reduction Reactions

Abstract

Porous PtCuBiMn nanosheets are developed with a thickness of ≈3-4 nm. The specific and mass activities of these nanosheets are ten and seven times greater than that of commercial Pt/C catalyst, respectively. PtCuBiMn nanosheets demonstrate superior catalytic performance for the oxygen reduction reaction, as well as resistance to methanol cross-over effects, suggesting that it is a promising catalyst for direct methanol fuel cells.

Gold–Copper Aerogels with Intriguing Surface Electronic Modulation as Highly Active and Stable Electrocatalysts for Oxygen Reduction and Borohydride Oxidation

“…[26] After 10 000 cycles,t he Pt/C benchmark catalyst presents am ore negative shifto f3 4mVi nE 1/2 ,a nd its diffusionlimiting current density significantly reduces from 5.87 to 5.15 mA cm À2 (Figure 4b Figure 6a,t he current achieved by the Au 52 Cu 48 aerogels catalyst is maintained at 92 %o fi ts initial value after a4 0000 st est, whereas the current on commercial Pt/C drops to 63 %o ft he initial value. [29] CA measurementsw ere conducted to examine possible selectivity and crossover effects of the electrocatalysts.A ss hown in sponse in the current for the Au 52 Cu 48 aerogelsc atalyst, whereas the current of Pt/C immediately decreases drastically after adding methanol, which indicates that the Au 52 Cu 48 aerogels catalysts hows good tolerance toward methanol during catalysis of the ORR process, and this hasb een proven to be the result of its higher selectivity for the ORR rathert han methanol oxidation according to our recently reported study. Evolution of the structurea nd compositiono ft he Au 52 Cu 48 aerogels after the stabilityt est (ADT) was further investigated by TEM analysis.…”

Facile Synthesis of Porous Pd3Pt Half‐Shells with Rich “Active Sites” as Efficient Catalysts for Formic Acid Oxidation

“…According to the Vegard's law ( d PdPt = x · d Pd + (1 − x )· d Pt ) through the (220) diffraction peak, the atomic content of Pd and Pt in the Pd 3 Pt half‐shells was determined to be ≈72.3% and 27.7%, respectively, which was in good agreement with the result from EDX analysis. Usually, the reduction sequence of metal precursors is determined by the standard reduction potential . Metals that have high standard reduction‐potentials like Pt ( E θ (PtCl 6 2− /Pt) = 0.726 V) should be reduced before that with low reduction‐potentials like Pd ( E θ (PdCl 4 2− /Pd) = 0.620 V).…”

“…potential. [46,47] Metals that have high standard reduction-potentials like Pt (E θ (PtCl 6 2− /Pt) = 0.726 V) should be reduced before that with low reduction-potentials like Pd (E θ (PdCl 4 2− /Pd) = 0.620 V). However, the reduction sequence was changed in our reaction, which might be influenced by the complexation conditions of the present system.…”

Design of Ultrathin Pt‐Based Multimetallic Nanostructures for Efficient Oxygen Reduction Electrocatalysis

“…Considering that Bi has been utilized to improve the methanol tolerance of Pt catalysts, alloying Pt with Bi is a viable method to design high‐performance ORR catalysts with high methanol tolerance. An interesting PtCuBiMn nanosheet with 3 nm thickness was made ( Figure a,b) by coreduction of Pt(acac) 2 , Cu(acac) 2 , BiCl 3 , and Mn(acac) 2 in the presence of formamide, poly(vinylpyrrolidone) (PVP), and KI at 130 °C . Herein, CO produced by the decomposition of formamide may play a dual role of reducing agent and shape controller for making nanosheets.…”