Iron- and Cobalt-Doped Palladium/Carbon Nanoparticles as Catalysts for Formic Acid Oxidation

Abstract

Doping heterogeneous atoms is an effective way of improving the catalytic performance of Pd nanocatalysts. This letter reports a facile way of enhancing the catalytic efficiency of Pd atoms by doping Fe/Co atoms. The optimum compositions of PdFe and PdCo nanoparticles can be synthesized by precisely controlling the doping amount of Fe/Co atoms. The PdFe0.64/C and PdCo0.70/C nanoparticles show enhanced mass activity (1.99 and 1.77 mA μgPd –1) and specific activity (4.36 and 4.15 mA cm–2) in the formic acid oxidation reaction, which are 8.3/7.4 and 3.6/3.4 times higher than that of the undoped Pd/C nanoparticle.

Phosphorus-Doped PdSn Nanocatalyst with Abundant Defective Atoms for Enhanced Methanol Oxidation

“…This is mainly because phosphorus atoms were doped in the oleylamine system. Residual oleylamine will adsorb on the catalyst surface and thus reduce the ECSAs of the catalyst . The MeOR activities of the phosphorus-doped PdSnP/C nanocatalysts, undoped PdSn/C nanocatalyst, and commercial Pd/C nanocatalyst are recorded in N 2 -saturated 1 M methanol + 1 M KOH solutions at room temperature at a sweeping rate of 50 mV s –1 in the potential range of 0.05–1.2 V versus RHE (Figure a,b).…”

“…Residual oleylamine will adsorb on the catalyst surface and thus reduce the ECSAs of the catalyst. 29 The MeOR activities of the phosphorus-doped PdSnP/C nanocatalysts, undoped PdSn/C nanocatalyst, and commercial Pd/C nanocatalyst are recorded in N 2 -saturated 1 M methanol + 1 M KOH solutions at room temperature at a sweeping rate of 50 mV s −1 in the potential range of 0.05−1.2 V versus RHE (Figure 4a,b). To have a better understanding of the mass and surface effects, the kinetic current is normalized to Pd mass (j k,mass ) and ECSA (j k,specific ) (Figure 4c, and Table S3).…”

“…The electron structure of the palladium atom can be changed by doping, and the catalytic efficiency can be improved by the synergistic effect of the two elements . At present, commonly used doping atoms are Au, Cr, Fe, Co, H, C, N, S, and P. − Among them, the doping of phosphorus atoms shows its unique charm. − The phosphorus atom is a kind of small radius atom, which usually enters the lattice gap of palladium after doping into the palladium nanocatalysts, thus changing the arrangement of palladium atoms from a crystalline structure to an amorphous structure . This structural change can effectively change the adsorption energy of palladium atoms to the intermediate products of catalytic reaction, which can improve the electrocatalytic efficiency .…”

Pd3Co1 Alloy Nanocluster on the MWCNT Catalyst for Efficient Formic Acid Electro-Oxidation

“…Zhang et al fabricated a PdCo Nds-RGO catalyst exhibiting the excellent peak current density toward the FAOR [ 22 ]. Li et al prepared a PdCo 0.70 /C catalyst showing an enhanced mass activity toward the FAOR [ 23 ]. Hence, PdCo-based catalysts have the great potential in a DFAFC.…”

Tuning the surface structure of Cu2O@Pt for enhanced ethanol electrooxidation

“…The specific electrochemical active surface area (ECSA) can be used to reflect the catalytic properties of the catalyst. 41,42 Therefore, the cyclic voltammetry curves (25 1C, 50 mV s À1 , 0.05-1.2 V) of the Cu 2 O@Pt/C nanocatalysts with different contents of platinum and commercial Pt/C catalyst are tested (Fig. S8 and S9, ESI †).…”