Facet-Controlled PdP Nanosheets for Ethanol Electrooxidation

Abstract

Understanding the contribution of crystal facets to the adsorption/desorption behavior of catalytic reaction intermediates is crucial for the design of high-performance electrocatalysts. In this work, we designed a synthesis strategy for ultrathin PdP nanosheets enclosed by different low-index facets, for example, {100}, {110}, and {111}, and studied their performance for electrocatalytic ethanol oxidation reaction (EOR). The results showed that the mass activity of the PdP nanosheets enclosed by the {100} facet was 4.07 A/mg, which was 1.43, 2.56, and 5.58 times as high as that of the PdP {110}, PdP {111}, and commercial Pd/C, respectively. Additionally, the PdP {100} displayed the best stability and the lowest activation energy (E a), which further proved that the atomic configuration on the crystallographic {100} facet was greatly beneficial for EOR. The universality of this synthesis strategy was shown by producing nanocrystals with various amounts of P doping and elemental compositions (e.g., {100}-exposed PdAgP, PdAuP, PdCuP, and PdPtP).

Ternary CuZnPd Nanoalloys Achieving the Synergy of an Electronic Interaction and Bifunctional Catalysis for Efficient Ethanol Electrooxidation

“…In addition, as clearly shown in Figure c and Table S2, the ternary CuZnPd-1 alloy nanoparticles also possess the highest mass activity of 11.8 A mg –1 for EOR (normalized by the actual mass of Pd loaded on the electrode), compared with the binary CuPd alloy nanoparticles (6.0 A mg –1 ), ZnPd alloy nanoparticles (5.8 A mg –1 ), and the commercial Pd/C catalyst (3.2 A mg –1 ). As listed in Figure g, the impressive mass activity of the ternary CuZnPd-1 alloy nanoparticles for EOR also outperforms that of some reported Pd-based nanocatalysts, ,,− illustrating that the ternary CuZnPd-1 alloy nanoparticles are highly efficient in EOR. As we have discussed above, the Cu atoms in the ternary alloy nanoparticles lead to a compressive lattice strain and a decrease in electron cloud density around the Pd atoms.…”

Lattice engineering of noble metal-based nanomaterials via metal–nonmetal interactions for catalytic applications

“…4A). 88 Fig. 4B-D illustrate the typical TEM and XRD characterization of the PdP x nanosheet in the case of exposing {100} f facet.…”

Exposing an Environmentally Friendly Gelation Strategy to Fabricate Modern Three-Dimensional M–Ag (M = Pt and Pd) Aerogels with Excellent Green Energy Generation

“…Additionally, the shoulders relevant to the formation (at above potentials of −0.2 V) and reduction (at a potential of −0.38 V) of MO (M = Pt and Pd) appeared during forward and reverse sweeps, respectively. ,− The electrochemical active surface area (ECSA) has been accepted as a pivotal index for predicting the active sites and electrocatalytic efficiency of each compound. Using previous literature, this factor was explored for three electrocatalysts by integrating the Coulombic charges relevant to the reduction peaks of MO (M = Pt and Pd). ,− Accordingly, the ECSA values for Pd/C, Pt–Ag aerogel, and Pd–Ag aerogel were computed to be 10.6, 68.7, and 83.15 m 2 /g, respectively. This means that Pt–Ag aerogel and Pd–Ag aerogel, as self-supporting 3D electrocatalysts, have more outstanding electrocatalytic performances relative to Pd/C.…”

“…For all electrocatalysts, the shoulders caused by the desorption (forward sweeps) and adsorption (reverse sweeps) of hydrogen appeared in a potential window of −1 to −0.6 V . Additionally, the shoulders relevant to the formation (at above potentials of −0.2 V) and reduction (at a potential of −0.38 V) of MO (M = Pt and Pd) appeared during forward and reverse sweeps, respectively. ,− The electrochemical active surface area (ECSA) has been accepted as a pivotal index for predicting the active sites and electrocatalytic efficiency of each compound. Using previous literature, this factor was explored for three electrocatalysts by integrating the Coulombic charges relevant to the reduction peaks of MO (M = Pt and Pd). ,− Accordingly, the ECSA values for Pd/C, Pt–Ag aerogel, and Pd–Ag aerogel were computed to be 10.6, 68.7, and 83.15 m 2 /g, respectively.…”