A strategy to promote the ORR electrocatalytic activity by the novel engineering bunched three-dimensional Pd-Cu alloy aerogel

Controllable design of multi-metallic aerogels as efficient electrocatalysts for methanol fuel cells

“…Metallic aerogels assembled from metal nanoparticles (NPs) or other nano-metal building blocks to construct threedimensional (3D) structures have received increasing attention in the eld of electrocatalysis. [1][2][3][4][5] Two advantages have been proposed for aerogels self-assembled on the macroscale, namely, good intrinsic activity and high conductivity inherited from metal NPs to maintain their electrocatalytic activity and high porosity and interconnected networks obtained from the aerogel structure to facilitate the mass and electron transfer, correspondingly. [6][7][8][9][10] Thus, these features enable metallic aerogels to amplify and outperform the activity of the original NPs.…”

“…[6][7][8][9][10] Thus, these features enable metallic aerogels to amplify and outperform the activity of the original NPs. 11 Recently, a variety of metallic aerogels with Pt, Pd, Au, Ag, Cu and Ni components has been developed as highly efficient electrocatalysts towards different reactions, such as the oxygen reduction reaction (ORR), 3 oxygen evolution reaction, 4 carbon dioxide reduction reaction, 12,13 methanol oxidation reaction (MOR), 14,15 ethylene glycol oxidation, 16 and hydrogen evolution reaction, 17 for applications including water electrolysis and fuel cells. For instance, Du 18 and co-workers reported the construction of polyvinylpyrrolidone-modied Pd aerogels composed of 3D nanowire-like networks using laser-generated inorganic-saltstabilized metal nanoparticles, which greatly facilitated the progress of electrocatalytic ethanol oxidation and exhibited enhanced activity, as compared with the commercial Pd/C.…”

Effect of calcium ion concentration on the ORR performance of Pd/C catalysts

“…Limiting current density and half-wave potential are important indicators for judging catalyst activity, and it is generally believed that the larger of the value, the better the electrochemical catalytic effect. 14 With the concentration of Ca 2+ from 0.05 mM to 0.025 mM, the values of these two index parameters are all increasing, indicating that reducing the Ca 2+ concentration is beneficial to the catalytic reaction. When the concentration was too low (0.0125 mM), the half-wave potential of Pd/C 0.0125 (0.905 V) were significantly lower than those of Pd/C 0.05 (0.929 V), Pd/C 0.025 (0.952 V).…”

Interfacial Polarization Triggered by Covalent‐Bonded MXene and Black Phosphorus for Enhanced Electrochemical Nitrate to Ammonia Conversion

“…Type-I is a typical positively centered Nb due to its intrinsic metallic properties. [69] Type-II is BP-polarized Nb. Based on the molecular structure of each intermediate shown in Figure 5a, type-I Nb and type-II Nb in the elliptic region of Figure 5f tend to bind with both sides of N-O bonds in HNO 2 *, respectively, thus synergistically promoting the cleavage of N-O bonds to form NO*.…”