Colloidal Ni–Co–Sn nanoparticles as efficient electrocatalysts for the methanol oxidation reaction

Abstract

Ni–Co–Sn alloys show improved performance toward the methanol oxidation reaction in alkaline media.

Co–Sn Nanocrystalline Solid Solutions as Anode Materials in Lithium‐Ion Batteries with High Pseudocapacitive Contribution

“…We hypothesized that this Sn‐rich surface was related to a slight oxidation of the NPs exposed to ambient conditions. We believe that air exposure resulted in a slight restructuration of the alloy owing to the higher affinity of Sn for oxygen, which drives the diffusion of Sn to the surface …”

Unusual Effect of Trace Water on the Structure and Activity of NixCo1−x Electrocatalysts for the Methanol Oxidation Reaction

“…Moreover, the position of the anodic peak shifts positively to a higher potential whereas the corresponding cathodic potential shifts to the negative direction with increasing scan rate. These shifts could be attributed to electrochemical polarization and the limitation of reaction kinetics, resulting in the formation of NiOOH species that would be insufficient at higher scan rates …”

“…These shifts could be attributed to electrochemical polarization and the limitation of reactionk inetics, resulting in the formation of NiOOH speciest hat would be insufficient at higher scan rates. [27,65] Figure 5c shows that the anodic and cathodic peak current densities have ag ood linear relationship with the sweep rate at low sweep rate, indicating that this is as urface-controlled process and the formationo fN i 2 + /Ni 3 + is dominant. [22,66] The second important point to explain the synergy effect can be illustrated by the different surfacec overage of redox species Ni 2 + /Ni 3 + ,w hichcan be calculated by Equation (9):…”

“…Various synthetic methods have been proposed, such as the microemulsion method, microwave radiation synthesis, polyol reduction, and electrodeposition, which are effective for the preparation of nickel‐based catalysts with various morphologies and anisotropy, for example, Ni–Co nanoflowers, nanoneedles, self‐assembled Ni–Co nanoparticles, dendrite‐like Ni–Cu alloy, and Ni–Co–Sn alloy nanoparticles . Cu/NiCu nanowires synthesized by the microemulsion method showed much higher activities than nickel nanoparticles in oxidizing methanol .…”

“…[12][13][14] Various synthetic methods have been proposed, such as the microemulsion method, [15,16] microwaver adiation synthesis, [17,18] polyol reduction, [19,20] and electrodeposition, [21][22][23] which are effective for the preparation of nickel-based catalysts with variousm orphologies and anisotropy,f or example, Ni-Co nanoflowers, [19,24] nanoneedles, [15] self-assembled Ni-Co nanoparticles, [25] dendrite-like Ni-Cu alloy, [26] and Ni-Co-Sn alloy nanoparticles. [27] Cu/NiCu nanowires synthesized by the microemulsion methods howed much highera ctivities than nickel nanoparticles in oxidizing methanol. [28] The Ni-MnO x /C nanoparticles synthesized by Abdel Hameed using am icrowave-assisted method exhibited several times higher catalytic performance than ordinaryN i/C.…”