Microstructures and hydrogen evolution reaction performance of Ru-M(M=Cu, Ni and Nb) system by magnetron sputtering: The mixing enthalpy effect
Source abstract
Abstract
Nanostructured hydrogen evolution reaction (HER) electrocatalysts were prepared by magnetron sputtering. With increasing sputtering power of the Ru target, the catalytic performance of Cu-Ru system improved. Pure Ru sample shows the best performance, due to the larger electrochemical surface area, better hydrophily and smaller electron transfer impedance. No Cu-Ru interaction to improve the catalytic property was observed. This can be attributed to the formation of Cu and Ru nanograins rather than CuRu alloys, due to the repulsive force between Ru and Cu resulted by the positive mixing enthalpy. For Ni-Ru system with a mixing enthalpy close to 0, nanocrystalline NiRu alloys formed. Ru 1Ni 3 showed a high HER performance close to pure Ru due to the synergistic effect. Nb-Ru also shows synergistic interaction to improve the HER performance. Though the active area is smaller than pure Ru, Nb 1Ru 1 sample achieves an overpotential of 39 mV at a current density of 10 mA/cm 2 , lower than that of pure Ru. The main reason can be attributed to the formation of amorphous/crystalline heterojunction due to the negative mixing enthalpy. This promotes the charge transfer at the interface, leading to a smaller electrochemical impedance. The Nb 1Ru 1 sample also shows better stability for 100 h test with an increasing of only 6 mV of the overpotential at 10 mA/cm 2.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Hydrogen Storage and Materials · nanoparticles nucleation surface interactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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