Nanocrystal Array Fabricated to Improve HER Activity NatureComms catalysis HER nanocrystal
By Dr. Priyom Bose, Ph.D.Oct 6 2022Reviewed by Megan Craig, M.Sc. Nanocrystal arrays with precise subnanometer distances can be used to develop novel materials that increase the scope of future applications. Nevertheless, it is not easy to develop aligned nanocrystal arrays with precision at the subnanometer range, using conventional methods.
Trassati’s volcano plot has indicated rhodium or Rh-based materials to be potential catalysts for HER. However, a key disadvantage related to the utilization of Rh for the formation of H2 includes the high adsorption energy of hydrogen on the Rh surface. Additionally, the poor durability of Rh-based materials urges the need for better structural design to achieve effective HER performance.
Characteristic Features of 2D Metastable Metal Oxides Related Stories2D metastable metal oxides have been determined to be an ideal substrate that can overcome the challenges discussed above. Some of the important characteristic features of 2D materials that have increased their applicability include maximum atomic utilization, desirable durability, and ideal activities.
P-Tri-RhO2 was characterized using various analytical tools, such as transmission electron microscopy , scanning electron microscopy , atomic force microscopy , X-ray diffraction , and X-ray spectroscopy . SEM and TEM analysis revealed the 2D ultrathin nanosheet morphology of P-Tri-RhO2. The electrochemical specific surface area of Rh-NA/RhO2 indicated the in situ formation of Rh nanoparticles on the P-Tri-RhO2 substrate. An alteration of 0.45% lattice between face-centered cubic phase Rh and metastable P-Tri-RhO2 promoted an in situ growth of Rh single-crystal nanoarrays whose interparticle gap was 3.709 nanometers.
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