Electrochemical Oxygen reduction reaction by Ni-Ln Heterogeneous alloy

Shit, Krishnendu (2025) Electrochemical Oxygen reduction reaction by Ni-Ln Heterogeneous alloy. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS Dissertation of Krishnendu Shit (23MP026)) 23MP026_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (1MB)

Abstract

we have addressed the lattice immiscibility between Ni and Ln to create a series of Ni-Ln heterogeneous alloys using the non-aqueous heat-up colloidal reduction process. 9 Before adding any lanthanoid, the flower-like self-assembly of 18–20 nm Ni NPs consists of 100 wt% hcp phases. After doping the Ln elements into it, the lattice volume increased significantly, leading to the lattice's heterogeneity, which boosts the ORR activity. TEM analysis suggested that Ni-Pr dominates the local structure of (101) and (100) planes. From XPS, inverse charge transfer phenomena were confirmed. Pr doping shows the best H2O2 selectivity up to 96.02% at 0.5V vs RHE, and we can draw an H2O2 selectivity trend depending on volume mismatch.

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