|About this Abstract
||MS&T22: Materials Science & Technology
||Energy Materials for Sustainable Development
||L-16: Nucleation and Growth of Cu2O: Effect of pH, Potential and Substrate
||Akhilender Jeet Singh, Garima Aggarwal, Sushobhita Chawla, Chandan Das, Balasubramaniam Kavaipatti
|On-Site Speaker (Planned)
Cu2O is electrodeposited on FTO & Au substrates at different overpotentials and in pH 9 & 12 electrolytes. A 3-D instantaneous & progressive nucleation with diffusion-controlled growth is observed in pH 9. The Cu2O/FTO films deposited at low overpotential and in pH 9 are 100 oriented, shifting to 111 at higher overpotentials, while Cu2O/Au maintain 100 orientation even at high overpotentials. The grain size of Cu2O/FTO decreases from 4 to 0.5 μm with increasing potential, whereas increases from 100 to 500 nm for Cu2O/Au. The presence of large induction period (~60 sec) on Au compared to FTO indicates that nucleation sites on Au have similar surface energies than on FTO. For pH 12, nucleation remains 3-D instantaneous and progressive type, however, growth becomes diffusion and charge transfer controlled. The preferred orientation of Cu2O is primarily decided by electrolyte pH as well as potential and is less dependent on polycrystalline substrates.