Day 2 :
- Materials Science & Engineering
Monash University, Malaysia.
Professor Chong is an Associate Professor at Monash University Malaysia. He is also holding several adjunct positions and a prestigious fellowship, including a Visiting Professor at the University of Ulsan, Republic of Korea; a Senior Research Fellow at the University of South Australia; a Visiting Scientist at the Max Planck Institute for Chemical Energy Conversion, Germany; and being awarded the prestigious Royal Society Newton Advanced Fellowship (UK) in collaboration with University College London. To date, he has published close to 130 publications in journals, conference proceedings, book and book chapters, and technical reports.
Solar energy being the largest renewable energy source on earth is an attractive energy source option that could be harnessed to electrify the cities of future. Among the various available solar-based technologies, the conversion of solar into storable form of hydrogen (H2) energy via the photoelectrochemical (PEC) technology is a promising way to harness the great benefits from the Sun. This is achieved through the application of nanostructured semiconductor photoelectrodes in an electrochemical cell, whereby water molecules are dissociated into H2 and oxygen through the sequential PEC reactions occurring on the semiconductor surfaces. To date, however, almost all the singular semiconductor photoelectrodes used exhibited poor performance and low efficiency during the solar H2 fuel conversion. The effective separation of photogenerated charge carriers in photoelectrodes is a key to alleviate this technical issue. This presentation outlines the photogenerated charge transfer properties and PEC water splitting ability in various nanostructured semiconductor thin films and composites. Specifically, singular and composite semiconductor materials of α-Fe2O3, BiVO4, and MoO3 synthesized on fluorine-doped tin oxide as active photoelectrodes used for solar energy conversion and storage are discussed. Additionally, the role and mechanism of metal and non-metal dopants on the photogenerated charge transfer properties of semiconductor thin films and composites are elucidated. These are further interpreted using the outcomes from an advanced suite of characterisation methods, including FE-SEM, EDX, XPS, XRD and FTIR, and EIS. It is believed that the fundamental understanding gained through our studies is essential and helpful to design high-performance photoelectrodes for the application in PEC water splitting.
Sheffield Hallam University, UK
Montadhar Almoussawi is a PhD student working on a project about friction stir welding of steel alloys, he is doing modelling and simulation for the process, tool optimisation and many experimental including SEM_EDS, XRD residual stress analysis and heat treatments. The project aim is to control the welding parameters in order to produce sound welds.
The recants findings in unpublished work on friction stir welding of DH36 steel carried out at TWI company shows elements segregation of Mn, Si, O, Al when the welding speeds exceeds 500RPM-400 mm/min. The mechanism of this segregation is not fully understood and the presence of Oxygen within this segregated elements is also needs investigation. This work investigate for the first time the elements segregation of DH36 steel by carrying out many heat treatments in within ranges of temperatures 1200-1500 and different cooling rates. Two welding speeds were also used during the welding process, low welding speeds (100mm/min, 200RPM) and high welding speeds (400mm/min, 550RPM). The results showed that segregation is only starting when the temperature exceeds 1400 and the complete segregation of Mn, Si, O, Al is occur at 1450C and also is associated with acicular ferrite formation. It is found also high rotational speeds exceeds 500RPM are causing a local melting at advancing-trailing side. The study is aim to estimate peaks temperatures limits that is not causing segregation by choosing the suitable tool rotational and traverse speeds.