Writing Engineering Abstracts(49)

8/7/2019 Writing Engineering Abstracts(49)

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Writing Engineering Abstracts(49)

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(1 of 2)(+) Direct methanol fuel cell (DMFC)is a highly feasible alternative for portable energy supply owingto its high power density, efficient start up time, and liquid fuelfed mechanism. However, the development of DMFC is limitedmainly by the slow kinetics of methanol oxidation reaction (MOR),

i.e. a series of proton stripping processes that ultimately leavecarbon monoxide adherent to a catalyst (normally platinum), aphenomenon known as catalyst poisoning. The inability toreduce the excitation power source to a certain order (~W)makes it impossible to commercialize the photo-electrochemicalfuel cell for portable energy applications. Therefore, this

study investigates the feasibility of improving the junction stabilityof Pt and TiO2 to increase significantly the current under lowpower UV illumination. Achieving a compact Pt and TiO2junction can prevent an electron transfer loss from TiO2 to Pt,ultimately achieving a low power, UV driven DMFC.


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(2 of 2) A high junction Pt-TiO2 interface is formed using photoassisted reduction. A reducing agent, i.e. ethanol glycol, is thenintroduced to prevent the residual metal precursor and enhancethe purity of reduced Pt. Next, the coverage of Pt on TiO2 isdetermined based on the precursor concentration, percentage ofreducing agent added, and illumination time. Experimental results indicate that the current significantlyincreases, i.e. more than 10 %, under less than 10W, 254 nmUV illumination. Importantly, a compact Pt-TiO2 junction isformed via photo-assisted reduction.

Among the several crucial parameters studied include precursorconcentration, illumination duration, and the percentage ofreducing agent added. Moreover, in the methanol oxidation test, the current increases by _________% under 4 W, 254 nm UVillumination more than that in the dark.


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(1 of 2) (+) Extensively adopted in the opto-electronics industry, injection molding technology varies thetemperature and pressure in a polymer-based mold to reducethe number of shrinkage defects in products. However, theconventional means of optimizing process parameters is

inaccurate owing to its reliance on the subjective experience ofan operator to eliminate shrinkage defects in products. Therefore, this work presents an injection molding method,capable of accurately estimating shrinkage defects duringproduct manufacturing. Shrinkage of wafer products isreduced based on mold shrinkage compensation. The shrinkage

compensation rates for various materials are then determinedvia simulation. Next, design and manufacturing time issignificantly lowered by using those compensation rates, whichare stored in a database made available for engineers.


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(2 of 2) Simulation results indicate that theproposed injection molding method streamlines productdesign by decreasing the shrinkage rate of defectiveproducts to less than 2%. Importantly,the proposed method ensures pre-compensation of the

mold part, ultimately ensuring high precision in themanufacturing of exterior injection mold parts.


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Writing Engineering Abstracts(49)