Ong Hui Lin
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Preferred name
Ong Hui Lin
Official Name
Ong, Hui Lin
Alternative Name
Ong, Huilin
Ong, H. L.
Lin, Ong Hui
Lin, O. H.
Lin Ong, Hui
Main Affiliation
Scopus Author ID
57189322712
Researcher ID
F-5201-2010

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Publication

Energy efficiency of Briquettes from Queen Pineapple (Ananas Comosus [Linn.] Merr.) wastes using three organic binders

2023 , Michelle S. Carbonell , Al Rey C. Villagracia , Ong Hui Lin , Ma. Kathrina M. Pobre

Pineapple (Ananas comosus [Linn.] Merr.) farms generate a high volume of wastes composed of residual stalks, leaves, roots, and crowns including bruised butterballs which is equivalent to 70–80% of its production. Converting these wastes into biochar briquettes for bioenergy and biofuel application is needed to avoid water and soil contamination. In this work, we investigated the energy efficiency of Queen pineapple (QP) briquettes mixed with different starch binder’s raw material, namely the sweet potato (Ipomoea batatas), cassava (Manihot esculenta), and nami (Dioscorea hispida). The pineapple wastes were dried and carbonized using a drum-type carbonizer, while the sun-dried starch was extracted from the grated raw binder materials. The dried pineapple wastes mixed with the gelatinized starch were molded using a ten-port manual briquetting machine to produce the briquettes. Each set of briquettes was used to boil 500 ml of water, and the following quantities were measured: Water boiling time, length of briquette consumption, and density. Afterwards, the burning efficiency and heat transfer rate per unit mass of briquettes were computed. The results revealed that QP briquettes with Dioscorea hispida binder have the highest energy efficiency based on the mass burning rate and heat transfer rate of 3.71 g min−1 of 40.4 Jg−1 min−1 followed by 3.45 g min−1 and 26.36 4 Jg−1 min−1 for Ipomoea batatas binder, and, lastly, 3.30 g min−1 and 25.68 Jg−1 min−1 for Manihot esculenta binder, respectively. Dioscorea hispida is found to be the best starch binder source among the three crops for producing briquettes from QP wastes.

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First principles investigation on the nitrogen-doped planar aluminene for hydrogen storage application

2020 , G R Pedrosa , A R Villagracia , D S Bayasen , Ong Hui Lin , David M. , N Arboleda , H., Lin.

With the rise of carbon emission daily, a pursuit for cleaner energy such as hydrogen fuel is necessary. Obtaining a good hydrogen storage is one of the main bottleneck to achieve a working hydrogen economy. Materials including two-dimensional systems have been widely investigated for potential hydrogen storage. In this work, the effects of nitrogen on the hydrogen adsorption on planar hexagonal aluminene was studied using density functional theory. Aluminene was decorated with nitrogen at different sites: top, hollow and bridge. Results showed that nitrogen was adsorbed at the top, bridge and hollow sites at a distance of 0.00Ã… to 1.80 Ã… with binding energies of 2.71 eV, 4.88 eV, and 3.44 eV, respectively. Comparing to the pristine aluminene, there was no major difference with its electronic and magnetic properties based on the density of states of the nitrogen-doped aluminene while the nitrogen atom gained some charges from the aluminium atoms based on the charge difference. On the other hand, a hydrogen molecule was adsorbed with binding energies ranging from 13.4meV to 26.3 meV close enough to the adatom on the decorated system. Minimal broadening of energy level was found from the density of states. This work shows that aluminene with nitrogen impurity can adsorb hydrogen molecules. However, high concentration of nitrogen will lower the hydrogen capacity of aluminene.

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One-pot preparation of highly porous paddy waste derived-cellulose-silica nanocomposite membrane separator for advanced performances of supercapacitor

2023 , Md. Asadul Islam , Ong Hui Lin , Nur Atirah Afifah Sezali , Al Rey Villagracia , Hai Linh Tran , Chih-Yi Yeh , Cheng-Kuo Tsai , Ruey-an Doong

A new strategy was demonstrated to produce cellulose nanofibril-silica (CNF–SiO2) nanocomposite membrane separator for supercapacitor by one-pot synthesis of silica (SiO2) nanoparticles using different contents of tetraethyl orthosilicate (TEOS) precursor (0.9, 1.8, 2.7, 3.6 wt%). With the SiO2 nanoparticles acting as the disassembling agent, a highly porous CNF–SiO2 nanocomposite membrane was prepared using a simple solvent casting method. The CNF–SiO2 nanocomposite membrane with 1.8 wt% TEOS content (CNF-C2), exhibited the best properties with high porosity of 61%, electrolyte uptake ability of 260% and ionic conductivity of 5.0 mS cm− 1. Besides, the maximum thermal degradation temperature (Tmax) of the CNF–SiO2 nanocomposite membrane increased from 300 ℃ to 322 ℃, making it suitable for use within the operating temperatures of a supercapacitor. A symmetric supercapacitor assembled with CNF-C2 separator achieved the highest specific capacitance of 179.0 F g− 1 at 0.1 A g− 1 and energy density of 35.8 Wh kg− 1 at a power density of 240.0 W kg− 1. This CNF–SiO2 nanocomposite membrane helped the supercapacitor to achieve excellent electrochemical stability after 10,000 charge-discharge cycles with a capacitance retention and coulombic efficiency of 98.3% and 95.0%, respectively. The presented results proved that the CNF–SiO2 nanocomposite membrane is a good alternative separator in the supercapacitor application.

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