E2M Lab - ITB

Energy and Environmental Materials Laboratory

Highlight

October 10, 2024, Our member Reza Umami received the Best Presenter Award at The International Conference on Physics And Technology of Advanced Materials (ICPTAM) 2024, held at Sanur-Bali, Indonesia, 7-10 October 2024. <Photo>
July 9-11, 2024 Dr. Fitri Aulia Permatasari attended the Global Conference for Women Leaders and Emerging Researchers in Materials Science (GLOW 2024) at NTU Singapore. She was chosen to receive a travel award and presented her research on quantum dots at the conference.
March 11-17, 2024 Dr. Fitri Aulia Permatasari and Yuvita Kiki Wulandari visited the ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, UK to conduct the neutron scattering characterization
23 November 2023 Dr. Fitri Aulia Permatasari was honored as one of the recipients of L’Oréal-UNESCO For Women in Science Indonesia fellowships.
18 November 2023 Dr.Eng. Ferry Iskandar was officially inaugurated as one of the professors of Institut Teknologi Bandung
News in Detik Edu about Dr. Jotti Karunawan, the first graduate of the Nanoscience and Nanotechnology Doctoral Program of ITB. https://www.detik.com/edu/edutainment/d-6839985/itb-luluskan-doktor-sains-dan-teknologi-nano-pertama-bahas-ini-di-disertasinya
14 July 2023 Congratulations to Jotti Karunawan for successfully defending his Doctoral Dissertation!

Latest Publications

Revealing the Dual Role of Ammonia in the Hydroxide Co-Precipitation Synthesis of Cobalt-Free Nickel-Rich LiNi0.9Mn0.05Al0.05O2 (NMA955) Cathode Materials for Lithium-Ion Batteries, Chemistry - An Asian Journal (IF=3.5)

Nickel-rich, cobalt-free LiNi₀.₉Mn₀.₀₅Al₀.₀₅O₂ (NMA955) is a promising cathode material due to its cost-effectiveness and high performance. However, achieving optimal particle size and composition via hydroxide co-precipitation is challenging because of varying metal ion precipitation rates. This study explores the use of ammonia as a complexing agent to control these factors. It was found that ammonia not only regulates particle size but also influences the elemental composition, including aluminum. An ammonia concentration of 1.2 M produced the best results, yielding cathode material with excellent electrochemical performance: a high specific capacity of 188.12 mAh g⁻¹ at 0.1 C, 71.16% capacity retention after 200 cycles at 0.2 C, and 110.30 mAh g⁻¹ at 5 C. Thus, optimizing ammonia concentration is key to synthesizing high-performance NMA955 cathodes.

Microflower CuS:Ni as a negative electrode with battery-type behavior for all transition-metal-sufides-based high-performance asymmetric supercapacitors, Electrochimica Acta (IF=5.5)

This study focuses on the development of high-energy-density asymmetric supercapacitors (ASCs) using transition metal sulfides. A simple hot-injection method was employed to synthesize both positive and negative electrodes. The negative electrode, made of copper sulfide (CuS), was doped with nickel (Ni) to enhance redox activity, as confirmed by electrochemical tests and density functional theory (DFT) analysis. The optimized 20% Ni-doped CuS (CuS:Ni) electrode achieved a high specific capacity of 714 C/g at 1 A/g. When paired with NiS as the positive electrode, the resulting ASC delivered a specific capacity of 435 C/g and an energy density of 61.87 Wh/kg at 517.86 W/kg. These findings demonstrate the potential of all-transition-metal-sulfide-based materials in next-generation high-performance ASCs.

pH-Triggered Phase Transitions, Coexposure of (001) and (110) Facets, and Oxygen Vacancies in BiOCl Photocatalysts, Inorganic Chemistry (IF=4.7)

This study presents a new approach to enhance the photocatalytic performance of bismuth oxychloride (BiOCl) by adjusting the pH during hydrothermal synthesis. By controlling the pH, researchers were able to manipulate the phase composition, facet orientation, and oxygen vacancy concentration in BiOCl. The sample synthesized at pH 7 showed the highest photocatalytic activity in degrading rhodamine B (RhB), due to the coexposure of (001) and (110) crystal facets and a higher number of oxygen vacancies. Density functional theory analysis confirmed that these vacancies improve charge separation, thereby boosting photocatalytic efficiency. This work demonstrates that pH tuning is an effective strategy to optimize BiOCl for environmental and solar energy applications.

N, O-Functionalized Curcumin-Derived Carbon Dots for Reactive Oxygen Species Regulation: Mechanistic Insights into Biomedical Applications, ACS Applied Bio Materials (IF=4.6)

This study explores how reactive oxygen species (ROS) are regulated in nitrogen- and oxygen-functionalized curcumin-derived carbon dots (Cur-CDs) using both experiments and time-dependent density functional theory (TD-DFT). The Cur-CDs were synthesized through a green hydrothermal method, producing water-soluble nanoparticles under 10 nm in size, with broad UV–NIR absorption and strong blue fluorescence. They demonstrated a 29.6% photothermal conversion efficiency and exhibited both light emission and heat dissipation behaviors. TD-DFT results suggest that certain nitrogen surface groups help lower the singlet–triplet energy gap (to 0.33 eV), enhancing ROS generation. In vitro tests showed selective toxicity toward liver cancer cells (HepG2) with effective cellular uptake, indicating their potential use in cancer diagnosis and treatment. Overall, Cur-CDs emerge as sustainable, multifunctional nanomaterials with strong promise for biomedical applications.

Energy and Environmental Materials Laboratory

Department of Physics, Faculty of Mathematics and Natural Sciences,

Institut Teknologi Bandung

Jl. Ganesha No 10, Bandung, Indonesia 40132

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