saiful islam | American International University-Bangladesh (original) (raw)

Papers by saiful islam

Chemical Physics Letters, 2017

Pyro-synthesis Electrochemical properties Li-ion batteries a b s t r a c t Rhombohedral Li 2 NaV ... more Pyro-synthesis Electrochemical properties Li-ion batteries a b s t r a c t Rhombohedral Li 2 NaV 2 (PO 4) 3 is very attractive cathode material for lithium-ion battery (LIB) application due to its single voltage plateau at 3.7 V that provides a constant output power. Here, for the first time, we report a direct and simple synthesis of high performance carbon-coated rhombohedral Li 2 NaV 2 (PO 4) 3 (LNVP/C) nanoflake cathode using a pyro-synthesis technique. The cathode demonstrates long cycle stability (100% capacity retention over 300 cycles) and high rate capabilities (77 and 55 mAh g À1 at 6.4 and 12C, respectively). The present study may facilitate a simple and low-cost preparation technique towards high performance cathode materials for advanced LIB applications.

Springer Nature, 2023

The use of general descriptive names, registered names, trademarks, service marks, etc. in this p... more The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.

Journal of Energy Chemistry, 2017

In this study, we report the cost-effective and simple synthesis of carbon-coated α-MnO 2 nanopar... more In this study, we report the cost-effective and simple synthesis of carbon-coated α-MnO 2 nanoparticles (α-MnO 2 @C) for use as cathodes of aqueous zinc-ion batteries (ZIBs) for the first time. α-MnO 2 @C was prepared via a gel formation, using maleic acid (C 4 H 4 O 4) as the carbon source, followed by annealing at low temperature of 270 °C. A uniform carbon network among the α-MnO 2 nanoparticles was observed by transmission electron microscopy. When tested in a zinc cell, the α-MnO 2 @C exhibited a high initial discharge capacity of 272 mAh/g under 66 mA/g current density compared to 213 mAh/g, at the same current density, displayed by the pristine sample. Further, α-MnO 2 @C demonstrated superior cycleability compared to the pristine samples. This study may pave the way for the utilizing carbon-coated MnO 2 electrodes for aqueous ZIB applications and thereby contribute to realizing high performance eco-friendly batteries.

Journal of Materials Chemistry A, 2017

Aqueous Zn-ion batteries (ZIBs) have emerged as promising and eco-friendly next-generation energy... more Aqueous Zn-ion batteries (ZIBs) have emerged as promising and eco-friendly next-generation energy storage systems to substitute lithium-ion batteries. Therefore, discovering new electrode materials for ZIBs with high performance and unraveling their electrochemical reactions during Zn-ion insertion/ extraction are of great interest. Here, we present, for the first time, tunnel-type b-MnO 2 nanorods with exposed (101) planes, prepared via a facile microwave-assisted hydrothermal synthesis within only 10 min, for use as a high performance cathode for ZIBs. In contrast to its bulk counterpart, which showed no electrochemical reactivity, the present b-MnO 2 nanorod electrode exhibited a high discharge capacity of 270 mA h g À1 at 100 mA g À1 , high rate capability (123 and 86 mA h g À1 at 528 and 1056 mA g À1 , respectively), and long cycling stability (75% capacity retention with 100% coulombic efficiency at 200 mA g À1) over 200 cycles. The Zn-ion storage mechanism of the cathode was also unraveled using in situ synchrotron, ex situ X-ray diffraction, ex situ X-ray photoelectron spectroscopy, and ex situ X-ray absorption spectroscopy. Our present study indicates that Zn intercalation occurred via a combination of solid solution and conversion reactions. During initial cycles, the b-MnO 2 cathode was able to maintain its structure; however, after prolonged cycles, it transformed into a spinel structure. The present results challenge the common views on the b-MnO 2 electrode and pave the way for the further development of ZIBs as cost-effective and environmentally friendly next-generation energy storage systems.

Chemical Communication, 2019

We explore NaV 6 O 15 (NVO) nanorod cathodes prepared by a sol-gel method for aqueous rechargeabl... more We explore NaV 6 O 15 (NVO) nanorod cathodes prepared by a sol-gel method for aqueous rechargeable zinc-ion battery applications for the first time. The NVO cathode delivers a high capacity of 427 mA h g À1 at 50 mA g À1 current density. Furthermore, based on the mass of the active materials, it exhibits a high energy density of 337 W h kg À1 .

Journal of Materials Chemistry A, 2019

Aqueous rechargeable zinc-ion batteries (ARZIBs) have drawn enormous attention because of their l... more Aqueous rechargeable zinc-ion batteries (ARZIBs) have drawn enormous attention because of their lowcost and eco-friendly cell components. However, designing high-performance cathode materials towards practical application of ARZIBs remains a major challenge. Therefore, in this contribution, a comprehensive study on K + intercalated V 2 O 5 (KVO) nanorods with exposed facets as a highperformance cathode for ARZIBs is presented. The KVO cathode exhibits remarkable discharge capacities of 439 and 286 mAh g À1 at current densities of 50 and 3000 mA g À1 , respectively. Furthermore, it recovers 96% of the capacity after 1500 cycles at 8000 mA g À1. Impressively, the Zn/KVO battery offers a specific energy of 121 W h kg À1 at high specific power of 6480 W kg À1. The storage mechanism of the KVO cathode in an ARZIB is systematically elucidated using in operando synchrotron X-ray diffraction, ex situ synchrotron X-ray absorption spectroscopy, ex situ TEM analyses and firstprinciples calculations. The superior performance of the cathode is attributed to its unique exposed layer structure with high surface energy, high conductivity and low migration barrier for Zn 2+ migration. This study provides insight into designing high-performance cathode materials for ARZIBs and other electrochemical systems.

Nanomaterials

Lithium-ion batteries (LIBs) have been considered an easily accessible battery technology because... more Lithium-ion batteries (LIBs) have been considered an easily accessible battery technology because of their low weight, cheapness, etc. Unfortunately, they have significant drawbacks, such as flammability and scarcity of lithium. Since the components of zinc-ion batteries are nonflammable, nontoxic, and cheap, AZIBs could be a suitable replacement for LIBs. In this article, the advantages and drawbacks of AZIBs over other energy storage devices are briefly discussed. This review focused on the cathode materials and electrolytes for AZIBs. In addition, we discussed the approaches to improve the electrochemical performance of zinc batteries. Here, we also discussed the polymer gel electrolytes and the electrodes for flexible zinc-ion batteries (FZIBs). Moreover, we have outlined the importance of temperature and additives in a flexible zinc-ion battery. Finally, we have discussed anode materials for both AZIBs and FZIBs. This review has summarized the advantages and disadvantages of AZ...

Manganese (Mn)-based cathode materials have garnered huge research interest for rechargeable aque... more Manganese (Mn)-based cathode materials have garnered huge research interest for rechargeable aqueous zinc-ion batteries (AZIBs) due to the abundance and low cost of manganese and the plentiful advantages of manganese oxides including their different structures, wide range of phases, and various stoichiometries. A novel in situ generated Mn-deficient ZnMn 2 O 4 @C (Mn-d-ZMO@C) nanoarchitecture cathode material from self-assembly of ZnO-MnO@C for rechargeable AZIBs is reported. Analytical techniques confirm the porous and crystalline structure of ZnO-MnO@C and the in situ growth of Mn deficient ZnMn 2 O 4 @C. The Zn/Mn-d-ZMO@C cell displays a promising capacity of 194 mAh g −1 at a current density of 100 mA g −1 with 84% of capacity retained after 2000 cycles (at 3000 mA g −1 rate). The improved performance of this cathode originates from in situ orientation, porosity, and carbon coating. Additionally, first-principles calculations confirm the high electronic conductivity of Mn-d-ZMO@C cathode. Importantly, a good capacity retention (86%) is obtained with a year-old cell (after 150 cycles) at 100 mA g −1 current density. This study, therefore, indicates that the in situ grown Mn-d-ZMO@C nanoarchitecture cathode is a promising material to prepare a durable AZIB.