Abdul Khayum Mohammed
@cusat.ac.in
Postdoc
Cochin University of Science and Technology
EDUCATION
Ph D in Chemical Science, CSIR-NCL Pune, India, 2019
M Sc Applied Chemistry, CUSAT, Cochin, India, 2014
B Sc Chemistry, St Thomas' College, Trichur, India, 2012.
RESEARCH, TEACHING, or OTHER INTERESTS
Materials Science, Renewable Energy, Sustainability and the Environment
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Abdul Khayum Mohammed, Safa Gaber, Jésus Raya, Tina Skorjanc, Nada Elmerhi, Sasi Stephen, Pilar Pena Sánchez, Felipe Gándara, Steven J. Hinder, Mark A. Baker,et al.
Springer Science and Business Media LLC
AbstractThe ordered porous frameworks like MOFs and COFs are generally constructed using the monomers through distinctive metal-coordinated and covalent linkages. Meanwhile, the inter-structural transition between each class of these porous materials is an under-explored research area. However, such altered frameworks are expected to have exciting features compared to their pristine versions. Herein, we have demonstrated a chemical-induction phase-engineering strategy to transform a two-dimensional conjugated Cu-based SA-MOF (Cu-Tp) into 2D-COFs (Cu-TpCOFs). The structural phase transition offered in-situ pore size engineering from 1.1 nm to 1.5–2.0 nm. Moreover, the Cu-TpCOFs showed uniform and low percentage-doped (~ 1–1.5%) metal distribution and improved crystallinity, porosity, and stability compared to the parent Cu-Tp MOF. The construction of a framework from another framework with new linkages opens interesting opportunities for phase-engineering.
Swati Singh, Abdul Khayum Mohammed, Ali Abdulkareem AlHammadi, Dinesh Shetty, and Kyriaki Polychronopoulou
Elsevier BV
Nada Elmerhi, Khadega Al-Maqdi, Khawlah Athamneh, Abdul Khayum Mohammed, Tina Skorjanc, Felipe Gándara, Jesus Raya, Simon Pascal, Olivier Siri, Ali Trabolsi,et al.
Elsevier BV
Abdul Khayum Mohammed, Jésus Raya, Ajmal Pandikassala, Matthew A. Addicoat, Safa Gaber, Mohamed Aslam, Liaqat Ali, Sreekumar Kurungot, and Dinesh Shetty
Wiley
AbstractHydrogen‐bonded organic frameworks (HOFs) are ordered supramolecular solid structures, however, nothing much explored as centimetre‐scale self‐standing films. The fabrication of such crystals comprising self‐supported films is challenging due to the limited flexibility and interaction of the crystals, and therefore studies on two‐dimensional macrostructures of HOFs are limited to external supports. Herein, we introduce a novel chemical gradient strategy to fabricate a crystal‐deposited HOF film on an in situ‐formed covalent organic polymer film (Tam‐Bdca‐CGHOF). The fabricated film showed versatility in chemical bonding along its thickness from covalent to hydrogen‐bonded network. The kinetic‐controlled Tam‐Bdca‐CGHOF showed enhanced proton conductivity (8.3×10−5 S cm−1) compared to its rapid kinetic analogue, Tam‐Bdca‐COP (2.1×10−5 S cm−1), which signifies the advantage of bonding‐engineering in the same system.
Abdul Khayum Mohammed, Jisha Kuttiani Ali, Mahira Bashri Selman Kuzhimully, Matthew A. Addicoat, Sabu Varghese, Maria Baias, Emad Alhseinat, and Dinesh Shetty
Elsevier BV
Abdul Khayum Mohammed, Pilar Pena-Sánchez, Ajmal Pandikassala, Safa Gaber, Ayesha A. AlKhoori, Tina Skorjanc, Kyriaki Polychronopoulou, Sreekumar Kurungot, Felipe Gándara, and Dinesh Shetty
Royal Society of Chemistry (RSC)
We have demonstrated a facile, scalable, and green synthetic route to produce a novel class of semiconductive 2D-c-MOFs (SA-MOFs). This novel MOF chemistry opens rich opportunities for the exploration of functionally diverse open frameworks.
Kayaramkodath C. Ranjeesh, Sukhjot Kaur, Abdul K. Mohammed, Safa Gaber, Divyani Gupta, Khaled Badawy, Mohamed Aslam, Nirpendra Singh, Tina Skorjanc, Matjaž Finšgar,et al.
Wiley
AbstractThe electrocatalytic nitrogen reduction reaction (NRR) driven by renewable electricity provides a green synthesis route for ammonia (NH3) production under ambient conditions but suffers from a low conversion yield and poor Faradaic efficiency (F.E.) because of strong competition from hydrogen evolution reaction (HER) and the poor solubility of N2 in aqueous systems. Herein, an in situ proton filter covalent organic framework catalyst (Ru‐Tta‐Dfp) is reported with inherent Ruthenium (Ru) sites where the framework controls reactant diffusion by suppressing proton supply and enhancing N2 flux, causing highly selective and efficient catalysis. The smart catalyst design results in a remarkable ammonia production yield rate of 2.03 mg h−1 mgcat−1 with an excellent F.E. of ≈52.9%. The findings are further endorsed with the help of molecular dynamics simulations and control COF systems without in situ proton filter feasibility. The results point to a paradigm shift in engineering high‐performance NRR electrocatalysts for more feasible green NH3 production.
Tina Skorjanc, Khaja Mohaideen Kamal, Ayesha Alkhoori, Gregor Mali, Abdul Khayum Mohammed, Zouhair Asfari, Kyriaki Polychronopoulou, Blaž Likozar, Ali Trabolsi, and Dinesh Shetty
American Chemical Society (ACS)
Metal nanoparticles are potent reaction catalysts, but they tend to aggregate, thereby limiting their catalytic efficiency. Their coordination with specific functional groups within a porous structure prevents their aggregation and facilitates the mass flow of catalytic starting materials and products. Herein, we use a thiacalix[4]arene-based polymer as a porous support with abundant docking sites for Au nanoparticles. The sulfur atoms bridging the phenolic subunits of thiacalix[4]arene serve as Lewis basic sites that coordinate Au atoms. Therefore, this approach takes advantage of the functional groups inherent in the monomer and avoids laborious postsynthetic modifications of the polymer. The presented system was tested for visible-light-driven photocatalytic CO2 reduction, where it showed adequate ability to generate 6.74 μmol g–1 CO over the course of 4 h, while producing small amounts of the CH4 product. This study aims to stimulate interest in the design and development of synthetically simpler porous polymer supports for various metal nanoparticles in catalytic and other applications.
Abdul Khayum Mohammed, Ayesha A. Al Khoori, Matthew A. Addicoat, Sabu Varghese, Israa Othman, Maguy Abi Jaoude, Kyriaki Polychronopoulou, Maria Baias, Mohammad Abu Haija, and Dinesh Shetty
Wiley
AbstractThe ordered open organic frameworks membranes are attractive candidates for flow‐assisted molecular separations. The physicochemical properties of such membranes mostly depend on their selectively chosen functional building blocks. In this work, we have introduced a novel concept of functional switchability of three‐dimensional covalent organic framework (3D‐COF) membranes through a simple solvent‐influenced fragmentation method. This room‐temperature interfacial synthesis provides free‐standing 3D‐COF membranes with distinct physicochemical properties from the same building monomers. Notably, the change of solvent from chloroform to ethyl acetate switches the membrane property from hydrophilic (water contact angle 60°) to hydrophobic (water contact angle 142°) nature. The hydrophobic 3D‐COF membrane selectively passes oil molecules from an oil–water emulsion with a gravitational flux of 1536 L m−2 h−1.
Tina Skorjanc, Dinesh Shetty, Mahmoud Elcheikh Mahmoud, Felipe Gándara, Jose Ignacio Martinez, Abdul Khayum Mohammed, Sandra Boutros, Areej Merhi, Elissa O. Shehayeb, Christa A. Sharabati,et al.
American Chemical Society (ACS)
Photocatalytic CO2 reduction into formate (HCOO-) has been widely studied with semiconductor and molecule-based systems, but it is rarely investigated with covalent organic frameworks (COFs). Herein, we report a novel donor-acceptor COF named Co-PI-COF composed of isoindigo and metallated porphyrin subunits that exhibits high catalytic efficiency (∼50 μmol formate g-1 h-1) at low-power visible-light irradiation and in the absence of rare metal cocatalysts. Density functional theory calculations and experimental diffuse-reflectance measurements are used to explain the origin of catalytic efficiency and the particularly low band gap (0.56 eV) in this material. The mechanism of photocatalysis is also studied experimentally and is found to involve electron transfer from the sacrificial agent to the excited Co-PI-COF. The observed high-efficiency conversion could be ascribed to the enhanced CO2 adsorption on the coordinatively unsaturated cobalt centers, the narrow band gap, and the efficient transfer of the charge originating from the postsynthetic metallation. It is anticipated that this study will pave the way toward the design of new simple and efficient catalysts for photocatalytic CO2 reduction into useful products.
Tina Skorjanc, Dinesh Shetty, Felipe Gándara, Simon Pascal, Nawavi Naleem, Salma Abubakar, Liaqat Ali, Abdul Khayum Mohammed, Jesus Raya, Serdal Kirmizialtin,et al.
American Chemical Society (ACS)
Azacalix[n]arenes (ACAs) are lesser-known cousins of calix[n]arenes that contain amine bridges instead of methylene bridges, so they generally have higher flexibility due to enlarged cavities. Herein, we report a highly substituted cationic azacalix[4]arene-based covalent organic framework (ACA-COF) synthesized by the Zincke reaction under microwave irradiation. The current work is a rare example of a synthetic strategy that utilizes the chemical functionalization of an organic macrocycle to constrain its conformational flexibility and, thereby, produce an ordered material. Considering the ACA cavity dimensions, and the density and diversity of the polar groups in ACA-COF, we used it for adsorption of uric acid and creatinine, two major waste products generated during hemodialysis treatment in patients with renal failure. This type of application, which has the potential to save ∼400 L of water per patient per week, has only been recognized in the last decade, but could effectively address the problem of water scarcity in arid areas of the world. Rapid adsorption rates (up to k = 2191 g mg–1 min–1) were observed in our COF, exceeding reported values by several orders of magnitude.
Abdul Khayum Mohammed and Dinesh Shetty
Royal Society of Chemistry (RSC)
Correction for ‘Macroscopic covalent organic framework architectures for water remediation’ by Abdul Khayum Mohammed et al., Environ. Sci.: Water Res. Technol., 2021, DOI: 10.1039/d1ew00408e.
Abdul Khayum Mohammed and Dinesh Shetty
Royal Society of Chemistry (RSC)
This article has critically reviewed the story of macroscopic developments of COFs for water remediation. The various macroscopic COFs for removing toxic organic and inorganic pollutants have been systematically surveyed.
Abdul Khayum Mohammed, Saurabh Usgaonkar, Fayis Kanheerampockil, Suvendu Karak, Arjun Halder, Minakshi Tharkar, Matthew Addicoat, Thalasseril G. Ajithkumar, and Rahul Banerjee
American Chemical Society (ACS)
The induction of macro and mesopores into two-dimensional porous covalent organic frameworks (COFs) could enhance the exposure of the intrinsic micropores toward the pollutant environment, thereby, improving the performance. However, the challenge is to build a continuous hierarchically porous macro-architecture of crystalline organic materials in the bulk scale. In this regard, we have strategized a novel synthetic method to create hierarchically porous COF foams consisting of ordered micropores (2-2.2 nm), disordered meso and macropores (50 nm to 200 µm) as well as ordered macropores (1.5 mm to 2 cm). Herein, graphene oxide was used for creating disordered macro and meso pores in COF-GO foams. Consider-ing the rheological features of the precursor hydrogel, we could integrate crystalline and porous COF-GO foams into self-supported 3D-printed objects with the desired shapes and sizes. Therefore, we have engineered the 3D macro-architecture of COF-GO foams into complex geometries keeping their structural order and continuous porosity intact over a range of more than a million (10-9 m to 10-3 m). The interconnected 3D openings in these COF-GO foams further enhance the rapid and efficient uptake of organic and inorganic pollutants from water (>95% removal within 30 s). The abundant distribution of interconnected macroporous volume (55%) throughout the COF-GO foam matrix enhances the flow of water (1.13 × 10-3 m.s-1) which results in efficient mass transport and adsorption.
Abdul Khayum Mohammed, Vidyanand Vijayakumar, Arjun Halder, Meena Ghosh, Matthew Addicoat, Umesh Bansode, Sreekumar Kurungot, and Rahul Banerjee
American Chemical Society (ACS)
The redox-active and porous structural backbone of covalent organic frameworks (COFs) can facilitate high-performance electrochemical energy storage devices. However, the utilities of such 2D-materials as supercapacitor electrodes in advanced self power-pack systems have been obstructed due to the poor electrical conductivity and subsequent indigent performance. Herein, we report an effective strategy to enhance the electrical conductivity of COF thin sheets through the in situ solid-state inclusion of carbon nanofiber (CNF) into the COF precursor matrix. The obtained COF-CNF hybrids possess a significant intermolecular •••interaction between COF and the graphene layers of the CNF. As a result, these COF-CNF hybrids (DqTp-CNF and DqDaTp-CNF) exhibit good electrical conductivity (0.25×10-3 Scm-1), as well as high performance in electrochemical energy storage (DqTp-CNF: 464 mFcm-2at 0.25 mAcm-2). Also, the fabricated, mechanically strong quasi-solid-state supercapacitor (DqDaTp-CNF SC) delivered an ultra-high device capacitance of 167 mFcm-2 at 0.5 mAcm-2. Furthermore, we integrated a monolithic photovoltaic self-charging power-pack by assembling DqDaTp-CNF SC with a perovskite solar cell. The fabricated self power-pack delivered excellent performance in the areal capacitance (42 mFcm-2) at 0.25 mAcm-2 after photo charging for 300 seconds.
Abdul Khayum M, Meena Ghosh, Vidyanand Vijayakumar, Arjun Halder, Maryam Nurhuda, Sushil Kumar, Matthew Addicoat, Sreekumar Kurungot, and Rahul Banerjee
Royal Society of Chemistry (RSC)
We have demonstrated a hydroquinone stitched β-ketoenamine COF acting as an efficient organic cathode in an aqueous rechargeable zinc ion battery.
Arjun Halder, Meena Ghosh, Abdul Khayum M, Saibal Bera, Matthew Addicoat, Himadri Sekhar Sasmal, Suvendu Karak, Sreekumar Kurungot, and Rahul Banerjee
American Chemical Society (ACS)
Covalent organic frameworks (COFs) have emerged as promising electrode materials in supercapacitors (SCs). However, their insoluble powder-like nature, poor capacitive performance in pristine form, integrated with inferior electrochemical stability is a primary concern for their long-term use in electrochemical devices. Keeping this in perspective, herein we report a redox active and hydrogen bonded COF with ultrahigh stability in conc. H2SO4 (18 M), conc. HCl (12 M) and NaOH (9 M). The as-synthesized COF fabricated as thin sheets were efficiently employed as a free-standing supercapacitor electrode material using 3 M aq. H2SO4 as an electrolyte. Moreover, the pristine COF sheet showcased outstanding areal capacitance 1600 mF cm-2 (gravimetric 169 F g-1) and excellent cyclic stability (>100 000) without compromising its capacitive performance or Coulombic efficiency. Moreover, as a proof-of-concept, a solid-state supercapacitor device was also assembled and subsequently tested.
Abdul Khayum M, Vidyanand Vijayakumar, Suvendu Karak, Sharath Kandambeth, Mohitosh Bhadra, Karthika Suresh, Nikhil Acharambath, Sreekumar Kurungot, and Rahul Banerjee
American Chemical Society (ACS)
Flexible supercapacitors in modern electronic equipment require light-weight electrodes, which have a high surface area, precisely integrated redox moieties, and mechanically strong flexible free-standing nature. However, the incorporation of the aforementioned properties into a single electrode remains a great task. Herein, we could overcome these challenges by a facile and scalable synthesis of the convergent covalent organic framework (COF) free-standing flexible thin sheets through solid-state molecular baking strategy. Here, redox-active anthraquinone (Dq) and π-electron-rich anthracene (Da) are judiciously selected as two different linkers in a β-ketoenamine-linked two-dimensional (2D) COF. As a result of precisely integrated anthraquinone moieties, COF thin sheet exhibits redox activity. Meanwhile, π-electron-rich anthracene linker assists to improve the mechanical property of the free-standing thin sheet through the enhancement of noncovalent interaction between crystallites. This binder-free strategy offers the togetherness of crystallinity and flexibility in 2D COF thin sheets. Also, the synthesized porous crystalline convergent COF thin sheets are benefited with crack-free uniform surface and light-weight nature. Further, to demonstrate the practical utility of the material as an electrode in energy-storage systems, we fabricated a solid-state symmetrical flexible COF supercapacitor device using a GRAFOIL peeled carbon tape as the current collector.
Arindam Mal, Rakesh K. Mishra, Vakayil K. Praveen, M. Abdul Khayum, Rahul Banerjee, and Ayyappanpillai Ajayaghosh
Wiley
AbstractIonic covalent organic nanosheets (iCONs), a member of the two‐dimensional (2D) nanomaterials family, offer a unique functional platform for a wide range of applications. Herein, we explore the potential of an ethidium bromide (EB)‐based covalent organic framework (EB‐TFP) that self‐exfoliates in water resulting in 2D ionic covalent organic nanosheets (EB‐TFP‐iCONs) for the selective detection of double‐stranded DNA (dsDNA). In an aqueous medium, the self‐exfoliated EB‐TFP‐iCONs reassemble in the presence of dsDNA resulting in hybrid EB‐TFP‐iCONs‐DNA crystalline nanosheets with enhanced fluorescence at 600 nm. Detailed steady‐state and time‐resolved emission studies revealed that the reassembly phenomenon was highly selective for dsDNA when compared to single‐stranded DNA (ssDNA), which allowed us to use the EB‐TFP‐iCONs as a 2D fluorescent platform for the label‐free detection of complementary DNA strands.
M. Abdul Khayum, Sharath Kandambeth, Shouvik Mitra, Sanoop B. Nair, Anuja Das, Samadhan S. Nagane, Rabibrata Mukherjee, and Rahul Banerjee
Wiley
AbstractCovalent organic nanosheets (CONs) are a new class of porous thin two‐dimensional (2D) nanostructures that can be easily designed and functionalized and could be useful for separation applications. Poor dispersion, layer restacking, and difficult postsynthetic modifications are the major hurdles that need to be overcome to fabricate scalable CON thin films. Herein, we present a unique approach for the chemical exfoliation of an anthracene‐based covalent organic framework (COF) to N‐hexylmaleimide‐functionalized CONs, to yield centimeter‐sized free‐standing thin films through layer‐by‐layer CON assembly at the air–water interface. The thin‐layer fabrication technique presented here is simple, scalable, and does not require any surfactants or stabilizing agents.
Shouvik Mitra, Sharath Kandambeth, Bishnu P. Biswal, Abdul Khayum M., Chandan K. Choudhury, Mihir Mehta, Gagandeep Kaur, Subhrashis Banerjee, Asmita Prabhune, Sandeep Verma,et al.
American Chemical Society (ACS)
Covalent organic nanosheets (CONs) have emerged as functional two-dimensional materials for versatile applications. Although π-π stacking between layers, hydrolytic instability, possible restacking prevents their exfoliation on to few thin layered CONs from crystalline porous polymers. We anticipated rational designing of a structure by intrinsic ionic linker could be the solution to produce self-exfoliated CONs without external stimuli. In an attempt to address this issue, we have synthesized three self-exfoliated guanidinium halide based ionic covalent organic nanosheets (iCONs) with antimicrobial property. Self-exfoliation phenomenon has been supported by molecular dynamics (MD) simulation as well. Intrinsic ionic guanidinium unit plays the pivotal role for both self-exfoliation and antibacterial property against both Gram-positive and Gram-negative bacteria. Using such iCONs, we have devised a mixed matrix membrane which could be useful for antimicrobial coatings with plausible medical benefits.