Tayyaba Najam

Shenzhen University · College of Chemistry and Environmental Engineering

Zn-based rechargeable energy devices showed more advantages, including safety, abundance, and high volumetric/gravimetric capacities. MXenes have been evaluated as valuable emerging 2D materials due to their thermal/chemical stabilities, conductivities, flexible mechanical properties, and unique topological features. However, the recent trends in M...

The enormous addition of CO2 is alarming for sustainability and efficient conversion of CO2 into valuable products is emerging technique for sustainable future. Photocatalytic reduction of CO2 by using solar energy is emergent not only for environmental concerns but also production of suitable chemicals and fuels. Metal-organic frameworks have been...

Modern computer-assisted synthesis offers solid support for easy virtual screening of easily synthesizable compounds. By using the synthetic accessibility score this restriction may be bypassed. In the present work, a chemical space of organic semi-conductors is generated. Synthetic accessibility of generated organic semiconductors is studied using...

Electrical conductivity is very important property of nanomaterials for using wide range of applications especially energy applications. Metal‐organic frameworks (MOFs) are notorious for their low electrical conductivity and less considered for usage in pristine forms. However, the advantages of high surface area, porosity and confined catalytic ac...

The fast growth of electrochemical energy storage (EES) systems necessitates using innovative, high-performance electrode materials. Among the various EES devices, rechargeable batteries (RBs) with potential features like high energy density and extensive lifetime are well suited to meet rapidly increasing energy demands. Layered transition metal d...

Symmetric pseudocapacitors (SPCs) have the ability to provide an extended operating life-span with high power density; however, their energy density is not sufficient for various critically vital applications. To reduce...

The hydrogen evolution reaction (HER) is a developing and promising technology to deliver clean energy using renewable sources. Presently, electrocatalytic water (H2O) splitting is one of the low-cost, affordable, and reliable industrial-scale effective hydrogen (H2) production methods. Nevertheless, the most active platinum (Pt) metal-based cataly...

The rapid depletion of fossil fuels and environmental pollution has motivated scientists to cultivate renewable and green energy sources. The hydrogen economy is an emerging replacement for fossil fuels, and photocatalytic water splitting is a suitable strategy to produce clean hydrogen fuel. Herein, the photocatalyst (PdO.TiO2) is introduced as an...

Covalent organic frameworks (COFs), owing to their greater surface area, tuneable pore structure, functionality, and unique molecular architecture, have gained tremendous interest for various applications including; catalysis, electrocatalysis, gas sensing, sensor, adsorption, etc. Further, the high structural extent and the atomic-level distributi...

One of the most exciting new developments in energy storage technology is Zn‐ion hybrid supercapacitors (ZHSCs). ZHSCs combine Zn‐ion batteries with supercapacitors (SCs) to address the energy and power needs of portable devices and electric automobiles. Low energy density and the development of cathode material are significant issues for ZHSCs. Th...

Abstract One of the most exciting new developments in energy storage technology is flexible Zn‐ion hybrid supercapacitors (f‐ZIHSCs), which combine the high energy of Zn‐ion batteries with high‐power supercapacitors to satisfy the needs of portable flexible electronics. However, the development of f‐ZHSCs is still in its infancy, and there are nume...

The electrochemical reduction of CO2 into fine chemicals, assisted with renewable energy, is the most instant approach for balancing the atmospheric CO2 level, as well as for storing solar energy as chemical energy. Due to their easy synthesis and good performance, metal oxides are attractive as electrocatalysts for the CO2 reduction reaction (CO2R...

Elimination of toxic dyes, as one of the utmost usual industrial pollution released in the natural water, is the very serious issue for the modern civilization. In this study a novel bimetallic [email protected] zeolitic imidazolate frameworks (ZIFs) have been fabricated by a simple and straight forward room temperature technique. Sodalite (SOD) ca...

In this research work, tri-metallic layered double hydroxides (NiZnAl-LDH) nano-sheets were efficiently synthesized by hydrothermal technique and applied for the decontamination of rhodamine B (Rh-B) and methyl orange (MO). Material characterizations confirm the formation of tri-metallic NiZnAl-LDH nano-sheets of continuous macrostructure skeleton...

Nanocrystalline M type hexaferrites Ca0.5Pb0.5-xYbxZnyFe12-yO19 (x = 0.00-0.1, y = 0.00, 1.00) were synthesized by sol-gel autocombustion method. The effects of Yb-Zn doping on structural, optical and electric nature of Ca-Pb M type hexaferrites were explored. The crystal structure of the hexaferrites revealed magnetoplumbite phase with Yb-Zn varyi...

Aqueous hybrid supercapacitors (AHSCs) exhibit promising electrochemical performance with long cyclic sta- bility and high power density. However, the low-energy density restricted their development to commerciali- zation. To improve the energy density, we proposed a heterostructured (HS) composite of nickel–cobalt–sulfide (NCS) nanoflowers embedde...

Metallic nanoparticles (M-NPs) have gained increasing intention in catalytic environmental remediation owing to their distinctive chemical and physical properties. However, their aggregation during catalysis and difficult recovery after completion of reaction are the major issues related to their practical applications. It is well recognized that t...

Aqueous hybrid supercapacitors (AHSCs) exhibit promising electrochemical performance with long cyclic stability and high power density. However, the low-energy density restricted their development to commercialization. To improve the energy density, we proposed a heterostructure (HS) composite of nickel–cobalt–sulfide (NCS) nanoflowers embedded in...

The electronic structure of catalytic active sites can be influenced by modulating the coordination bonding of the central single metal atom, but it is difficult to achieve. Herein, we reported the single Zn-atom incorporated dual doped P, N carbon framework (Zn-N4P/C) for ORR via engineering the surrounding coordination environment of active cente...

MXenes, with general formula Mn+1XnTx, (where n = 1–4; M = early transition metals; X = C, N, or a combination of both; Tx = surface functional groups like –OH, -O, -F, or -Cl) are a diverse group of two-dimensional (2D) layered transition metal carbides, nitrides and carbonitrides. Due to the energy and environmental problems, the renewable energy...

The ever increasing concentration of toxic and carcinogenic hexavalent chromium (Cr (VI)) in various environmental mediums including water-bodies due to anthropogenic activities with rapid civilization and industrialization have become the major issue throughout the globe during last few decades. Therefore, developing new strategies for the treatme...

Single-atom catalysts have emerged as effective active species for electrocatalysis because of their appropriate structural and electronic properties. However, the weight percentage of single metal atoms are generally below 5wt% in the catalysts, limiting the population of catalytic sites and their performance. In this work, we synthesized Zn singl...

Recent progress in synthetic strategies, analysis techniques, and computational modeling assist researchers to develop more active catalysts including metallic clusters to single‐atom active sites (SACs). Metal coordinated N‐doped carbons (M‐N‐C) are the most auspicious, with a large number of atomic sites, markedly performing for a series of elect...

In this presentation We explained and purified the Brackish water samples Using ZIF-8 and ZIF-67 MOFs. After results we concluded that these MOFs are excellent adsorbents for purification of Brackish Water.

The increasing demands of energy and environmental concerns have motivated researchers to cultivate renewable energy resources for replacing conventional fossil fuels. The modern energy conversion and storage devices required high efficient and stable electrocatalysts to fulfil the market demands. In previous years, we are witness for considerable...

The use of highly efficient, environment-friendly and economically inexpensive materials for the adsorption removal of contaminants from water has always been considered as emerging task. In this study, we synthesized hybrid tri-metallic nickel cobalt layered double hydroxide (NiCoAl-LDH) porous material for the adsorption removal of Eosin yellow (...

Catalytic conversion of toxic compounds into applied products is an emerging area of interest especially for the industrial as well as academic researchers. The development of catalysts for efficient conversion of carbon dioxide and carbon monoxide is highly desired for green world. Metal Organic Frameworks (MOFs) being porous and highly functional...

Based on the theoretical gravimetric energy density of lithium-sulfur batteries (LiSBs) (2600 Wh kg− 1) and natural abundance and economic affordability of elemental sulfur, the all-solid-state lithium-sulfur batteries (SS-LiSBs) have a tremendous potential to assure powering from portable electronic devices to the heavy electric vehicles. Neverthe...

The rapid development of flexible and wearable optoelectronic devices, demanding the superior, reliable, and ultra-long cycling energy storage systems. But poor performances of electrode materials used in energy devices are main obstacles. Recently, single-atom catalysts (SACs) are considered as emerging and potential candidates as electrode materi...

Currently, low‐carbon economy is getting importance and electrochemical energy conversion and storage technologies can play an important role in this development. Fuel cells and metal–air batteries are considered as emerging and potential alternate to conventional combustion engines. However, there are real problems that need to be faced, such as t...

The worldwide emission of greenhouse gases combined with the lessening of crude oils is passionate about the research on sustainable energy conversion and storage devices. Further, the fast evolution of flexible and wearable opto-electronic systems, superior reliability, and ultra-long cycling lives of energy storage devices are of great importance...

We summarize the latest progress achieved in precious and non-precious carbon based single-atom catalytic active sites, including Pd, Pt, Ir, Ru, Rh, Au, Fe, Co, Mn, Zn, Sn, and Cu, aiming at facilitating metal-air/O2 batteries, water electrolyzers, and fuel-cells commercialization. Correspondingly, several aspects of the intrinsic catalytic activi...

MOF-derived catalysts show excellent performance in many electrochemical reactions, including alkaline water splitting. This manuscript describes synthesis of composite mixture by engineering the N-doped carbon (NC) layer on the surface of FeCo-doped MOF at nanoscale level via sonication, and pyrolysis process produced metal-coordinated N-doped car...

Water, being a universal solvent, is contaminated by highly toxic pollutants, which is alarming for life on this planet. However, eco-friendly human efforts are constantly trying to overcome this problem. In continuation of these efforts, the present study reported the synthesis of template-supported nanoadsorbents consisting of mesoporous organosi...

Heteroatom doping is considered an efficient strategy when tuning the electronic and structural modulation of catalysts to achieve improved performance towards renewable energy applications. Herein, we synthesized a series of carbon-based hierarchical nanostructures through the controlled pyrolysis of Co-MOF (metal organic framework) precursors fol...

Heteroatom-doping introduces various defects in nanocarbons, herein; we reported salt-assisted synthetic strategy by establishing gas-liquid interface during pyrolysis and explored fluorine enrichment effect on mesoporous N-doped nanocarbons. The F, N co-doped carbon (FNC) performs similar to precious electrocatalysts in terms of onset (0.98 V) and...

The development of smart structured cathode materials for supercapacitors (SCs) has sparked tremendous interest. However, the appropriate design to achieve high capacitance and energy density-based cathode materials remains a major problem for energy storage systems. This article describes the effective synthesis of self-supported 3D micro-flowers...

Metal sulfides delivered much better electrochemical performance over metal oxides due to the extended potential window with high conductivity and therefore are much investigated in the field of energy storage applications. Herein, binder-free two-dimensional bimetallic (ZnS/FeS) interconnected composite nanosheet arrays are synthesized on carbon c...

Developing efficient materials is urgent to reach the challenging demand of next-generation energy devices from portable electronic devices to electric grids and electric vehicles. Nanostructure interface engineering is an emerging strategy to prepare advanced materials according to demand. Herein, we reported the surface induced metal organic fram...

The increasing concentration of CO2 is alarming for modern society and the reduction of CO2 into valuable products is the unique solution. Metal-organic frameworks (MOFs), constructed by organic linkers interconnected with metal (oxide) nodes, with high porosity and large surface area, have become an emerging class of electrocatalysts for reduction...

High energy-density supercapacitors (SCs) with long operating life, cost-effective, and competitive cycling performance is attracted great research attention to competing in the requirements of the modern age. However, despite these benefits, SC hampers inadequate rate-capability and structural deterioration, which primarily affects its commerciali...

Herein, we report borophene decorated with Ag nanoparticles ([email protected]) as a support, which shows greatly enhanced oxygen-evolution-reaction (OER) performance for Co3O4 catalysts. The excellent OER performance of Co3O4[email protected] is attributed into two main reasons. First, the conductive Ag-nanoparticles on borophene facilitate the gr...

A binder-free composite composed of two-dimensional (2D) vanadium oxysulfide nano-spindles (VoS-NS) directly grown on carbon textile (CT) substrate ([email protected]) is prepared as a novel electrode for high-performance pseudocapacitors (PCs). Benefiting from the merits of highly exposed active sites and enhanced electrical conductivity, optimize...

Tin chalcogenides are considered as promising anode materials for lithium-ion batteries (LIBs) due to their high theoretical lithium-storage capacity. Herein, we have successfully synthesized the composites of tin chalcogenides and graphite, that is, SnS/C, SnSe/C, and SnS0.5Se0.5/C, via a simple one-pot solid-state method. During the electrochemic...

Herein, we successfully synthesized two novel metal thiophosphites (MTPs) hybridized with carbon, that is, NiPS3/C and SnPS3/C composites, via an environment-friendly and cost-effective approach without harsh reaction conditions. Subsequently, the electrochemical performances of NiPS3/C and SnPS3/C composites have been investigated in coin-cells, a...

Zeolitic imidazole frameworks (ZIFs) and their derivatives, being an emergent category of adsorbents, are anticipated to adsorb organic dyes from aqueous mediums. Herein, ZIF-67 and Ni-doped ZIF-67 were designated due to their high stability in aqueous mediums, porosity and straightforward synthesis. Porous Ni-doped ZIF-67 nanocomposite was produce...

Metal-organic frameworks (MOFs) are newly introduced category of porous compounds reflected as proficient and economic to exclude organic dyes from water. In the present work, a metal doping strategy in MOFs has been introduced to enhance the efficiency of porous MOFs for adsorption of environmentally detrimental rhodamine B (Rh-B). The porous ZIF-...

Single atoms loaded on two-dimensional materials ([email protected]) have been broadly explored recently in the field of catalysis. Compared with conventional supports, 2D materials with large surface areas, unique geometric structure, and electronic properties can boost the catalytic performances of anchored single noble atoms (SNAs). Meanwhile, t...

Two-dimensional (2D) nanoflakes of vanadium pentoxide (V2O5) are directly developed on the titanium (Ti) substrate ([email protected]) as an innovative electrode for pseudocapacitor. The designed [email protected] electrode offers impressive capacitance of 1520 Fg⁻¹ at 1.5 Ag⁻¹ and superb long-term reliability with a 99% retention over 12000 cycles...

The electrocatalyzed oxygen and hydrogen evolution reactions (OER/HER) are the key constituents of water splitting toward hydrogen production over electrolysis. The development of stable non-noble nanomaterials as bifunctional OER/HER electrocatalysts is the foremost bottleneck to commercial applications. Herein, the fabrication of Te-modulated FeN...

It's still an ongoing research challenge to explore non-precious metal-based catalysts for substituting precious metal catalysts during full water electrocatalysis. Herein, we reported the partially oxidized cobalt species in nitrogen-doped carbon nanotubes hierarchical structures to produce dual-functionality towards oxygen/hydrogen evolution reac...

The current research focus is to develop some systematic materials for the removal of hazardous dyes from water to save the aquatic environment. We have reported the in-situ growth of zeolitic imidazolate frameworks (ZIF-8) on zinc layered double hydroxide (ZnAl-LDH) and the developed porous composite material ([email protected]) for adsorptive eli...

Water resources are badly affected by industrial effluents containing organic azo dyes. The present study successfully synthesized silver (Ag) and zinc oxide (ZnO) supported periodic mesoporous organosilicates (Ag-PMOS and ZnO-PMOS) for catalytic degradation of methylene blue (MB) and methyl orange (MO). Initially, methyacryl functionalized periodi...

This study presents a comparison among different-bottled drinking water commercially available in Lahore Pakistan. For that, five locally produced drinking water brands and four national brands were selected. Different physical, chemical and microbiological parameters like EC, pH, salinity, TDS, Na⁺, K⁺, Ca²⁺, Mg²⁺, Cl⁻, F⁻, Fe3+, SO4 ²⁻, NO3-, PO4...

To maintain ecosystem balance and secure a more sustainable future, it is imperative that we find a quick and economical method for the efficient remediation of pollutants from the environment. As a class of recently developed versatile porous materials, metal–organic frameworks (MOFs) have gained attention as promising materials for the removal of...

Although cobalt/zinc-based bimetallic oxides are regarded as auspicious pseudocapacitive electrode materials owing to their high specific-capacitance and rich electrochemistry; however, relatively large capacitance fading during charge/discharge process and low energy-density hinder their real applications. In this work, we rationally designed a bi...

Synthesis of porous materials is very attractive due to their various applications in era of water purification. The other advantage is due the structural and functionality of stable MOFs-based porous materials. Metal-organic frameworks (MOFs) are spongy like structures that are composed of transition metals coordinately linked or protected via lig...

In this paper, the facile synthesis of graphene oxide and MOF based composite material for the demanded adsorption of leading antibiotic is reported. The adsorbent showed good results for removal of norfloxacin with high adsorption capacity (1114.82 mg/g) and removal efficiency (93.61 %). In addition, Langmuir model proved most suitable with highes...

Highly flexible pseudocapacitors (PCs) have great potential in modern electronics such as portable and wearable devices. However, they are not yet mature enough to reach the market due to low energy density. In this study, for the first time, we are reporting an efficient synergetic approach by optimizing the feeding ratio of cobalt:gallium (Co:Ga)...

It is imperative to develop new and efficient electrode materials intended for electrochemical energy storage to accomplish increasing energy demand. Ternary cobalt-nickel-sulfides have gained more attention for energy storage owing to their superior redox chemistry and higher electronic conductivity as electrode materials. Herein, distinctive flow...

The increase in worldwide ultimatum for renewable energy combined with lessening of crude oils and unfavorable ecological impression ensures encouraged and passionate research on sustainable energy conversion and storage devices. With the rapid development of flexible and wearable optoelectronic devices, superior reliability and ultra-long cycling...

Industrial waste water containing organic pollutants is a universal issue due to its hazardous chemical nature. Fabrication of hybrid mixed-matrix is a typical and powerful approach to create new functionalities that cannot be represented by single-phase materials. In present study, we have reported the in-situ growth of zeolite imidazolate framewo...

To substitute precious metal with non-precious electrocatalysts, that can work efficiently, still remains a great challenge. Herein, we fabricated the series of nitrogen doped carbon (NC) and CoFe-NC core-shell architectures to produce dual-functionality towards oxygen reduction/evolution reactions and ultimately for Zn-air battery. The addition of...

Water as a universal solvent has well-documented for its ability to dissolve various substances leading to water pollution. Metal organic frameworks (MOFs) have been proved to have interesting properties for the adsorptive removal of pollutants from water. In this work, Mn-PBA (Mn[Fe(CN)6]) and Mn-PBA/GO composite have been developed using simple a...

The trace amount of poisoning species in air, such as SOx and NOx, greatly degrade the performance of zinc-air battery, as they block the active sites of conventional metal containing electrocatalysts. To overcome this challenge, a catalyst with enhanced electrocatalytic properties and good resistance towards the small molecular poisons should be p...

Engineering the morphology of integral building blocks is a key step in broadening their catalytic activities. In this work, an interesting structure is reported by oriented and directed growth of manganese oxide (Mn3O4) quasi-nanocubes on nitrogen doped mesoporous carbon polyhedrons resulting from zeolite imidazole framework (ZIF-8). The prepared...

We report that trace level of metal impurities on the surface of Ir alloy nanocrystals show a great impact on the electrocatalytic activity for the hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER). The HOR/HER activities were found to be predominantly related to OH adsorption that is related to the surface impurity content. F...

This review summarizes the current advances of hetero-doped (Fe, Co, P, S, N) nanostructures derived from MOFs (metal-organic frameworks) for the oxygen reduction reaction (ORR) electrocatalysis. These nanomaterials are classified as: 0D (polyhedrons, hollow and core-shell structures), 1D (nanotubes and nanorods), 2D (nanosheets), and 3D (honeycomb...

Metal-Organic Framework Based Catalysts: Nano-engineering enhanced the Electrocatalytic Performance Dr. Syed Shoaib Ahmad Shah1,2, Dr. Tayyaba Najam2,3, Dr. Ejaz Hussain2, Prof. Dr. Muhammad Ashfaq2, Prof. Dr. Shuqin Song1 1 The Key Lab of Low –carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineerin...

Developing efficient electrocatalysts is extremely desirable to decrease the overall cost of electrochemical devices. It usually lies in interface modification for improving intrinsic activity of active sites, and structural optimization for facilitating mass transport. Herein, we rationally design a series of carbon-based hierarchical architecture...

Metal nanoparticles (NPs) encapsulated into nitrogen-doped carbon are proved to be an efficient way to enhance the catalytic activity, but the mechanism behind is still debatable. Here, we prepared metal-nitrogen doped carbon shield (Me-NC) NiFe nanoparticles (NiFe-NC/Me-NC) by simple template nanocasting, and then selectively removed metal species...