Multi-walled Carbon Nanotube Composites Research Articles

Determination of Organophosphate Esters in Water Samples Using Gas Chromatography– Mass Spectrometry (GC–MS) and Magnetic Solid-Phase Extraction (SPE) Based on Multi-Walled Carbon Nanotubes (MWCNTs)

A method based on gas chromatography–mass spectrometry (GC–MS), coupled with magnetic solid-phase extraction (SPE) with multi-walled carbon-nanotube (MWCNT)-coated iron oxide (Fe3O4) as the adsorbent, was developed for analyzing four organophosphate esters in ambient water samples. The magnetic, MWCNT composites were prepared by hydrothermal synthesis and characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, and superconducting quantum interference device magnetometry (SQUID). The extraction and desorption conditions, such as adsorbent dosage, adsorption time, eluent type, and eluent volume, were studied. The adsorbent was used to extract analytes within 50 min. The limit of detection (LOD) was between 0.038–1 μg/L, and the limit of quantitation (LOQ) was between 0.10–3.59 μg/L. The method was applied to analyze organophosphate esters in environmental water samples. A 72.5–89.1% recovery was obtained by analyzing spiked samples with low-, medium-, and high-concentration analytes. The relative standard deviations (RSDs) were less than 10%. This method displayed better sensitivity and accuracy; therefore, it could be successfully used to detect organophosphate esters in environmental water samples.

Amorphous and Crystalline Vanadium Orthophosphate and Oxidized Multiwalled Carbon Nanotube Composites as Anode Materials in Sodium‐Ion Batteries

AbstractVanadium orthophosphate and oxidized multiwalled carbon nanotube (ox‐MWCNT) composites were applied as anodic electroactive materials in a sodium‐ion battery. Carbon nanotubes reduce the resistance of anodic materials, prevent drastic volume expansion, and allow easy transport of electrolyte ions, leading to an improvement in the electrochemical performance of electroactive materials. Theoretical modeling of the VPO4 /ox‐CNT interphase indicates the conducting properties of the crystalline c‐VPO4 /ox‐MWCNT composite and the significant contribution of CNTs in the charge transfer process. As anodes in sodium‐ion batteries, crystalline VPO4 (c‐VPO4 ) and amorphous VPO4 (a‐VPO4 ) exhibited initial discharge capacities of 125 mAh g−1 and 110 mAh g−1, respectively. The incorporation of vanadium phosphate into the network of ox‐MWCNTs results in a large increase in the capacity performance of electroactive materials. Discharge capacities of 1642 mAh g−1 and 1680 mAh g−1 were obtained for the first cycle in the case of the c‐VPO4 /ox‐MWCNT 50 % w/w and a‐VPO4/ox‐MWCNT 50 % w/w anodes, respectively. The capacity of these composite materials significantly decreases in the second cycle, reaching a stable capacity performance. The limiting capacity was 328 mAh g−1 for composites containing 50 % w/w ox‐MWCNTs.

Efficient catalytic oxidation of benzyl alcohol by tetrasubstituted cobalt phthalocyanine-MWCNTs composites

In this paper, the tetra-[α-(p-formyl) phenoxy] phthalocyanine cobalt (II)/multiwalled carbon nanotubes (CoPc/MWCNTs) composites were prepared through the π-π interactions between CoPc and MWCNTs. UV–vis spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy were employed to characterize the structures of the prepared CoPc/MWCNTs composites. Its catalyzed oxidation properties were studied by carrying out the oxidation reaction of benzyl alcohol. The catalytic efficiency of these compounds under different reaction parameters such as catalyst dosage, temperature, time and various organic solvent was investigated.

Synergistically enhanced performance of epoxy resin by block copolymer and multi‐walled carbon nanotubes

AbstractThis work aims to investigate the performance of the epoxy resin modified by poly(ethylene glycol)‐b‐poly(propylene glycol)‐b‐poly(ethylene glycol) (PEO‐PPO‐PEO) block copolymers and multi‐walled carbon nanotubes (MWCNTs). It is detected that when PEO‐PPO‐PEO block copolymers and MWCNTs are simultaneously added, synergistic toughening effects for epoxy resin achieve without loss of other properties. Specifically, with the introduction of 5 wt% PEO‐PPO‐PEO block copolymers, the critical stress intensity factor (KIc) of the epoxy resin is increased by 65.7% in contrast with the pure epoxy resin by the reason of the epoxy matrix shear yielding triggered by cavitation of PEO‐PPO‐PEO nanophases and by 28.7% with the introduction of 0.25 wt% MWCNTs owing to the pull‐out and crack bridging of MWCNTs, but other properties are decreased. However, with the simultaneous introduction of 5 wt% PEO‐PPO‐PEO and 0.25 wt% MWCNTs, the KIc of epoxy resins is significantly increased by 97.3%, exhibiting much higher than the linear superposition of the corresponding epoxy resin/PEO‐PPO‐PEO and epoxy resin/MWCNTs composites. Meanwhile, the decrease in other properties is retarded. This is because PEO‐PPO‐PEO block copolymer can enhance the interactions between MWCNTs and epoxy resins in the epoxy resin/PEO‐PPO‐PEO/MWCNT composites, thereby promoting the dispersion of MWCNTs in the epoxy resins. Consequently, the fracture toughness of epoxy resins is efficiently boosted by the superposition of the pull‐out and crack bridging of well‐dispersed MWCNTs and the epoxy matrix shear yielding triggered by the strengthened interactions between PEO‐PPO‐PEO block copolymers and MWCNTs. This work supplies an easy and efficient means to solve the dispersion of nanoparticles, which can prominently advance the comprehensive properties of epoxy resins.

Preparation of the hexachlorocyclotriphosphazene crosslinked sodium alginate polymer/multi-walled carbon nanotubes composite powder for the removal of the cationic dyes

The hexachlorocyclotriphosphazene crosslinked sodium alginate polymer (HCSAP)/multi-walled carbon nanotubes (MWCNTs) composite was synthesized by a facile one-pot reaction for the purpose of removing the cationic dyes. The structure of the resultant HCSAP/MWCNTs composite was investigated by the scanning electron microscope, the thermal gravimetric analyzer, the Fourier transform infrared spectroscope, the X-ray photoelectron spectroscopy, and the zeta potential measurement. Furthermore, the dye adsorption behaviors of the HCSAP/MWCNTs composite were explored using the methylene blue (MB) and the crystal violet (CV) as the cationic dye pollutant models. The maximum adsorption capacities of MWCNTs-COOH/PCSAP composite for the MB and the CV reached as high as 662.3 mg/g and 666.7 mg/g, respectively. This good absorption ability could be mainly ascribed to the electrostatic attraction. The effects of the MWCNTs content, the initial dye concentration, and the initial pH value of the dye solution on the dye adsorption capacity, the adsorption kinetic, the adsorption isotherm, the adsorption thermodynamic, and the adsorption-desorption cycle regeneration were also studied for the MWCNTs-COOH/PCSAP composite in this work.

Tuning surface composition of multiwalled carbon nanotubes supported Pt-Co bimetallic nanoparticles for boosting methanol oxidation catalysis

Developing catalysts with high performance and low cost for methanol oxidation reaction (MOR) is the key to promoting the industrialization of direct methanol fuel cells (DMFCs). In this work, multiwalled carbon nanotubes (MWCNTs) supported PtCo alloys catalysts with improved MOR properties and anti-CO poisoning ability are successfully prepared by integrating low temperature adsorption and high temperature reduction method. The Pt1Co3@NC/MWCNTs sample with moderate Co2+ feeding content (0.81 mA/ugPt) achieves a factor of 1.93 enhancement in MOR mass activity compared to the commercial Pt/C catalyst (0.42 mA/ugPt). In addition, the Pt1Co3@NC/MWCNTs sample displays a lower CO oxidation onset potential respect to pristine Pt/C catalyst (0.74 V vs. 0.82 V). Scuh improvement of MOR activity, durability and anti-CO poisoning ability of the Pt1Co3@NC/MWCNTs catalyst is ascribed to the moderate surface compositions, optimal electronic interaction between PtCo alloys and MWCNTs, and the protection of N-doped carbon (NC) shells. This study provides a new direction to decrease the utilization of platinum and improve the MOR activity, stability and anti-CO poisoning ability of electrocatalysts which will be potential in design and fabrication of the highly efficient electrocatalysts for DMFCs applications.

Porous Spinel Magnesium Manganese Oxide/Multiwalled Carbon Nanotubes Composite Synthesized by Electrochemical Conversion as High-Performance Cathode for Aqueous Magnesium Ion Battery

Aqueous magnesium ion batteries (AMIBs) have attracted great interest due to the low manufacture cost and eco-friendliness, but the lack of suitable cathodes with good electrochemical performance obstructs their development. Here, a composite of spinel magnesium manganese oxide (MgMn2O4) and multiwalled carbon nanotubes (MWCNTs) with a porous structure is synthesized by electrochemical conversion method and used as the cathode for the AMIB, which improves the inherent low conductivity for MgMn2O4 and enhanced its specific capacity. The electrochemical conversion method helps preserve the surface integrity and structure stability of the electrode, and the MWCNTs network provides the pathway of Mg ion migration among the MgMn2O4 particles. The obtained MgMn2O4/MWCNTs displays a discharge capacity of 322.3 mAh g−1 at 50 mA g−1, and the capacity retention is 81.8% after 2000 iterations at 1000 mA g−1. Further, the MgMn2O4/MWCNTs//VO2 system is assembled, which displays a capacity retention rate of near 100%. The electrochemical mechanism of Mg ion insertion/extraction is investigated though the ex situ X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements. This paper extends synthesis method of the high performance cathode material for AIMB system.

Preparation Methods and Performance Analysis of Polyanthra-Quinone/Carbon Nanotube Composites for Capturing Carbon Dioxide

Carbon capture is one of the important methods to achieve carbon neutrality. In this paper, a simple and reliable method for the preparation of poly(anthraquinone)/multi-walled carbon nanotube composites (PAQ/MWCNTs) for capturing carbon dioxide is proposed. Using constant magnetic stirring, 1,4-anthraquinone (1,4-AQ) was allowed to accumulate on multi-walled carbon nanotube (MWCNTs) substrates via π–π. The poly(anthraquinone)/multi-walled carbon nanotube composites were produced by this continuous process. Besides, the carbon cloth electrode prepared from PAQ/MWCNTs composites was subjected to redox potentials for carbon dioxide capture. Results showed that PAQ/MWCNTs composites had good redox reversibility, their carbon dioxide capture capacity was 7.80 mmol·g−1 while the material utilization rate reaches reached 73.4%.

Ultrahigh thermopower waves in carbon nanotube‐antimony telluride composites enabled by thermal decomposition of formaldehyde

Scattered energy sources are essential to advance sustainable systems with the development of small-sized devices. Thermopower waves (TWs), which use self-propagating combustion along micro-nanostructured composites, can directly convert thermochemical to electrical energy, thereby resolving the configuration limits in small dimensions. However, poor sustainability and energy density, induced by short duration of the combustion should be addressed, although TWs exhibit high-power densities. Herein, we report the use of formaldehyde (FA)-activated multi-walled carbon nanotube (MWCNT) and Sb2Te3 composites to achieve ultrahigh TWs enabled by the remarkable enhancement of the sustained time and the chemical energy conversion. The FA supports sustained and amplified TWs through its chemical reaction pathways, while the MWCNTs and Sb2Te3 serves as thermal conduits and thermoelectric materials to generate TWs. The weight ratio of MWCNT and Sb2Te3 was optimized to produce a high-power density (~1.1 mW/cm2), and the optimal amount of FA to the tuned MWCNT:Sb2Te3 ratio resulted in a significantly sustained time (~68.55 seconds, 2698% enhancement compared to without FA). The pre-decomposed carbon oxides and carbonate from the FA chemical reaction considerably delay self-propagating reaction and promoted the evaporation of the Te species in Sb2Te3 and its oxidation to Sb2O3 and Sb2O5, which could produce additional energy generation (~0.29 mJ/cm2). A theoretical analysis elucidated the individual contributions of the Seebeck and chemical energy, and rational strategies to enhance the TWs. This work can pave the way for the development of advanced TW devices that satisfy the demands for both high energy density as well as long-term power generation.

Sulfonated Poly(arylene ether nitrile)-Based Composite Membranes Enhanced with Ca2+ Bridged Carbon Nanotube-Graphene Oxide Networks

As the core component of proton exchange membrane fuel cells, proton exchange membranes (PEM) have attracted much attention of researchers. To trade-off the proton conductivity, dimensional stability and anti-oxidation ability of PEM, graphene oxide (GO) and acidized multi-walled carbon nanotubes (MWCNT) using calcium ion as coordination bridge (GO-Ca2+-MWCNT) was synthesized, and then incorporated into sulfonated poly(arylene ether nitrile) (SPEN) to fabricate SPEN/GO-Ca2+-MWCNT organic–inorganic composite membranes by solution-casting method and explore the influence of varying loading on performances as PEM. It was found that the proton conductivity of the composite membranes was higher than that of SPEN, while maintaining better dimensional stability, excellent anti-oxidation ability and good mechanical properties. All of these were attributed to the formation of three-dimensional structure between GO and MWCNT bridged by Ca2+ and the interaction between the sulfonic acid group and calcium ions in SPEN/GO-Ca2+-MWCNT composites. Particularly, the SPEN/GO-Ca2+-MWCNT-1 composite membrane exhibited excellent tensile strength of 71.45 MPa, better thermal stability as well as high proton conductivity (0.054 S/cm at 30 °C, and 0.193 S/cm at 90 °C), above 10–2 S/cm, satisfying the requirement of PEM. All in all, the results indicate that the filler with three-dimensional network structure can effectively improve the performances of SPEN, and the prepared composite membranes show potential applications in many fields.

Application of experimental design methodology to optimize acetaminophen removal from aqueous environment by magnetic chitosan@multi-walled carbon nanotube composite: Isotherm, kinetic, and regeneration studies

Acetaminophen is a widely used drug worldwide and is frequently detected in water and wastewater as a high-priority trace pollutant. This study investigated the applicability of the adsorption processes using a composite of magnetic chitosan and multi-walled carbon nanotubes (MCS@MWCNTs) as an adsorbent in the treatment of acetaminophen. The model was well fitted to the actual data, and the correlation coefficients of R2 and adjusted R2 were 0.9270 and 0.8885, respectively. The maximum ACT removal efficiency of 98.1% was achieved at ACT concentration of 45 mg L-1, pH of 6.5, MCS@MWCNTs dosage of 400 mg L-1, and the reaction time of 23 min. The result shows that BET specific surface area of 640 m2 g-1. The adsorption isotherms were well fitted with the Langmuir Model (R2 =0.9961), depicting the formation of monolayer adsorbate onto the surface of MCS@MWCNTs. The maximum monolayer adsorption capacity of 256.4 mg g-1 was observed for MCS@MWCNTs. The pseudo-second-order kinetic model well depicted the kinetics of ACT adsorption on MCS@MWCNTs (R2=0.9972). Desorption studies showed that the desorption process is favored at high pH under Alkaline conditions. The results demonstrate that the MCS@MWCNTs is an efficient, durable, and sustainable adsorbent in water purification treatment.

Temperature-Dependent Fractional Dynamics in Pseudo-Capacitors with Carbon Nanotube Array/Polyaniline Electrodes.

Pseudo-capacitors with electrodes based on polyaniline and vertically aligned multiwalled carbon nanotubes (PANI/VA-MWCNT) composite are studied. Fractional differential models of supercapacitors are briefly discussed. The appropriate fractional circuit model for PANI/MWCNT pseudo-capacitors is found to be a linearized version of the recently proposed phase-field diffusion model based on the fractional Cahn–Hilliard equation. The temperature dependencies of the model parameters are determined by means of impedance spectroscopy. The fractional-order is weakly sensitive to temperature, and the fractional dynamic behavior is related to the pore morphology rather than to thermally activated ion-hopping in PANI/MWCNT composite.

Strongly Coupled Tin(IV) Sulfide–MultiWalled Carbon Nanotube Hybrid Composites and Their Enhanced Thermoelectric Properties

Herein, tin(IV) sulfide (SnS2) and multiwalled carbon nanotube (MWCNT) composites are fabricated via a simple solution-mixing method in a hydrothermal reactor. SnS2 is closely coupled to the MWCNT surface, thus forming a coaxial nanostructure. Examination by X-ray photoelectron spectroscopy and scanning transmission electron microscopy indicates that the strong interface between SnS2 and the MWCNTs in the composite material is due to the formation of Sn-O and Sn-S bonds. In addition, an examination of the temperature-dependent thermoelectric (TE) properties demonstrates that the SnS2-MWCNT hybrid composite with 3 wt % MWCNTs exhibits the maximum power factor of ∼91.34 μW/(m·K2) at 500 K, which is ∼50 times larger than that of the pristine SnS2. These results highlight the fabrication and enhanced TE properties of hybrid composites via the coupling of SnS2 and MWCNTs.

A composite nanofiller with a nail column void structure to imitate beetle shell fiber to enhance the impact resistance of polyurethane elastomer

Polyurethane elastomer (PUE) is faced with cracking problems under the high-speed impact to limit its application in the protective field. Inspired by a “nail columns"—"nail columns” void structure of chitin fiber on the beetle shell, tetra vinyl polyhedral oligomeric silsesquioxanes (EVPOSS) composite multiwalled carbon nanotube (MCNTs) enhanced fillers (PDVBMC and PNHMC) were prepared by different bonding types and used to improve the impact resistance of PUE. The 1.5 wt% PDVBMC or PNHMC reinforced composite PUE exhibited simultaneous enhancements in maximum compression modulus (22.2% and 34.6%), energy absorption (40.1% and 53.7%) and storage modulus (16.5% and 30.6%). The excellent mechanical properties of composite PUE is not only attributed to the enhancement of interface strength between enhanced fillers and PUE matrix but also the bonding strength between enhanced fillers, which can be demonstrated by the differences in energy absorption, storage modulus and bonding fracture energy.

Enhanced thermoelectric performance of CuAlS2 by adding multi-walled carbon nanotubes

In this paper, we report the first-ever study on a relatively uniform dispersion of multi-walled carbon nanotubes (MWCNTs) in CuAlS2 nanoparticles, synthesized by high-energy ball-milling, and study the thermoelectric properties of the bulk materials. A vortex mixer and bath sonicator are used to achieve well dispersion of nanotubes in the matrix, and then the powder is hot-pressed. Carbon nanotubes dispersed in the matrix improve electrical conductivity and Seebeck coefficient. The addition of MWCNT causes an increase in the grain boundary and facilitates phonon scattering, resulting in a reduction in the lattice thermal conductivity and finally total thermal conductivity. The optimum amount of carbon nanotubes is effective for reducing thermal conductivity and increasing electrical conductivity, thereby elevating the figure-of-merit of the nanocomposites. Finally, the figure-of-merit is highly influenced by total thermal conductivity, and the maximum figure-of-merit was obtained for CuAlS2/0.5 wt% MWCNT composite, which indicated about 20% improvement.

Development of emphatic catalysts for waste water remediation via synchronized free radical and non-free radical routes with composites of strontium hexaferrite, graphene and multi-walled carbon nanotubes

Magnetic nanoparticles have shown exceptional potential in catalysis, however, their tendency to agglomerate has confined their use. The present work encompasses synthesis of eco-friendly and magnetic retrievable catalysts with different fractions of reduced graphene oxide (rGO) and multiwalled carbon nanotubes (MWCNT) as support for strontium hexaferrite (SrFe12O19) for the oxidative degradation of organic pollutants. The morphological, structural and magnetic properties of composites were estimated via PXRD, FT-IR, VSM, FE-SEM, HR-TEM, XPS and BET. The crystallite size decreased from 41.46 nm for SrFe12O19 to 35.85 nm and 33 nm for composites with 20% rGO and MWCNTs, respectively while the surface area increased substantially from 88.1 m2/g for SrFe12O19 to 118.4 and 131.3 m2/g. Further, the composites were employed as catalysts for the oxidative degradation of selected antibiotics and colourant via stimulation of two different oxidants, potassium peroxymonosulphate (PMS) and hydrogen peroxide (H2O2). The degradation followed pseudo first order kinetics with rate constant values increasing with rGO and MWCNT content. The increase in catalyst effectiveness can be ascribed to the synergistic interactions between rGO or MWCNT and SrFe12O19, which provided larger specific surface areas for adsorption and augmented number of catalytically active sites. Systematic chemical quenching studies unveiled a combined role of radical and non-radical species in oxidative degradation of pollutants. Moreover, the synthesized composites exhibited excellent recyclability upto four cycles forming the basis for their utilization as industrial catalysts.

Room temperature self-healing CIP/PDA/MWCNTs composites based on imine reversible covalent bond as microwave absorber

A novel room temperature self-healing carbonyl iron powder/ polydopamine@ multi-walled carbon nanotubes (CIP/PDA@MWCNTs) composites as microwave absorber covering the whole X frequency band were prepared in this study. In order to improve the impedance matching and dispersion of CIP in composites, it was encapsulated by PDA to form a core-shell structure. Meanwhile, the polydopamine modified carbonyl iron powder (CIP/PDA) was mixed with MWCNTs to enhance the performance of microwave absorption, so that the the composites possessed dielectric and magnetic losses. Moreover, the composites have self-healing property. When the content of CIP/PDA@MWCNTs is 20 wt%, the minimum reflection loss of the self-healing composites is −30.69 dB, and the bandwidth of RL less than -10 dB can reach up to 9.44 GHz, covering the entire X. Therefore, this room temperature self-healing CIP/PDA@MWCNTs composite will become an ideal microwave absorbing material for novel function device.

Electrochemical Detection of Dopamine Using a Prussian Blue Carbon Nanotube Composite Decorated with Agglomerated ZnO Particles

A Prussian Blue (PB) zinc oxide (ZnO) nanoparticle carboxylic acid-functionalized multiwalled carbon nanotube (PB/ZnO/COOH-MWNT) composite was fabricated for the determination of dopamine (DA). ZnO nanoparticles were tethered to COOH-MWNTs using sonication. Upon attachment of the PB to the ZnO/COOH-MWNTs, which consisted of ZnO nanoparticles 13 nm in diameter, the ZnO coalesced to larger clusters with an average diameter of 573 ± 4 nm. The current response versus various concentrations of DA was measured using chronoamperometry. The optimum conditions for DA measurements were at pH 7.0 using the oxidation current. The sensor has a linear dynamic range from 10 to 900 μM with a limit of detection of 0.378 ± 0.015 μM, suitable for practical neuroblastoma screening at the lower concentration range and process controls for polydopamine synthesis at the upper concentration range, important for modifying polymeric membranes for water purification.

Effect of ultraviolet radiation and water spraying on the mechanical properties of multi‐walled carbon nanotubes reinforced natural fiber and hybrid composites

AbstractThe main objective of this study was to investigate the effect of aging by ultraviolet radiation and water spray on the mechanical properties of natural fiber and hybrid composites. Pure jute, hybrid jute/glass, and glass fiber‐reinforced composites were fabricated. All these types of composites were further modified with 0.6 wt% of multi‐walled carbon nanotubes (MWCNTs) and their mechanical behavior was compared to the unmodified specimens. Tensile and flexural tests were used to measure the mechanical properties of unaged (control) and aged specimens. A scanning electron microscopy analysis was used to examine the fracture surfaces of the specimens tested. It was found that the aging process affected the mechanical properties of the composites studied in different ways. For jute and jute + MWCNT composites the properties decreased with increased exposure time. The hybrid jute/glass composites (unmodified and MWCNT modified) were less affected by aging and showed an insignificant change in tensile strength. The hybrid + MWCNT composites, showed an increase of approx. 7% in Young's modulus (1000 h) and 9% (500 h) and 17%, (1000 h) in flexural modulus when compared to the unexposed specimens. The MWCNTs had a positive effect on the mechanical properties of the glass + MWCNT aged samples.

Upcycling Waste Plastics into Multi-Walled Carbon Nanotube Composites via NiCo2O4 Catalytic Pyrolysis

In this work, multi-walled carbon nanotube composites (MWCNCs) were produced by catalytic pyrolysis of post-consumer plastics with aluminium oxide-supported nickel, cobalt, and their bimetallic (Ni/α–Al2O3, Co/α–Al2O3, and NiCo/α–Al2O3) oxide-based catalysts. The influence of catalyst composition and catalytic reaction temperature on the carbon yield and structure of CNCs were investigated. Different temperatures (800, 900, 950, and 1000 °C) and catalyst compositions (Ni, Co, and Ni/Co) were explored to maximize the yield of carbon deposited on the catalyst. The obtained results showed that at the same catalytic temperature (900 °C), a Ni/Co bimetallic catalyst exhibited higher carbon yield than the individual monometallic catalysts due to a better cracking capability on carbon-hydrogen bonds. With the increase of temperature, the carbon yield of the Ni/Co bimetallic catalyst increased first and then decreased. At a temperature of 950 °C, the Ni/Co bimetallic catalyst achieved its largest carbon yield, which can reach 255 mg g−1plastic. The growth of CNCs followed a “particle-wire-tube” mechanism for all studied catalysts. This work finds the potential application of complex oxide composite material catalysts for the generation of CNCs in catalytic pyrolysis of wasted plastic.