Polyaniline Nanocomposites Research Articles

Detailed investigation of structural, elastic, and thermal properties of PANI doped silver ferrites AgFe2O3/ZnO

We report the infrared absorption properties of polyaniline nanocomposites (AgFe2O3/ZnO) with different amounts of PANI (5 and 10 wt%) powder samples by in situ chemical oxidation polymerization synthesis. In contrast, silver ferrite nanomaterial has been synthesized using a hydrothermal approach. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) were used to characterize the prepared samples. Rhombohedral structures were seen in the pure (AgFe2O3/ZnO) and its PANI composites. The size of the crystallites was found between 30 to 40 nm. The SEM images of the composites confirmed the morphology of prepared samples. The FTIR spectrum for each of the samples consists of two wide absorption bands that correspond to the tetrahedral V1 and octahedral V2 sites bending vibrations. Force constants were found higher for tetrahedral sites as compared to octahedral sites. FTIR parameters have been used to calculate the Bulk modulus (B), Rigidity modulus (R), Young’s modulus (Y), and Poisson ratio (σ). Elastic parameters for PANI doped ferrites have improved significantly compared to pure AgFe2O3/ZnO ferrite due to strong inter atomic bonding. This can be beneficial in overcoming physical stresses that may arise during material fabrication and commercialization. Debye temperature increased with increasing PANI concentration.

Ag-CuO integrated polyaniline based impedimetric detection of cancer biomarker MUC1

MUC 1 is majorly over expressed in multiple malignancies especially breast cancer. Therefore, the reliable, cost effective and convenient detection of MUC1 is of great essence in the health care sector. In this regard, biosensors are the promising tool since it not only effectively mitigate the inherent setbacks of conventional techniques but also provides additional advantage of point-of-care diagnosis. With this aim, herein an impedimetric immunosensor based on silver doped copper oxide conjugated polyaniline (Ag-CuO@PANI) nanocomposite for sensitive detection of MUC1 has been developed. The facile synthesis of Ag-CuO@PANI was carried out by using hydrothermal method. Further, the Ag-CuO@PANI was deposited onto the FTO platform followed by the incubation of bi-functional linker cysteamine which permitted covalent and directional binding of the bio-recognition element i.e. antibody specific to MUC1 onto the Cys/Ag-CuO@PANI/FTO. After thorough characterization and optimization studies, the synthesized Ab/Cys/Ag-CuO@PANI/FTO based sensing platform was employed for the detection of MUC1 using electrochemical impedance spectroscopy (EIS) based transduction system in [Fe(CN)6]3-/4- redox couple. The immunosensor generated a satisfactory analytical outcome with linear dynamic range of 1–100 pg mL−1 and 1–100 ng mL−1 along with a low detection limit of 3.23 pg mL−1 and ultra-sensitivity of 0.68 kΩ pg mL−1 cm−2. Also, the adequate reproducibility (RSD ≤ 0.84%), high selectivity, long shelf life of 25 days at 4 °C storage condition and satisfactory performance in spike-in analysis (Recovery % within 96.4–102.7% with ≤ 2.48% RSD value) further emphasize the analytical metrics of the immunosensor.

An investigation of chemical oxidative polymerization and life cycle assessment of graphene oxide-grafted polyaniline nanocomposite for improved electrocatalytic performance

An investigation of chemical oxidative polymerization and life cycle assessment of graphene oxide-grafted polyaniline nanocomposite for improved electrocatalytic performance

Efficient hexavalent chromium removal through recyclable flower-like cerium phosphate polyaniline nanocomposite via adsorption-reduction pathway

The efficient removal of Cr(VI) from water is a crucial environmental concern, and in this study, the focus was on addressing this issue by investigating a new flower-like cerium phosphate polyaniline nanocomposite (CePO4-PANI) material. This material was synthesized using an in situ oxidative polymerization method, resulting in a flower-like morphology that was confirmed through field emission scanning electron microscopy and transmission electron microscopy images. The adsorption of Cr(VI) onto the material followed the pseudo-second-order kinetic model and the Langmuir isotherm model, with a high adsorption capacity of 129.87 ± 2.1 mg g−1 at room temperature in a wide pH range of 2 to 6. The CePO4-PANI nanocomposite is a promising adsorbent for the treatment of Cr(VI), with high tolerance to co-anions and efficient regeneration after multiple adsorption-desorption cycles. XPS spectra revealed the simultaneous adsorption of Cr(VI) and in situ chemical reduction to Cr(III) via electrostatic attractions and chelation methods. Its unique flower-like morphology, coupled with its impressive adsorption capacity, co-anion tolerance, and efficient regeneration, make it a promising alternative to existing technologies for water treatment.

Facile Fabrication of PANI/Fe2.85Ni0.15O4 Nanocomposites and Their Application for the Effective Degradation of Rhodamine B Dye

Nanocomposites of polyaniline (PANI)/Fe2.85Ni0.15O4 (PFN) were successfully prepared using the co-precipitation method combined with an in-situ polymerization process. The FN and PFN nanocatalysts were characterized using various methods for the photocatalytic degradation of Rhodamine B (RhB). The XRD, Raman, TEM, and DTA-DTG analyses suggest that the FN nanoparticles (NPs) were effectively coated by PANI and that there were interactions between FN and PANI. Magnetic measurements indicated that PFN nanocomposites exhibited good superparamagnetic behavior and high saturation magnetization (39.5–57.6 emu/g), which are suitable for separating photocatalysts from solution for reuse. Adsorption-desorption analysis showed that the specific surface area of PFN was higher than that of FN. The UV-vis absorption spectra of FN and PFN nanocomposites exhibited strong absorption of visible light, attributed to the doping of Ni, which resulted in the reduction of the band-gap energy (Eg) of Fe3O4 to 2.4 eV. PFN nanocomposites with different mass ratios of PANI demonstrated superior photocatalytic activity compared to FN NPs. Furthermore, it was observed that PFN with a 10% mass ratio of PANI exhibited the highest RhB degradation efficiency, achieving a rate of approximately 98% after 300 min of irradiation. Finally, the possible photocatalytic degradation mechanisms of the PFN nanocomposites on RhB were discussed. PFN photocatalysts with good photocatalytic activity, inexpensive materials, and easy preparation could be potential candidates for wastewater purification applications.

Fabrication of core-shell Co@HCN@PANI composite material with enhanced electromagnetic wave absorption

A core-shell Co@ hollow carbon nanospheres @ polyaniline nanocomposite for EMW absorption was constructed via soft template, switching liquid phase transport and in-situ polymerization method. Polarization at the interface of Co, HCN shell and PANI enhances the polarization loss of core-shell Co@HCN@PANI nanocomposite. The dense conductive network formed by PANI endows the material with a more significant electronic conduction loss mechanism. Multi-layer heterogeneous interfaces in core-shell structures and multi-centers in PANI molecular chains enrich the polarization relaxation loss mechanism. The natural resonance of magnetic Co at high frequency bands and eddy current thermal effect at low frequency bands ensure the stable magnetic loss of the material. Good impedance matching and enhanced attenuation coefficient further improve the microwave absorption performance of the nanocomposite. Consequently, a minimum reflection loss of −43.63 dB and an effective absorption bandwidth of 9.75 GHz (8–17.75 GHz) are obtained at a matched thickness of 2.8 mm.

Novel hybridization indicator for DNA sequences related to the hepatitis B virus: Electrochemical and in-silico approach

In the present study, esculetin, as a novel electroactive indicator, was used to produce an electrochemical DNA hybridization biosensor for Hepatitis B Virus (HBV) detection. At first, alkanothiol-modified DNA probe (from Hepatitis B) was self-assembled on the surface of a glassy carbon electrode modified by the nanocomposite of polyaniline and Au nanoparticles (PANI-Au). Hybridization conditions were enhanced, including the immobilization of the probe strands, the hybridization process and the indicator accumulation. For evaluating the DNA hybridization, the differential pulse voltammetric response of the accumulated esculetin was used as an electroactive indicator on different electrode surfaces. According to the obtained results, the voltammetric responses of esculetin accumulated on the probes interacted with non-complementary, mismatch and complementary targets were significantly different. Therefore, in optimum conditions, electrochemical signals of esculetin were linear in the concentration range of 0.01–3.00 × 10−6 M of the complementary strands, and a detection limit of 3.80 × 10−9 M was obtained for the target. Subsequently, the modified electrode was utilized for the detection of the HBV in spiked serum and plasma samples. The results obtained from electrochemical technique were confirmed by computational molecular simulation using MOE software. Moreover, the simulation outcomes provided valuable information about quantum chemical properties including the HOMO–LUMO maps and chemical reactivity for esculetin-the DNA target components.

High performance symmetric reduced graphene oxide/polyaniline/tellurium supercapacitor electrodes

The aim of this work is to overcome the problem of agglomeration and volumetric changes observed in reduced graphene oxide (rGO) and polyaniline (PANI) nanocomposites responsible for inferior capacitive performance. The synergistic effect of optimized rGO, PANI and tellurium (Te) ternary nanocomposite was investigated for the electrochemical performances for the energy storage devices. For this purpose, the electrochemical test was performed at low molar 0.1M H2SO4 concentration of aqueous electrolyte in a two-electrode cell assembly. The electrochemical studies showed that the specific capacitance of 564F g−1 is attained in rGO/PANI nanocomposite electrode cell whose capacitive performance showed an increase by adding different concentration of Te. The maximum specific capacitance of 895 F g−1 at 10 mV s−1 was observed in rGO/PANI/Te50 (GPT50) with negligible charge transfer resistance, knee frequency ∼466.63 Hz, low response time ∼17.39 s, high coulombic efficiency ∼92% and high energy and power densities of 41 −1 and 3679 −1 with cyclic stability of ∼91% after 5000 GCCD cycles respectively. The electrochemical performances result of the electrode material indicated that the combination of Te with rGO and PANI can be used to enhance the supercapacitor performances of the rGO/PANI nanocomposite electrodes. This novel composition has overall improved the electrochemical studies of the electrode materials and thus can be used as a suitable candidate for supercapacitor devices.

Mesoporous Cr2O3/MWCNTs/PANI nanocomposite as a high performance anode material for rechargeable lithium ion batteries

Chromium oxide (Cr2O3) has been considered as a promising anode material for lithium-ion batteries (LIBs). However, it is accompanied by a large volumetric expansion which compromises battery performance by damaging internal structure of the material. In this study, dual modification is achieved by developing Cr2O3 nanocomposite with multi-walled carbon nanotubes (MWCNTs) by inexpensive and reproducible co-precipitation method which reduces volume changes by enhancing electronic conductivity and mechanical strength. Meanwhile, polyaniline (PANI) coating was employed by in-situ polymerization of aniline monomer that promotes lithium-ion conductivity and facilitates high electron transportation, thus resulting in excellent stability. This research mainly signifies the effect of PANI coating, where PANI offers conductive contact between active material and electrolyte. The homogenous nanocomposite of Cr2O3-MWCNTs and PANI exhibit good electrochemical performance. A discharge capacity of Cr2O3-MWCNTs(12%)-PANI is found to be 815 mAh g−1 at 100 mA g−1 with coulombic efficiency of 97.5 %. Moreover, the nanocomposite exhibits good rate capability and cyclic stability.

Exploring the effects of ultra-low loading level of silver oxide nanoparticles on the dielectric, I-V characteristics and optical energy band gap of thermoplastic polyurethane and poly-aniline blend nanocomposites

This study deals with the exploration of ultra-low loading levels of Silver oxide (Ag2O) nanoparticles on the materials properties such as dielectric, I-V characteristics, and optical energy band gap of thermoplastic polyurethane (TPU) and Polyaniline (PANI) blend nanocomposites. The nanocomposites with varying loading levels of Ag2O nanoparticles have been fabricated using the most simplified solvent casting technique. The dispersion pattern of the Ag2O phase in the vicinity of the TPU and PANI Matric has been observed from the high-resolution transmission electron microscopic (HRTEM) analysis. The dielectric properties like dielectric permittivity(εʹ), AC conductivity (σac), Nyquist plot, etc., of the fabricated nanocomposites have been explored in a wide range of frequency of the applied electric field (1 -106Hz). The significant improvement in εʹ with a 3 wt% loading level of Ag2O is one of the outstanding findings of today’s research work. The obtained I-V characteristics indicate the formation of dielectric materials with pseudo-metallic behavior. The decrease in optical energy band gap with the addition of Ag2O ensures the suitability of the fabricated nanocomposites to be used in the construction of the solar cell. Dielectric properties ensure the suitability of the materials to be used in the construction of the buffer layer of solar cells and the fabrication of EMI shielding panels to be used in heavy electronics where radiation leakage is very frequent.

PANI encapsulated α-MnO2 nanocomposites as photocatalytic, antibacterial and anticorrosive agents: Sustainable experimental and theoretical studies

Metal nanoparticles and conducting polymers have applications in the fields like purification, separation, adsorption, photocatalytic, antibacterial, sensors, electrical conductivity, etc. The α-MnO2 nanoparticles, and polyaniline (PANI) were synthesized by the reverse micelle and chemical oxidative techniques, respectively. An in-situ technique was used for the synthesis of α-MnO2/PANI nanocomposites (NCs). The characterization of α-MnO2 nanoparticles and NCs was carried out by XRD, TEM, FTIR, and UV–visible techniques. The experimental data was supported by a theoretical (computational) study. Corrosion inhibition, antibacterial, and photocatalytic activity of α-MnO2/PANI NCs were explored. The NCs show a maximum of 87 ± 0.1% corrosion inhibition efficiency. The NCs (100 ppm concentration) degrade 89.15 ± 1.1% of methyl orange dye after 3 h of UV exposure. The photodegradation of dye follows pseudo-first order kinetics with a rate constant of 0.0657 min−1. The mechanism of photodegradation is supported by potentiostatic photocurrent measurement, impedance spectroscopy, pH variation, and chemical oxygen demand. The antibacterial property of NCs was compared to standard Hexa disk against Gram-positive and Gram-negative bacterial strains. The NCs show 18.5 mm and 15.3 mm Zone of Inhibition (1000 ppm) for S. epidermis and E. coli, respectively. The α-MnO2/PANI NCs show very good anti-corrosive, antibacterial, and photocatalytic properties.

Nanocomposites of polyaniline and polymethacrylic acid

Polymer-polymer composites based on polyaniline and polymethacrylic acid were obtained. The electrical conductivity, heat resistance, X-ray spectra of the obtained composites were studied. Intermolecular hydrogen bonds are formed between the components of the composite. Increasing the content of polymethacrylic acid in the composite increases its heat resistance. The process of thermal destruction of polyaniline, polymethacrylic acid and composite is complex and takes place in several stages. The conducted quantum chemical calculations confirm the conclusion about the formation of intermolecular hydrogen bonds between the components of the composite.

Reversible room temperature ammonia sensor based on the synthesized MoS2/PANI nanocomposites

Successful fabrication and optimization of molybdenum disulfide (MoS2)/polyaniline (PANI) nanocomposite-based room temperature ammonia sensors have been reported in this work. The hydrothermal technique was used to synthesize nanocomposites of MoS2 and PANI at different amounts of PANI. For this, the precursor values were changed by choosing three different values of 0.65 (MP1), 1.1 (MP2), and 2.2 (MP3) for the ammonium heptamolybdate/PANI weight ratio. Successful fabrication of nanocomposites was confirmed by Raman analysis and x-ray diffraction. According to FESEM images, MoS2/PANI nanocomposites have been composed of 1D-PANI nanofibers covered by 2D-MoS2 nanosheets and created a porous morphology that influenced their sensing characteristics significantly. The samples’ ability to detect ammonia at room temperature was examined by fabricating sensor devices using the synthesized MoS2, PANI, and nanocomposites. The fabricated sensor using MP2 showed much better gas-sensing properties than other samples. This sensor showed about 4.6 and 1.6 times higher response than pristine PANI and MoS2 sensors for 10 ppm of ammonia, respectively, with better selectivity toward ammonia than other gas species. This research shows that compositing PANI with MoS2 significantly improves the gas detection performance of MoS2.

Temperature dependent charge transport properties of polyaniline/NiO nanocomposite

Pristine Polyaniline (PANI) and Nickel oxide (NiO) nanoparticles (NPs) nanocomposite were synthesized by in-situ polymerization synthesis route with 1 wt% of NiO NPs in PANI matrix. X-ray diffraction (XRD) pattern of samples reveals that the prepared samples are semi-crystalline in nature with the dominated peak at ∼ 25° over the broad hump. Also, some order of crystallinity of composite was also observed in X-ray diffraction pattern which may be due to interface of PANI with NiO NPs. FTIR spectra confirm the formation of desired samples as well as existence of NiO NPs in PANI polymer matrix. After the structural and molecular studies, these samples were also characterized for electrical (DC conduction) study. It was observed that the DC conductivity of the samples increases by doping NiO NPs in PANI. Also, the conductivity increases with temperature for both samples, supporting semi-crystalline nature of the samples. The calculated values of electrical conductivity for PANI and PANI/NiO composite are found to be 0.51x10-3 and 0.77x10-3 S/cm, respectively. Mott’s VRH model suggested the hopping mechanism for the conductivity. The calculated values of Mott’s hopping energy are 66.9 and 58.2 meV for pristine and composite sample, respectively.

Probing the Electro-Chemical and Thermal Properties of Polyaniline/MWCNT Nanocomposites

The tremendous interest for robust, clean energy storage devices to comprehend the growing needs of modern gadgets has led to exploration of materials having unprecedented electrochemical and interfacial properties. Here, the present study deals with the synergistic effects of multi walled carbon nanotubes and polyaniline nanocomposites on the electro-chemical and thermal properties for wide-range of applications. The microstructural, structural, and optical characterizations have been evaluated through scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and UV-Vis spectrophotometry. The thermal stability of the product was also studied through thermal gravimetric analysis (TGA) and the room temperature electrical conductivity was also measured. An exceptional enhancement in thermal stability and conductivity has been observed apparently due to interfacial properties of polyaniline (PANI) and multiwalled carbon nanotubes (MWCNTs). Further, in present study we are going to report a comparative analysis of thermal and electrical properties of PANI/MWCNT nanocomposites with different loadings of MWCNTs. The room temperature conductivity as calculated for 1%, 2%, 4% and 8% MWCNT loading is around 2.019, 3.075, 4.48, 8.73 S/cm respectively. The mechanism for thermal and electrical enhancements in PANI-coated MWCNT nanocomposites is also expounded.

Synthesizing and Using Iron Oxide Nanoparticles as Nanocomposite in Cotton Fabrics Nanofinishing

Metal oxide nanoparticles, including iron oxide, are highly considered as one of the most important species of nanomaterials in a varied range of applications due to their optical, magnetic, and electrical properties. Iron oxides are common compounds, extensive in nature, and easily synthesized in the laboratory. In this paper, iron oxide nanoparticles were prepared by co-precipitation of (Fe+2) and (Fe+3) ions, using iron (II and III) sulfate as precursor material and NH4OH solution as solvent at 90°C. After the synthesis of iron oxide particles, it was characterized using X-ray diffraction (XRD), infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). These tests confirmed the obtaining of iron oxide nanoparticles with a crystalline structure in the form of (spinel), and the size of nanoparticles ranging from 13-24 nm. Iron oxide and polyaniline nanocomposite were used to apply in cotton fabrics. The iron oxide nanoparticles were dispersed with different percentage concentrations 0.5, 1, 2, 5, and 10% in the polymeric solution. Then the cotton samples were treated with the prepared nanocomposite. The electrical conductivity was measured using the four probes method, and it was found that the treated cotton fabrics acquired the electrical conductivity that they did not have before. The ultraviolet transmittance of the treated samples was also measured, and it was noted that the transmittance of the treated samples decreased compared to the untreated sample due to the absorption of ultraviolet rays by iron oxide particles, especially in the UVC field.

Improvement of the glass transition temperature in novel molybdenum carbide doped polyaniline nanocomposites

Several studies have revealed that the glass transition temperature (Tg) of polymer nanocomposites (PNCs) may change upon the loading of even a small number of nanoparticles (NPs). However, the exact phenomenon behind such shifting in Tg is still not well known. This study uses experimental and MD simulation approaches to explore the physics of the Tg of polyaniline (PANI) nanocomposite with molybdenum carbide (Mo2C) nanoparticles at different weight percentage loading of NPs. The experimental study shows that, at a lower wt-% loading of NPs, the Tg of the resulting PNCs decreases slowly, and above a particular loading wt-%* (30 wt-%), the depression in Tg becomes more serious. The SEM images show that for wt-% < wt-%*, NPs remain diffuse in the polymer matrix, and for wt-%t > wt-%* a large number of NPs surround the polymer. The MD simulation reveals a slow increase in the diffusion of polymer and NPs for wt-% < wt-%* and a sudden increase for wt-%t > wt-%*. The measurement of the radius of gyration of the polymer reveals swelling of the polymer for wt-% < wt-%* and contraction of the polymer for wt-%t > wt-%*. Moreover, the variations of the diffusion constants and the radius of gyration of the polymer are consistent with the Tg behaviour of PNCs.

Enhanced Sensing Performance of an Ammonia Gas Sensor Based on Ag‐Decorated ZnO Nanorods / Polyaniline Nanocomposite

AbstractThe development of low‐cost ammonia sensors with high sensitivity and selectivity has gained considerable interest. Though the response of these sensors at room temperature is low and needs enhancement. In the present study high sensitivity ammonia gas sensors based on nanocomposite films of polyaniline (PANI) and with varying ZnO concentrations were synthesized and investigated. With a loading of 10 at% ZnO, the gas sensing response of 59 % was obtained for 120 ppm NH3 gas. The gas response was further enhanced by decorating the ZnO nanorods with different concentrations of silver (Ag) nanoparticles. The Ag‐decorated ZnO nanorods were embedded in the PANi matrix using the in‐situ oxidative polymerization technique. It was shown that PANi ZnO, p‐n junction, and the introduction of porosity in nanocomposite act synergistically in increasing the resistance caused by the deprotonation of PANi by NH3. Among various compositions studied, 2 % loading of Ag in ZnO embedded in PANi matrix, thin films were found to be highly selective and sensitive towards NH3 gas at room temperature with a chemiresistive response of 70 % at 120 ppm and a recovery time of less than 120 s. The selectivity of the nanocomposite was also studied towards various reducing and oxidizing gasses.

Coal Fly Ash Decorated with Graphene and Polyaniline Nanocomposites for Effective Adsorption of Hexavalent Chromium and Its Reuse for Photocatalysis.

Coal fly ash was functionalized and modified with graphene oxide and polyaniline (CFA/GO/PANI nanocomposite) through hydrothermal synthesis, which was used for remediation of hexavalent chromium (Cr(VI)) ions. Batch adsorption experiments were carried out to investigate the effects of adsorbent dosage, pH, and contact time on the removal of Cr(VI). The ideal pH for this work was 2, and it was used for all other studies. The Cr(VI)-loaded spent adsorbent CFA/GO/PANI + Cr(VI) was reused as a photocatalyst for the degradation of bisphenol A (BPA). The CFA/GO/PANI nanocomposite removed Cr(VI) ions rapidly. The adsorption process was best described by pseudo-second-order kinetics and the Freundlich isotherm model. The CFA/GO/PANI nanocomposite demonstrated a high adsorption capacity of 124.72 mg/g for Cr(VI) removal. In addition, the Cr(VI)-loaded spent adsorbent played a significant role in the photocatalytic degradation of BPA with 86% degradation. The reuse of the Cr(VI)-loaded spent adsorbent as a photocatalyst presents a new solution for the reduction of secondary waste from the adsorption process.

Multi-walled carbon nanotubes decorated polyaniline- α-Fe2O3 nanocomposite as an efficient photoanode for photoelectrochemical water splitting and photoelectrochemical cathodic protection of mild steel

In this research, polyaniline nanocomposites with iron (III) oxide and multi-walled carbon nanotubes (PANi-Fe and PANi-Fe-CNT) were synthesized and successfully characterized by various techniques such as X ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, Field emission scanning electron microscopy (FESEM), and X-ray energy dispersive spectroscopy (EDS). The photoelectrochemical (PEC) performance of PANi, α-Fe2O3 nanoparticles, PANi-Fe and PANi-Fe-CNT on indium tin oxide (ITO) substrate was evaluated by linear sweep voltammetry (LSV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) in the dark and under simulated sunlight (100 mW/cm2). The results showed that ITO/PANi-Fe-CNT photoanode had higher photocurrent density (1.05 mA/cm2), more significant applied bias photo-to-current efficiency percentage (0.16%), and smaller charge transfer resistance (1008 Ωcm2) than other photoanodes under light irradiation. To study the photoelectrochemical cathodic protection (PEC cathodic protection) properties, the pastes were prepared from synthesized compounds and doctor-bladed on the pre-treated titanium (Ti) substrates and used as the photoanodes for the protection of mild steel. The performance of the as-prepared photoanodes in photoelectrochemical cathodic protection of mild steel was investigated using electrochemical impedance spectroscopy (EIS) and Tafel polarization. The corrosion potential (Ecorr) of mild steel decreased from −706 mV (without connection to the photoanode) to −864 mV in the state of connection to Ti/PANi-Fe-CNT photoanode under light irradiation, which indicated its cathodic protection.