Electrostatic Method Research Articles

Fabrication and electrochemical properties of electrode composites for oxide-type all-solid-state batteries through electrostatic integrated assembly

All-solid-state batteries, which use flame-resistant solid electrolytes, are regarded as safer alternatives to conventional lithium-ion batteries for various applications including electric vehicles. Herein, we report the fabrication of cathode composites for oxide-type all-solid-state batteries through an electrostatic assembly method. A polyelectrolyte is used to adjust the surface charge of the matrix particles to positive/negative, and the aggregation resulting from electrostatic interactions is utilized. Composites consisting of cathode active material particles (LiNi1/3Mn1/3Co1/3O2 (NMC) or LiNi0.5Mn1.5O4 (LNMO)), solid electrolyte particles Li1.3Al0.3Ti1.7(PO4)3 (LATP), and electron conductive one-dimensional carbon nanotubes (CNT) are formed via an electrostatic integrated assembly of colloidal suspensions. Electrostatic integration increases the electronic conductivity by two orders of magnitude in the NMC–LATP–CNT composite (6.5 × 10−3 S cm−1/3.2 × 10−5 S cm−1) and by six orders of magnitude in the LNMO–LATP–CNT composite (6.4 × 10−3 S cm−1/2.3 × 10−9 S cm−1). The dispersion of CNTs in the cathode composite is enhanced, resulting in percolation of e− path even at 1 wt% (approximately 2.5 vol%) CNT. This study indicates that an integrated cathode composite can be fabricated with particles uniformly mixed by electrostatic interaction for oxide-type all-solid-state batteries.

Preparation and Characterization of Ag Nanoparticle/SiO2 Composite for Optical Application

A facile method to fabricate volumetric light-guide plate (LGP) by micro-nanostructure of Ag/SiO2 composite was presented in this study. The Ag NPs/SiO2 composite were first prepared from a mixture of yellowish-brown Ag NPs colloids and SiO2 powder by electrostatic self-assembly method. Its chemical and physical properties were investigated by scanning transmission microscopy (TEM), scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDX). The small particles (Ag/SiO2 composite) in the LGP could produce multiple scattering effect with different size of micro-nanoparticles, which could improve the light-scattering performance of the LGP. The effective light scattering of the material into LGP was obtained from the increased amount of the particles. Meanwhile, surface plasmon resonance effect of Ag NPs also improves the performance of LGP, which could be further applied to design device in optical application. In additional, optical properties and light scattering mechanism of the Ag NPs/SiO2 composite in the LGP are discussed and presented.

Electrostatic spraying preparation of Si/NiF2/PVDF energetic composites and their reaction characteristics

Metastable intermolecular composites are widely used in energy-demanding fields, where metal fluorides/fluoropolymers as oxidants have been a hot research topic in recent years. In this study, Si/NiF2/PVDF ternary energetic composites were prepared by the electrostatic spraying method for the first time, where NiF2 functions as the oxidant. At the same time, PVDF serves as both the oxidant and the binder. The energetic characteristics of the samples were studied through thermal analysis and preliminary ignition and combustion tests. It is found that the prepared samples are generally in the form of microspheres, in which PVDF binds Si and NiF2 particles together. The addition of Si nanopowder can promote the early decomposition of NiF2, which can improve reactivity. Compared with a physically mixed counterpart, the exothermic reaction between Si and PVDF in microspheres starts at lower temperatures and proceeds to more completion. The electrostatically sprayed sample also shows a shorter combustion time and a more intense luminescence phenomenon.

Self-Powered Infrared Photodetectors with Ultra-High Speed and Detectivity Based on Amorphous Cu-Based MOF Films.

Amorphous metal-organic frameworks (aMOFs) start to challenge their crystalline equivalents due to their unique advantages, like lack of grain boundaries, isotropy, flexibility, numerous defects-induced active sites, etc. However, aMOFs are typically synthesized under rigorous conditions, and their properties and applications need to be further explored. In this work, highly transparent p-type amorphous Cu-HHTP films consisting of Cu2+ and 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) were synthesized using a simple electrostatic spinning method and identified as p-a-Cu-HHTP. Besides, a p-a-Cu-HHTP/n-Si infrared photodetector (PD) operating on a self-powered basis with ultra-high speed (response time of 40 μs) and detectivity (1.2 × 1012 Jones) has been developed, with a response time and detectivity that are record values for a MOF-based photodetector. In particular, the p-a-Cu-HHTP/n-Si PD can withstand high temperatures up to 180 °C without property change. Moreover, a flexible metal-semiconductor-metal photodetector based on p-a-Cu-HHTP is constructed, which shows excellent mechanical stability and photoresponse that remain unchanged after bending 120 times, implying its suitability for wearable optoelectronics. The new method to fabricate aMOFs, the unique p-a-Cu-HHTP, and its PDs initiated in this work opens up a new avenue in organic-inorganic hybrid optoelectronics.

High-quality electrostatic recycling of waste carbon fiber via spark-driven shock waves and Joule heating

The recycling of waste carbon fibers (CF) has emerged as a crucial research area for both environmental protection and economic sustainability. To sufficiently exert the potential and extend the application life cycle of CFs, here we propose an eco-friendly and efficient electrostatic method for rapid recycling of tightly entangled reclaimed carbon fibers (rCFs) by spark-driven disentanglement and depolymerization. Our research indicates that the spark discharge generated by fiber induction under low-voltage conditions can excite the shock waves and Joule heating effects, resulting in the separation of individual rCFs and the removal of surface organic matrix. Furthermore, the constructed electric field can synchronously and continuously orient the dispersed rCFs to form a vertical alignment in a short time with good maneuverability and directionality for reutilization. The results demonstrate that this one-step disentanglement, depolymerization, and alignment method achieves a high-quality recycling process with 100% dispersion efficiency, minimal damage, cost-effectiveness, uniform distribution, upright orientation, and high-speed embedding performance. Our findings reveal the potential of the electrostatic strategy for the high-quality recycling of rCFs, in line with the principles of the circular economy. The proposed method offers broad prospects for application in continuous in-line production and material manufacturing, and is a step towards sustainable and cost-effective CF recycling.

Effects of electric field on the filtration characteristics of solid particles in oil

The presence of solid particles in oil can easily lead to surface failure of machine components. In order to reduce the harmful effects of solid particles, it is necessary to remove solid particles from oil. The electrostatic method is an efficient method for removal of solid particles under an applied electric field. However, the filtration mechanism for solid particles in mixed oil–solid systems using electrostatic methods has not been fully investigated. In view of this, an oil–solid separation method based on electric field enhancement is proposed. For this method, a numerical model of oil–solid separation under different electric field strengths is established by coupling the electric and flow field governing equation, the particle-wall collision equation, and the discrete phase tracking equation. Solved by finite element method, the influence of electric field on particle motion and filtration performance of the system is studied. The results indicated that in the mixed oil–solid system, the filtration efficiency is significantly increased by more than 32.97% when an electric field is used. When E > 1 kV/mm, the flow rate of particles into and out of the filter increased with increasing electric field intensity, the deposition became more dispersed, the highest deposition concentration was 3.69 times that without an electric field, and the filtration efficiency decreases but does not exceed 10% as the flow rate increases. When the particle size is greater than 30 µm, the filtration efficiency increases by at least 14.71% for every 1 kV/mm increase in electric field strength, up to a maximum of 97.65%.

Synergistically boosting reaction kinetics and suppressing polyselenide shuttle effect by Ti3C2Tx/Sb2Se3 film anode in high-performance sodium-ion batteries

Antimony selenide (Sb2Se3), with rich resources and high electrochemical activity, including in conversion and alloying reactions, has been regarded as an ideal candidate anode material for sodium-ion batteries. However, the severe volume expansion, sluggish kinetics, and polyselenide shuttle of the Sb2Se3-based anode lead to serious pulverization at high current density, restricting its industrialization. Herein, a unique structure of Sb2Se3 nanowires uniformly anchored between Ti3C2Tx (MXene) nanosheets was prepared by the electrostatic self-assembly method. The MXene can impede the volume expansion of Sb2Se3 nanowires in the sodiation process. Moreover, the Sb2Se3 nanowires can reduce the restacking of Ti3C2Tx nanosheets and enhance electrolyte accessibility. Furthermore, density functional theory calculations confirm the increased reaction kinetics and better sodium storage capability through the composite of Ti3C2Tx with Sb2Se3 and the high adsorption capability of Ti3C2Tx to polyselenides. Therefore, the resultant Sb2Se3/Ti3C2Tx anodes show high rate capability (369.4 mAh/g at 5 A/g) and cycling performance (568.9 and 304.1 mAh/g at 0.1 A/g after 100 cycles and at 1.0 A/g after 500 cycles). More importantly, the full sodium-ion batteries using the Sb2Se3/Ti3C2Tx anode and Na3V2(PO4)3/carbon cathode exhibit high energy/power densities and outstanding cycle performance.

Effect of High-Entropy Spinel Ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 Doping Concentration on the Ferroelectric Properties of PVDF-Based Polymers.

Polyvinylidene fluoride (PVDF)-based dielectric energy storage materials have the advantages of environmental friendliness, high power density, high operating voltage, flexibility, and being light weight, and have enormous research value in the energy, aerospace, environmental protection, and medical fields. To investigate the magnetic field and the effect of high-entropy spinel ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 nanofibers (NFs) on the structural, dielectric, and energy storage properties of PVDF-based polymers, (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 NFs were prepared via the use of electrostatic spinning methods, and (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4/PVDF composite films were prepared via the use of the coating method. The effects of a 0.8 T parallel magnetic field, induced for 3 min, and the content of high-entropy spinel ferrite on the relevant electrical properties of the composite films are discussed. The experimental results show that, structurally, the magnetic field treatment causes the originally agglomerated nanofibers in the PVDF polymer matrix to form a linear fiber chain with different fiber chains parallel to each other along the magnetic field direction. Electrically, the introduction of the magnetic field enhanced the interfacial polarization, and the (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4/PVDF composite film with a doping concentration of 10 vol% had a maximum dielectric constant of 13.9, as well as a low energy loss of 0.068. The high-entropy spinel ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 NFs and the magnetic field influenced the phase composition of the PVDF-based polymer. The α-phase and γ-phase of the cohybrid-phase B1 vol% composite films had a maximum discharge energy density of 4.85 J/cm3 and a charge/discharge efficiency of 43%.

High-zeta-potential accelerates interface charge transfer in lithium anodes via MXene-graphdiyne heterojunction layers

Lithium (Li) metal anodes are a crucial part of lithium-based batteries and are highly regarded as a top contender for achieving high-energy–density lithium batteries. However, the development of dendrites and other related issues have significantly impeded their practical applications. Here, we fabricated a MXene (Ti3C2Tx)-graphdiyne heterostructure layer anode with high-zeta-potential (−90 mV) using an electrostatic self-assembly method. The high-zeta-potential can accelerate the interface charge transfer in the lithium deposition process, facilitating the uniform Li nucleation on the surface of anodes. Theoretical simulations further reveal that the high-zeta-potential can not only reduce the lithium ion concentration gradient but also homogenize the electric field in the anodes. Besides, based on first-principles computation, the adsorption energy of lithium atoms on MXene-graphdiyne heterostructure is − 3.4 eV. As a result, a low overpotential of 12.4 mV has been achieved by MXene-graphdiyne layers at 0.05 mA cm−2. Additionally, MXene-graphdiyne-Li anodes display an ultralong cycle life upto 1400 h and good rate capability upto 8 mA cm−2 in symmetric cells. Full cells consisting of MXene-graphdiyne-Li anodes and LiFeO4 cathodes also show stable cyclic properties (300 cycles at 5C).

Constructing coconut shell biochar/MXenes composites through self-assembly strategy to enhance U(VI) and Cs(I) immobilization capability

Herein, a biochar-based composite (Ti3C2Tx@biochar-PDA/PEI) was constructed by decorating Ti3C2Tx and polydopamine on coconut shell biochar via electrostatic self-assembly method. Different characterization techniques were applied to explore the structure, morphology and composition of the sorbents. It was found that the higher porosity and diverse functional groups were conducive for Ti3C2Tx@biochar-PDA/PEI to capture radionuclides, and the water environmental conditions made a great contribution to the adsorption process. The process of removing U(VI)/Cs(I) well complied with the Langmuir isotherm and Pseudo-second-order equations, which indicated that the single layer chemical adsorption occurred on the solid liquid interface. Meanwhile, this produced composite exhibited superior removal performance under complex co-existing ion environment, and the maximum adsorption amounts of U(VI) and Cs(I) reached up to 239.7 and 40.3 mg g−1. Impressively, this adsorbent still exhibited good adsorption performance after three cycles of regeneration. The spectral analysis and DFT calculation demonstrated that adsorption of U(VI) might be a chemical process, while the adsorption of Cs(I) should be ion exchange or electrostatic attraction. This study demonstrated the potential application of Ti3C2Tx@biochar-PDA/PEI as an effective remediation strategy for radioactive wastewater cleanup.Graphical

Preparation of diatomite-based SA@ZIF-8 composite microspheres by electrostatic spray method and its adsorption performance for Cu(II)

Diatomite (DE)-based sodium alginate (SA) loaded ZIF-8 composite microspheres were prepared by high-voltage electrostatic spray technology. SA/DE microspheres were prepared by SA and acid-base-regulated silica sol solution. Ultra-small ZIF-8 was grown on SA/DE microspheres by in-situ synthesis method to obtain ultra-high specific surface area composite microspheres. The morphology and particle size of the composite microspheres were analyzed by SEM, and characterized by FT-IR, XRD and TGA. The optimum adsorption efficiency were achieved by a series of conditions optimization. The adsorption of Cu(II) by SA/DE@ZIF-8 conforms to the Langmuir adsorption model, and the theoretical maximum adsorption capacity is 599.07 mg/g. In summary, this study opens up a new strategy for the design of efficient and easily recycled ZIF-8 composite microspheres for water treatment.

Bimetallic sulfides embedded into porous carbon composites with tunable magneto-dielectric properties for lightweight biomass- reinforced microwave absorber

Currently, biomass-derived porous carbon materials have great potential for the development of advanced microwave absorbing materials (MAMs) with lightweight, high performance, wide effective bandwidth (EAB), and thin matching thickness. Herein, we reported low-cost, high-performance MAMs for the successful anchoring of Cu-based bimetallic sulfides CuCo2S4@CoS2 on biomass porous carbon (BPC) derived from pistachio shells using a simple carbonization, hydrothermal, and electrostatic self-assembly method. The results demonstrate that the prepared BPC@CuCo2S4@CoS2 composite exhibits excellent microwave absorption due to its balanced impedance matching and the combined effect of conductive loss, dipole polarization, interfacial polarization, dielectric loss, and magnetic loss. To be precise, the minimum reflection loss (RLmin) of BPC@CuCo2S4@CoS2 reaches −64.2 dB at a packing load of 20 wt%, with an EAB of 6.6 GHz and a thickness of 2.3 mm. This work provides new insights into the study of copper-based bimetallic sulfide and BPC composites in MAMs.

Extremely stable Li-metal battery enabled by piezoelectric polyacrylonitrile quasi-solid-state electrolytes

Polymer solid-state electrolytes (PSSEs) are promising for solving the safety problem of Lithium (Li) metal batteries (LMBs). However, PSSEs with low modulus in nature are prone to be penetrated by lithium dendrites, resulting in short circuit of LMBs. Here, we design and prepare piezoelectric BaTiO3 doped polyacrylonitrile (PAN@BTO) quasi-solid-state electrolytes (PQSSEs) by electrostatic spinning method to suppress dendritic growth. The piezoelectric polymer electrolytes are squeezed by nucleation and growth processes of Li dendrites, which can generate a piezoelectric electric field to regulate the deposition of Li+ ions and eliminate lithium bud. Consequently, piezoelectric PAN@BTO PQSSEs enables highly stable Li plating/stripping cycling for over 2 000 h at 0.15 mA/cm2 at room temperature (RT, 25 °C). Also, LiFePO4|PAN@BTO|Li full cells demonstrate excellent cycle performance (136.9 mA·h/g and 78% retention after 600 cycles at 0.5 C) at RT. Moreover, LiFePO4|PAN@BTO|Li battery show extremely high safety and can still work normally under high-speed impact (2 Hz, ∼30 kPa). We construct an in-situ cell monitoring system and disclose that the mechanism of suppressed lithium dendrite is originated from the generation of opposite piezoelectric potential and the feedback speed of intermittent piezoelectric potential signals is extremely fast.

BiFeO3-Based All Perovskite Oxides Direct Z-Scheme Heterostructure for Efficient Oxygen Evolution

BiFeO3 (BFO) has gained significant attention recently in photocatalytic water splitting due to its visible light active profile and facile synthesis design. However, a single component photocatalyst usually suffers from significant photoexcited charge-carrier recombination. To overcome this problem, BFO nanocuboids are coupled with two-dimensional Ca2Nb3O10 (CNO) nanosheets via a facile electrostatic self-assembly method. The surface charge of BFO nanocuboids is modulated via deposition of Co-nanoparticles to obtained positively charged BFO-Co nanocuboids. Resultantly, the combination of positively charged BFO-Co nanocuboids and negative charged CNO nanosheets demonstrated a direct Z-scheme heterojunction. The optimized BFO-Co/CNO heterostructure achieved outstanding photocatalytic O2 evolution (48.19 mmol g–1), which is 6.72 times higher than pristine BFO (7.17 mmol h–1 g–1). Different characterization confirmed that BFO-Co/CNO heterostructures exhibited improved charge-carrier separation and utilization compared to individual components. This improved response can be associated with a better contact interface between the oppositely charged surfaces with the added advantage of the perovskite nature of both components. As a result, BFO-Co/CNO heterostructures achieved the highest O2 evolution response for BFO-based heterostructures to date. This study offers a novel strategy for modulating the BFO nanocuboids surface charge via Co-nanoparticles deposition, which concomitantly worked as a cocatalyst, a potential strategy that can be applied for the design of various heterostructures.

Study of ZnO‐coated Modified Hollow Microsphere Insulation Coated Fabrics

AbstractIn this study, new ZnO/TEMs composites were prepared using the electrostatic gravitational method, which combines the high reflectivity of ZnO with the low thermal conductivity of TEMs to create materials with excellent thermal insulation and heat preservation properties. The initial test results indicate that the ZnO‐coated TEMs are effective in blocking thermal radiation from sunlight, with thermal conductivity of 0.0523 W/m ⋅ K for the ZnO/TEMs microsphere coating. In addition, the internal and external temperature difference of ZnO/TEM‐C 1200 is 7 °C lower than that of cotton fabric under an optical power of 350 mW/cm2. Moreover, the ZnO/TEM‐C 1200 has a UPF value of up to 1894 and a total solar reflectance of 81.40 % in the 200–2500 nm wavelength range. These findings demonstrate the potential of ZnO/TEMs composites for use in thermal insulation and UV protection applications.

Reaction pathways control of long-chain alkanes hydroisomerization and hydrocracking via tailoring the metal-acid sites intimacy

Designing a bifunctional catalyst to achieve efficient hydroisomerization of long-chain alkanes is very essential for producing high-performance fuel and lubricant base oils. Herein, a bifunctional catalyst composed of an intimate mixture of ZSM-48 zeolite and alumina binder and with platinum (Pt) metal controllably deposited on zeolite or alumina was fabricated by a strong electrostatic adsorption method. The dependence of reaction pathways of hydroisomerization and hydrocracking of n-hexadecane on the metal-acid sites intimacy was investigated. High Brønsted acid density and suitable metal-acid sites intimacy favored to promote the catalytic activity. The selectivity, hydroisomerization mechanism and hydrocracking mechanism were significantly altered by tailoring the metal-acid sites intimacy. Too large or too small metal-acid sites intimacy was conducive to inhibit the occurrence of pore-mouth mode. A linear decease of the hydroisomerization selectivity with the increase of acid steps (nas) was observed. The catalyst with nanoscale intimacy of metal-acid sites (Pt/A-48) showed the highest catalytic activity and isomer selectivity (87%) and the least acid steps (nas = 1.4). This work provides a promising approach to fabricating highly efficient and shape-selective bifunctional catalysts for selective hydroisomerization of long-chain alkanes. A reaction network was proposed over the catalysts with different metal-acid intimacy.

Preparation and characterization of Al@TKX-50@NC composite microspheres by electrospray

Micro-nano composite energetic materials have attracted extensive attention from researchers due to their excellent properties. Electrostatic spray drying, as an emerging composite material preparation technology, has an important impact on the assembly and energy release regulation of energetic materials. In this paper, NC with excellent mechanical properties was selected as the energetic binder. The uniform assembly of TKX-50 and Al was achieved by electrostatic spraying technology, and Al@TKX-50@NC micro-nano composite energetic material microspheres were prepared. The structure and composition of the composite were characterized, and its thermal decomposition kinetics and thermodynamics were calculated and analyzed. At the same time, its ignition and combustion performance were tested. It is found that the samples prepared by electrostatic spray are regular spherical, and the particle size is about 1–6 μm. Compared with the physical mixture samples, the Al@TKX-50@NC composite microspheres not only have a more complete oxidation reaction but also have better ignition and combustion performance. The results show that the electrostatic spray method is very effective in improving the energy release of composite energetic materials.

An Investigation on Reduction of Calcium Added Bauxite Residue Pellets by Hydrogen and Iron Recovery through Physical Separation Methods

This study investigates the properties of H2-reduced calcium-added bauxite residue, self-hardened pellets, and the feasibility of iron recovery through electrostatic and magnetic separation methods. The oxide pellets are prepared via a mixing of bauxite residue, calcite, and quicklime. The self-hardened pellets are reduced at 1000 °C with hydrogen gas flow for 120 min. The chemical composition, phase identification, and microstructural observations are executed using X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM), respectively. The porosity and strength of the self-hardened pellets are performed by the Mercury intrusion porosimetry and tumbling tests, respectively. The separation of iron is examined through a dry electrostatic technique, and in wet conditions, i.e., via Davis Tube and low-intensity magnetic separation (WLIMS). The effect of the magnetic field (0.1, 0.25, and 0.32 T) is tested on two different particle size fractions (−212 + 106 µm and −106 + 74 µm). It is found that most of the iron oxide in the bauxite residue is converted to metallic iron, which corresponds well with both XRD and SEM results. The Carpco electrostatic tests indicate that this approach is inefficient for the studied type of material because of the intensive association of iron with the rest of the components leading to transferring it to the middling rather than to conductive product. However, both the Davis Tube and WLIMS approve a reasonable improvement in the Fe content from 22% to 37% with acceptable recoveries. The results of the Davis Tube show that there is an optimum magnetic field and particle size for maximization of Fe grade and recovery. Finally, further suggestions are highlighted for the physical beneficiation of studied bauxite residue with the purpose of maximizing iron grade and recovery.

Nb2C MXene self-assembled Au nanoparticles simultaneously based on electromagnetic enhancement and charge transfer for surface enhanced Raman scattering

Recent years, two-dimensional transition metal carbonitrides (MXene) have attracted much attention in the field of surface-enhanced Raman scattering (SERS). However, the relatively low enhancement of MXene is a major challenge. Herein, Nb2C-Au NPs nanocomposites were prepared by electrostatic self-assembly method, which have a synergistically conjugated SERS effect. The EM hot spots of Nb2C-Au NPs are significantly enlarged and expanded, while the surface Fermi level is decreased. This synergistic effect could improve the SERS performance of the system. Consequently, for the dye molecules CV and MeB, the detection limits reach 10−10 M and 10−9 M, respectively, while for biomolecule adenine, the detection limit is as low as 5 × 10−8 M. The results also show the good concentration-dependent linearity, uniformity, reproducibility and stability of SERS substrate. Nb2C-Au NPs could be a fast, sensitive and stable SERS platform for label-free and non-destructive detection. This work may expand the application of MXene based materials in the field of SERS.

Synergistic effect of Z-scheme and oxygen vacancy of CeO2/WO3 heterojunction for enhanced CO2 reduction activity

Photocatalytic CO2 reduction shows great prospects in producing clean energy and solving environmental pollution. However, the activity of traditional photocatalysts is confined by poor carrier separation. In this paper, cerium oxide (CeO2) and tungsten oxide (WO3) were combined by an electrostatic self-assembly method to form a CeO2/WO3 Z-scheme heterojunction for photocatalytic CO2 reduction. With the active combination, it is discovered that Z-scheme provided an interfacial free charge carrier and the availability of oxygen vacancies offered active sites, which ultimately increased the CO2 photoconversion activity 30.1 µmol·g−1·h−1 into CO by the CeO2/WO3 composite, much higher than that of pristine CeO2. Furthermore, the enhanced light absorption and a low defective surface contributed to the enriched interfacial conversion efficiency upon heterojunction formation. The urbach energy tail (Eu) of the composite offered the slow charge recombination rate that enhanced CO2 reduction. This paper offered an idea for constructing synergistic interfacial interaction in Z-scheme heterostructure for enhancing the activity of CO2 reduction.