Higher Photocurrent Density Research Articles

Exploiting the efficiency of narrow band gap S-doped g-C3N4/Expanded Perlite/Red Ocher nanocomposite for high-level eliminating halogenated dye in Cool‐White‐SMD/H2O2 system

Hitherto, constructing prominent visible-light-driven g-C3N4/soil composites still suffers from several intricacies, including low specific surface area, inadequate charge separation, and a high band gap energy (Eg >2.7 eV). To address these drawbacks, sulfur atoms were introduced into g-C3N4 (S-doped g-C3N4 or SCN); thereby, Red Ocher (RO) and Expanded Perlite (EP) were grafted to SCN, which the engineered SCN/10EP/20RO nanocomposite divulged a higher specific surface area, further light-harvesting capability, narrower Eg, prolonged charge recombination process, lower the charge transfer resistance, and higher photocurrent density than bulk g-C3N4 (CN). Additionally, the formed S-scheme charge migration mechanism and the hole-trapping role of the hydroxyl functional groups synergistically engendered robust visible-light-driven catalytic performances under visible-light exposure. By enabling the heterogeneous photo-Fenton-like process, the Methylene Blue removal efficiency (MBRE) and the Total Organic Carbon (TOC) decontamination promptly elevated to 99.6% and 87.7% within 90 min under Cool-White-SMD/H2O2 condition, respectively. Manifestly, the kinetic reaction rate of the photo-Fenton-like process was 7.5 times higher than the primary photocatalysis, showcasing HO•had a determining role towards decent decomposing MB. After overviewing, our detailed findings straightforwardly corroborated that SCN/10EP/20RO nanocomposite would be an efficient, long-lasting, and green photocatalyst for eradicating halogenated organic pollution.

CuO nanoparticles for enhanced photoelectrochemical HER activity

Cupric oxide nanoparticles are a p-type semiconductor that can be used as a hole transport layer material in perovskite solar cells owing to their high electrical conductivity and stability. In the present work, CuO nanoparticles are synthesized using the hydrothermal technique, and their photoelectrochemical properties are studied through cyclic voltammetry. The X-ray diffraction patterns of the nanoparticles were analyzed for phase formation, revealing the monoclinic phase and further verified by the Rietveld Refinement. Thermogravimetric analysis shows a total weight loss of 13.47%. Transmission electron microscopy analysis suggests the formation of nanoparticles with an average size of 34 nm. The selected area electron diffraction analysis reveals the crystalline structure of the nanoparticles. The absorbance spectra of the nanoparticles were analyzed by UV–visible measurement, and Tauc's relation was used to estimate the optical bandgap. The XPS results align with the XRD results, indicating the formation of pure CuO nanoparticles. The developed catalyst's photoelectrochemical performance was investigated in the neutral solution for the hydrogen evolution reaction activity, and a high photocurrent density of −41.57 mA/cm2 was observed versus −0.6 V vs. RHE.

Green light all the way: Triple modification synergistic modification effect to enhance the photoelectrochemical water oxidation performance of BiVO4 photoanode

The recombination of photogenerated electron-hole pairs of the photoanode seriously impairs the application of bismuth vanadate (BiVO4) in photoelectrochemical water splitting. To address this issue, we prepared a Yb:BiVO4/Co3O4/FeOOH composite photoanode by employing drop-casting and soaking methods to attach Co3O4/FeOOH cocatalysts to the surface of ytterbium-doped BiVO4. The prepared Yb:BiVO4/Co3O4/FeOOH photoanode demonstrates a high photocurrent density of 4.89 mA cm−2 at 1.23 V versus the reversible hydrogen electrode (RHE), which is 5.1 times that of bare BiVO4 (0.95 mA cm−2). Detailed characterization and testing demonstrated that Yb doping narrows the band gap and significantly enhances the carrier density. Furthermore, Co3O4 serves as a hole transfer layer to expedite hole migration and diminish recombination, while FeOOH offers additional active sites and minimizes surface trap states, thus boosting stability. The synergistic effects of Yb doping and Co3O4/FeOOH cocatalyst significantly improved the reaction kinetics and overall performance of PEC water oxidation. This work provides a strategy for designing efficient photoanodes for PEC water oxidation.

Boosting Acidic Water Oxidation on Hematite Photoanodes with Synergistic Effects of Ce‐Doped Co3O4 Nanoparticles

AbstractPhotoelectrochemical (PEC) water splitting is pivotal for addressing the clean and renewable energy demands. However, developing low‐cost, efficient, and robust non‐precious metal catalysts for the acidic oxygen evolution reaction (OER) remains a significant challenge. In this study, we introduced Ce to modulate the electronic structure of Co3O4, enhancing the stability of Co3O4 without compromising its activity. Ce‐doped Co3O4 nanoparticles were electrodeposited onto Ti‐doped hematite surfaces (Ce : Co3O4/Fe2O3), significantly enhancing the PEC performance for water splitting under acidic conditions. These catalysts achieved high photocurrent densities and exhibited prolonged stability. Functioning as p‐type semiconductors, the Ce : Co3O4 nanoparticles not only boosted light absorption but also formed a p‐n heterojunction with the Ti‐doped hematite. This heterojunction generated a built‐in electric field that facilitated the separation and transfer of photogenerated carriers, thereby improving charge separation efficiency. Additionally, these nanoparticles expanded the active surface area of hematite and served as a co‐catalyst, markedly accelerating the OER kinetics. The Ce : Co3O4/Fe2O3 photoanode achieved an impressive photocurrent density of 1.08 mA cm−2 at 1.23 VRHE in acidic media, demonstrating its enhanced activity and stability.

BaTaO2N and quantum dots-based CuO nanocomposites for HER by solar electrochemical water splitting

Barium tantalum oxynitride (BaTaO2N) has been demonstrated to be an attractive catalyst for photo-electrochemical water splitting, especially oxygen evolution reactions. However, the hydrogen production rates and charge transfer resistances of BTN leave much to be desired from a practical standpoint. In fact, it has never been reported for photocathode applications. On the other hand, CuO has been reported for hydrogen evolution reactions. Given this, here nanocomposites of BaTaO2N and copper oxide quantum dots (CuO QDs), where the latter are digestively ripened, are reported for photoelectrochemical water splitting on a carbon paper substrate. To assess the role of ultra-small quantum dots, composites of commercially available CuO nanoparticles with BaTaO2N were also tested. BaTaO2N and CuO QD nanocomposites performed well and showed a high photocurrent density of 3.1 mA cm−2 at 0 V vs RHE. This was also accompanied by reduced charge transfer resistance (225.4 Ω) due to the high interfacial surface area provided by nanoscopic CuO on BaTaO2N.

Facile synthesis of Ag2S cocatalyst modified Zn0·6Cd0·4S for efficient photocatalytic hydrogen production

The investigation and development of straightforward methods for fabricating efficient photocatalysts are critical for converting solar energy to fuel. This study reports the successful synthesis of Ag2S/Zn0·6Cd0·4S (AZC) composites featuring zinc vacancies using a simple, two-step hydrothermal approach. These composites, characterized by nanoparticle morphologies, demonstrated strong visible light absorption, high photocurrent density and exceptional charge-transfer efficiency. Notably, the 0.5% AZC composite showcased outstanding hydrogen production (18.77 mmol g−1 h−1) and stability, achieving an apparent quantum yield (AQY) of 23.8%. The remarkable photocatalytic activity of this composite is attributed to the inclusion of Ag2S serving as an electron trapping cocatalyst, and the presence of zinc vacancies. Furthermore, the study elucidates the underlying photocatalytic mechanism of the 0.5% AZC composite.

Titanium-coated high-density Fe2O3 single crystal nanowire array for solar water splitting

Fe2O3 holds promising n-type semiconductor material in the field of solar water splitting due to its excellent photocatalytic properties. However, the photoelectrochemical performance of Fe2O3 is limited by its inherent properties such as poor conductivity, and charge separation efficiency owing to its recombination rate. Therefore, researchers are more focused on nanostructuring, doping, and surface coating to overcome these issues of Fe2O3. In this study, we have investigated a low-cost way to fabricate a Ti coating layer on a high-density Fe2O3 single-crystal nanowire array for solar water splitting. Firstly, we have prepared a high-density single-crystal Fe2O3 nanowire array at lower temperatures by a new approach stress-induced atomic diffusion method. Thereafter, the prepared nanowire array was coated by Ti film using RF sputtering. The optimal film thickness of 13 nm titanium coatings layer into Fe2O3 single crystal nanowire array exhibited a high photocurrent density of 1.36 mA/cm2 at 1.23 V versus RHE and solar to hydrogen conversion efficiency (STH) of 1.67%, which could be resulting from adjusted optoelectronic properties of the nanowires.

Synergistic effect between ohmic contacts and localized surface plasmon resonance for enhancing CO2 photoreduction of BiOBr

The fast recombination rate of photogenerated carrier and short electron lifetime are the main factors affecting the CO2 reduction performance of BiOBr (BOB). The utilization of ohmic contacts and the localised surface plasmon resonance (LSPR) effect of metals can effectively solve the above problems. However, one mean alone is not ideal for improving the photocatalytic performance of BOB. Therefore, in this work, we reduced the metal Bi to the surface of BOB in an attempt to form a synergistic effect of ohmic contact and LSPR effect. DFT calculations confirm the ohmic contact between Bi and BOB. Meanwhile, electrochemical tests show that Bi/BOB-2 has a higher photocurrent density (1.1 μA/cm2), suggesting that the ohmic contact achieves ultrafast electron transfer from BOB to Bi under light. While the UV–Vis diffuse reflectance spectroscopy results show resonance absorption peaks from the LSPR effect of Bi, the TRPL results show that Bi/BOB-2 has a longer τave (3.05 ns), implying that longer-lived hot electrons are generated on the Bi surface. The synergistic effect of the two contributes to the efficient CO2 to CO transition on the catalyst surface. As a result, Bi/BOB-2 exhibites a 4.37-fold higher CO generation rate (11.45 μmolg-1 h−1) than that of pure BOB (2.62 μmolg-1 h−1) under light. This study provides a new blueprint for the design of BiOBr-based materials for efficient photocatalytic reduction of CO2.

Improvement of photoelectrochemical water splitting performance using photoanodes based on reduced graphene oxide and ZnO nanotubes

Increasing the visible light efficiency, effective charge separation, and reducing the rate of charge recombination are essential factors in improving the performance of photoelectrochemical (PEC) water splitting. To enforce these, herein zinc oxide nanotube arrays hybridized with reduced graphene oxide (rGO/ZnO NTs) are synthesized on the fluorine-doped tin oxide substrates by using an electrodeposition technique for surveying PEC water splitting efficiency under visible light. The synthesized photoanodes were characterized by field emission scanning electron microscope, energy-dispersive X-ray spectroscopy, X-ray diffraction, and UV–visible absorption spectroscopy. The linear sweep voltammetry, electrochemical impedance spectroscopy, and Mott-Schottky analysis were used to evaluate the PEC performance. The rGO/ZnO NT photoanode shows a high photocurrent density of 0.441 mA/cm2 at 1.8 V vs. RHE compared to other samples. The improved PEC performance of rGO/ZnO NTs is attributed to the prominent role of rGO in more efficient charge separation, band gap reduction, and charge recombination.

Construction of 2D/2D protonated g-C3N4/BiOBr heterojunction composite with high photocatalytic degradation performance

In this study, protonated g-C3N4 nanosheets (PCNS) were firstly synthesized through the thermal polymerization of melamine, thermal exfoliating of g-C3N4, and the protonating of g-C3N4 nanosheets. Then, 2D/2D g-C3N4/BiOBr heterojunction composites (PCNSB-X, X = 10, 20, 30, 50, 70, representing the mass percent of PCNS in the composites) were constructed by the in-situ growth of BiOBr nanosheets on the surface of PCNS. PCNSB-X composites showed enhanced light absorption, reduced recombination rate of photogenerated electron-hole pairs, higher photocurrent density and decreased impedance. Their photocatalytic activities toward degrading Rhodamine B (RhB) aqueous solution showed a trend of gradually increasing and then decreasing with the increase of g-C3N4 nanosheet dosage. The optimum photocatalytic performance was achieved by PCNSB-50, who (0.05 g) degraded 98.8% of RhB molecules (100 mL, 20 mg/L) after 60 min of visible light irradiation. Its reaction rate constant (k=0.0717 min−1) was 7.03 and 2.82 times that of pure g-C3N4 nanosheets and pure BiOBr nanosheets, respectively. g-C3N4/BiOBr composites also exhibited excellent recyclability and stability for degrading RhB. This work provides a feasible method for synthesizing g-C3N4/BiOBr composites with excellent photocatalytic performance.

Temperature effect on n-Si/Fe/NiFe photoanodes for the high-efficiency PEC water splitting

Sunlight-driven photoelectrochemical cell (PEC) can utilize water for high-efficiency artificial photosynthesis to produce low-cost green hydrogen fuel. It is crucial to explore the factors affecting the efficiency of PEC water splitting. The ambient temperature of the electrode is yet an important factor that influences PEC performance. Here, n-Si/Fe/NiFe composite photoanodes prepared by electrodeposition exhibited a low onset potential of 0.87 V and a high photocurrent density of 29.70 mA cm−2 (1.23 V vs. RHE) at room temperature, which is superior to those of n-Si/Fe and n-Si/NiFe. The influence of the temperature on the photoelectrochemical properties of n-Si/NiFe was systematically investigated. As the temperature increased, the photocurrent density of n-Si/Fe/NiFe decreased gradually and the oxidation reaction slowed down. Further experiments showed that raising the temperature helps to reduce the interfacial charge transfer resistance, increase the redox potential and carrier density. However, increasing the temperature also increases the recombination rate of photo generated carriers, reduces the carrier lifetime, and thus lowers the performance of PEC. Therefore, adjusting the ambient temperature is a potential method to improve the photoelectrochemical performance of silicon-based photoanodes.

Ideal Structures of Isolated BiVO4 Nanoparticles on WO3 Nanocorals to Enhance Photoelectrochemical Hydrogen Evolution

Metal oxide nanoparticles (NPs) of n-type semiconductors have recently garnered significant attention in the photoelectrochemical (PEC) field. In this study, isolated BiVO4 NPs on anodized WO3 nanocorals are investigated with respect to the formation mechanism of the NPs and the correlation between particle size and PEC efficiency. The sizes and distances of the BiVO4 NPs on the WO3 nanocorals are controlled via spin-coating and heat-treatment. The optimized BiVO4 NPs, with ideal sizes of 10 nm and distances of 100 nm between them, exhibit satisfactory electron and hole diffusion lengths, suppressing electron–hole recombination and promoting the exposure of WO3 to ultraviolet light. Furthermore, high-quality BiVO4, without the formation of by-products due to the optimized concentrations of Bi and V in the precursor solution, results in a 2.3-fold higher photocurrent density and H2 production, and a 6-fold higher incident photon-to-current conversion efficiency (IPCE) compared to those of pristine WO3 nanocorals.

Dissolution-Induced Surface Reconstruction of Ni0.95Pt0.05Si/p-Si Photocathode for Efficient Photoelectrochemical H2 Production.

Metal silicide/Si photoelectrodes have demonstrated significant potential for application in photoelectrochemical (PEC) water splitting to produce H2. To achieve an efficient and economical hydrogen evolution reaction (HER), a paramount consideration lies in attaining exceptional catalytic activity on the metal silicide surface with minimal use of noble metals. Here, this study presents the design and construction of a novel Ni0.95Pt0.05Si/p-Si photocathode. Dopant segregation is used to achieve a Schottky barrier height as high as 1.0eV and a high photovoltage of 420mV. To achieve superior electrocatalytic activity for HER, a dissolution-induced surface reconstruction (SR) strategy is proposed to in situ convert surface Ni0.95Pt0.05Si to highly active Pt2Si. The resulting SR Ni0.95Pt0.05Si/p-Si photocathode exhibits excellent HER performance with an onset potential of 0.45V (vs RHE) and a high maximum photocurrent density of 40.5mAcm-2 and a remarkable applied bias photon-to-current efficiency (ABPE) of 5.3% under simulated AM 1.5 (100mWcm-2) illumination. The anti-corrosion silicide layer effectively protects Si, ensuring excellent stability of the SR Ni0.95Pt0.05Si/p-Si photoelectrode. This study highlights the potential for achieving efficient PEC HER using bimetallic silicide/Si photocathodes with reduced Pt consumption, offering an auspicious perspective for the cost-effective conversion of solar energy to chemical energy.

Regulation of electron delocalization between flower-like (Co, Ni)-MOF array and WO3/W photoanode for effective photoelectrochemical water splitting

A stable heterometallic (Co, Ni)-MOF array with a 3D hierarchical flower-like morphology was coated onto the coral-like WO3/W thin film. The optimal (Co, Ni)-MOF/WO3/W photoanode exhibits a high photocurrent density of 2.96 mA cm−2 at 1.23 V in the 0.5 M Na2SO4 solution and the photoelectrochemical (PEC) cell displays an excellent solar-to-hydrogen (STH) efficiency (2.17 %) under AM 1.5 G solar light. Moreover, the separation behavior and spatial distribution of photogenerated charges have been demonstrated by photo-assisted Kelvin probe force microscopy (KPFM). Furthermore, the shift of the d-band center and the change of Gibbs free energy for oxygen evolution reaction (OER) are realized by density functional theory (DFT) calculations. Overall, the coupling effect of these ions of Co2+, O2−, Ni2+, and W6+ could result in an electron delocalization in the (Co, Ni)-MOF/WO3/W photoanode, boosting the OER activity and finally improving the PEC water splitting performance.

Unveiling the effect of the structural transformation of CoZn-MOF on BiVO4 photoanode for efficient photoelectrochemical water oxidation

Photoelectrochemical (PEC) water splitting has been widely investigated for solar-to-hydrogen conversion. However, issues like high charge recombination rate and slow surface water oxidation kinetics severely hinder its (PEC) conversion efficiency. Herein, we constructed MOF-derived CoOOH cocatalyst on BiVO4 photoanode, using a feasible electrochemical activation strategy. The BiVO4-based photoanode obtained shows a high photocurrent density of 3.15 mA/cm2 at 1.23 VRHE and low onset potential. Detailed experiments and theoretical calculations show that during the activation of CoZn-MOFs, there was a partial breakage of 2-methylimidazole (mIM) linker, an increase in the oxidation state of Cobalt ion (Co), and increased O2–. The high PEC performance is mainly attributed to the MOF-derived CoOOH, which provides rich active sites for hole extraction and reduces the overpotential for oxygen evolution reaction. Furthermore, when CoZnNiFe-LDHs were decorated on BiVO4 using the ions exchange method, the photocurrent density of BiVO4/CoZnNiFe-LDHs photoanode got to 4.0 mA/cm2 at 1.23 VRHE, accompanied with high stability. This study provides insights into understanding the key role played by the structural transformation of MOF cocatalyst in PEC water splitting processes.

In-situ electron capture by surface Co-Ci to facilitate the solar water splitting of Fe2O3

Surface co-catalyst has been widely used to improve the performance of hematite for solar water splitting. However, the specific working mechanism for co-catalyst has not yet been extensively studied, especially lacking for in-situ information. Here we report a Co-Ci/Zr-Fe2O3 (LV) photoanode for efficient water splitting and probe the working mechanism of surface Co-Ci by in-situ X-ray absorption spectroscopy (XAS) under illumination. The low vacuum treatment and the Zr-doping in Co-Ci/Zr-Fe2O3 (LV) can significantly increase the donor density and then facilitate the bulk charge transfer, while the surface Co-Ci co-catalyst can greatly reduce the electron-hole recombination and then lower the onset potential. In-situ XAS reveals that under illumination, the photon-excited electrons will be quickly transferred to the Co sites in Co-Ci, while the excited holes will be left on Fe to form the high-valence Fe4+ to enhance the oxidation capability. As a result, the combined Co-Ci/Zr-Fe2O3 (LV) photoanode shows a quick bulk charge transfer and a low surface charge recombination, leading to a high photocurrent density of 4.10 mA/cm2 (1.23 VRHE) and a low onset potential of 0.85 VRHE with good stability.

Quantum Dots Mediated Heterojunction Coupling MoSe2 Photoanode for Photoelectrochemical Water Splitting.

Graphene quantum dots (GQDs) possess the photosensitive absorption for photoelectrochemical hydrogen evolution owing to special band structures, whereas they usually confront with photo-corrosion or undesired charge recombination during photoelectrochemical reactions. Hence, we establish the heterojunction between GQDs and MoSe2 sheets via a hydrothermal process for improved stability and performance. Photoanodic water splitting with hydrogen evolution boosted by the heteroatom doped N,S-GQDs/MoSe2 heterojunction has been attained due to the abundant active sites, promoted charge separation and transfer kinetics with reduced energy barriers. Diphasic 1T and 2H MoSe2 sheet-hybridized quantum dots contribute to the Schottky heterojunction, which can play a key role in expedited carrier transport to inhibit accumulative photo-corrosion and increase photocurrent. Heteroatom dopants lead to favored energy band matching, bandgap narrowing, stronger light absorption and high photocurrent density. The external quantum efficiency of the doped heterojunction has been elevated twofold over that of the non-doped pristine heterojunction. Modification of the graphene quantum dots and MoSe2 heterojunction demonstrate a viable and adaptable platform toward photoelectrochemical hydrogen evolution processes.

Deciphering the photoelectrochemical behaviour of MoSe2-decorated BiVO4 as a dual system for concurrent degradation of methylene blue and hydrogen generation

Green hydrogen production through photoelectrochemical (PEC) water splitting offers a sustainable energy solution, but the utilization of low-quality water is essential to conserve freshwater resources. Repurposing industrial wastewater, a substantial global issue, for PEC water splitting remains underexplored due to challenges in photoelectrode efficiency and stability. In this study, we present a MoSe2-decorated BiVO4 heterostructured photoelectrode (MoSe2/BiVO4 or BM) for green hydrogen production and efficient wastewater treatment. The optimized system yields a hydrogen production rate of 0.113 mmol from synthetic textile water (utilizing methylene blue as a model pollutant) while achieving a 94.74% degradation of pollutants. Synthesized via a hydrothermal route, BM demonstrates a high photocurrent density of 2.57 mA/cm2 at 1.23 V vs RHE, surpassing BV alone (0.14 mA/cm2). Further, BM shows incident photon to current efficiency (IPCE) of 12.24% and applied bias to photocurrent efficiency (ABPE) of 0.59%. Scavenger studies elucidate the role of holes in MB degradation. Tested in textile wastewater treatment outlets, BM exhibits a hydrogen production rate of 6.155 μmoles alongside reduced COD, BOD, TOC, and microbial load, showcasing its dual capability for hydrogen generation and simultaneous wastewater treatment. Thus, the efficiently designed type-II heterostructure formed between BV and MS behaves as a dual system with demonstrated usage in low-quality water for hydrogen generation with its simultaneous treatment.

Nonstoichiometric In–S group yielding efficient carrier transfer pathway in In2S3 photoanode for solar water oxidation

AbstractThe construction of high‐efficiency photoanodes is essential for developing outstanding photoelectrochemical (PEC) water splitting cells. Furthermore, insufficient carrier transport capabilities and sluggish surface water oxidation kinetics limit its application. Using a solvothermal annealing strategy, we prepared a nonstoichiometric In–S (NS) group on the surface of an In2S3 photoanode in situ and unexpectedly formed a type II transfer path of carrier, thereby reducing the interfacial recombination and promoting the bulk separation. First‐principles calculations and comprehensive characterizations demonstrated NS group as an excellent oxygen evolution cocatalyst (OEC) that effectively facilitated carrier transport, lowered the surface overpotential, increased the surface active site, and accelerated the surface oxygen evolution reaction kinetics by precisely altering the rate‐determining steps of * to *OH and *O to *OOH. These synergistic effects remarkably enhanced the PEC performance, with a high photocurrent density of 5.02 mA cm−2 at 1.23 V versus reversible hydrogen electrode and a negative shift in the onset potential by 310 mV. This work provides a new strategy for the in situ preparation of high‐efficiency OECs and provides ideas for constructing excellent carrier transfer and transport channels.

Enhanced Photoelectric Properties of CsPbBr3 by SiO2 and TiO2 Bilayer Heterostructures.

CsPbBr3/SiO2 heterostructures were synthesized by the hydrolysis reaction of a mixture of CsPbBr3 nanocrystals (NCs) and (3-aminopropyl)triethoxysilane (APTS) in air. Compared with CsPbBr3 NCs, the CsPbBr3/SiO2 heterostructures exhibit stronger photoluminescence (PL) intensity, longer lifetime of PL (∼40.5 ns), and higher PL-quantum yield (PLQY, ∼86%). The carrier dynamics of CsPbBr3/SiO2 was detected by the transient absorption (TA) spectrum. The experimental results show that SiO2 passivates the surface traps of CsPbBr3 NCs and enhances the PL intensity. However, photoelectrochemical impedance spectra (PEIS) demonstrate that the impedance of CsPbBr3/SiO2 is higher than that of CsPbBr3 NCs, which reduces carrier transport and extraction. Because the application of CsPbBr3/SiO2 in optoelectronics is limited, CsPbBr3/SiO2/TiO2 heterostructures were synthesized by the further reaction of tetrabutyl titanate (TBT). The TiO2 coating can reduce the impedance of the CsPbBr3/SiO2. Importantly, ∼68% of the PL intensity of CsPbBr3/SiO2 is retained. Compared with CsPbBr3/SiO2 and CsPbBr3 NCs, the CsPbBr3/SiO2/TiO2 demonstrates faster carrier transport (κct = 2.4 × 109 s-1) and higher photocurrent density (J = 76 nA cm-2). In addition, CsPbBr3/SiO2/TiO2 shows good stability under (ultraviolet) UV irradiation, along with water stability and thermal stability. Therefore, the double protection approach can enhance the stability of CsPbBr3 NCs and tune the optoelectronic properties of CsPbBr3 NCs.