Dispersed Platinum Research Articles

Full utilization of lignocellulose through one-pot in-situ hydro-liquefaction with versatile Pt/CeCrO2−x catalyst

One-pot catalytic conversion of raw woody biomass into valuable chemicals and fuels is a promising strategy for relieving energy depletion. Here, we proposed an efficient catalyst combining highly dispersed and ultrafine platinum nanoparticles on ceria doped with Cr, enabling nearly complete conversion, and obtaining value-added chemicals and bio-fuel with high energy density. The key part of our approach lies on the flexible utilization of a synergetic catalysis system consisting of a redox potential CeCrO2−x, balanced acid-base properties and strong metal-support interaction. Abundant oxygen vacancies and enhanced wettability have been achieved by properly doping of Cr. Under nitrogen atmosphere, the catalyst still shows excellent conversion performance, not only can hydrogen transfer be achieved by using the “borrowed” hydrogen, but also the Guerbet reaction can suppress the formation of intractable chars. Moreover, alcoholophilicity facilitates the dispersion of the catalyst particles in ethanol, leading to higher mass transfer efficiency. The catalyst can be separated facilely and reused three times without obvious deactivation.

Nanocrystal co-existed highly dense atomically disperse Pt@3D-hierarchical porous carbon electrocatalysts for tri-iodide and oxygen reduction reactions

The fabrication of highly dense atomically dispersed platinum (Pt) on a carbon matrix increases the catalytic sites and is one of the ways to utilize Pt to make inexpensive and highly efficient electrocatalysts. We have employed a three-dimensional hierarchical porous carbon (3D-HPC) substrate and nanocrystal co-existed highly dense Pt single atoms deposited by the incipient wetness impregnation method. The special structure of the 3D-HPC substrate favors the homogeneous dispersion of Pt all over the 3D-HPC, leading to nanocrystal co-existed highly dense atomically disperse Pt@3D-HPC. The as-prepared Pt@3D-HPC shows outstanding catalytic properties towards tri-iodide and oxygen reduction reactions (ORR). The Pt@3D-HPC electrode shows lower charge transfer resistance (Rct) at the electrode/electrolyte interface with narrow peak-to-peak separation (△Epp) and higher peak current density during the tri-iodide reduction reaction (IRR). The DSSC fabricated with a Pt@3D-HPC electrode shows improved performance compared to the reference Pt counter electrode (CE). Furthermore, CV and LSV demonstrate the better catalytic activity of Pt@3D-HPC towards ORR, with higher onset potential (Eonset), half-wave potential (E1/2), and current density (j) compared to the reference 20% Pt/C electrode. Furthermore, impressive mass activity was observed by the Pt@3D-HPC catalyst compared to 20% Pt/C and other recently reported single atom-based catalysts. The Pt@3D-HPC catalyst also shows improved stability towards IRR and ORR. This simple strategy to fabricate nanocrystal co-existed highly disperse Pt@3D-HPC catalysts with outstanding electrocatalytic performance and stability paves the way for its practical application and provides insights into a new approach to the design of electrocatalysts applicable to energy-related devices.

Titanium dioxide hierarchical microspheres decorated with atomically dispersed platinum as an efficient photocatalyst for hydrogen evolution

Micromorphology engineering and co-catalyst construction are considered as feasible approaches to boost the photocatalytic hydrogen evolution performance. Herein, we combined two approaches to construct a new photocatalyst with titanium dioxide (TiO2) hierarchical microspheres (HMSs) as support and atomically dispersed platinum (Pt) species as co-catalyst (donated as TiO2 HMSs@xPt). The as-prepared TiO2 HMSs@xPt photocatalysts exhibited combined advantages including adequate light harvesting, improved charge-carrier separation and transport, abundant active sites, and reduced Pt consumption, which are favorable for photocatalytic hydrogen evolution. Specifically, the optimized TiO2 HMSs@0.36Pt exhibits a remarkable photocatalytic hydrogen evolution rate of 11.7 mmol g-1h−1 under simulated AM 1.5G solar light irradiation, which is 50 times and 4.8 times higher than those of pure TiO2 HMSs and traditional anatase TiO2 nanoparticles (NPs) with the same Pt loading, respectively.

Synthesis of layered double hydroxide-supported platinum nanocatalyst for highly efficient and selective hydrogenation of nitroaromatics

In this work, highly dispersed platinum nanoclusters (or single atoms) supported on layered double hydroxides (Pt/FeNi-LDHs, Pt/FeCo-LDHs, Pt/CoNi-LDHs) are synthesized. The as-prepared catalysts are used for the selective hydrogenation of nitroaromatics, the catalysts showed high activity, selectivity and stability. The as-synthesized catalysts are characterized by thermal-gravity (TG), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), high resolution TEM (HRTEM), scanning TEM (STEM), STEM-EDS elemental analysis and inductively coupled plasma emission spectroscopy (ICP-OES) methods, which prove that the Pt species are highly dispersed on the support. Take p-nitroacetophenone reduction as an example, the 0.4%Pt/FeNi-LDHs catalyst also shows excellent catalytic performance (conversion = 98.2%, turnover frequency (TOF) = 1100.5 h−1) and high selectivity to p-aminoacetophenone (93.8%) among these as-prepared catalysts even at low temperature (60 °C). Its excellent performance is probably due to the uniform distribution of the platinum species and the interaction of Pt–FeNi-LDHs conducive to the selective hydrogenation of –NO2 groups.

Mechano-thermal milling synthesis of atomically dispersed platinum with spin polarization induced by cobalt atoms towards enhanced oxygen reduction reaction

Tuning the local spin configurations of single-atom electrocatalysts holds enormous promise in boosting the oxygen reduction reaction (ORR), but still fills with challenging of lacking efficient means. Herein, a binary-atom catalyst (PtCo-NC) consisting of atomically dispersed Pt and Co on nitrogen doped carbon is rationally designed and synthesized by a mechano-thermal milling method. Theoretical calculations reveal that the introduction of atomically dispersed Co results in spin polarization of adjacent Pt atoms, which optimizes the absorption energy and lowers the energy barrier of the rate-determining step, thus accelerating oxygen catalyzed reaction kinetics for PtCo-NC. As a consequence, the constructed PtCo-NC possesses an outstanding ORR performance with a positive half-wave potential (0.85 V), large kinetic current density (83.3 mA cm−2 at 0.8 V), low Tafel slope (85 mV dec−1) and robust cyclic stability (more than 90% retention after 170 h in alkaline media). As the cathodic catalyst, the zinc-air battery driven by PtCo-NC delivers the maximum power density (204 mW cm−2), excellent rate capacity and remarkable durability. The present work may provide new insight into boosting oxygen reduction reaction activity, leading the exploration toward highly efficient catalysts for renewable energy storage and conversion systems.

One-step preparation of polyaniline-modified three-dimensional multilayer graphene supported PtFeOx for methanol oxidation

In this paper, RGO/PANI/Pt@FeOx with a three-dimensional multilayer structure is successfully prepared by the one-pot method, in which the introduction of PANI prevents GO from agglomerating, and also plays a crucial supporting role in the three-dimensional multilayer structure. SEM and TEM images confirm that the catalyst has a three-dimensional multilayer structure, and Pt nanoparticles are uniformly dispersed on the surface of PANI/RGO, with an average particle size of 3.2 nm. The electrochemical evaluation clearly shows that the mass activity of 3D multilayer RGO/PANI/Pt@FeOx (1.573 Amg−1Pt) is three times than that of Pt/C. After 3600 s, it retained mass activity is seven times than that of Pt/C. In addition, 3D multilayer RGO/PANI/Pt@FeOx catalyst has better CO tolerance than Pt-RGO/PANI, Pt/C and Pt-RGO. These results mainly originate from that the three-dimensional multilayer structure provides a larger specific surface area, N species in PANI can be conducive to the uniform dispersion of platinum, and the existence of FeOx improves the catalytic efficiency of Pt and the rate of water splitting due to bi-functional mechanism, consequently enhancing the CO tolerance of catalyst. Thereby, 3D multilayer RGO/PANI/Pt@FeOx can be utilized as a promising methanol oxidation catalyst.

Enhanced performance of Pt-based diesel oxidation catalyst via defective MnOx: The role of Pt/MnOx interface

To strengthen the interface effect of Pt with MnOx, manganese oxides with different defective concentration were obtained via removing oxygen under reduction treatment. The excellent performance on the Pt-based oxidation catalyst with optimum reduction temperature is 250 °C, and it's the light-off temperature of CO, C3H6 and NO are 170 °C, 180 °C and 185 °C, respectively, and the highest NO maximum conversion of 76%. The defect on MnOx could induce the adsorption of Pt2+ to produce the higher platinum dispersion and more active oxygen species. The abundant oxygen vacancies on manganese manganite would transfer to the subsurface, reducing the Mn valence and affecting the electronic effect of Pt with MnOx. Meanwhile, the existence of interfacial structure induces the shrinkage of platinum cell with the reduction of lattice parameter, because of the doping of Mn ion. The strong interaction of Pt with MnOx could promote the reduction of manganese oxides at the lower temperature. The interface of Pt-MnOx could accelerate the oxygen mobility and facilitate the formation of more bridged nitrates and chelating nitrates. Due to the interfacial structure of Pt with MnOx, the low temperature catalytic performance and high NO conversion of catalyst are remarkably improved.

Elucidating the Formation and Structural Evolution of Platinum Single-Site Catalysts for the Hydrogen Evolution Reaction.

Platinum single-site catalysts (SSCs) are a promising technology for the production of hydrogen from clean energy sources. They have high activity and maximal platinum-atom utilization. However, the bonding environment of platinum during operation is poorly understood. In this work, we present a mechanistic study of platinum SSCs using operando, synchrotron-X-ray absorption spectroscopy. We synthesize an atomically dispersed platinum complex with aniline and chloride ligands onto graphene and characterize it with ex-situ electron microscopy, X-ray diffractometry, X-ray photoelectron spectroscopy, X-ray absorption near-edge structure spectroscopy (XANES), and extended X-ray absorption fine structure spectroscopy (EXAFS). Then, by operando EXAFS and XANES, we show that as a negatively biased potential is applied, the Pt–N bonds break first followed by the Pt–Cl bonds. The platinum is reduced from platinum(II) to metallic platinum(0) by the onset of the hydrogen-evolution reaction at 0 V. Furthermore, we observe an increase in Pt–Pt bonding, indicating the formation of platinum agglomerates. Together, these results indicate that while aniline is used to prepare platinum SSCs, the single-site complexes are decomposed and platinum agglomerates at operating potentials. This work is an important contribution to the understanding of the evolution of bonding environment in SSCs and provides some molecular insights into how platinum agglomeration causes the deactivation of SSCs over time.

Experimental Comparison of Hydrogen Peroxide Catalysts for a Hydrogen -Decane Bipropellant Combustor

This paper presents an experimental comparison of the catalytic activity of different alumina-based catalysts for highly concentrated hydrogen peroxide (85% w.) decomposition. Three pellet-shaped catalysts with manganese oxide or platinum active phases were considered. Their performances were investigated by measuring the temperature increase in the catalytic bed after several injections of of hydrogen peroxide in a constant-volume chamber. This setup evidenced a loss of reactivity after several injections, which was due to water poisoning. Pellets were, then, tested in a small-scale catalytic chamber plugged into a combustor. Hydrogen peroxide was injected at various mass flow rates (from 4.5 to ) through the catalytic chamber. The temperature evolution at the exhaust was recorded via a thin thermocouple (1 mm) and used to compare the activity of the different catalysts. The specific surface area, the active phase amount, and the platinum dispersion were measured after the tests. Catalysts experienced a decrease of those values, evidencing the ageing of the catalytic material. Preliminary combustion tests were performed for all catalysts in a hydrogen bipropellant combustor. Results were compared to evaluate the influence of the efficiency of the catalytic system on combustion performance.

Single-atom Pt-anchored Zn0.5Cd0.5S boosted photoelectrochemical immunoassay of prostate-specific antigen

Photoelectrochemical immunoassays/immunosensors have been employed for biomarker detection, but most are lack of high-efficiency photo-electron transfer nanomaterials for widespread utilization. Herein we synthesized single-atom platinum-anchored Zn0.5Cd0.5S nanostructures to construct an innovative photoelectrochemical (PEC) immunosensor for photocurrent determination of prostate-specific antigen (PSA). Improvement of the photocurrent on the sensing interface derived from the ion-exchange reaction between cupric oxide nanoparticle (CuO NP)-labeled secondary antibody and single-atom platinum-anchored Zn0.5Cd0.5S. The experimental results showed that the doping of zinc ions and atomically dispersed platinum into CdS could significantly enhance the photocurrent, which further improved the sensitivity of immunoassay. Specifically, upon sensing the target PSA, a CuO-labeled detection antibody was introduced by sandwich immunoreaction and numerous copper ions (Cu2+) were released from CuO by acid to participate in the ion-exchange reaction. Thereafter, the ion-exchange reaction between Cu2+ ions and single-atom platinum-anchored Zn0.5Cd0.5S resulted in the quenching of the photocurrent from single-atom platinum-anchored Zn0.5Cd0.5S owing to weak photoactive material CuxS formation. Under optimized conditions, single-atom platinum-anchored Zn0.5Cd0.5S-based photoelectrochemical immunoassay gave good PEC signals toward PSA from 1.0 to 10000 pg/mL with a limit of detection of 0.22 pg/mL. Additionally, good repeatability, intermediate precision, strong anti-interference and high accuracy (relative to commercialized ELISA kit) for the measurement of human serum specimens were acquired. Importantly, use of single-atom platinum-anchored Zn0.5Cd0.5S can provide an important idea for early tumor screening and diagnosis.

Platinum Nanoparticles Uniformly Dispersed on Covalent Organic Framework Supports for Selective Synthesis of Secondary Amines

AbstractCovalent organic frameworks (COFs) with pore structures are talented supports for active components. In this report, COF has been rationally fabricated and served as host for growing uniformly dispersed platinum nanoparticles with a narrow size distribution (2 nm). The obtained hybrid Pt/COF exhibits high catalytic activity in the reductive amination of benzaldehyde towards secondary amines with a yield of 96 % and good recyclability. The preferable selectivity towards secondary amines could be attributed to synergistic effects of active platinum nanoparticles and COF, in which metallic Pt nanoparticles were uniformly dispersed with a positively charged surface. This work will open an avenue towards controlling the interaction between active metals and support as well as rational design of catalysts for demanding transformations for fine agrochemicals intermediates.

Solid-State Dispersions of Platinum in the SnO2 and Fe2O3 Nanomaterials.

The dispersion of platinum (Pt) on metal oxide supports is important for catalytic and gas sensing applications. In this work, we used mechanochemical dispersion and compatible Fe(II) acetate, Sn(II) acetate and Pt(II) acetylacetonate powders to better disperse Pt in Fe2O3 and SnO2. The dispersion of platinum in SnO2 is significantly different from the dispersion of Pt over Fe2O3. Electron microscopy has shown that the elements Sn, O and Pt are homogeneously dispersed in α-SnO2 (cassiterite), indicating the formation of a (Pt,Sn)O2 solid solution. In contrast, platinum is dispersed in α-Fe2O3 (hematite) mainly in the form of isolated Pt nanoparticles despite the oxidative conditions during annealing. The size of the dispersed Pt nanoparticles over α-Fe2O3 can be controlled by changing the experimental conditions and is set to 2.2, 1.2 and 0.8 nm. The rather different Pt dispersion in α-SnO2 and α-Fe2O3 is due to the fact that Pt4+ can be stabilized in the α-SnO2 structure by replacing Sn4+ with Pt4+ in the crystal lattice, while the substitution of Fe3+ with Pt4+ is unfavorable and Pt4+ is mainly expelled from the lattice at the surface of α-Fe2O3 to form isolated platinum nanoparticles.

Synthesis of atomic platinum with high loading on metal-organic sulfide

Synthesis of ultrafine noble metal with sizes down to nanoscale and even atomic scale is of great significance for heterogeneous catalysis. However, the metal loading is usually kept below 2 wt% due to the aggregation tendency at higher metal contents. Herein, by mimicking the multicentered metal sulfur cluster of metalloenzyme, a bioinspired synthesis of isolated noble metal atoms on the metal-organic sulfide (MOS) framework was reported. The sulfur-rich framework featuring [Mo3S7Br6]2− cluster as the building block and dithiol as the linking node was constructed via chemical bonding and employed to support atomic metal species. Remarkably, highly dispersed platinum atoms with a loading amount as high as 18.5 wt% on the underlying sulfur-rich framework could be obtained after reduction. By increasing the number of benzene rings in the dithiol, the pore size and even the wettability of the MOS frameworks could be modulated. The general applicability of the synthesis could also be extended to the synthesis of atomic Pd. Furthermore, the Pt-loaded MOS could serve as the catalyst for selective hydrogenation of phenylacetylene to styrene in both organic solvent and pure water. Density function theory calculation demonstrated that the atomic Pt sites in the sulfur-rich coordination environment could activate H2 molecules and chemoselectively catalyze the semi-hydrogenation of phenylacetylene to styrene through moderately low energy barriers. The metalation of such a versatile MOS framework will shed light on the synthesis of bioinspired catalytic materials with well-defined structures for more diverse applications.

Effects of Mg, Ca and K addition on Pt-Sn/γ-Al2O3 for propane dehydrogenation

Abstract: In the present study, the applicability of a bimetallic Pt-Sn/Al2O3 in propane dehydrogenation with different promoters, namely, Ca, Mg, incorporation of Mg-K and Ca-K was studied. The catalysts were prepared by the sequential impregnation of γ-alumina support and characterized by TPD, SEM, XRD and UV analysis. The propane conversion and propylene selectivity were evaluated under the representative industrial conditions. The results showed that the Pt-Sn-Mg-K/γ-Al2O3 catalyst had a better performance in terms of propane conversion and propylene selectivity and yield, due to the partially neutralize and synergistic effect of Mg and K (probably by increasing the platinum dispersion and preventing side reaction and coke formation). TPD results also showed the effects of all these promoters (Ca, Mg , Ca-K and Mg-K) on reduction of acidic sites of catalyst, which are favorable sites for cracking reaction and coke formation. In the meantime, Ca is more effective on reducing strong acidic sites, but also Mg is more effective on reducing weak and medium strength acid sites. Therefore, alkaline-earth metals and also using them with potassium could reduce side reaction products and lead to more selective reaction to propylene, and improve catalyst performance compared to industrial catalyst.

A Theory-Guided X-ray Absorption Spectroscopy Approach for Identifying Active Sites in Atomically Dispersed Transition-Metal Catalysts.

Atomically dispersed supported metal catalysts offer new properties and the benefits of maximized metal accessibility and utilization. The characterization of these materials, however, remains challenging. Using atomically dispersed platinum supported on crystalline MgO (chosen for its well-defined bonding sites) as a prototypical example, we demonstrate how systematic density functional theory calculations for assessing all the potentially stable platinum sites, combined with automated analysis of extended X-ray absorption fine structure (EXAFS) spectra, leads to unbiased identification of isolated, surface-enveloped platinum cations as the catalytic species for CO oxidation. The catalyst has been characterized by atomic-resolution imaging and EXAFS and high-energy resolution fluorescence detection X-ray absorption near edge spectroscopy. The proposed platinum sites are in agreement with experiment. This theory-guided workflow leads to rigorously determined structural models and provides a more detailed picture of the structure of the catalytically active site than what is currently possible with conventional EXAFS analyses. As this approach is efficient and agnostic to the metal, support, and catalytic reaction, we posit that it will be of broad interest to the materials characterization and catalysis communities.

5-Hydroxymethylfurfural Oxidation Over Platinum Supported on Açaí Seed Coal for Synthesis of 2,5-Furandicarboxylic Acid

2,5-furandicarboxylic acid (FDCA) is produced from the selective oxidation of 5-hydroxymethylfurfural (HMF) and is an important platform molecule applied in the pharmaceutical and petrochemical industries. Activated carbons produced from renewable resources are useful materials due to their physicochemical properties, defined mainly by the oxygenated functional groups on their surface. This work studies the oxidation of HMF to FDCA over Pt catalysts supported on açaí coal. The catalysts were characterized by N2 adsorption, XPS, ToF-SIMS, FTIR, XRD, Raman, TEM, SEM, TPR-H2, and TGA/DTA. The conversion of HMF to FDCA in an alkaline medium occurred via hydroxymethyl-2-furancarboxylic acid (HMFCA), which was oxidized to 5-formylfurancarboxylic acid (FFCA) and FDCA. The catalytic tests showed a high conversion of HMF with a 93.6% yield of FDCA. The excellent results were attributed to the high dispersion of Pt on the support and the presence of oxygenated functional groups on the coal surface. The functional groups increased the interaction between Pt-HMF and Pt-furan intermediates and favored a higher dispersion of platinum (53.3%) due to an anchoring effect.

Novel Dyadic Amorphous-Crystalline Nano-Titania Hybrids for Sacrifiers-Stored Photocatalysis

Sacrifiers-promoted photocatalysis is a useful way to achieve high efficiency photoreduction and photocatalytic hydrogen production for photocatalysts of weak reductive power such as TiO2. Herein we report a new method to fabricate a unique dyadic hybrid consisting of closely compacted crystalline (anatase) and titanium glycerolate (TiG)-derived organic group-retained amorphous nanoparticles to validate adsorption-stored sacrifiers-promoted photocatalysis instead of using sacrifiers in bulk solution. It was found that ascorbic acid (AA)-modified TiG prepared at a small fraction of glycerol, characterized by peculiar cocoon/open nanocontainer-type morphologies, varieties of oxygen containing groups, and remarkably high specific surface area, is suitable for precursing such hybrids. AA can change crystallization processes and particle morphologies by terminating chain linkages in TiG structure, which increases porosity and brings about visible light responsive photocatalysis for the dyadic hybrid. Benefiting from good adsorption affinity to organic sacrifiers, the sacrifier-prestored hybrid can catalyze significantly enhanced photoreduction with good reproducibility toward dye molecules via the synergy of sacrifier enrichment and photocatalysis. AA modified TiG also exhibits good self-reducibility enabling pre-loading of highly dispersed and localized platinum nanoparticles, and the resulted dyadic hybrid facilitates photocatalytic hydrogen production of extremely higher turn-off frequency and better impurities interference-resistivity compared to the P25-based commercial catalyst.

One-Step Preparation of Nitrogen-Doped Platinum-Based Catalysts for Electrocatalytic Oxidation of Ethanol

Pt/nitrogen-doped reduced graphene oxide (N-GO) catalysts were prepared by one-step microwave-assisted ethylene glycol reduction using N-methyl-2-pyrrolidone (NMP) as the nitrogen source. Nitrogen doping in GO and the deposition of highly dispersed platinum nanoparticles were completed at the same time. The effect of adding NMP on the microstructure and the electrocatalytic performance of Pt/N-GO catalysts were studied. The results show that Pt/N-GO catalysts have better particle size distribution and electrocatalytic performance than undoped catalysts. When the ratio of GO to NMP reaches 1:200, the peak current density of the catalyst is about 3 times that of the non-nitrogen-doped Pt/GO and Pt/C(JM) catalysts, indicating that the electrocatalytic performance of this catalyst is the best. Therefore, the development of a one-step synthesis of Pt/N-GO catalysts has a broad application prospects in direct ethanol fuel cells (DEFCs).

Temperature and Reaction Environment Influence the Nature of Platinum Species Supported on Ceria

Catalytic systems based on supported noble metals are extensively studied because of their widespread application. Discussions remain about the nature of the active species, whether they are atomically dispersed or nanoparticles, and their reactivity. In this work, combining in situ/operando spectroscopy with theoretical modeling, we propose a phase diagram of atomically dispersed platinum on ceria, demonstrating that it reversibly changes from PtIVO2 to PtIIO as a function of temperature and oxygen partial pressure. The phase diagram helps identify the stability domain of each species, while spectroscopies provide a quantitative evaluation depending on the reaction conditions. Finally, our results show that high-temperature activation in the presence of steam of supported atomically dispersed platinum enhances the activity toward low-temperature carbon monoxide oxidation because it promotes aggregation into nanoparticles. This work highlights the structure–activity relationship in supported metal catalysts and proposes a suitable approach to determine the amount of each species before the investigation of the reaction mechanism.

Enhanced Efficiency of Dye-Sensitized Solar Cells Based on Polymer-Assisted Dispersion of Platinum Nanoparticles/Carbon Nanotubes Nanohybrid Films as FTO-Free Counter Electrodes.

In this study, polymer-assisted dispersants are used to stabilize the nanohybrids of platinum nanoparticles (PtNPs)/carbon nanotubes (CNTs) through non-covalent bond forces. These dispersants aim to replace the florine-doped tin oxide (FTO) glass in traditional dye-sensitized solar cells (DSSCs) as counter electrodes. The large specific surface area, high conductivity, and redox potential of PtNPs/CNT nanohybrids are used as the basis to utilize them as the counter electrode material to fabricate a dye-sensitized solar cell. The conductivity results indicate that the resistance of the PtNP/CNT nanohybrid film can be reduced to 7.25 Ω/sq. When carbon nanotubes are mixed with platinum nanoparticles at a weight ratio of 5/1, the photoelectric conversion efficiency of DSSCs can reach 6.28%. When using the FTO-containing substrate as the counter electrode, its conversion efficiency indicates that the micro-/nano-hybrid material formed by PtNPs/CNTs also exhibits an excellent photoelectric conversion efficiency (8.45%) on the traditional FTO substrate. Further, a large-area dye-sensitive cell is fabricated, showing that an 8 cm × 8 cm cell has a conversion efficiency of 7.95%. Therefore, the traditional Pt counter electrode can be replaced with a PtNP/CNT nanohybrid film, which both provides dye-sensitive cells with a high photoelectric conversion efficiency and reduces costs.