Catalytic Activity Of Co Research Articles

Influence of reduction temperature on the formation of intermetallic Pd2Ga phase and its catalytic activity in CO2 hydrogenation to methanol

AbstractThe global warming and change in climatic conditions due to rising concentration of CO2 in atmosphere are the most important challenges of 21st century. Catalytic conversion of CO2 to methanol will not only check global warming but also provide an alternative source of fuel. The phase purity of solid catalysts has a considerable influence on the desired product selectivity. Reduction temperature is one of the most important parameters responsible for catalyst phase formation. Herein, the effect of a range of reduction temperatures between 100 and 600°C on the phase composition of Pd–Ga bimetallic catalyst and CO2 hydrogenation to methanol activity was investigated. X‐ray diffraction (XRD) analysis revealed the formation of different phases at different reduction temperatures. The variation in catalyst structure was also analyzed using field emission scanning electron microscope‐energy dispersive X‐ray spectroscopy (FESEM‐EDS), Brunaue–Emmett–Teller, H2 chemisorption, and transmission electron microscopy techniques. The influence of reduction temperature, pressure (1–25 bar), H2/CO2 ratio (3–9), and reaction temperature (150–250°C) on methanol and CO selectivity from CO2 hydrogenation at atmospheric pressure was also studied. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

Degradation of substituted phenols with different oxygen sources catalyzed by Co(II) and Cu(II) phthalocyanine complexes

Research on substituted phenol degradations has received substantial attention. In this work, effective Co(II) and Cu(II) phthalocyanine complexes as catalysts were studied to degrade toxic phenols to harmless products. The effect of various process parameters, such as initial concentration of phenol, catalyst, oxygen sources, and temperature on the degradation reaction was investigated to achieve maximum degradation efficiency. The catalytic activities of Co(II) and Cu(II) phthalocyanines were evaluated for oxidation of phenolic compounds such as p-nitrophenol, o-chlorophenol, 2,3-dichlorophenol, and m-methoxyphenol. Co(II) phthalocyanine displayed good catalytic performance in degradation of 2,3-dichlorophenol to 2,3-dichlorobenzaldehyde and 2,3-dichloro-1,4-benzoquinone with the highest TON and TOF values within 3 h at 50 °C. The fate of catalyst during the degradation process was followed by UV–Vis spectroscopy.

In situ DRIFTS investigation of low temperature CO oxidation over manganese oxides supported Pd catalysts

Abstract A series of different manganese oxides supported Pd catalysts with low Pd loading of 0.3 wt.% have been synthesized and applied to CO catalytic oxidation at low-temperature. In situ DRIFTS was employed to dynamically trace CO oxidation process. It was found that the CO catalytic activity decreased in the order of Pd/OMS-2 > Pd/MnO2 > Pd/Mn2O3 >> Pd/Mn3O4. More interestingly, the Pd/OMS-2 catalyst exhibited exceptionally high activity of T99 = 16 °C, as well as higher reducibility. Furthermore, XPS and in situ DRIFTS results indicated that a substantial of lattice oxygen participated in CO oxidation, contributing to the optimal activity over Pd/OMS-2. While the low reactivity over Pd/Mn3O4 was ascribed to a small amount of lattice oxygen and the strongly adsorbed CO on Pd0.

Enhancing the Catalytic Activity of Co3O4 Nanosheets for Li-O2 Batteries by the Incoporation of Oxygen Vacancy with Hydrazine Hydrate Reduction

Li-O2 battery attracts great interest because of the high energy density. But the poor kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) have blocked the practical application. Designing the efficient bifunctional cathode catalysts is of great importance for the Li-O2 battery. Tuning the electronic and surface structure of the catalysts plays an important role. Herein, we propose to enhance the catalytic performance of Co3O4 nanosheets for rechargable Li-O2 batteries by hydrazine hydrate-induced oxygen vacancy formation. The hydrazine hydrate reduction not only introduces oxygen vacancies into Co3O4 nanosheets and modulates the electronic structure but also roughens the surface, which all contribute to the enhancement of ORR and OER activity, especially the activity and stability for OER. Li-O2 cells catalyzed by the oxygen defects-enriched Co3O4 ultrathin nanosheets exhibit much better electrochemical performances in terms of the high initial capacity (∼11 000 mAh g-1), the lower overpotential (∼1.1 V), and the longer cycle life (150 cycles@200 mA g-1). This can be largely attributed to the synergy of the enriched oxygen vacancies and the roughened surface of Co3O4 nanosheets, which not only improves the electron and Li+ conductivity but also provides more active sites and reaction spots. The proposed facile strategy may also be applied to modify other oxides based catalysts for Li-O2 batteries or other fields.

A Renewable Platform for High-Performance Glucose Sensor Based on Co(OH)2 Nanoparticles/Three-Dimensional Graphene Frameworks

Co(OH)2 nano particles (NPs)/three-dimensional graphene frameworks (3DGFs) nano-materials was fabricated via electrochemical methods. The Co(OH)2 NPs/3DGFs hybrid retain the 3DGFs's structure and have superior catalytic activity for glucose oxidation. The electrochemical sensors based on Co(OH)2 NPs/3DGFs exhibited high sensitivity of 2410 μA cm−2mM−1, wide linear range of 2 μM to 1.4 mM, low detection limits of 0.67 μM and a quick response (less than 3s) to glucose. The Co(OH)2 NPs/3DGFs were used as a high performance platform to detect glucose in human serum, fetal bovine serum, and human urine. The excellent catalytic activity of Co(OH)2 NPs/3DGFs is attributed to the high surface area of 3DGFs and the highly catalytic activity of Co(OH)2 NPs as well as the synergistic effects between Co(OH)2 NPs and 3DGFs. Importantly, the electrochemical glucose sensor could be renewable only being refreshed in 0.1 M NaOH for ten minutes.

Isolable CO2 Adducts of Polarized Alkenes: High Thermal Stability and Catalytic Activity for CO2 Chemical Transformation

AbstractVarious CO2 adducts of tetra‐hydropyrimidin‐2‐ylidene (THPE) derived from the commercially available 1, 5‐diazabicyclo[4.3.0]non‐5‐ene (DBN) were firstly synthesized. X‐ray single crystal analysis revealed the bent geometry of the binding CO2 having an O−C−O angle of 127.50∼129.51° for THPE−CO2 adducts. In situ FTIR experiments demonstrated that THPE−CO2 adducts had unprecedented thermal stability in DMSO, even at 100 °C without decomposition. It was found that the THPE−CO2 adducts were highly active in catalyzing the carboxylative cyclization of CO2 with propargylic alcohols under mild conditions, significantly higher than the previously reported organocatalysts. Various internal and terminal functionalized propargylic alcohols were tolerated in these processes to afford the corresponding α‐alkylidene cyclic carbonates in moderate to good yields with complete (Z)‐stereoselectivity. Isotope labeling, in combination with in‐situ FTIR and stoichiometric experiments, reveal that the catalytic reaction tends to proceed via the THPE−CO2‐mediated basic ionic pair mechanism.magnified image

Ultrathin Co0.85Se nanosheet cocatalyst for visible-light CO2 photoreduction

Ultrathin Co0.85Se nanosheets were prepared via a facile solvothermal method, which successfully overcome the disadvantage of insufficient active sites in bulk Co0.85Se by reducing its thickness into the atomic scale. Co0.85Se nanosheets have been found to be efficient cocatalysts for photocatalytic CO2 reduction with TON as high as 58 in 1 h reaction under visible-light irradiation. Compared with bulk Co0.85Se blocks, the ultrathin nanosheet samples exhibited nearly 2.5 times higher activity in CO2 photoreduction. The metal-like character and ultrathin 2D structure of Co0.85Se nanosheets support the superb charges transfer and rich CO2 adsorption sites exposure for surface catalysis. A relationship between the surface structure and the cocatalytic activity was established. These results not only demonstrate the potential of a notable, affordable and earth-abundant CO2 photoreduction cocatalyst based on ultrathin Co0.85Se nanosheets but also provide a guidance in the exploration of excellent active and durable cocatalysts/catalysts to replace noble metals for artificial photosynthesis.

Lysine-assisted synthesis of porous Ba-doped Pd/γ-Al2O3 hollow microspheres with enhanced catalytic properties for CO and C3H8 oxidation

Porous Ba-doped Pd/γ-Al2O3 hollow microspheres were successfully synthesized via a simple hydrothermal method with the assistance of lysine, barium and NH4HCO3. The introduction of lysine and NH4HCO3 is beneficial to the formation of porous hollow microspheres and the promotion of specific surface area. The addition of BaO effectively improves the surface basicity of catalysts. The obtained porous Pd/Ba-γ-Al2O3 hollow microspheres are about 5–6 μm in diameter and shell thickness of 1 μm. The porous Pd/Ba-γ-Al2O3 hollow microspheres also exhibit higher catalytic activity for CO and C3H8 oxidation compared with the one without adding lysine and NH4HCO3.

Catalytic Activity of Co–X (X = S, P, O) and Its Dependency on Nanostructure/Chemical Composition in Lithium–Sulfur Batteries

Recently, cobalt-based polar materials with an unique catalytic behavior have been discovered and have shown promising electrochemical performance in lithium−sulfur (Li−S) batteries. However, there is lack of consensus on the relationship between catalytic activity and composition of different polar materials. Inconsistencies in morphologies, chemical compositions, and testing conditions lead to disparate results from laboratory to laboratory. To this end, we use zeolitic imidazolate frameworks (ZIF-67) nanosheets derived CoS2, CoP, and Co3O4 with nearly identical morphology and nanostructure to study the compositional effects on their catalytic activities and chemical absorption abilities. Combining with density functional theory calculations and electrochemical screening, we are able to confirm that CoS2 has the highest adsorption energy with polysulfides as well as the strongest catalytic activity toward polysulfides. We believe this work can inspire a more rational way to design efficient catalysts fo...

Phase and interlayer effect of transition metal dichalcogenide cocatalyst toward photocatalytic hydrogen evolution: The case of MoSe2

Visible-light-driven photocatalytic hydrogen evolution reaction (HER) is of far-reaching significance to address the energy and environmental issues. Owing to the seriously limited charge separation and surface catalytic conversion efficiency, cocatalyts especially noble-metals (e.g. Pt) are fundamentally required for this reaction. Transitional metal dichalcogenides (TMDs) represent a type of promising nonprecious cocatalysts, but they still lack effective strategies to optimize the performance. In this work, we report a rational design of MoSe2 to form interlayer-expanded 1T-phase structure, to maximize the cocatalytic activity for photocatalytic HER by optimizing the surface activation ability for reaction molecule at both edge and basal sites. In a practical photocatalytic reaction, when intergrated with a semiconductor (two-dimensional carbon nitride, 2D-C3N4), the hybrid exhibits a satisfactory hydrogen evolution rate (1672.6 μmol g−1 h−1, with external quantum efficiency of 5.2% at 420 nm) that greatly higher than the normal spacing 2H-MoSe2 (186.7 μmol g−1 h−1) and most noble-metals (e.g. Au, Ag, Pd). The giant improved HER performance strongly demonstrates the superiority of the presented phase and interlayer engineering strategy. The formation mechanism of the specialized structure and the key factor affecting the performance are also discussed. This work may provide new avenues for the design of TMDs-based catalysts toward HER application.

A Bean‐Like Formation of Germanium Nanoparticles Inside CNTs by the Subsequent Operation of Colloidal Synthesis and Catalytic Chemical Vapor Deposition Methods

AbstractThe first attempts of implanting Ge nanoparticles (Ge NPs) inside iron filled CNTs (IF‐CNTs) by a subsequent use of the bench top colloidal synthesis and chemical vapor deposition (CVD) approach is shown. Ge NPs are colloidally synthesized (with a 3.8 ± 0.6 nm in size) before the deposition. The hybrid Ge NPs/IF‐CNTs structure and morphology are characterized using high‐resolution transmission electron microscopy, scanning electron microscopy, selective area electron diffraction, and X‐ray diffraction studies. After the deposition, Ge NPs appear to be grown in size and to be sprinkled almost homogeneously into the IF‐CNTs similar to a bean‐like deposition. CNTs diameter is also identified to be enlarged drastically when using Ge NPs as a catalyst in CVD compared to the CNTs formation without Ge NPs. In addition, micro‐length rectangular Ge µPs are also found outside the nanotube core. Rietveld analysis shows the presence of γ‐Fe (Fm‐3m), ferromagnetic α‐Fe (Im‐3m), Fe3C, Ge (Fd‐3m), and multiwall CNTs. The results indicate that Ge NPs and IF‐CNTs demonstrate cocatalytic activity in increasing the respective sizes, which are dramatically larger than those obtained by the conventional approaches.

Role of Hydroxyl Groups in Low-Temperature CO Catalytic Oxidation over Zn4Si2O7(OH)2 Nanowire-Supported Gold Nanoparticles

Zn4Si2O7(OH)2 nanowires (ZSO) with abundant hydroxyl groups can be easily fabricated by a hydrothermal method. Gold nanoparticles supported on ZSO catalysts were prepared by a deposition–precipitation method and exhibited superior catalytic activity in CO oxidation at low temperatures. X-ray photoelectron spectroscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy suggested that the metal–support interactions and abundant hydroxyl groups existed in the ZSO catalysts were beneficial to CO oxidation. The influence of gold contents and calcination temperature on their catalytic performance was also investigated. Obtained results demonstrated that the 0.8% Au–ZSO catalysts pretreated at 300 °C exhibited excellent CO catalytic activity and long-term stability. On the basis of experiment results, a possible mechanism was illustrated in atomic scale by density functional theory analysis to reveal the role of hydroxyl groups in CO oxidation for the Au–ZSO catalyst.

Improved visible-light photoactivity of Pt/g-C3N4 nanosheets for solar fuel production via pretreated boric acid modification

In this work, the photocatalytic activities of g-C3N4 nanosheets for CO2 conversion and H2 production were obviously promoted by modifying an appropriate amount of Pt as the photoelectron-acceptor and co-catalyst. The optimized 0.5Pt–CN displayed ~ 2-times higher photocatalytic activities for both CO2 reduction and H2 production than those of bare CN nanosheets. Importantly, the photocatalytic activities for solar fuel production of Pt–g-C3N4 nanosheets can be further enhanced by pretreating a suitable amount of boric acid modification on g-C3N4 nanosheets. Compared to 0.5Pt–CN and bare CN, the optimized 0.5Pt–5B–CN (5% boric acid in molar ratios) displayed ~ 2- and 9-times enhancement for reducing CO2 to CO, as well as CH4 while ~ 2- and 10-times enhancement for H2 production, respectively. By means of the steady-state surface photovoltage spectra, fluorescence spectra and fluorescence spectra related to the produced ·OH amount, the exceptional photoactivities were comprehensively attributed to the boric acid-assisted high dispersion of Pt on g-C3N4 nanosheet which enhances the charge separation and improves the co-catalytic activity. This pretreated boric acid modification strategy is also applicable for other noble metals like Ag and Au. This work provides a new strategy on developing an efficient g-C3N4-based photocatalyst for solar fuel production.

Direct Synthesis of Conformal Layered Protonated Titanate Nanoarray Coatings on Various Substrate Surfaces Boosted by Low-Temperature Microwave-Assisted Hydrothermal Synthesis

Layered protonated titanates (LPTs) are promising support materials for catalytic applications because their high surface area and cation exchange capacity provide the possibility of achieving a high metal dispersion. However, the reported LPT nanomaterials are mainly limited to free-standing nanoparticles (NPs) and usually require high temperature and pressure conditions with extended reaction time. In this work, a high-throughput microwave-assisted hydrothermal method was developed for the direct synthesis of conformal LPT nanoarray coatings onto the three-dimensional honeycomb monoliths as well as other substrate surfaces at low temperature (75-95 °C) and pressure (1 atm). Using TiCl3 as the titanium source, H2O2 as the oxidant, and hydrochloric acid as the pH controller, a peroxotitanium complex (PTC) was formed and identified to play an essential role for the formation of LPT nanoarrays. The gaseous O2 released during the decomposition of PTC promotes the mass transfer of the precursors, making this method applicable to substrates with complex geometries. With the optimized conditions, a growth rate of 42 nm/min was achieved on cordierite monolith substrates. When loaded with Pt NPs, the LPT nanoarray-based monolithic catalysts showed excellent low-temperature catalytic activity for CO and hydrocarbon oxidation as well as satisfactory hydrothermal stability and mechanical robustness. The low temperature and pressure requirements of this facile hydrothermal method overcome the size- and pressure-seal restrictions of the reactors, making it feasible for scaled production of LPT nanoarray-based devices for various applications.

Bimetallic Pd@Ni-mesoporous TiO2 nanocatalyst for highly improved and selective hydrogenation of carbonyl compounds under UV light radiation

Bimetallic Pd@Ni nanostructure exhibited enhanced co-catalytic activity for the selective hydrogenation of benzaldehyde compare to their monometallic counterparts. Impregnation of these mono/bimetallic nanostructures on mesoporous TiO2 leads to several surface modifications. The bimetallic PNT-3 (Pd3@Ni1/mTiO2) exhibited large surface area (212m2g−1), and low recombination rate of the charge carriers (e−-h+). The hydrogenation reaction was analyzed under controlled experiments. It was observed that under UV-light irradiations and saturated hydrogen atmosphere the bimetallic PNT-3 photocatalyst display higher rate constant k=5.31×10−1h−1 owing to reduction in the barrier height which leads to efficiently transfer of electron at bimetallic/mTiO2 interface.

Co and Fe co-doping influence on functional properties of SrTiO3 for use as oxygen transport membranes

Perovskite-structured powders of SrTi1-xCoxO3-δ (STC-x) with nominal stoichiometry of x = 0–0.75 as well as SrTi0.75Co0.25-yFeyO3-δ (STCF-y) where y = 0–0.25 were synthesized using the Pechini method. Thermal/chemical expansion behaviour, total electrical conductivities, and oxygen permeation rates were investigated. The substitution of Ti with Co leads to an increase in both electronic and ionic conductivities and, therefore, oxygen permeability. Thermal and chemical expansions also increase slightly. The optimum Co content was found to be 25–35% due to the trade-off between phase stability and permeability. The oxygen permeation rate of STC35 is comparable to that of state-of-the-art (La,Sr)(Co,Fe)O3-δ, whereas the expansion coefficients are lower. Co-doping in STCF-y did not produce any significant differences in oxygen permeability at both high temperature and sample thickness (1.0 mm), i.e. in a solid-state diffusion-limited regime. At lower temperatures (<800 °C), STC25 exhibits higher permeability than STF25 due to the higher catalytic activity of Co compared to Fe.

Electrochemical Properties of Lithium-Air Secondary Batteries with Catalyst-Modified Carbon Electrodes

Introduction Lithium-air batteries (LABs) are one of the promising post lithium-ion battery technologies owing to its remarkably high theoretical specific energy density. Low energy efficiency and poor cyclability due to large charging overpotential should be addressed for realizing practical LABs. Recently, it was reported that the overpotential especially during charging is greatly reduced and thus the cyclability is significantly improved by modification of air electrodes with a noble metal catalyst such as Pt or Ru 1). An appropriate base metal-based electrode catalyst, e.g. Co3O4 and MnOx 2), is also capable to effectively reduce the overpotential. In this study, the base metal-based ternary (Fe-Co-Ni) and binary (Fe- Ni, Fe-Co, and Co-Ni) alloy catalysts were prepared. Their catalytic activities on the discharge-charge reactions were evaluated and compared with the RuO2 catalyst. Experimental The base metal alloy-modified carbon, Fe-Co-Ni/KB, Fe-Ni/KB, Fe-Co/KB, and Co-Ni/KB (KB: Ketjen black), were prepared via the impregnation process. RuO2/KB was also prepared by a similar method. The catalyst-modified carbon and polyvinylidene fluoride were mixed together with N-methyl-2-pyrrolidone solution. The obtained slurry was coated on the carbon paper and dried in vacuum at 80 oC overnight. The coin-type cell of CR2032 consisting of the carbon cathode, lithium metal anode, and 1 mol dm-3 LiTFSA/tetraglyme electrolyte was assembled in an Ar filled glovebox. For the electrochemical measurement, the discharge-charge tests were carried out in dry air atmosphere at 25 oC in the voltage range of 2.0 - 4.3 V at the current density of 50 μA cm-2. Results and Discussion Figure 1 shows the 1st and 20th discharge-charge curves of the coin cells with the prepared catalyst-modified carbon electrodes. The discharge behavior was similar, ca. 2.7 V of stable plateau observed, regardless of the carbon electrodes used. On the other hand, a remarkable difference was observed in the charging process, depending on the type of the catalysts. The RuO2 catalyst effectively suppresses the charging overpotential over 20 cycles. The overpotential of the Fe-Ni/KB electrode was also small during the initial charging stage at the 1st cycle, while the catalytic activity of this catalyst would be almost completely diminished after 20 cycles. On the other hand, the charging overpotential of the other electrodes with Co was very large irrespective of the cycle number. As the ternary Fe-Co-Ni catalyst is found to be not contributed to decreasing charging overpotential, the catalytic activity of Co would be considerably small and/or Co would impede the catalytic activity of other metals. Unfortunately, the air electrodes are rather spoiled by the presence of the base-metal based catalysts, probably due to oxidation of the catalysts during charging process. Improvement in catalyst durability is pivotal to achieve the cost-effective base metal-based electrode catalysts for LABs. Reference s 1) F. Wu, et al., J. Power Sources, 332, 96 (2016). 2) D. Oh, et al., J. Phys. Chem. C, 121, 1407 (2017). Acknowledgments This research was partly supported by ALCA-SPRING project of Japan Science and Technology Agency (JST). Fig.1. Discharge-charge curves at the 1st (left) and 20th (right) cycles of the metal-modified carbon electrodes. current density: 50 μA cm-2, loading density of active materials: 0.5 mg cm-2. voltage range: 2.0 - 4.3 V, discharge-charge time: 2 h, temperature: 25 ° C, atmosphere: dry air. Figure 1

Activation of Surface Oxygen Sites in a Cobalt-Based Perovskite Model Catalyst for CO Oxidation.

Anionic redox chemistry is becoming increasingly important in explaining the intristic catalytic behavior in transition-metal oxides and improving catalytic activity. However, it is a great challenge to activate lattice oxygen in noble-metal-free perovskites for obtaining active peroxide species. Here, we take La0.4Sr0.6CoO3-δ as a model catalyst and develop an anionic redox activity regulation method to activate lattice oxygen by tuning charge transfer between Co4+ and O2-. Advanced XAS and XPS demonstrate that our method can effectively decrease electron density of surface oxygen sites (O2-) to form more reactive oxygen species (O2- x), which reduces the activation energy barriers of molecular O2 and leads to a very high CO catalytic activity. The revealing of the activation mechanism for surface oxygen sites in perovskites in this work opens up a new avenue to design efficient solid catalysts. Furthermore, we also establish a correlation between anionic redox chemistry and CO catalytic activity.

Promotion effect of potassium carbonate on catalytic activity of Co3O4 for formaldehyde removal

AbstractBACKGROUNDThe effect of K2CO3 on modified Co3O4 was evaluated for the catalytic removal of formaldehyde (HCHO). The synthesized catalysts were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), BET surface area, H2 temperature‐programmed reduction (H2‐TPR), CO2 temperature‐programmed desorption (CO2‐TPD) and in situ diffuse reflectance infrared spectroscopy (DRIFTS) analyses.RESULTSThe results indicated that the Co3O4 sample modified by 3 wt% K2CO3 was able to provide 100% conversion of HCHO to CO2 at 100°C, while KNO3 and KCl could barely promote the catalytic performance of Co3O4. K2CO3 increased the valence state of Co and the number of oxygen vacancies on the surface of modified Co3O4, thereby enhancing the oxidation ability. The product water on the Co3O4 surface could convert the carbonate to bicarbonate via hydrolysis of K2CO3, which promoted hydroxyl regeneration and accelerated intermediate species oxidation.CONCLUSIONThus, the Co3O4 modified by an appropriate amount of K2CO3 exhibited an excellent performance for formaldehyde oxidation removal. © 2018 Society of Chemical Industry

Exposure of sufficient edge sites on well-crystallized MoSe2 induced by nitrogen doping (Mo−Nx) for Pt: Enhanced co-catalytic activity and methanol tolerance for oxygen reduction

To endow catalyst supports with excellent co-catalytic activity is an effective way to strengthen methanol-tolerance of Pt-based catalysts towards oxygen reduction reaction (ORR). In this study, nitrogen-doped molybdenum selenide/biomass-derived carbon (N-MoSe2/BC) composite as a Pt-support/co-catalyst is prepared via a synchronous synthesis method to enhance methanol tolerance. The porous structure of N-MoSe2/BC with N-doping can improve the exposure of coordinated Mo–Sex sites along MoSe2 edges and provide the oxygen diffusion channels to promote ORR activity. Pt-N-MoSe2/BC (Pt, 5 wt.%) shows high activity (14.83 mA cm−2) and selectivity (4e− pathway) towards ORR, promising durability (11.9% decline) and excellent tolerance against methanol-crossover effects, which are superior to those of commercial Pt/C (10 wt.%). With the introduction of pyridinic N, graphitic N and Mo−Nx in MoSe2/BC, more active sites on Pt (111) facets are activated to enhance charge transfer efficiency and ORR activity. Both N-species in BC and exposed edge sites in N-MoSe2 contribute to high methanol-tolerance and co-catalytic activity towards ORR. Therefore, the remarkable ORR activity is originated from the synergistic effects among well-distributed Pt, N-species, and active edge sites of MoSe2. Design of porous (N)-MoSe2/BC provides a promising direction for preparation of co-catalyst/support with strong methanol tolerance and ORR activity.