A high-performance catalyst support for methanol oxidation with graphene and vanadium carbonitride

Huang, Taizhong; Mao, Shun; Zhou, Guihua; Zhang, Zhaoliang; Wen, Zhenhai; Huang, Xingkang; Ci, Suqin; Chen, Junhong

doi:10.1039/c4nr05244g

Cited by 80 publications

(41 citation statements)

References 49 publications

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“…As shown in Figure S4 in the SupportingI nformation, for the PQD MPA sample, the signals of Pb 4p,O1s,N1s,C1s,P2p,S i2p, and Br 3d are clearly observed at 643.6, 531.9, 401.5,2 84.4, 130.6,1 02.3, and 68.7 eV,r espectively. [27] The O1 sspectrum (Figure 6a)f or PQD MPA could be fitted with three peaks:N ÀO at 532.9 eV, [28] P=Oa t5 31.3 eV, [29] and PÀOÀPb at 530.8 eV. [12] The N1ss pectrum (Figure 6b)f or PQD MPA could be fitted with three peaks: ÀNH 3 + at 401.5 eV, [30] CÀNa t4 01.2 eV, [31] ÀNH 2 at 399.7 eV, [30b-d] andN ÀOa t3 99.0 eV.…”

Section: Resultsmentioning

confidence: 99%

“…[12] The N1ss pectrum (Figure 6b)f or PQD MPA could be fitted with three peaks: ÀNH 3 + at 401.5 eV, [30] CÀNa t4 01.2 eV, [31] ÀNH 2 at 399.7 eV, [30b-d] andN ÀOa t3 99.0 eV. [28,32] Figure 6c shows the Pb 4f spectrum of the samples of PQD MPA ,P QD HPA ,P QD TDPA , Figure 5. Normalized TRPL decay curveso ft he CH 3 NH 3 PbBr 3 perovskitef ilms with APTES and different PAs.…”

Section: Resultsmentioning

confidence: 99%

“…XPS spectra revealed the presence of PA and APTES ligands in PQDs and their interaction. Specifically,t he XPS spectras how the presence of the NÀOp eak at 532.9 eV [28] and PÀOÀPb peak at 530.80 eV [12] in O1 s, with the ÀNH 3 + peak at 401.50eV, [30] the ÀNH 2 peak at 399.7 eV, [30b-d] and the NÀO peak at 399.0 eV [28,32] As illustrated in Figure 8, at least three types of surface defect sites are expected for the PQDs:M A + ,P b 2 + ,a nd X À . Therefore, we need am inimum of three ligands to effectively passivate them.…”

Section: Mechanism Of Surface Passivationmentioning

confidence: 99%

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Synergistic Surface Passivation of CH₃NH₃PbBr₃ Perovskite Quantum Dots with Phosphonic Acid and (3‐Aminopropyl)triethoxysilane

Vickers

Rao

et al. 2019

Chemistry A European J

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CH 3 NH 3 PbBr 3 perovskite quantum dots (PQDs) are synthesized by using four different linear alkyl phosphonic acids (PAs) in conjunction with (3-aminopropyl)triethoxysilane (APTES) as capping ligands. The resultant PQDs are characterizedb ym eanso fX RD, TEM, Ramans pectroscopy, FTIR spectroscopy,U V/Vis, photoluminescence( PL), time-resolved PL, and X-ray photoelectrons pectroscopy (XPS). PA chain length is shownt oc ontrol the PQD size (ca. 2.9-4.2 nm) and excitonic absorption band positions (l = 488-525 nm), with shorter chain lengths corresponding to smaller sizes and bluer absorptions. All samples show ah igh PL quantumy ield (ca. 46-83 %) and high PL stability;t his is in-dicative of al ow density of band gap trap states and effective surface passivation.S tabilityi sh igher for smaller PQDs; this is attributed to better passivation due to better solubility and less steric hindrance of the shorter PA ligands. Based on the FTIR, Raman, and XPS results, it is proposed that Pb 2 + and CH 3 NH 3 + surface defectsa re passivated by RÀPO 3 2À or RÀPO 2 (OH) À ,w hereasB r À surface defects are passivated by RÀNH 3 + moieties. This study establishes the combination of PA and APTESl igandsa sah ighly effective dual passivation systemf or the synergistic passivation of multiple surface defects of PQDst hrough primarily ionic bonding.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Mechanism Of Surface Passivationmentioning

confidence: 99%

See 1 more Smart Citation

Synergistic Surface Passivation of CH₃NH₃PbBr₃ Perovskite Quantum Dots with Phosphonic Acid and (3‐Aminopropyl)triethoxysilane

Vickers

Rao

et al. 2019

Chemistry A European J

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“…22 In comparison with Pt/C catalysts, the potential peak values in both forward and backward scans for the Pt/graphene electrodes are more negative, indicating their superior performance. 23 Figure 6b shows that Pt/graphene electrodes have a better electrocatalytic activity when normalized by Pt loading. Indeed, the chemisorption energy is lower at the interface of graphene and Pt nanoparticles, which in turn enhances the electrolyte diffusion process, and therefore lead to higher activity.…”

Section: Resultsmentioning

confidence: 99%

Electrically Bloomed Platinum Nanoflowers on Exfoliated Graphene: An Efficient Alcohol Oxidation Catalyst

Zhang

Lopes

et al. 2016

J. Electrochem. Soc.

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Platinum (Pt) based electrocatalysts have electrochemical performance that outperforms many other noble metal and metal oxide based materials. Increasing performance allows a reduction in the platinum load, and thus reduce the cost of various devices such as fuel cells. A double pulse electrochemical approach was developed to nucleate and grow Pt nanoparticles into flower shaped assemblies on graphene sheets. The unique morphology and structure of the Pt were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM). The electrocatalytical activities of the Pt nanoflowers were evaluated using methanol and ethanol oxidation as model reactions. This proposed method has led to the synthesis of Pt nanoflowers with the ability to control, both their density and their size on defect free graphene. Alternative and renewable energy sources such as hydrogen and fuel cells provide a great opportunity to overcome the challenge of pollution and energy crises.1 However, cost, performance, and durability of these energy sources are major barrier for their wide-spread commercialization. It is the key driver behind the significant research on electrocatalysts that are used for various energy devices. Carbon supports, such as carbon black, Vulcan X and Ketjen Black, are generally used as supports for electrocatalysts for electrochemical applications. These electrodes using these carbon supports, however, present some important limitations such as inadequate corrosion resistance caused by electrochemical oxidation, structural deterioration, as well as the detachment of the active metal phase. Compared to carbon black, graphene, a two-dimensional carbon nanostructure, exhibits a higher corrosion resistance, high surface area and outstanding electronic, thermal, and mechanical properties; and is anticipated to be a promising replacement for conventional carbon supports.2-4 Recently we have developed an electrochemical exfoliation approach that reproducibly produced graphene at high yield and purity with the ability to modify graphene with polystyrene sulfonate to prevent re-stacking of the sheets. 5Making Pt-based electrocatalysts more-efficient is crucial as this directly leads to less precious metal usage, i.e. lower cost.6 Attempts to optimize the platinum utilization have occurred in parallel with the development of new ways to produce Pt nanostructures with smaller size and a better Pt dispersion on the support. 7 Several techniques have been explored in an attempt to produce efficient Pt electrocatalysts including chemical and physical methods such as chemical reduction [8][9][10] or sputter deposition techniques. 11-13 However, these techniques either lead to high metal loading with poor control of the size distribution or have proven difficult to scale up.9,14 Although great effort has been made toward the development of chimie douce production of shape-controlled Pt nanoparticles, hierarchical nanostructures with high specific surface area remain a challenge. 15 Additiona...

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“…It is further demonstrated that the VN in the 10 % Pt–VN/PGNC composite could improve the electrocatalytic ORR activity because of the synergetic effect between VN and Pt NPs. Based on the above analysis, it can be concluded that the 10 % Pt–VN/PGNC catalyst exhibits more positive onset potential and much larger current than the others, which could be attributed to the synergistic effects of VN, the good conductivity of graphitic carbon, the large specific surface area, the proper pore structures, and to the good contact between VN, Pt, and graphitic nanocarbon.…”

Section: Resultsmentioning

confidence: 91%

A Platinum–Vanadium Nitride/Porous Graphitic Nanocarbon Composite as an Excellent Catalyst for the Oxygen Reduction Reaction

Yin

Wang

et al. 2015

ChemElectroChem

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The oxygen reduction reaction (ORR) is a crucial process not only in fuel cells, but also in metal–air batteries, thus its electrocatalysts have attracted considerable attention. Here, we report the use of a vanadium nitride/porous graphitic nanocarbon (VN/PGNC) composite as an efficient support for a platinum electrocatalyst towards ORR. The VN/PGNC composite was synthesized through a gel‐coordination pyrolytic route. The gelatinous precursor formed by the coordination of VO3−, Ni2+, tetraethyl orthosilicate (TEOS), and glucose, followed by a carbonization–nitridation and a subsequent acid‐treatment process, led to the formation of the VN/PGNC composite with a large surface area of 879.0 m2 g−1. The synthetic 10 % Pt–VN/PGNC catalyst exhibited excellent ORR performance with more positive onset potential (1.02 V), 1.2 times higher mass activity (135.5 mA mg−1), 0.4 times higher specific activity (4.15 mA cm−2), and better cyclic stability compared with the commercial 20 % Pt/C catalyst. The 10 % Pt–VN/PGNC catalyst mainly exhibits a four‐electron pathway. The excellent performance of 10 % Pt–VN/PGNC catalyst is attributed to the porous structure of the support, which facilitates strong synergistic effects between the Pt and VN nanoparticles. The present work provides a cost‐effective route for the synthesis of the efficient ORR catalyst, which could promote the development of fuel cells.

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A high-performance catalyst support for methanol oxidation with graphene and vanadium carbonitride

Cited by 80 publications

References 49 publications

Synergistic Surface Passivation of CH₃NH₃PbBr₃ Perovskite Quantum Dots with Phosphonic Acid and (3‐Aminopropyl)triethoxysilane

Synergistic Surface Passivation of CH₃NH₃PbBr₃ Perovskite Quantum Dots with Phosphonic Acid and (3‐Aminopropyl)triethoxysilane

Electrically Bloomed Platinum Nanoflowers on Exfoliated Graphene: An Efficient Alcohol Oxidation Catalyst

A Platinum–Vanadium Nitride/Porous Graphitic Nanocarbon Composite as an Excellent Catalyst for the Oxygen Reduction Reaction

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A high-performance catalyst support for methanol oxidation with graphene and vanadium carbonitride

Cited by 80 publications

References 49 publications

Synergistic Surface Passivation of CH3NH3PbBr3 Perovskite Quantum Dots with Phosphonic Acid and (3‐Aminopropyl)triethoxysilane

Synergistic Surface Passivation of CH3NH3PbBr3 Perovskite Quantum Dots with Phosphonic Acid and (3‐Aminopropyl)triethoxysilane

Electrically Bloomed Platinum Nanoflowers on Exfoliated Graphene: An Efficient Alcohol Oxidation Catalyst

A Platinum–Vanadium Nitride/Porous Graphitic Nanocarbon Composite as an Excellent Catalyst for the Oxygen Reduction Reaction

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Synergistic Surface Passivation of CH₃NH₃PbBr₃ Perovskite Quantum Dots with Phosphonic Acid and (3‐Aminopropyl)triethoxysilane

Synergistic Surface Passivation of CH₃NH₃PbBr₃ Perovskite Quantum Dots with Phosphonic Acid and (3‐Aminopropyl)triethoxysilane