Rational syntheses of core–shell Fe@(PtRu) nanoparticle electrocatalysts for the methanol oxidation reaction with complete suppression of CO-poisoning and highly enhanced activity

Matin, Md. Abdul; Lee, Eunjik; Kim, Hyunchul; Yoon, Won‐Sub; Kwon, Young‐Uk

doi:10.1039/c5ta03809j

Cited by 161 publications

(75 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5% unreacted Pt(IV). 54 The TEM image (as shown in Fig. S11, ESI †) of Pt/CTF-1-100W shows that the Pt particles are 1-5 nm and highly dispersed , which is 50 times higher than the widely used reference polymer photocatalyst 3 wt%Pt/g-C 3 N 4 , as shown in Fig.…”

Section: Resultsmentioning

confidence: 97%

Efficient visible light-driven water oxidation and proton reduction by an ordered covalent triazine-based framework

Xie

Shevlin

Ruan

et al. 2018

Energy Environ. Sci.

251

188

View full text Add to dashboard Cite

aWater oxidation is a rate-determining step in solar driven H 2 fuel synthesis and is technically challenging to promote. Despite decades of effort, only a few inorganic catalysts are effective and even fewer are effective under visible light. Recently, attention has been paid to synthetic semiconducting polymers, mainly on graphitic C 3 N 4 , with encouraging hydrogen evolution performance but lower activity for water oxidation. Here, a highly ordered covalent triazine-based framework, CTF-1 (C 8 N 2 H 4 ), is synthesised by a very mild microwave-assisted polymerisation approach. It demonstrates extremely high activity for oxygen evolution under visible light irradiation, leading to an apparent quantum efficiency (AQE) of nearly 4% at 420 nm. Furthermore, the polymer can also efficiently evolve H 2 from water. A high AQE of 6% at 420 nm for H 2 production has also been achieved. The polymer holds great potential for overall water splitting. This exceptional performance is attributed to its well-defined and ordered structure, low carbonisation, and superior band positions. Broader contextSplitting water by sunlight is an attractive renewable approach to generate clean hydrogen for producing chemicals or powering vehicles. This ultra-pure hydrogen also avoids the dreaded catalyst poisoning, which occurs even with very low levels of CO residuals from fossil-fuel generated hydrogen. The key challenge to sustain continued hydrogen generation from this artificial photosynthesis process is to speed up the water oxidation reaction, which is hard to proceed due to multiple electron transfer steps. Oxidation catalysts based on polymeric semiconductors are particularly promising for this purpose because of their abundance leading to low cost, tunable band structure to match the solar spectrum and variable degree of conjugation to impact on the p-p* excitation for efficient electron transfer. With a moderate microwave assisted strategy, we are able to control the degree of conjugation and minimise the undesirable structural carbonisation of a new type of polymeric photocatalyst-covalent triazine-based framework. The optimised catalyst shows advantageous band positions, to capture a wide spectrum of visible light and enhance the charge separation efficiency, leading to very high water oxidation and hydrogen evolution capabilities. The overall discovery paves the way for the development of efficient and continuous clean hydrogen production from the renewable visible-light water splitting process.

show abstract

Section: Resultsmentioning

confidence: 97%

Efficient visible light-driven water oxidation and proton reduction by an ordered covalent triazine-based framework

Xie

Shevlin

Ruan

et al. 2018

Energy Environ. Sci.

251

188

View full text Add to dashboard Cite

show abstract

“…The spectrum of Pt 4f ( Figure 4I) also shows two peaks at 72.8 eV (Pt 4f 7/2 ) and 77.1 eV (Pt 4f 5/2 ), indicating the divalent state of metal in M-CQDs. 39,40 The Pd and Pt metal content in the corresponding M-CQDs is measured to be 3.5% and 2.6%, respectively. The XPS spectrum clearly demonstrated that the metals (Pd or Pt) have been successfully embedded into the CQDs through the hydrothermal treatment of related metal complex of TPP.…”

Section: Xps Characterizationmentioning

confidence: 99%

Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

Wang

et al. 2017

IJN

159

View full text Add to dashboard Cite

N-rich metal-free and metal-doped carbon quantum dots (CQDs) have been prepared through one-step hydrothermal method using tetraphenylporphyrin or its transition metal (Pd or Pt) complex as precursor. The structures and morphology of the as-prepared nanoparticles were analyzed by X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectra. Three kinds of nanocomposites show similar structures except for the presence of metal ions in Pd-CQDs and Pt-CQDs indicated by X-ray photoelectron spectroscopy. All of them display bright blue emission upon exposure to ultraviolet irradiation. The CQDs exhibit typical excitation-dependent emission behavior, with the emission quantum yield of 10.1%, 17.8%, and 15.2% for CQDs, Pd-CQDs, and Pt-CQDs, respectively. Moreover, the CQDs, Pd-CQDs, and Pt-CQDs could serve as fluorescent probes for the specific and sensitive detection of Fe 3+ ions in aqueous solution. The low cytotoxicity of CQDs is demonstrated by MTT assay against HeLa cells. Therefore, the CQDs can be used as efficient probes for cellular multicolor imaging and fluorescence sensors for the detection of Fe 3+ ions due to their low toxicity, excellent biocompatibility, and low detection limits. This work provides a new route to synthesize highly luminescent N-rich metal-free or metal-doped CQDs for multifunctional applications.

show abstract

“…In addition, the onset potential of MOR for the resulting PtRuCu 6 -A/C was − 173 mV, presenting a negative shift of 42 and 173 mV as compared with PtRu/C and Pt/C. Here, Matin et al [153] suggested that the good CO tolerance and catalytic activity of PtRu shells originate from both bifunctional mechanisms with the presence of Ru and effects from the core such as compressive strains.…”

Section: Core-shell-structured Catalysts With Alloy Shellsmentioning

confidence: 99%

“…Here, experimental and theoretical data showed that the resulting PtFe 1.2 /C with the highest Fe content and a monolayer Pt shell provided the highest ORR activity. In another example, Matin et al [153] prepared a core-shellstructured Fe@PtRu catalyst using one-step sonochemical reactions that demonstrated enhanced MOR electrocatalytic activities by a factor of up to 2.5 based on I f and improved stability as compared with a commercial PtRu-alloy (PtRu) catalyst, particularly in the complete suppression of COpoisoning. As shown in Fig.…”

Section: Fe As Corementioning

confidence: 99%

“…Another feature of Ru that distinguishes it from other metals is that in terms of bifunctional mechanisms, it can provide adsorbed hydroxyls (Ru-OH ads ) to catalyst surfaces which can help adjacent active Pt atoms (Pt-CO ads ) to easily catalyze CO oxidation reactions [550]. And with this in mind, Ru has been introduced into Pt shells to form PtRu alloy shells by several groups [153,207,208,494,[551][552][553][554]. For example, Huang et al [208] synthesized PtRu shells through the chemical corrosion of PtRuCu alloys (denoted as PtRuCu 6 -A/C) and the resulting catalyst exhibited a forward peak with a 1632.5 A g Pt −1 current density that was approximately 3.3 and 10.6 times more active than PtRu/C and Pt/C, respectively.…”

Section: Core-shell-structured Catalysts With Alloy Shellsmentioning

confidence: 99%

See 1 more Smart Citation

Core–Shell-Structured Low-Platinum Electrocatalysts for Fuel Cell Applications

Wang

Luo

et al. 2018

Electrochem. Energ. Rev.

View full text Add to dashboard Cite

Pt-based catalysts are the most efficient catalysts for low-temperature fuel cells. However, commercialization is impeded by prohibitively high costs and scarcity. One of the most effective strategies to reduce Pt loading is to deposit a monolayer or a few layers of Pt over other metal cores to form core-shell-structured electrocatalysts. In core-shell-structured electrocatalysts, the compositions of the core can be divided into five classes: single-precious metallic cores represented by Pd, Ru, and Au; singlenon-precious metallic cores represented by Cu, Ni, Co, and Fe; alloy cores containing 3d, 4d or 5d metals; and carbide and nitride cores. Of these, researchers have found that carbide and nitride cores can yield tremendous advantages over alloy cores in terms of cost and promotional activities of Pt shells. In addition, desirable shells with reasonable thicknesses and compositions have been recognized to play a dominant role in electrocatalytic performances. And recently, researchers have also found that the catalytic activity of core-shell-structured catalysts is dependent on the binding energy of the adsorbents, which is determined by the d-band center of Pt. The shifting of this d-band center in turn is mainly affected by strain and electronic effects, which can be adjusted by adjusting core compositions and shell thicknesses of catalysts. In the development of these core-shell structures, optimal synthesis methods are of primary concern because they directly determine the practical application potential of the resulting electrocatalysts. And in this article, the principles behind core-shell-structured low-Pt electrocatalysts and the developmental progresses of various synthesis methods along with the traits of each type of core and its effects on Pt shell catalytic activities are discussed. In addition, perspectives on this type of catalyst are discussed and future research directions are proposed.

show abstract

Rational syntheses of core–shell Fe@(PtRu) nanoparticle electrocatalysts for the methanol oxidation reaction with complete suppression of CO-poisoning and highly enhanced activity

Cited by 161 publications

References 77 publications

Efficient visible light-driven water oxidation and proton reduction by an ordered covalent triazine-based framework

Efficient visible light-driven water oxidation and proton reduction by an ordered covalent triazine-based framework

Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

Core–Shell-Structured Low-Platinum Electrocatalysts for Fuel Cell Applications

Contact Info

Product

Resources

About