Methanol Tolerant Pt–C Core–Shell Cathode Catalyst for Direct Methanol Fuel Cells

Lee, Dohyeon; Gok, Sujin; Kim, Youngkwang; Sung, Yung‐Eun; Lee, Eunjik; Jang, Ji-Hoon; Hwang, Jee Youn; Kwon, Oh Joong; Lim, Taeho

doi:10.1021/acsami.0c07812

Cited by 51 publications

(26 citation statements)

References 37 publications

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“…Therefore, it is important to control and balance the thickness of the protection layer to simultaneously determine the optimal conditions for achieving high activity and stability at the same time. This strategy has been successfully extended to various types of nanoparticles (metal oxides, nitrides, and phosphides) [ 373 , 374 , 375 , 376 ] and different carbon layer formation strategies have been proposed. [ 377 , 378 , 379 , 380 ] Second, geometric confinement in porous structures can also stabilize nanoparticles against migration on supports and detachment from the supports.…”

Section: Considerations For Electrocatalytic Applications Of Nmmnsmentioning

confidence: 99%

Noble Metal‐Based Multimetallic Nanoparticles for Electrocatalytic Applications

et al. 2021

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Noble metal-based multimetallic nanoparticles (NMMNs) have attracted great attention for their multifunctional and synergistic effects, which offer numerous catalytic applications. Combined experimental and theoretical studies have enabled formulation of various design principles for tuning the electrocatalytic performance through controlling size, composition, morphology, and crystal structure of the nanoparticles. Despite significant advancements in the field, the chemical synthesis of NMMNs with ideal characteristics for catalysis, including high activity, stability, product-selectivity, and scalability is still challenging. This review provides an overview on structure-based classification and the general synthesis of NMMN electrocatalysts. Furthermore, postsynthetic treatments, such as the removal of surfactants to optimize the activity, and utilization of NMMNs onto suitable support for practical electrocatalytic applications are highlighted. In the end, future direction and challenges associated with the electrocatalysis of NMMNs are covered.

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Section: Considerations For Electrocatalytic Applications Of Nmmnsmentioning

confidence: 99%

Noble Metal‐Based Multimetallic Nanoparticles for Electrocatalytic Applications

et al. 2021

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“… 26 − 43 Carbon is the best protective layer material as gaseous substances, such as oxygen, can easily pass through it. 28 − 34 , 37 − 44 The process of carbon shell formation on platinum nanoparticles generally consists of three steps: platinum nanoparticle synthesis, carbon precursor layer formation on the nanoparticles, and subsequent carbonization. For example, Tong et al synthesized platinum nanoparticles on a carbon nanotube and formed a glucose-containing polymer layer, a carbon precursor, on them.…”

Section: Introductionmentioning

confidence: 99%

Effect of Precursor Status on the Transition from Complex to Carbon Shell in a Platinum Core–Carbon Shell Catalyst

et al. 2022

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Encapsulating platinum nanoparticles with a carbon shell can increase the stability of core platinum nanoparticles by preventing their dissolution and agglomeration. In this study, the synthesis mechanism of a platinum core–carbon shell catalyst via thermal reduction of a platinum–aniline complex was investigated to determine how the carbon shell forms and identify the key factor determining the properties of the Pt core–carbon shell catalyst. Three catalysts originating from the complexes with different platinum to carbon precursor ratios were synthesized through pyrolysis. Their structural characteristics were examined using various analysis techniques, and their electrochemical activity and stability were evaluated through half-cell and unit-cell tests. The relationship between the nitrogen to platinum ratio and structural characteristics was revealed, and the effects on the electrochemical activity and stability were discussed. The ratio of the carbon precursor to platinum was the decisive factor determining the properties of the platinum core–carbon shell catalyst.

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“…High loadings of platinum (Pt) and Pt-based materials offer good catalytic activity, chemical stability, and high exchange current density. Therefore, they are most commonly used as anode catalysts in DMFCs [ 8 , 9 , 10 ]. Nevertheless, the large utilization of Pt entails high intrinsic costs and poor durability of the fuel cell systems.…”

Section: Introductionmentioning

confidence: 99%

Free-Standing, Interwoven Tubular Graphene Mesh-Supported Binary AuPt Nanocatalysts: An Innovative and High-Performance Anode Methanol Oxidation Catalyst

et al. 2022

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Pt-based alloy or bimetallic anode catalysts have been developed to reduce the carbon monoxide (CO) poisoning effect and the usage of Pt in direct methanol fuel cells (DMFCs), where the second metal plays a role as CO poisoning inhibitor on Pt. Furthermore, better performance in DMFCs can be achieved by improving the catalytic dispersion and using high-performance supporting materials. In this work, we introduced a free-standing, macroscopic, interwoven tubular graphene (TG) mesh as a supporting material because of its high surface area, favorable chemical inertness, and excellent conductivity. Particularly, binary AuPt nanoparticles (NPs) can be easily immobilized on both outer and inner walls of the TG mesh with a highly dispersive distribution by a simple and efficient chemical reduction method. The TG mesh, whose outer and inner walls were decorated with optimized loading of binary AuPt NPs, exhibited a remarkably catalytic performance in DMFCs. Its methanol oxidation reaction (MOR) activity was 10.09 and 2.20 times higher than those of the TG electrodes with only outer wall immobilized with pure Pt NPs and binary AuPt NPs, respectively. Furthermore, the catalyst also displayed a great stability in methanol oxidation after 200 scanning cycles, implying the excellent tolerance toward the CO poisoning effect.

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Methanol Tolerant Pt–C Core–Shell Cathode Catalyst for Direct Methanol Fuel Cells

Cited by 51 publications

References 37 publications

Noble Metal‐Based Multimetallic Nanoparticles for Electrocatalytic Applications

Noble Metal‐Based Multimetallic Nanoparticles for Electrocatalytic Applications

Effect of Precursor Status on the Transition from Complex to Carbon Shell in a Platinum Core–Carbon Shell Catalyst

Free-Standing, Interwoven Tubular Graphene Mesh-Supported Binary AuPt Nanocatalysts: An Innovative and High-Performance Anode Methanol Oxidation Catalyst

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