Platinum incorporation into titanate perovskites to deliver emergent active and stable platinum nanoparticles

Kothari, Maadhav; Jeon, Yukwon; Miller, David; Pascui, Andrea E.; Kilmartin, John; Wails, David; Ramos, Silvia; Chadwick, Alan V.; Irvine, John T. S.

doi:10.1038/s41557-021-00696-0

Cited by 83 publications

(74 citation statements)

References 24 publications

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“…Different from the deposition method to fabricate the nanoparticle‐decorated materials (NDMs), [ 13 , 14 ] the products prepared by exsolution technique generally exhibit good spatial distribution and thermal stability due to the strong bonding between nanoparticle and support. [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ] Therefore, exsolution‐based NDMs are broadly applied in all‐solid electrochemical cells. [ 11 , 18 , 22 , 23 ]…”

Section: Introductionmentioning

confidence: 99%

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A Flexible Method to Fabricate Exsolution‐Based Nanoparticle‐Decorated Materials in Seconds

2022

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Decorating metallic nanoparticles on the surface of oxide support is a promising approach to tailor the catalytic activity of perovskite. Here, for the first time using thermal shock to rapidly fabricate nanoparticle‐decorated materials (NDMs) is proposed. Low‐cost and size‐tailorable carbon paper is used as the heating source during the thermal shock. It is reported that by thermal shock technique, only ≈13 s including heating and treating time is needed to fabricate the exsolution‐based NDMs (the fastest method to date). Benefitted by the sufficiently provided driving force and the short treating time, as compared to the product prepared by the conventionally furnace‐based method, higher particle density and smaller particle size of the exsolved catalysts are acquired for the thermal shock fabricated NDM, giving rise to a fascinating improvement (12‐fold) of the electrochemical performance. This work develops a new technique to rapidly fabricate NDMs in an economic and high‐throughput manner, profoundly improving the flexibility of the application of exsolution‐based materials in electrochemical devices.

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Section: Introductionmentioning

confidence: 99%

“…[ 15 , 16 , 17 , 18 , 19 , 20 , 21 ] Therefore, exsolution‐based NDMs are broadly applied in all‐solid electrochemical cells. [ 11 , 18 , 22 , 23 ]…”

Section: Introductionmentioning

confidence: 99%

A Flexible Method to Fabricate Exsolution‐Based Nanoparticle‐Decorated Materials in Seconds

2022

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“…Materials 2022, 15, 1633 2 of 12 however, they suffer from disadvantages in terms of commercialization, such as high costs and long-term instability [11][12][13]. Therefore, alternative materials similar to Pt catalysts, including metal oxides [14,15], metal chalcogenides [16], and carbon materials [17,18], have been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…The oxygen reduction reaction (ORR) is important for determining the performance of fuel cells; therefore, the use of catalysts to promote ORR is essential for realizing the practical applications of fuel cells [ 4 , 5 , 6 , 7 ]. With regard to the materials, generally, Pt-based catalysts exhibit remarkable electrocatalytic activity for the ORR [ 8 , 9 , 10 ]; however, they suffer from disadvantages in terms of commercialization, such as high costs and long-term instability [ 11 , 12 , 13 ]. Therefore, alternative materials similar to Pt catalysts, including metal oxides [ 14 , 15 ], metal chalcogenides [ 16 ], and carbon materials [ 17 , 18 ], have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Systematic Study of Effective Hydrothermal Synthesis to Fabricate Nb-Incorporated TiO2 for Oxygen Reduction Reaction

et al. 2022

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Fuel cells are expected to serve as next-generation energy conversion devices owing to their high energy density, high power, and long life performance. The oxygen reduction reaction (ORR) is important for determining the performance of fuel cells; therefore, using catalysts to promote the ORR is essential for realizing the practical applications of fuel cells. Herein, we propose Nb-incorporated TiO2 as a suitable alternative to conventional Pt-based catalysts, because Nb doping has been reported to improve the conductivity and electron transfer number of TiO2. In addition, Nb-incorporated TiO2 can induce the electrocatalytic activity for the ORR. In this paper, we report the synthesis method for Nb-incorporated TiO2 through a hydrothermal process with and without additional load pressures. The electrocatalytic activity of the synthesized samples for the ORR was also demonstrated. In this process, the samples obtained under various load pressures exceeding the saturated vapor pressure featured a high content of Nb and crystalline TiNb2O7, resulting in an ellipsoidal morphology. X-ray diffraction results also revealed that, on increasing the Nb doping amounts, the diffraction peak of the anatase TiO2 shifted to a lower angle and the full width at half maximum decreased. This implies that the Ti atom is exchanged with the Nb atom during this process, resulting in a decrease in TiO2 crystallinity. At a doping level of 10%, Nb-incorporated TiO2 exhibited the best electrocatalytic activity in terms of the oxygen reduction current (iORR) and onset potential for the ORR (EORR); this suggests that 10% Nb-doped samples have the potential for enhancing electrocatalytic activity.

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“…[23] Theinterconnection of the internal pores of the PSC structure facilitates gas diffusion to enhance coking resistance.T he exsolution process is an effective method to create strong metal-oxide interfaces by anchoring active metal nanoparticles onto the surface of the oxide supports,b ym eans of which the catalysts would show excellent carbon coking resistance and sintering resistance. [25][26][27][28] Specifically,i nt his process,c atalytically active and reducible metal nanoparticles in situ exsolve on the oxide surface from the cations doped into the support oxide in ar educing atmosphere. [29][30] Exsolving Ni from fluorite-type solid solutions of PSC Ni x Ce 1Àx O 2 monoliths would yield SC Ni nanoparticles uniformly anchored onto the surface of PSC CeO 2 monoliths, which would create the well-defined interface structures with strong interaction in the porous architectures.T he synergistic activation of CH 4 and CO 2 at the active exsolved metal-oxide interfaces would facilitate the dry reforming reaction and show potential carbon coking resistance and sintering resistance at reduced temperatures.…”

Section: Introductionmentioning

confidence: 99%

Active Exsolved Metal–Oxide Interfaces in Porous Single‐Crystalline Ceria Monoliths for Efficient and Durable CH₄/CO₂Reforming

Xie

Xiao

2021

Angewandte Chemie

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Dry reforming of CH 4 /CO 2 provides an attractive route to convert greenhouse gas into syngas;h owever,t he resistance to sintering and coking of catalyst remains afundamental challenge at high operation temperatures.H ere we create active and durable metal-oxide interfaces in porous single-crystalline (PSC) CeO 2 monoliths with in situ exsolved single-crystalline (SC) Ni particles and show efficient dry reforming of CH 4 /CO 2 at temperatures as lowa s4 50 8 8C. We show the excellent and durable performance with % 20 %o f CH 4 conversion and % 30 %o fC O 2 conversion even in ac ontinuous operation of 240 hours.T he well-defined active metal-oxide interfaces,c reated by exsolving SC Ni nanoparticles from PSC Ni x Ce 1Àx O 2 to anchor them on PSC CeO 2 scaffolds,p revent nanoparticle sintering and enhance the coking resistance due to the stronger metal-support interactions.Our work would enable an industrially and economically viable path for carbon reclamation, and the technique of creating active and durable metal-oxide interfaces in PSC monoliths could lead to stable catalyst designs for many challenging reactions.

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Platinum incorporation into titanate perovskites to deliver emergent active and stable platinum nanoparticles

Abstract: The version in the Kent Academic Repository may differ from the final published version. Users are advised to check http://kar.kent.ac.uk for the status of the paper. Users should always cite the published version of record.

Cited by 83 publications

References 24 publications

A Flexible Method to Fabricate Exsolution‐Based Nanoparticle‐Decorated Materials in Seconds

A Flexible Method to Fabricate Exsolution‐Based Nanoparticle‐Decorated Materials in Seconds

Systematic Study of Effective Hydrothermal Synthesis to Fabricate Nb-Incorporated TiO2 for Oxygen Reduction Reaction

Active Exsolved Metal–Oxide Interfaces in Porous Single‐Crystalline Ceria Monoliths for Efficient and Durable CH₄/CO₂Reforming

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Platinum incorporation into titanate perovskites to deliver emergent active and stable platinum nanoparticles

Abstract: The version in the Kent Academic Repository may differ from the final published version. Users are advised to check http://kar.kent.ac.uk for the status of the paper. Users should always cite the published version of record.

Cited by 83 publications

References 24 publications

A Flexible Method to Fabricate Exsolution‐Based Nanoparticle‐Decorated Materials in Seconds

A Flexible Method to Fabricate Exsolution‐Based Nanoparticle‐Decorated Materials in Seconds

Systematic Study of Effective Hydrothermal Synthesis to Fabricate Nb-Incorporated TiO2 for Oxygen Reduction Reaction

Active Exsolved Metal–Oxide Interfaces in Porous Single‐Crystalline Ceria Monoliths for Efficient and Durable CH4/CO2Reforming

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Active Exsolved Metal–Oxide Interfaces in Porous Single‐Crystalline Ceria Monoliths for Efficient and Durable CH₄/CO₂Reforming