Sustainable CO<sub>2</sub>-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Najafli, Erkin; Ratso, Sander; Ivanov, Yurii P.; Gatalo, Matija; Pavko, Luka; Yörük, Can Rüstü; Walke, Peter; Divitini, Giorgio; Hodnik, Nejc; Kruusenberg, Ivar

doi:10.1021/acsanm.3c00208

Cited by 8 publications

(4 citation statements)

References 43 publications

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“…In this study, we attempted to develop zinc-rich intermetallic catalysts with Rh, Pt, and Pd via a CaH 2 -assisted molten salt synthesis method with a stronger reduction capacity than the common hydrogen reduction method. Molten salt synthesis is a good technique to obtain active catalysts [9][10][11][12]. Previously, we prepared some nanosized intermetallic compounds using the CaH 2 -assisted molten salt synthesis [13] and exhibited that some are available as good catalyst supports, such as Ti 6 Si 7 Ni 16 [14], and some are active species, such as TiNi [15], YIr 2 [16], CaPt 2 [17].…”

Section: Introductionmentioning

confidence: 99%

CaH2-Assisted Molten Salt Synthesis of Zinc-Rich Intermetallic Compounds of RhZn13 and Pt3Zn10 for Catalytic Selective Hydrogenation Application

Kobayashi,

Yamamoto,

Shoji

2024

Crystals

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Zinc-included intermetallic compound catalysts of RhZn, PtZn, and PdZn with a molar ration of Zn/metal = 1/1, which are generally prepared using a hydrogen reduction approach, are known to show excellent catalytic performance in some selective hydrogenations of organic compounds. In this study, in order to reduce the incorporated mounts of the expensive noble metals, we attempted to prepare zinc-rich intermetallic compounds via a CaH2-assisted molten salt synthesis method with a stronger reduction capacity than the common hydrogen reduction method. X-ray diffraction results indicated the formation of RhZn13 and Pt3Zn10 in the samples prepared by the reduction of ZnO-supported metal precursors. In a hydrogenation reaction of p-nitrophenol to p-aminophenol, the ZnO-supported RhZn13 and Pt3Zn10 catalysts showed a higher selectivity than the RhZn/ZnO and PtZn/ZnO catalysts with the almost similar conversions. Thus, it was demonstrated that the zinc-rich intermetallic compounds of RhZn13 and Pt3Zn10 could be superior selective hydrogenation catalysts compared to the conventional intermetallic compound catalysts of RhZn and PtZn.

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Section: Introductionmentioning

confidence: 99%

CaH2-Assisted Molten Salt Synthesis of Zinc-Rich Intermetallic Compounds of RhZn13 and Pt3Zn10 for Catalytic Selective Hydrogenation Application

Kobayashi,

Yamamoto,

Shoji

2024

Crystals

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“…ZAB has drawn the attraction of researchers as one of the potential energy storage and conversion technologies. − The two variables that have the greatest influence on ZAB performance are the characteristics of ORR and OER. However, the commercial growth and application of ZAB are constrained by the slow kinetics of the ORR and OER. − The general trend to address this problem is to create a bifunctional oxygen electro-catalyst to catalyze ORR and OER. − …”

Section: Introductionmentioning

confidence: 99%

Fe–N/P-co-Doped Three-Dimensional Graphene Bifunctional Oxygen Electrocatalysts for Rechargeable Zinc–Air Batteries

Duan,

Wang,

Sun

et al. 2023

ACS Appl. Nano Mater.

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The evolution of highly active dual-functional catalysts is critical to zinc–air batteries (ZAB). Herein, three-dimensional Fe–N/P-co-doped graphene (3D Fe–N/P-G) materials with a high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) response are prepared by a molten salt protection method with KCl. The 3D Fe–N/P-G exhibits a large Brunauer–Emmett–Teller (BET) surface area and a dense network of pores for improved mass transfer efficiency. The addition of P atoms is able to produce a synergistic effect that improves the ORR catalytic activity of the 3D Fe–N/P-G catalyst. Regarding electrical efficiency, the ORR half-wave potential (E 1/2) of 3D Fe–N/P-G catalytic is 0.860 V vs reversible hydrogen electrode (RHE) and the electron transfer number is 3.98 from 0.4 to 0.7 V vs RHE. The small overvoltage (ΔE = E j = 10 – E 1/2) of 3D Fe–N/P-G is 0.77 V. Additionally, the zinc–air battery with 3D Fe–N/P-G as a trigger for the cathode has high power density (170 mW cm–2), specific capacity (671 mAh g–1), small charge/discharge polarization, and outstanding prolonged stability. It is suggested that 3D Fe–N/P-G is a powerful bifunctional cathode ZAB catalyst.

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“…In recent years, there have been an increasing number of studies on developing new strategies for the synthesis of carbon materials. For instance, the electrolysis of CO 2 with the formation of carbon is regarded as both an environmentally friendly route to produce carbon materials and a new CO 2 capture technology [1,2]. However, this approach is poorly capable of fine-tuning the structure and properties of carbon materials.…”

Section: Introductionmentioning

confidence: 99%

Resorcinol–Formaldehyde-Derived Carbon Xerogels: Preparation, Functionalization, and Application Aspects

Veselov,

Vedyagin

2023

Materials

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Carbon xerogels (CXs) are materials obtained via the pyrolysis of resins prepared via the sol–gel polycondensation of resorcinol and formaldehyde. These materials attract great attention as adsorbents, catalyst supports, and energy storage materials. One of the most interesting features of CXs is the possibility of fine-tuning their structures and textures by changing the synthesis conditions in the sol–gel stage. Thus, the first part of this review is devoted to the processes taking place in the polycondensation stage of organic precursors. The formation of hydroxymethyl derivatives of resorcinol and their polycondensation take place at this stage. Both of these processes are catalyzed by acids or bases. It is revealed that the sol–gel synthesis conditions, such as pH, the formaldehyde/resorcinol ratio, concentration, and the type of basic modifier, all affect the texture of the materials being prepared. The variation in these parameters allows one to obtain CXs with pore sizes ranging from 2–3 nm to 100–200 nm. The possibility of using other precursors for the preparation of organic aerogels is examined as well. For instance, if phenol is used instead of resorcinol, the capabilities of the sol–gel method become rather limited. At the same time, other phenolic compounds can be applied with great efficiency. The methods of gel drying and the pyrolysis conditions are also reviewed. Another important aspect analyzed within this review is the surface modification of CXs by introducing various functional groups and heteroatoms. It is shown that compounds containing nitrogen, sulfur, boron, or phosphorus can be introduced at the polycondensation stage to incorporate these elements into the gel structure. Thus, the highest surface amount of nitrogen (6–11 at%) was achieved in the case of the polycondensation of formaldehyde with melamine and hydroxyaniline. Finally, the methods of preparing metal-doped CXs are overviewed. Special attention is paid to the introduction of a metal precursor in the gelation step. The elements of the iron subgroup (Fe, Ni, Co) were found to catalyze carbon graphitization. Therefore, their introduction can be useful for enhancing the electrochemical properties of CXs. However, since the metal surface is often covered by carbon, such materials are poorly applicable to conventional catalytic processes. In summary, the applications of CXs and metal-doped CXs are briefly mentioned. Among the promising application areas, Li-ion batteries, supercapacitors, fuel cells, and adsorbents are of special interest.

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Sustainable CO₂-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Cited by 8 publications

References 43 publications

CaH2-Assisted Molten Salt Synthesis of Zinc-Rich Intermetallic Compounds of RhZn13 and Pt3Zn10 for Catalytic Selective Hydrogenation Application

CaH2-Assisted Molten Salt Synthesis of Zinc-Rich Intermetallic Compounds of RhZn13 and Pt3Zn10 for Catalytic Selective Hydrogenation Application

Fe–N/P-co-Doped Three-Dimensional Graphene Bifunctional Oxygen Electrocatalysts for Rechargeable Zinc–Air Batteries

Resorcinol–Formaldehyde-Derived Carbon Xerogels: Preparation, Functionalization, and Application Aspects

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Sustainable CO2-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction

Cited by 8 publications

References 43 publications

CaH2-Assisted Molten Salt Synthesis of Zinc-Rich Intermetallic Compounds of RhZn13 and Pt3Zn10 for Catalytic Selective Hydrogenation Application

CaH2-Assisted Molten Salt Synthesis of Zinc-Rich Intermetallic Compounds of RhZn13 and Pt3Zn10 for Catalytic Selective Hydrogenation Application

Fe–N/P-co-Doped Three-Dimensional Graphene Bifunctional Oxygen Electrocatalysts for Rechargeable Zinc–Air Batteries

Resorcinol–Formaldehyde-Derived Carbon Xerogels: Preparation, Functionalization, and Application Aspects

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Sustainable CO₂-Derived Nanoscale Carbon Support to a Platinum Catalyst for Oxygen Reduction Reaction