Shell-thickness-dependent Pd@PtNi core–shell nanosheets for efficient oxygen reduction reaction

Chen, Qiuyan; Chen, Zhenyu; Ali, Asad; Luo, Yeqiang; Feng, Huiyan; Luo, Yuanyan; Tsiakaras, Panagiotis; Shen, Pei Kang

doi:10.1016/j.cej.2021.131565

Cited by 49 publications

(25 citation statements)

References 56 publications

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“…band center of Pt and weakening the ability to adsorb oxygencontaining species. [26] To study the electrochemical activities of PtCo@NC-X catalysts with different NC shell thicknesses, the cyclic voltammetry (CV) and linear sweep voltammetry (LSV) tests are carried out. As shown in Figure 5a, the PtCo@NC-X exhibit a higher oxidized potential compared to commercial Pt/C catalyst, suggesting that the weaker adsorption capacity for oxygencontain material of Pt in the as-prepared catalyst, which is consistent with the XPS and CO stripping results.…”

Section: Chemelectrochemmentioning

confidence: 99%

Ordered PtCo Intermetallics Featuring Nitrogen‐Doped Carbon Prepared by Surface Coating Strategy for Oxygen Reduction Reaction

et al. 2022

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Improving the activity and stability of Pt‐based electrocatalysts is essential for large‐scale commercial applications of fuel cells. The ordered Pt‐based alloy nanomaterials encapsulated by coating have attracted significant attention. Here, we displayed a surface coating strategy to synthesize structurally ordered PtCo alloy catalysts featuring nitrogen‐doped carbon (NC). Experimental results reveal that the sample with appropriate dopamine feeding content shows enhanced oxygen reduction activity and stability, which exhibits a mass activity of 1.36 mA ⋅ mg−1Pt and specific activity of 1.98 mA ⋅ cm−2, superior to those of excessive or low dopamine adding content samples and commercial Pt/C catalyst. The enhanced electrocatalytic performance of this catalyst was attributed to the combined effect including the protection of suitable thickness NC shells, strong electronic interaction and high ordering degree. In this work, the surface coating strategy provides available references to further improve the oxygen reduction performance of PtM alloy catalysts.

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Section: Chemelectrochemmentioning

confidence: 99%

Ordered PtCo Intermetallics Featuring Nitrogen‐Doped Carbon Prepared by Surface Coating Strategy for Oxygen Reduction Reaction

et al. 2022

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“…However, they also suffer from the major drawbacks of high cost, poor cycling stability, and low tolerance against the fuel crossover effect. 61,62 Therefore, many noble-metal-free materials have been developed as promising candidates for the ORR. One of the most important limitations towards improving their catalytic performance is their lack of active sites.…”

Section: Orrmentioning

confidence: 99%

Electrospun one-dimensional electrocatalysts for boosting electrocatalysis

Ding

Qiao

2022

CrystEngComm

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“…9 Even so, a single-layer shell of Pt atoms remains insufficient for the long-time operation required by fuel cells, particularly for HDVs. Accordingly, several attempts to modify the Pt-based core−shell catalysts to further improve the overall ORR performance have been reported, and these attempts involve forming an ordered intermetallic structure, 3,10−12 doping anions in cores, 2,3,13,14 controlling shapes, 14−16 tuning the thickness of the shells, 17,18 and adjusting the core/shell composition. 19−21 In this Account, we summarize recent advances in Pt-based core−shell catalysts, including synthesis strategies (section 2), catalytic mechanisms of Pt ML on PGM core catalysts (section 3), PtM core−shell catalysts (M represents PGM-free metals) (section 4), the effect of shell structures (section 5), and the evaluation of fuel cell testing (section 6).…”

Section: Introductionmentioning

confidence: 99%

“…Even so, a single-layer shell of Pt atoms remains insufficient for the long-time operation required by fuel cells, particularly for HDVs. Accordingly, several attempts to modify the Pt-based core–shell catalysts to further improve the overall ORR performance have been reported, and these attempts involve forming an ordered intermetallic structure, ,− doping anions in cores, ,,, controlling shapes, − tuning the thickness of the shells, , and adjusting the core/shell composition. − …”

Section: Introductionmentioning

confidence: 99%

Advanced Pt-Based Core–Shell Electrocatalysts for Fuel Cell Cathodes

2022

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Conspectus Proton-exchange membrane fuel cells (PEMFCs) are highly efficient energy storage and conversion devices. Thus, the platinum group metal (PGM)-based catalysts which are the dominant choice for the PEMFCs have received extensive interest during the past couple of decades. However, the drawbacks in the existing PGM-based catalysts (i.e., high cost, slow kinetics, poor stability, etc.) still limit their applications in fuel cells. The Pt-based core–shell catalysts potentially alleviate these issues through the low Pt loading with the associated low cost and the high corrosion resistance and further improve the oxygen reduction reaction’s (ORR’s) activity and stability. This Account focuses on the synthetic strategies, catalytic mechanisms, factors influencing enhanced ORR performance, and applications in PEMFCs for the Pt-based core–shell catalysts. We first highlight the synthetic strategies for Pt-based core–shell catalysts including the galvanic displacement of an underpotentially deposited non-noble metal monolayer, thermal annealing, and dealloying methods, which can be scaled-up to meet the requirements of fuel cell operations. Subsequently, catalytic mechanisms such as the self-healing mechanism in the Pt monolayer on Pd core catalysts, the pinning effect of nitrogen (N) dopants in N-doped PtNi core–shell catalysts, and the ligand effect of the ordered intermetallic structure in L10-Pt/CoPt core–shell catalysts and their synergistic effects in N-doped L10-PtNi catalysts are described in detail. The core–shell structure in the Pt-based catalysts have two main effects for enhanced ORR performance: (i) the interaction between Pt shells and core substrates can tune the electronic state of the surface Pt, thus boosting the ORR activity and stability, and (ii) the outer Pt shell with modest thickness can enhance the oxidation and dissolution resistance of the core, resulting in improved durability. We then review the recent attempts to optimize the ORR performance of the Pt-based core–shell catalysts by considering the shape, composition, surface orientation, and shell thickness. The factors influencing the ORR performance can be grouped into two categories: the effect of the core and the effect of the shell. In the former, PtM core–shell catalysts which use different non-PGM element cores (M) are summarized, and in the latter, Pt-based core–shell catalysts with different shell structures and compositions are described. The modifications of the core and/or shell structure can not only optimize the intermediate-binding energetics on the Pt surface through tuning the strain of the surface Pt, which increases the intrinsic activity and stability, but also offer a significantly decreased catalyst cost. Finally, we discuss the membrane electrode assembly performance of Pt-based core–shell catalysts in fuel cell cathodes and evaluate their potential in real PEMFCs for light-duty and heavy-duty vehicle applications. Even though some challenges to the activity and lifetime in the fuel cells remain, the Pt-based c...

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Shell-thickness-dependent Pd@PtNi core–shell nanosheets for efficient oxygen reduction reaction

Cited by 49 publications

References 56 publications

Ordered PtCo Intermetallics Featuring Nitrogen‐Doped Carbon Prepared by Surface Coating Strategy for Oxygen Reduction Reaction

Ordered PtCo Intermetallics Featuring Nitrogen‐Doped Carbon Prepared by Surface Coating Strategy for Oxygen Reduction Reaction

Electrospun one-dimensional electrocatalysts for boosting electrocatalysis

Advanced Pt-Based Core–Shell Electrocatalysts for Fuel Cell Cathodes

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