Dealloyed Pt3Co nanoparticles with higher geometric strain for superior hydrogen evolution reaction

Saquib, Mohammad; Halder, Aditi

doi:10.1016/j.jssc.2018.03.030

Cited by 34 publications

(18 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The distribution positions of Pt were not exactly similar to Co, which indicated that the addition of HCl partly dissolved Co of the PtCo alloy and exposed more active Pt sites to form a rich Pt layer. This result is wholly consistent with other reported dealloying Pt-M (M: transition metal) (Shreya et al, 2017;Saquib and Halder, 2018).…”

Section: Materials Synthesis and Characterizationsupporting

confidence: 93%

“…It implies that the dealloying treatment can keep the PtCo alloy skeleton structure, resulting in the synergistic effect of bimetal which is favorable to electrocatalysis. On the other hand, the Co atoms on the surface of the PtCo alloy were moved and the Pt atoms in the sub-layer were exposed by dealloying endowing the as-prepared catalyst a Pt-rich and rough surface (Saquib and Halder, 2018).…”

Section: Materials Synthesis and Characterizationmentioning

confidence: 99%

“…Previous reports indicated that when using the hydrochloride to remove Co or Cu from a Pt-M alloy, it may lead to decreased Pt-Pt interatomic distances and cause Pt d-bands to downshift, resulting in the strength of metal-adsorbate bond weakening. Thus, hydrogen was easier to be desorbed from Pt surface, which was beneficial to the reaction kinetic of HER (Saquib and Halder, 2018). Meanwhile, the enlarged ECSA result from the roughed surface and more exposed Pt active sites incorporated with a certain number of defects in the dealloying PtCo catalyst also contributed to the performance improvement.…”

Section: Electrocatalytic Her Performance Of Materialsmentioning

confidence: 99%

“…To date, the promising dealloying bimetallic catalysts are seldom developed and investigated in relation to hydrogen evolution in water splitting. Furthermore, the surface dealloying is generally implemented by an in-situ electrochemical dealloying method (Gasteiger et al, 2005;Mani et al, 2008;Gan et al, 2013;Han et al, 2015;Saquib and Halder, 2018), which is relatively complicated, has a high energy consumption or pollution emission, and is not suitable for real large-scale syntheses.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Surface Roughed and Pt-Rich Bimetallic Electrocatalysts for Hydrogen Evolution Reaction

Wang

Yu²,

Feng³

et al. 2020

Front. Chem.

View full text Add to dashboard Cite

Platinum-based alloys with low cost transition metals have been considered as promising electrocatalysts in the field of sustainable energy conversion and storage. Herein, chloroplatinic acid, cobalt chloride, and carbon nanotubes are used as platinum, cobalt precursors, and carriers, respectively, to prepare rich Pt dealloying PtCo nanoparticles (SD-PtCo/CNT) via co-liquid phase reduction and chemical dealloying methods. The characterization and test results confirm that PtCo alloy nanoparticles are evenly dispersed on carbon nanotubes, further dealloying and resulting in the partial dissolving of cobalt, simultaneously generating a rich Pt layer and roughly active surface. Benefiting from the unique structure, the SD-PtCo/CNT catalyst displays obviously enhanced HER activity in both acidic and alkaline conditions. In 1.0 M KOH, SD-PtCo/CNT exhibits a low overpotential of 78 mV at 10 mA/cm 2 and a small tafel slope (38.28 mV/dec). In 0.5 M H 2 SO 4 , SD-PtCo/CNT still shows the superior performance compared with un-dealloying PtCo/CNT, with an overpotential of 17 mV at 10 mA/cm 2 and corresponding tafel slope of 21.35 mV/dec. The high HER activity of SD-PtCo/CNT can be attributed to the formation of a platinum rich layer and the uniformly dispersed PtCo nanoparticles supported on superior conductive carbon nanotubes, suggesting its great potential for hydrogen generation via water splitting.

show abstract

Section: Materials Synthesis and Characterizationsupporting

confidence: 93%

Section: Materials Synthesis and Characterizationmentioning

confidence: 99%

Section: Electrocatalytic Her Performance Of Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface Roughed and Pt-Rich Bimetallic Electrocatalysts for Hydrogen Evolution Reaction

Wang

Yu²,

Feng³

et al. 2020

Front. Chem.

View full text Add to dashboard Cite

show abstract

“…The main idea is to form a specific nanostructure (similar to a core–shell structure) with a Pt-rich surface. To achieve this objective, selective acid etching and thermal treatment are usually adopted. − A new problem arises in which Pt–Co NPs tend to agglomerate at high temperatures. A coating method is adopted to limit the growth of NPs as the synthesis process becomes more complicated. , Introducing a third metal element, especially Au, to the Pt–Co system can also significantly enhance the long-term durability and mitigate the dissolution of Co. − The process of doping Au on the surface is usually carried out separately.…”

Section: Introductionmentioning

confidence: 99%

High-Loading Pt–Co/C Catalyst with Enhanced Durability toward the Oxygen Reduction Reaction through Surface Au Modification

Wang

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Carbon-supported Pt–Co (Pt–Co/C) nanoparticles with a high Pt loading are regarded as promising cathode catalysts for practical applications of proton exchange membrane fuel cells (PEMFCs). Unfortunately, with high loading, it is difficult to improve the catalytic durability while maintaining the particle size between 2 and 5 nm to ensure the initial catalytic activity. Thus, it is of great significance to prepare high-loading Pt–Co/C catalysts with enhanced activity and durability. Herein, we proposed an efficient way to prepare high-Pt-loading (>50 wt %) Pt–Co/C catalysts without using any further surfactants. Furthermore, due to the one-step selective acid etching and surface Au modification, the as-prepared catalysts only need to undergo thermal treatment at as low as 150 °C to achieve a surface structure rich of Pt and Au. The average particle size of the as-prepared Au–Pt–Co/C-0.015 is 3.42 nm, and the Pt loading of it is up to 50.2 wt %. The atomic ratio of Pt, Co, and Au is 94:5:1. The mass activity (MA) is nearly 1.9 times that of Pt/C (60 wt %, JM) and the specific activity is also improved. The MA loss after the 30,000-cycle accelerated degradation test (ADT) is only 9.4%. The remarkable durability is mainly due to the surface Au modification, which can restrict the dissolution of Pt and Co. This research provides an effective synthesis strategy to prepare high-loading carbon-supported Pt-based catalysts beneficial to practical PEMFC applications.

show abstract

Acetic acid‐assisted mild dealloying of fine CuPd nanoalloys achieving compressive strain toward high‐efficiency oxygen reduction and ethanol oxidation electrocatalysis

Liu

Rao

et al. 2023

Carbon Energy

View full text Add to dashboard Cite

Dealloying by which the transition metal is partially or completely leached from an alloy precursor is an effective way to optimize the fundamental effects for further enhancing the electrocatalysis of a catalyst. Herein, to address the deficiencies associated with the commonly used dealloying methods, for example, electrochemical and sulfuric acid/nitric acid treatment, we report an acetic acid-assisted mild strategy to dealloy Cu atoms from the outer surface layers of CuPd alloy nanoparticles to achieve high-efficiency electrocatalysis for oxygen reduction and ethanol oxidation in an alkaline electrolyte. The leaching of Cu atoms by acetic acid exerts an additional compressive strain effect on the surface layers and exposes more active Pd atoms, which is beneficial for boosting the catalytic performance of a dealloyed catalyst for the oxygen reduction reaction (ORR) and the ethanol oxidation reaction (EOR). In particular, for ORR, the CuPd nanoparticles with a Pd/Cu molar ratio of 2:1 after acetic dealloying show a half-wave potential of 0.912 V (vs. RHE) and a mass activity of 0.213 A mg Pd −1 at 0.9 V, respectively, while for EOR, the same dealloyed sample has a mass activity and a specific activity of 8.4 A mg −1 and 8.23 mA cm −2 , respectively, much better than their dealloyed counterparts at other temperatures and commercial Pd/C as well as a Pt/C catalyst.

show abstract

Dealloyed Pt3Co nanoparticles with higher geometric strain for superior hydrogen evolution reaction

Cited by 34 publications

References 62 publications

Surface Roughed and Pt-Rich Bimetallic Electrocatalysts for Hydrogen Evolution Reaction

Surface Roughed and Pt-Rich Bimetallic Electrocatalysts for Hydrogen Evolution Reaction

High-Loading Pt–Co/C Catalyst with Enhanced Durability toward the Oxygen Reduction Reaction through Surface Au Modification

Acetic acid‐assisted mild dealloying of fine CuPd nanoalloys achieving compressive strain toward high‐efficiency oxygen reduction and ethanol oxidation electrocatalysis

Contact Info

Product

Resources

About