Pt is the most efficient electrocatalyst for the hydrogen evolution reaction (HER); however, it is a high cost material with scarce resources. In order to balance performance and cost in a Pt-based electrocatalyst, we prepared a series of PtCu bimetallic nanoparticles (NPs) with different Pt/Cu ratios through a facile synthetic strategy to optimize the utilization of Pt atoms. PtCu NPs demonstrate a uniform particle size distribution with exposed (111) facets that are highly active for the HER. A synergetic effect between Pt and Cu leads to electron transfer from Pt to Cu, which is favorable for the desorption of H intermediates. Therefore, the as-synthesized carbon black (CB) supported PtCu catalysts showed enhanced catalytic performance in the HER compared with a commercial Pt/C electrocatalyst. Typically, PtCu/CB showed excellent HER performance, with only 10 mV (acid) and 17 mV (alkaline) overpotentials required to achieve a current density of 10 mA cm. This is because the PtCu NPs, with a small average particle size (7.70 ± 0.04 nm) and Pt-Cu core and Pt-rich shell structure, display the highest electrochemically active surface area (24.7 m g ) out of the as-synthesized PtCu/CB samples. Furthermore, PtCu/CB showed good electrocatalytic stability, with current density drops of only 9.3% and 12.8% in acidic solution after 24 h and in alkaline solution after 9 h, respectively. This study may shed new light on the rational design of active and durable hydrogen evolution catalysts with low amounts of Pt.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9037382 | PMC |
| http://dx.doi.org/10.1039/d1ra04001d | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
High-Pressure Neutron Diffraction Study on ε-FeOOH: The Spin-Reorientation Transition and Hydrogen-Bond Symmetrization.
J Am Chem Soc
January 2025
Department of Earth Science, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
The compression behavior of iron oxyhydroxide ε-FeOOH is complex, with variations in its magnetic property and bonding character. In this study, in situ powder neutron diffraction experiments were conducted on ε-FeOOH and ε-FeOOD up to pressures exceeding 20 GPa to investigate a spin-reorientation (spin-flop) transition, hydrogen-bond (H-bond) symmetrization, and their correlation. The magnetic transition was observed at 8 GPa in both ε-FeOOH and ε-FeOOD.
View Article and Find Full Text PDFA living library concept to capture the dynamics and reactivity of mixed-metal clusters for catalysis.
Nat Chem
January 2025
TUM School of Natural Sciences, Department of Chemistry, Chair of Inorganic and Metal-Organic Chemistry and Catalysis Research Center, Technical University of Munich, Garching, Germany.
The exploration of ligated metal clusters' chemical space is challenging, partly owing to an insufficiently targeted access to reactive clusters. Now, dynamic mixtures of clusters, defined as living libraries, are obtained through organometallic precursor chemistry. The libraries are populated with interrelated clusters, including transient and highly reactive ones, as well as more accessible but less reactive species.
View Article and Find Full Text PDFChanges in the intestinal microbiota induced by the postnatal environment and their association with hypertension.
Pharmacol Res
January 2025
Laboratory of Vascular Physiology, Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo, Brazil. Electronic address:
It has been established that cross-fostering impacts the development of hypertension in spontaneously hypertensive rats (SHR). However, the ability of the cross-fostering protocol to shape gut microbiota profile in SHR and impact hypertension is not known. In this sense, the current study explored the influence of normotensive and hypertensive postnatal environments on the intestinal microbiota structure, composition, and functional capacity of SHR and Wistar rats.
View Article and Find Full Text PDFEngineering active sites on N, S co-doped carbon matrix-encapsulated Ni-modified CoS nanoparticles enabling efficient urea electrooxidation.
J Colloid Interface Sci
January 2025
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004 PR China.
Interface engineering and electronic modulation enable precise tuning of the electronic structure, thereby maximizing the efficacy of active sites and significantly enhancing the activity and stability of the electrocatalyst. Herein, a hybrid material composed of Ni-modified CoS nanoparticles ((Co, Ni)S) encapsulated within an N, S co-doped carbon matrix (SNC) and anchored onto S-doped carbonized wood fibers (SCWF) is synthesized using a straightforward simultaneous carbonization and sulfidation approach. Density functional theory (DFT) calculations reveal that the highly electronegative Ni element promotes electron cloud migration from Co to Ni, shifting the d-band center of Co closer to the Fermi level.
View Article and Find Full Text PDFSynergistic design of dual S-scheme heterojunction CuO/NiAl-LDH@MIL-53(Fe) for boosting photocatalytic hydrogen evolution.
J Colloid Interface Sci
January 2025
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164 PR China.
The development of heterojunctions is a proven strategy to augment the photocatalytic efficiency of materials. However, the enhancement in charge transfer facilitated by a single heterojunction is inherently constrained. To overcome these limitations, we synthesized a dual S-scheme heterojunction ternary composite photocatalyst, CuO/NiAl-LDH@MIL-53(Fe), designed for efficient visible-light-driven hydrogen (H) production.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!