Defect-density control of platinum-based nanoframes with high-index facets for enhanced electrochemical properties

Yang, Shaohan; Li, Shuna; Song, Lianghao; Lv, Yipin; Duan, Zhongyao; Li, Chunsheng; Praeg, Raphael Francesco; Gao, Daowei; Chen, Guozhu

doi:10.1007/s12274-019-2530-5

Cited by 26 publications

(9 citation statements)

References 44 publications

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“…Moreover, the slight lattice distortion also presents in S5, which is not observed in the HRTEM image of S0 (Figure S4a). 36 This shows that these lattice distortions are caused by acid etching affecting the original atomic arrangement. Changes in the atomic arrangement of the catalyst affect its electronic structure and then the position of ε d .…”

Section: ■ Results and Discussionmentioning

confidence: 96%

Regulation of d-Band Electrons to Enhance the Activity of Co-Based Non-Noble Bimetal Catalysts for Hydrolysis of Ammonia Borane

Wang

et al. 2020

ACS Sustainable Chem. Eng.

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The catalytic activity of the catalyst closely depends on its electronic structure, but the relationship between electronic structure and the catalytic activity in the ammonia borane (NH3BH3, AB) catalyzed hydrolysis reaction is still unclear. Here, we prepared Co-based non-noble metal (Fe, Ni, Cu, and Zn) alloy nanoparticles (NPs) and determined the electronic structure by a valence band spectrum (VBS) obtained from X-ray photoelectron spectrometer (XPS) measurement and theoretical calculations. The relationship of the d-band center (εd) and activity exhibits volcano-shape behaviors. The activity of CoCu alloys is superior to other metals, which is due to the electronic structure affecting the adsorption and desorption behavior of water in the hydrolysis reaction. The acid etching method formed SCoCu with different Cu content, and the coexistence of surface defects made the εd further regulated. These results provide new insights into the relationship between the electronic structure of the catalyst and its catalytic AB hydrolysis activity.

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Section: ■ Results and Discussionmentioning

confidence: 96%

Regulation of d-Band Electrons to Enhance the Activity of Co-Based Non-Noble Bimetal Catalysts for Hydrolysis of Ammonia Borane

Wang

et al. 2020

ACS Sustainable Chem. Eng.

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“…A ternary alloy of CuFePt (1:1:1 ratio), prepared by a one‐pot synthesis, performed better than the binary CuPt/rGO and FePt/rGO as well as the monometallic Pt in terms of activity and stability (X. Zhang, Zhang, et al, 2015). Trimetallic PtCuCo hexapod nanoframes prepared by a microwave‐assisted technique exhibited excellent activity toward FAEO, possibly due to a synergistic effect, including a high density of defects and high‐index facets and the open‐framework structure of the nanoframes (S. Yang, Li, et al, 2019).…”

Section: Anode Electrocatalystsmentioning

confidence: 99%

Recent advances in electrocatalysts, mechanism, and cell architecture for direct formic acid fuel cells

Bhaskaran

Abraham²,

Chetty³

2021

WIREs Energy & Environment

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Direct formic acid fuel cells (DFAFCs) are potential candidates as power sources for various applications, especially in portable electronics and medical diagnostic devices. Though they have been the subject of considerable research, commercial prototypes of DFAFCs are rudimentary compared to other liquid fuel cells, particularly the widespread methanol‐based direct methanol fuel cells. Various strategies for rationally engineering the electrocatalysts for enhancing DFAFC performance have been explored in the last few years, such as alloying noble metals with earth‐abundant transition metals, designing specific morphological and structural arrangements, decorating the surface with corrosion‐tolerant cocatalysts, and providing better catalyst support for effective catalyst dispersion. An overall approach may be necessary and should include (i) understanding the underlying mechanism, which will guide the direction of catalyst engineering, (ii) employing morphological, compositional, and structural control of the electrocatalysts to improve catalyst utilization and enhance the intrinsic activity for real‐world applications, and (iii) integrating these in a proficiently designed cell architecture suitable for targeted applications. In this review, we focus on the recent advances in electrocatalysts, formic acid electrooxidation mechanisms, and DFAFC cell architectures, which could help address the opportunities and challenges of commercializing DFAFC as a prospective alternative power source for portable applications. This article is categorized under: Fuel Cells and Hydrogen > Science and Materials Energy Research & Innovation > Science and Materials

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“…High atomic utilization, open space structure and large specific surface areas along with high-index facets of vertexreinforced structure facilitate efficient mass transport and electron transfer in electrocatalysis for the improved EOR (Fig. 8f, g) [103][104][105] . Compared with PtCu nanocrystals and PtCuRh nanoparticles, vertex-reinforced PtCuRh NFs achieve an enhanced current density due to more active sites and coordination options.…”

Section: Ethanol Oxidation Reactionmentioning

confidence: 99%

Synthesis and Application of Platinum-based Hollow Nanoframes for Direct Alcohol Fuel Cells

Huang¹,

Zaman²,

Wang³

et al. 2020

Acta Physico Chimica Sinica

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Although platinum (Pt)-based catalysts are suffering from high costs and limited reserves, they are still irreplaceable in a short period of time in terms of catalytic performance. Structural optimization, composition regulation and carrier modification are the common strategies to improve the activity and stability of Pt-based catalyst. Strikingly, the morphological evolution of Pt-based electrocatalyst into nanoframes (NFs) have attracted wide attention to reduce the Pt consumption and improve the electrocatalytic activity simultaneously. Contrary to Pt-based solid nanocrystalline materials, Pt-based NFs have many advantages in higher atomic utilization, open space structure and larger specific surface area, which facilitate electron transfer, mass transport and weaken surface adsorption by more unsaturated coordination sites. Here we introduce the detailed preparation strategies of Pt-based NFs with different etching methods (oxidative etching, chemical etching, galvanic replacement and carbon monoxide etching), crystal structure evolution and formation mechanism, efficient applications for oxygen reduction reaction (ORR), methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR) in direct alcohol fuel cells (DAFCs). Based on the high-efficiency atom utilization, open space structure and diverse alloy composition, Pt-based NFs exhibit superior activity, stability and anti-poisoning than commercial counterparts in the application of DAFCs. The current challenges and future development of Pt-based NFs are prospected on the type of NFs materials, synthesis and etching methods, crystal control and catalytic performance. We propose a series of improvement mechanisms of Pt-based NFs, such as small size effect, high-energy facets, Pt-skin construction and Pt-C integration, thereby weakening the molecule absorption, increasing the Pt utilization, strengthening the intrinsic stability, and alleviating the metal dissolution and support corrosion. Additionally, the scale-up synthesis of catalytic materials, membrane electrodes assembly, and development of the start-stop system and the circulation system design are essential for the commercial application of Pt-based NFs and industrial manufacturing of DAFCs. More importantly, the reaction mechanism, active site distribution and dynamic changes in the catalytic material during the catalytic reaction are crucial to further explain the maintenance and evolution of catalytic performance, which will open a window to elucidate the improvement mechanism of the catalyst in the fuel cell reactions. This review work would promote continuous upgradations and understandings on Pt-based NFs in the future development of DAFCs.

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Defect-density control of platinum-based nanoframes with high-index facets for enhanced electrochemical properties

Cited by 26 publications

References 44 publications

Regulation of d-Band Electrons to Enhance the Activity of Co-Based Non-Noble Bimetal Catalysts for Hydrolysis of Ammonia Borane

Regulation of d-Band Electrons to Enhance the Activity of Co-Based Non-Noble Bimetal Catalysts for Hydrolysis of Ammonia Borane

Recent advances in electrocatalysts, mechanism, and cell architecture for direct formic acid fuel cells

Synthesis and Application of Platinum-based Hollow Nanoframes for Direct Alcohol Fuel Cells

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