Concave octahedral Pd@PdPt electrocatalysts integrating core–shell, alloy and concave structures for high-efficiency oxygen reduction and hydrogen evolution reactions

Liu, Ying; Liu, Suli; Che, Zhiwen; Zhao, Shuchen; Sheng, Xuexi; Han, Min; Bao, Jianchun

doi:10.1039/c6ta07124d

Cited by 74 publications

(43 citation statements)

References 55 publications

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“…These peaks are slightly shifted to higher angles relative to the pure Pd (JCPDS no. 87–0641) indicating the formation of an alloyed nanostructure . A broad peak observed at around ∼25° is ascribed to the (002) reflection of a hexagonal structure in Vulcan XC‐72R carbon.…”

Section: Resultsmentioning

confidence: 98%

Unique Half Embedded/Exposed PdFeCu/C Interfacial Nanoalloy as High‐Performance Electrocatalyst for Oxygen Reduction Reaction

et al. 2019

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Design of high‐performance non‐Pt electrocatalyst for fuel cell applications is greatly anticipated. Herein, we have developed a unique half‐embedded and half‐exposed interfacial PdFeCu nanoalloy anchored onto carbon matrix. The stable electronic coupling between the carbon matrix and PdFeCu nanoalloy possess very fast interfacial electron transfer which in turn enhances the electron conductivity. This makes the trimetallic nanoalloy high performing oxygen reduction reaction (ORR) electrocatalyst in both basic and acidic media. The PdFeCu/C nanoalloy exhibits enhanced electrochemically active surface area than various PdFe/C bimetallics as well as benchmark 20 wt% Pt/C and Pd/C. As a result, it offers larger active sites for ORR and eased the electron transport during the electrocatalysis. It exhibits 1.5‐ and 2.4‐fold higher mass activity in comparison to the Pt/C and Pd/C. Furthermore, it exhibits long‐term stability and low onset potential compared to those of the other catalysts. Thus, the present investigation shows potential strategy for the design and synthesis of Pt‐free electrocatalyst with remarkable catalytic activity and stability.

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Section: Resultsmentioning

confidence: 98%

Unique Half Embedded/Exposed PdFeCu/C Interfacial Nanoalloy as High‐Performance Electrocatalyst for Oxygen Reduction Reaction

et al. 2019

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“…However, this second assumption is not necessary and some authors use the CHE in conjunction with solvation effects. 91,92 A lot of DFT-based research in electrocatalysis studies relies on the CHE approach as a tool to design the catalytic activities of different materials, 47,49,93,94 determine phase diagrams 95 and estimate the free energy of various electroreduction and electrooxidation reactions such as the oxygen reduction reaction, 96 the oxygen evolution reaction, 97 the HER, [98][99][100] the CO 2 reduction reaction, [101][102][103] and the N 2 reduction reaction. 104,105 Despite these exploitable results, CHE has several limitations and unanswered questions remain related to the approximations in establishing the model.…”

Section: The Che Revolutionmentioning

confidence: 99%

“…A lot of DFT‐based research in electrocatalysis studies relies on the CHE approach as a tool to design the catalytic activities of different materials, 47,49,93,94 determine phase diagrams 95 and estimate the free energy of various electroreduction and electrooxidation reactions such as the oxygen reduction reaction, 96 the oxygen evolution reaction, 97 the HER, 98–100 the CO 2 reduction reaction, 101–103 and the N 2 reduction reaction 104,105 …”

Section: Approaches To Model the Electrified Interfacementioning

confidence: 99%

Atomistic modeling of electrocatalysis: Are we there yet?

Abidi

Lim

Seh

et al. 2020

WIREs Comput Mol Sci

103

107

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Electrified interfaces play a prime role in energy technologies, from batteries and capacitors to heterogeneous electrocatalysis. The atomistic understanding and modelling of these interfaces is challenging due to the structural complexity and the presence of the electrochemical potential. Including the potential explicitly in the quantum mechanical simulations is equivalent to simulating systems with a surface charge. For realistic relationships between the potential and the surface charge (i.e., the capacity), the solvent and counter charge need to be considered. The solvent and electrolyte description are limited by the computational power: either molecules and ions are included explicitly, but the phase-space sampling is at least 10 times too small to reach convergence or implicit solvent and electrolyte descriptions are adopted which suffer from a lack of realism. Both approaches suffer from a lack of validation against directly comparable experimental data. Furthermore, the limitations of density functional theory in terms of accuracy are critical for these metal/liquid interfaces. Nevertheless, the atomistic insight in electrocatalytic interfaces allow insights with unprecedented details. The joint theoretical and experimental efforts to design non-noble hydrogen evolution catalysts are discussed as an example for the success of theory to spur and accelerate experimental discoveries.

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“…the as-prepared concave octahedral Pd@PdPt showed excellent catalytic properties. [16] Holade et al investigated the impact of reducing agentso nP d-based catalysts for ORR by using NaBH 4 and l-ascorbic acid (AA). [17] Among the various reducing agents, AA is one of the ideal choices, as it is biological, environmentally friendly,a nd easily removable.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of a Porous Pd/Cu Alloy and its Enhanced Performance toward Methanol and Formic Acid Electrooxidation

Yan

Wang

et al. 2017

ChemPlusChem

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Reported is a porous Pd/Cu alloy catalyst synthesized by a one‐pot method, in which the Pd/Cu alloy is formed by using l‐ascorbic acid as reducing agent to simultaneously reduce the copper precursor and the palladium precursor. The copper incorporated with Pd can reduce the cost of the catalyst and enhance the catalytic performance. The morphology of the Pd/Cu alloy catalyst can be controlled by altering the ratios of Pd to Cu. Electrochemical characterizations indicate that Pd/Cu alloy catalysts possess good activity and long‐term stability for the electrooxidation of methanol and formic acid. Compared with commercial Pd/C, the as‐prepared Pd65Cu35 shows enhanced activities of electrooxidation of methanol and formic acid. This study highlights an easy strategy to obtain the shape‐controlled Pd/Cu alloyed catalysts and their potential application as electrocatalysts in fuel cells or other fields.

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Concave octahedral Pd@PdPt electrocatalysts integrating core–shell, alloy and concave structures for high-efficiency oxygen reduction and hydrogen evolution reactions

Abstract: A unique Pd@PdPt electrocatalyst that integrates three structural types, core–shell, concave and alloy, exhibits remarkable enhanced ORR and HER bifunctionality.

Cited by 74 publications

References 55 publications

Unique Half Embedded/Exposed PdFeCu/C Interfacial Nanoalloy as High‐Performance Electrocatalyst for Oxygen Reduction Reaction

Unique Half Embedded/Exposed PdFeCu/C Interfacial Nanoalloy as High‐Performance Electrocatalyst for Oxygen Reduction Reaction

Atomistic modeling of electrocatalysis: Are we there yet?

Facile Synthesis of a Porous Pd/Cu Alloy and its Enhanced Performance toward Methanol and Formic Acid Electrooxidation

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