The mechanism study of oxygen reduction reaction (ORR) on non-equivalent P, N co-doped graphene

Han, Chuan; Chen, Zhenqian

doi:10.1016/j.apsusc.2020.145382

Cited by 52 publications

(24 citation statements)

References 73 publications

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“…Further, it may be noted that N and P atoms in the N, P-g system can have many different orientations and ratios than what has been considered in this work. Recently, Chen et al, [63] showed the favorable formation of oPN 3 -g, which is expected to increase the catalytic activity of the CrP surface as out of plane N atoms in the ortho position of P helps in increasing the electron depletion in the CrP. To understand the charge separation and the role of N/ P dopant in graphene, Bader charge calculations were done for all differently considered NP-g hybrids (Table S4, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Interfacial Electron Transfer Strategy to Improve the Hydrogen Evolution Catalysis of CrP Heterostructure

Sarkar

Parui

Das

et al. 2022

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Though several Pt‐free hydrogen evolution reaction (HER) catalysts have been reported, their employment for industry is challenging. Here, a facile pyrolysis method to obtain phase‐pure CrP nanoparticles supported on N, P dual‐doped carbon (CrP/NPC) is reported to be tuned toward industrial HER. Interestingly, CrP/NPC exhibits excellent HER activity that requires an overpotential of 34 mV to attain a current density of 10 mA cm−2, which is only 1 mV positive to commercial Pt/C and a potential of 55 mV to achieve a current density of 200 mA cm−2 which is better than Pt/C. In addition, the long‐term durability of CrP/NPC is far superior to Pt/C due to the strong interaction between CrP and C support, restricting any agglomeration or leaching. Density functional theory (DFT) calculations suggest that electronic modulation at the interface (CrP/NPC) optimizes the hydrogen adsorption energy. The Cr–Cr bridge site with required density of states near the Fermi level is found to be the active site. Overall, this report provides a practical scheme to synthesize rarely investigated CrP based materials along with a computational mechanistic guideline for electrocatalysis that can be utilized to explore other phosphides for various applications.

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Section: Resultsmentioning

confidence: 99%

Interfacial Electron Transfer Strategy to Improve the Hydrogen Evolution Catalysis of CrP Heterostructure

Sarkar

Parui

Das

et al. 2022

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“…To clarify the real active sites in P, N-graphene, the theoretical works were conducted [ 88 , 112 , 113 ]. As shown in Figure 7 , the free energy of different P-containing structures for ORR are calculated by DFT simulation.…”

Section: Phosphorus-doped Graphene For Metal-free Orr Electrocatalystmentioning

confidence: 99%

Phosphorus-Doped Graphene Electrocatalysts for Oxygen Reduction Reaction

Zhan

Tong

et al. 2022

Nanomaterials

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Developing cheap and earth-abundant electrocatalysts with high activity and stability for oxygen reduction reactions (ORRs) is highly desired for the commercial implementation of fuel cells and metal-air batteries. Tremendous efforts have been made on doped-graphene catalysts. However, the progress of phosphorus-doped graphene (P-graphene) for ORRs has rarely been summarized until now. This review focuses on the recent development of P-graphene-based materials, including the various synthesis methods, ORR performance, and ORR mechanism. The applications of single phosphorus atom-doped graphene, phosphorus, nitrogen-codoped graphene (P, N-graphene), as well as phosphorus, multi-atoms codoped graphene (P, X-graphene) as catalysts, supporting materials, and coating materials for ORR are discussed thoroughly. Additionally, the current issues and perspectives for the development of P-graphene materials are proposed.

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“…The four-electron pathway directly reduces oxygen to water, while the two-electron pathway has hydrogen peroxide as the intermediate of the reaction. The four-electron pathway is obviously preferable to the two-electron pathway with the reaction intermediate hydrogen peroxide, and the path used for the specific catalyst depends on the type of catalyst [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Nanosheets with High-Performance Electrochemical Oxygen Reduction Reaction Revived from Green Walnut Peel

2022

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The synthesis of metal-free carbon-based electrocatalysts for oxygen reduction reactions (ORR) to replace conventional Pt-based catalysts has become a hot spot in current research. This work proposes an activation-assisted carbonization strategy, to manufacture N-doped ultra-thin carbon nanosheets (GWS180M800) with high catalytic activity, namely, melamine is used as an accelerator/nitrogen source, and walnut green peels biological waste as a carbon source. The melamine acts as a nitrogen donor in the hydrothermal process, effectively enhancing the nitrogen doping rate. The content of pyridine nitrogen groups accounts for up to 48.5% of the total nitrogen content. Electrochemical tests show that the GWS180M800 has excellent ORR electrocatalytic activity and stability, and makes a quasi-four-electron ORR pathway clear in the alkaline electrolyte. The initial potential and half slope potential are as high as 1.01 and 0.82 V vs. RHE, respectively. The GWS180M800 catalyst has a better ability to avoid methanol cross poisoning than Pt/C has. Compared with 20 wt% Pt/C, GWS180M800 has improved methanol tolerance and stability. It is a metal-free biochar ORR catalyst with great development potential and application prospects. This result provides a new space for the preparation of valuable porous nano-carbon materials based on carbonaceous solid waste and provides new ideas for catalyzing a wide range of electrochemical reactions in the future.

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The mechanism study of oxygen reduction reaction (ORR) on non-equivalent P, N co-doped graphene

Cited by 52 publications

References 73 publications

Interfacial Electron Transfer Strategy to Improve the Hydrogen Evolution Catalysis of CrP Heterostructure

Interfacial Electron Transfer Strategy to Improve the Hydrogen Evolution Catalysis of CrP Heterostructure

Phosphorus-Doped Graphene Electrocatalysts for Oxygen Reduction Reaction

Nanosheets with High-Performance Electrochemical Oxygen Reduction Reaction Revived from Green Walnut Peel

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