Surface nitridation of nickel-cobalt alloy nanocactoids raises the performance of water oxidation and splitting

Gao, Xiaorui; Yu, Yong; Liang, Qirui; Pang, Yajun; Miao, Linqing; Liu, Ximeng; Kou, Zongkui; He, Jiaqing; Pennycook, Stephen J.; Mu, Shichun; Wang, John

doi:10.1016/j.apcatb.2020.118889

Cited by 109 publications

(72 citation statements)

References 46 publications

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“…The two peaks located at 781.9 and 798.0 eV correspond to oxidized Co species in air. [30] Likewise, as shown in Figure 1e, the two small peaks located at 707.2 and 720.5 eV are ascribed to the Fe 2p 3/2 and Fe 2p 1/2 of Fe-P, respectively. The peaks at 711.1 and 726.7 eV result from the oxide of Fe due to exposed to air.…”

Section: Catalysts Characterizationmentioning

confidence: 66%

Preparation of Hollow Cobalt–Iron Phosphides Nanospheres by Controllable Atom Migration for Enhanced Water Oxidation and Splitting

Chen

Zhang

Liu

et al. 2021

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Transition metal phosphides (TMPs), especially the dual‐metal TMPs, are highly active non‐precious metal oxygen evolution reaction (OER) electrocatalysts. Herein, an interesting atom migration phenomenon induced by Kirkendall effect is reported for the preparation of cobalt–iron (Co–Fe) phosphides by the direct phosphorization of Co–Fe alloys. The compositions and distributions of the Co and Fe phosphides phases on the surfaces of the electrocatalysts can be readily controlled by CoxFey alloys precursors and the phosphorization process with interesting atom migration phenomenon. The optimized Co7Fe3 phosphides exhibit a low overpotential of 225 mV at 10 mA cm−2 in 1 m KOH alkaline media, with a small Tafel slope of 37.88 mV dec−1 and excellent durability. It only requires a voltage of 1.56 V to drive the current density of 10 mA cm−2 when used as both anode and cathode for overall water splitting. This work opens a new strategy to controllable preparation of dual‐metal TMPs with designed phosphides active sites for enhanced OER and overall water splitting.

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Section: Catalysts Characterizationmentioning

confidence: 66%

Preparation of Hollow Cobalt–Iron Phosphides Nanospheres by Controllable Atom Migration for Enhanced Water Oxidation and Splitting

Chen

Zhang

Liu

et al. 2021

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“…Bimetallic alloying has been employed to alter such weak metal–carbon interaction into synergistic metal–metal interaction, thereby optimizing the electronic structure of monometals and accordingly, promoting the catalytic activity. [ 28,29 ] Notwithstanding these advances, few studies have attempted to explore bimetallic alloying electrocatalyst toward polysulfide management, where persuasive electrochemical investigation and systematic mechanism probing are still lacking. [ 30 ] In further contexts, unlike the extensive attention focused on the liquid–solid polysulfide conversion process, barely no effort has been exerted on studying Li 2 S/Li 2 S 2 oxidation kinetics.…”

Section: Introductionmentioning

confidence: 99%

Boosting Dual‐Directional Polysulfide Electrocatalysis via Bimetallic Alloying for Printable Li–S Batteries

Shi

Sun

Cai

et al. 2020

Adv Funct Materials

113

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The rational design of electrocatalyst has readily stimulated a burgeoning interest in expediting polysulfide conversion and hence essentially restricting the “shuttle effect” in Li–S systems. Nevertheless, seldom efforts have been devoted to probing the dual‐directional polysulfide electrocatalysis to date. Herein, a CoFe alloy decorated mesoporous carbon sphere (CoFe‐MCS) serving as a promising mediator for Li–S batteries is reported. Such bimetallic alloying boosts dual‐directional electrocatalytic activity toward effective polysulfide conversion throughout detailed electroanalytic characterization, theoretical calculation, and operando instrumental probing. Accordingly, the S@CoFe‐MCS cathode harvests a stable cycling with a low capacity decay rate of 0.062% per cycle over 500 cycles at 2.0 C. More encouragingly, benefiting from the optimized redox kinetics and delicate grid architecture, printable S@CoFe‐MCS cathode achieves an excellent rate performance at a sulfur loading of 4.0 mg cm−2 and advanced areal capacity of 6.0 mAh cm−2 at 7.7 mg cm−2. This work explores non‐precious metal alloy electrocatalysts in printable cathodes toward dual‐directional polysulfide conversion, holding great potential in the pursuit of Li–S commercialization.

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“…Specifically, the Raman peak appears at 530 cm −1 , which matches the characteristics of M-OOH. [46,53] This shows that the metal hydroxyl oxide site is the active site of AQS/S during OER. The formation of active sites M-OOH is owing to the following equations (Equations (S9)-(S10); i.e., under alkaline conditions, Ni 3 S 2 transforms into Ni (OH) 2 , then Ni (OH) 2 transforms into Ni-OOH).…”

Section: Electrocatalytic Mechanismmentioning

confidence: 96%

3D‐Stretched Film Ni₃S₂ Nanosheet/Macromolecule Anthraquinone Derivative Polymers for Electrocatalytic Overall Water Splitting

Chen

Jiang

et al. 2021

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Transition metal sulfide (TMSs) has been one of the most promi sing candidate materials to replace noble metals for OWS because of advantages such as costeffectiveness, abundance, facile fabrication, among others. [4][5][6] How ever, the poor conductivity and stability of TMSs based electrocatalysts hinder their practical application in largescale sustain able hydrogen production.Composite engineering is an excellent strategy to raise the catalytic performance of TMSs further, [7,8] and the composite of TMSs and carbon materials has attracted much attention due to their superior sta bility and conductivity. Carbon materials with macrocyclic frameworks, graphite and graphitelike structures have been widely studied. [2,9,10] Because of the chem ical stability, thermal stability and highly adjustable photoelectric properties, as carriers of catalyst, this kind of carbon material have been used for electrochemical applications such as OWS, oxygen evolution reaction (OER), carbon dioxide reduction, and hydrogen evolution reaction (HER). [11,12] The study also shows that the macrocyclic carbon framework material enhances the crystallization ability of ZIF 8, [13] which solves the problem of low crystallinity of metal organic frameworks prepared by traditional benzene derivatives (BZD). As a significant natural and synthetic compound with a macrocyclic skeleton structure, anthraquinone derivatives For the first time, a new polymer electrode AQS/S is prepared by compositing Ni 3 S 2 nanosheets and macromolecular anthraquinone derivative (AQD) supported on nickel foam with flying colors. The AQS/S exhibits high crystalline structure and abundant S defects. Density of state calculation shows that AQD has stable internal bonding and easy external bonding with metals, conducive to the dispersion of metal reaction sites, ensuring excellent activity and high stability. Under 1.0 m KOH solution, ultralow overpotentials of 62 and 133 mV at 10 mA cm −2 on AQS/S for hydrogen evolution reaction and on activated AQS/S (A-AQS/S) for oxygen evolution reaction, respectively, are achieved. 100 h chronopotentiometry and the cyclic voltammetry tests show that catalysts have high durability. The AQS/S‖A-AQS/S two-electrode system is also found to have good electrocatalytic activity for 1.43 V to get 10 mA cm −2 in overall water splitting, better than the state-of-the-art 20% Pt/C‖RuO 2 combination.

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Surface nitridation of nickel-cobalt alloy nanocactoids raises the performance of water oxidation and splitting

Cited by 109 publications

References 46 publications

Preparation of Hollow Cobalt–Iron Phosphides Nanospheres by Controllable Atom Migration for Enhanced Water Oxidation and Splitting

Preparation of Hollow Cobalt–Iron Phosphides Nanospheres by Controllable Atom Migration for Enhanced Water Oxidation and Splitting

Boosting Dual‐Directional Polysulfide Electrocatalysis via Bimetallic Alloying for Printable Li–S Batteries

3D‐Stretched Film Ni₃S₂ Nanosheet/Macromolecule Anthraquinone Derivative Polymers for Electrocatalytic Overall Water Splitting

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Surface nitridation of nickel-cobalt alloy nanocactoids raises the performance of water oxidation and splitting

Cited by 109 publications

References 46 publications

Preparation of Hollow Cobalt–Iron Phosphides Nanospheres by Controllable Atom Migration for Enhanced Water Oxidation and Splitting

Preparation of Hollow Cobalt–Iron Phosphides Nanospheres by Controllable Atom Migration for Enhanced Water Oxidation and Splitting

Boosting Dual‐Directional Polysulfide Electrocatalysis via Bimetallic Alloying for Printable Li–S Batteries

3D‐Stretched Film Ni3S2 Nanosheet/Macromolecule Anthraquinone Derivative Polymers for Electrocatalytic Overall Water Splitting

Contact Info

Product

Resources

About

3D‐Stretched Film Ni₃S₂ Nanosheet/Macromolecule Anthraquinone Derivative Polymers for Electrocatalytic Overall Water Splitting