Hierarchical CoNi‐Sulfide Nanosheet Arrays Derived from Layered Double Hydroxides toward Efficient Hydrazine Electrooxidation

Zhou, Lei; Shao, Mingfei; Zhang, Cong; Zhao, Jingwen; He, Song; Rao, D. Krishna; Wei, Min; Evans, David G.; Duan, Xue

doi:10.1002/adma.201604080

Cited by 211 publications

(129 citation statements)

References 45 publications

Supporting

Mentioning

124

Contrasting

Order By: Relevance

“…Small molecule electrooxidation reaction (e.g., methanol, ethanol, hydrazine, formic acid, and glucose) is the heart process of direct liquid fuel cells, such as direct alcohol fuel cells, direct hydrazine hydrate fuel cells, and glucose biofuel cells, thus receiving tremendous attention 122–125. However, the efficient oxidation of small molecules is still impeded by the high overpotential.…”

Section: Electrocatalysis Application Of 2d Nanomaterialsmentioning

confidence: 99%

Confined Synthesis of 2D Nanostructured Materials toward Electrocatalysis

Zhang

Cheng

et al. 2019

Advanced Energy Materials

Self Cite

155

View full text Add to dashboard Cite

2D nanostructured materials have shown great application prospects in energy conversion, owing to their unique structural features and fascinating physicochemical properties. Developing efficient approaches for the synthesis of well‐defined 2D nanostructured materials with controllable composition and morphology is critical. The emerging concept, confined synthesis, has been regarded as a promising strategy to design and synthesize novel 2D nanostructured materials. This review mainly summarizes the recent advances in confined synthesis of 2D nanostructured materials by using layered materials as host matrices (also denoted as “nanoreactors”). By virtue of the space‐ and surface‐confinement effects of these layered hosts, various well‐organized 2D nanostructured materials, including 2D metals, 2D metal compounds, 2D carbon materials, 2D polymers, 2D metal‐organic frameworks (MOFs) and covalent‐organic frameworks (COFs), as well as 2D carbon nitrides are successfully synthesized. The wide employment of these 2D materials in electrocatalytic applications (e.g., electrochemical oxygen/hydrogen evolution reactions, small molecule oxidation, and oxygen reduction reaction) is presented and discussed. In the final section, challenges and prospects in 2D confined synthesis from the viewpoint of designing new materials and exploring practical applications are commented, which would push this fast‐evolving field a step further toward greater success in both fundamental studies and ultimate industrialization.

show abstract

Section: Electrocatalysis Application Of 2d Nanomaterialsmentioning

confidence: 99%

Confined Synthesis of 2D Nanostructured Materials toward Electrocatalysis

Zhang

Cheng

et al. 2019

Advanced Energy Materials

Self Cite

155

View full text Add to dashboard Cite

show abstract

“…[28][29][30] In addition, to properly make use of the intrinsic advantage of BSs, a novel fabrication approach is to directly grow the electrically conductive BSs on N-doped carbon materials (BSs@NMSs), which would ensure with a better contact with the conductive matrix. This will be in contrast to those processes completed at high hydrothermal temperatures [28,29,31,32] or chemical vapor deposition (CVD; they are usually higher than 600 °C), [33,34] which are tedious and time consuming. This will be in contrast to those processes completed at high hydrothermal temperatures [28,29,31,32] or chemical vapor deposition (CVD; they are usually higher than 600 °C), [33,34] which are tedious and time consuming.…”

Section: Introductionmentioning

confidence: 99%

CuCo₂S₄ Nanosheets@N‐Doped Carbon Nanofibers by Sulfurization at Room Temperature as Bifunctional Electrocatalysts in Flexible Quasi‐Solid‐State Zn–Air Batteries

et al. 2019

View full text Add to dashboard Cite

The performance of quasi‐solid‐state flexible zinc–air batteries (ZABs) is critically dependent on the advancement of air electrodes with outstanding bifunctional electrocatalysis for both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), together with the desired mechanical flexibility and robustness. The currently available synthesis processes for high‐efficiency bifunctional bimetallic sulfide electrodes typically require high‐temperature hydrothermal or chemical vapor deposition, which is undesirable in terms of the complexity in experimental procedure and the damage of flexibility in the resultant electrode. Herein, a scalable fabrication process is reported by combining electrospinning with in situ sulfurization at room temperature to successfully obtain CuCo 2 S 4 nanosheets@N‐doped carbon nanofiber (CuCo 2 S 4 NSs@N‐CNFs) films, which show remarkable bifunctional catalytic performance ( E j = 10 (OER) – E 1/2 (ORR) = 0.751 V) with excellent mechanical flexibility. Furthermore, the CuCo 2 S 4 NSs@N‐CNFs cathode delivers a high open‐circuit potential of 1.46 V, an outstanding specific capacity of 896 mA h g −1 , when assembled into a quasi‐solid‐state flexible ZAB together with Zn NSs@carbon nanotubes (CNTs) film (electrodeposited Zn nanosheets on CNTs film) as the anode. The ZAB also shows a good flexibility and capacity stability with 93.62% capacity retention (bending 1000 cycles from 0° to 180°), making it an excellent power source for portable and wearable electronic devices.

show abstract

“…X-ray photoelectron spectroscopy (XPS) was used to understand the reason for the OER activity enhancement observed with W 0.5 Co 0.5Àx Fe x trimetallic oxyhydroxides.F igure 5a shows the Co 2p spectra of various W 0.5 Co 0.5Àx Fe x oxyhydroxides.T he fitting analysis revealed the coexistence of Co 2+ and Co 3+ as the peaks at 798.1 and 782.4 eV correspond to Co 2+ 2p 1/2 and Co 2+ 2p 3/2 ,a nd the peaks at 796.6 and 780.7 eV belong to Co 3+ 2p 1/2 and Co 3+ 2p 3/2 , respectively,while the peaks located at 786.2 eV and 803.0 eV are satellite peaks. [5,48] As shown in Figure 5b,the Co 2+ /Co 3+ molar ratio increases with the addition of Fe,i ndicating electron transfer from Fe to Co,a nd Fe may inhibit the oxidation of Co. [49] However, for W 0.5 Co 0.3 Fe 0.2 ,the Co 2+ /Co 3+ molar ratio suddenly decreases,w hich is likely due to the formation of aseparate Fe phase for large Fe contents. [50] The volcano-like change in the Co 2+ /Co 3+ molar ratio as afunction of the amount of Fe is in good agreement with the trends in the OER activity (Figure 5c), suggesting that the on average lower Co oxidation state in W 0.5 Co 0.4 Fe 0.1 ,c aused by the addition of the right amount of Fe,o ptimizes the binding energy of surface oxygen intermediates and leads to improved kinetics,w hich is probably key for boosting the OER activity.…”

mentioning

confidence: 96%

Trimetallic Oxyhydroxide Coralloids for Efficient Oxygen Evolution Electrocatalysis

et al. 2017

View full text Add to dashboard Cite

Trimetallic oxyhydroxides are one of the most effective materials for oxygen evolution reaction (OER) catalysis, a key process for water splitting. Herein, we describe a facile wet-chemical method to directly grow a series of coralloid trimetallic oxyhydroxides on arbitrary substrates such as nickel foam (NF) and carbon nanotubes (CNTs). The amount of iron in these oxyhydroxide sponges on NF and CNTs was precisely controlled, revealing that the electrocatalytic activity of the WCoFe trimetallic oxyhydroxides depends on the Fe amount in a volcano-like fashion. The optimized W Co Fe /NF catalyst exhibited an overpotential of only 310 mV to deliver a large current density of 100 mA cm and a very low Tafel slope of 32 mV dec . It also showed superior stability with negligible activity decay after use in the OER for 21 days (>500 h). X-ray photoelectron spectroscopy revealed that the addition of Fe leads to an on average lower Co oxidation state, which contributes to the enhanced OER performance.

show abstract

Hierarchical CoNi‐Sulfide Nanosheet Arrays Derived from Layered Double Hydroxides toward Efficient Hydrazine Electrooxidation

Cited by 211 publications

References 45 publications

Confined Synthesis of 2D Nanostructured Materials toward Electrocatalysis

Confined Synthesis of 2D Nanostructured Materials toward Electrocatalysis

CuCo₂S₄ Nanosheets@N‐Doped Carbon Nanofibers by Sulfurization at Room Temperature as Bifunctional Electrocatalysts in Flexible Quasi‐Solid‐State Zn–Air Batteries

Trimetallic Oxyhydroxide Coralloids for Efficient Oxygen Evolution Electrocatalysis

Contact Info

Product

Resources

About

Hierarchical CoNi‐Sulfide Nanosheet Arrays Derived from Layered Double Hydroxides toward Efficient Hydrazine Electrooxidation

Cited by 211 publications

References 45 publications

Confined Synthesis of 2D Nanostructured Materials toward Electrocatalysis

Confined Synthesis of 2D Nanostructured Materials toward Electrocatalysis

CuCo2S4 Nanosheets@N‐Doped Carbon Nanofibers by Sulfurization at Room Temperature as Bifunctional Electrocatalysts in Flexible Quasi‐Solid‐State Zn–Air Batteries

Trimetallic Oxyhydroxide Coralloids for Efficient Oxygen Evolution Electrocatalysis

Contact Info

Product

Resources

About

CuCo₂S₄ Nanosheets@N‐Doped Carbon Nanofibers by Sulfurization at Room Temperature as Bifunctional Electrocatalysts in Flexible Quasi‐Solid‐State Zn–Air Batteries