3D freestanding flower-like nickel-cobalt layered double hydroxides enriched with oxygen vacancies as efficient electrocatalysts for water oxidation

Liu, Yihao; Chen, Yingying; Ge, Riyue; Li, Wenxian; Zhang, Yuan; Feng, Lingyan; Che, Renchao

doi:10.1016/j.susmat.2020.e00170

Cited by 10 publications

(11 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ratio of nickel to cobalt in L-NiCo LDH/NF is not much different from that in NiCo LDH/NF (Table S1), which is close to 1:1 and consistent with the initial feed ratio of precursors. In the Ni 2p spectra (Figure c), the two major peaks located at a binding energy (BE) of 854.8 eV for Ni 2p 3/2 and at 872.3 eV for Ni 2p 1/2 were deconvoluted into four spin–orbit doublets, which were attributed to Ni(II) (BE = 854.6 and 872.2 eV) and Ni(III) (BE = 855.7 and 873.9 eV), ,,, together with two characteristic satellites (noted as “sat.”) located at 879.2 and 861.0 eV. Upon laser irradiation, the principal peak of Ni 2p 3/2 shifted toward positive BE values for 0.97 eV compared with that of NiCo LDH/NF, indicating that the local electron density around Ni in L-NiCo LDH/NF was lowered owing to the generation of a large number of oxygen vacancies, ,, and meanwhile, the relative atomic ratio of Ni 2+ to Ni 3+ was also altered.…”

Section: Resultsmentioning

confidence: 99%

Section: Sample Characterizationmentioning

confidence: 99%

“…The recent studies have demonstrated that increasing oxygen vacancies is also an effective means to regulate the electrochemical activity of LDH. 32,33 However, the existing methods are cumbersome, which are faced with the problem that the oxygen vacancies cannot be generated in situ on the electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…These results all reveal that vacancies could effectively enhance carrier mobility and reduce the energy barrier for oxygen intermediates interacting with active sites. The recent studies have demonstrated that increasing oxygen vacancies is also an effective means to regulate the electrochemical activity of LDH. , However, the existing methods are cumbersome, which are faced with the problem that the oxygen vacancies cannot be generated in situ on the electrodes.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Oxygen Vacancies Boosted by Laser Irradiation Enable NiCo Layered Double Hydroxide with a High Oxygen Reduction/Evolution Catalytic Activity in Zn–Air Batteries and Water Splitting

Shang

Wang

et al. 2022

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Layered double hydroxide (LDH) provides a unique platform to design low-cost multifunctional catalysts owing to the special lamellar structure and excellent performance. Herein, by using nickel-cobalt LDH grown on the conductive nickel foam (NF) skeleton (NiCo LDH/NF), a three-dimensional structure featured with multilayer petals is constructed. Benefiting from the simple and feasible fixed-point laser irradiation, NiCo LDH/NF shows boosted oxygen vacancies, resulting in efficient catalytic activities, with an oxygen evolution reaction overpotential of only 253.31 mV at 10 mA cm–2 and a half-wave potential of 0.79 V vs RHE for oxygen reduction reaction. Attractively, rechargeable Zn–air batteries (ZABs) using the laser-irradiated NiCo LDH/Ni foam (L-NiCo LDH/NF) as the catalytic electrode display a high peak power value of 126.29 mW cm–2, surpassing that of commercially grouped Pt/C-IrO2 (88.43 mW cm–2). Moreover, the as-obtained L-NiCo LDH/NF also delivers enhanced catalytic activity in hydrogen evolution. Accordingly, the developed ZABs can drive the overall water splitting reaction using L-NiCo LDH/NF as the electrodes. Meanwhile, the key role of oxygen vacancy in the catalyst was verified by using the calculation based on density functional theory. Therefore, the simple method of laser irradiation is confirmed as a feasible way to boost oxygen vacancies in materials with enabled multifunctional electrocatalysis.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Sample Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oxygen Vacancies Boosted by Laser Irradiation Enable NiCo Layered Double Hydroxide with a High Oxygen Reduction/Evolution Catalytic Activity in Zn–Air Batteries and Water Splitting

Shang

Wang

et al. 2022

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…In recent years, many studies on non-noble-metal electrocatalysts have been carried out focusing on different starting materials. Particularly, carbides, , transition-metal phosphides, − oxides, , sulfides, nitrides, and selenides have received great attention as promising electrocatalysts toward HER. Due to their high electrochemical activities, transition-metal phosphides especially are highly explored as electrocatalysts toward HER. − Transition-metal phosphides are composed of highly electronegative P and metal atoms.…”

Section: Introductionmentioning

confidence: 99%

W-Doped MoP Nanospheres as Electrocatalysts for pH-Universal Hydrogen Evolution Reaction

Fereja

Guo

et al. 2021

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Because of its eco-friendliness and cost fairness, hydrogen-based energy production is considered as one of the most promising mechanisms and sources for future sustainable demand. However, developing noble-metal-free electrocatalysts with high catalytic efficiency, low cost, and high durability in pH-universal media is becoming a bottleneck for practical applications. Herein, W-MoP nanospheres derived from W-decorated metal–organic frameworks (MOFs) were prepared via a facile synthesis route and phosphorization. The as-prepared materials exhibited improved catalytic activity toward hydrogen evolution reaction (HER) with low overpotentials of 63, 71, and 82 mV at a current density of 10 mA/cm2 in acidic, alkaline, and neutral electrolytes, respectively. Furthermore, the as-prepared catalyst showed superior stability and fast interfacial electron transfer kinetics. W decoration, followed by phosphorization, together with the large surface area and nanospherical structure of the as-prepared catalyst could account for the superior catalytic efficiency in the whole pH range.

show abstract

Synthesis and Electronic Modulation of Nanostructured Layered Double Hydroxides for Efficient Electrochemical Oxygen Evolution

Wang

Shao

et al. 2021

ChemSusChem

View full text Add to dashboard Cite

Water electrolysis is considered to be one of the most promising technologies to produce clean fuels. However, its extensive realization critically depends on the progress in cost‐effective and high‐powered oxygen evolution reaction (OER) electrocatalysts. As a member of the big family of two‐dimensional (2D) materials, nanostructured layered double hydroxides (nLDHs) have made significant processes and continuous breakthroughs for OER electrocatalysis. In this Review, the advancements in designing nLDHs for OER in recent years were discussed with a unique focus on their electronic modulations and in situ analysis on catalytic processes. After a brief discussion on different synthetic methodologies of nLDHs, including “bottom‐up” and “top‐down” approaches, the general strategies to enhance the catalytic performances of nLDHs reported so far were summarized, including compositional substitution, heteroatom doping, vacancy engineering, and amorphous/crystalline engineering. Furthermore, the in situ OER processes and mechanism analysis on engineering efficient nLDHs electrocatalysts were discussed. Finally, the research trends, perspectives, and challenges on designing nLDHs were also carefully outlined. This progress Review may offer enlightening experimental/theoretical guidance for designing highly catalytic active nLDHs and provide new directions to promote their future prosperity for practical utilization in water splitting.

show abstract

3D freestanding flower-like nickel-cobalt layered double hydroxides enriched with oxygen vacancies as efficient electrocatalysts for water oxidation

Cited by 10 publications

References 78 publications

Oxygen Vacancies Boosted by Laser Irradiation Enable NiCo Layered Double Hydroxide with a High Oxygen Reduction/Evolution Catalytic Activity in Zn–Air Batteries and Water Splitting

Oxygen Vacancies Boosted by Laser Irradiation Enable NiCo Layered Double Hydroxide with a High Oxygen Reduction/Evolution Catalytic Activity in Zn–Air Batteries and Water Splitting

W-Doped MoP Nanospheres as Electrocatalysts for pH-Universal Hydrogen Evolution Reaction

Synthesis and Electronic Modulation of Nanostructured Layered Double Hydroxides for Efficient Electrochemical Oxygen Evolution

Contact Info

Product

Resources

About