Different Interlayer Anions Controlled Zinc Cobalt Layered Double Hydroxide Nanosheets for Ethanol Electrocatalytic Oxidation

Yang, Hui; Guo, Tingting; Kang, Qin; Liu, Qingyun

doi:10.1021/acs.jpcc.1c06449

Cited by 12 publications

(4 citation statements)

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“…To explore the surface impact of Pd/Co 1 Fe 3 − LDH/NF on EOR, the electrochemically active surface area (ECSA) was evaluated by C dl , and the calculation equation can be described as ECSA = C dl /C s (where C s is the specific capacitance of the sample). 43 The ECSA values of Pd/ Co 1 Fe 3 −LDH/NF, Pd/NF, Pd/C (20%), Pt/C (20%), and Co 1 Fe 3 −LDH/NF in a solution containing ethanol (1.0 M) and KOH (1.0 M) were calculated to be 38.71, 19.85, 2.23, 3.08, and 2.69 mA•cm −2 , respectively (Figure 6d). Pd/ Co 1 Fe 3 −LDH/NF has the highest ECSA value, indicating that the area of contact between the active sites of the catalyst and the electrolyte was the largest.…”

Section: Resultsmentioning

confidence: 99%

“…The values of C dl for Pd/Co 1 Fe 3 –LDH/NF, Pd/NF, Pd/C (20%), Pt/C (20%), Co 1 Fe 3 –LDH/NF, and NF in a solution containing ethanol (1.0 M) and KOH (1.0 M) were calculated to be 18.58, 9.53, 1.07, 1.17, 1.29, and 0.48 μF·cm –2 , respectively (Figure c), suggesting that Pd/Co 1 Fe 3 –LDH/NF has abundant catalytic active centers. To explore the surface impact of Pd/Co 1 Fe 3 –LDH/NF on EOR, the electrochemically active surface area (ECSA) was evaluated by C dl , and the calculation equation can be described as ECSA = C dl / C s (where C s is the specific capacitance of the sample) . The ECSA values of Pd/Co 1 Fe 3 –LDH/NF, Pd/NF, Pd/C (20%), Pt/C (20%), and Co 1 Fe 3 –LDH/NF in a solution containing ethanol (1.0 M) and KOH (1.0 M) were calculated to be 38.71, 19.85, 2.23, 3.08, and 2.69 mA·cm –2 , respectively (Figure d).…”

Section: Resultsmentioning

confidence: 99%

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CoFe-Layered Double Hydroxide Coupled with Pd Particles for Electrocatalytic Ethanol Oxidation

Song

Xie

et al. 2023

ACS Appl. Mater. Interfaces

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Electrocatalytic efficiency and stability have emerged as critical issues in the ethanol oxidation reaction (EOR) of direct ethanol fuel cells. In this paper, Pd/Co1Fe3–LDH/NF as an electrocatalyst for EOR was prepared by a two-step synthetic strategy. Metal–oxygen bonds formed between Pd nanoparticles and Co1Fe3–LDH/NF guaranteed structural stability and adequate surface-active site exposure. More importantly, the charge transfer of the formed Pd–O–Co(Fe) bridge could effectively modulate the electrical structure of hybrids, improving the facilitated absorption of OH– radicals and oxidation of COads. Benefiting from the interfacial interaction, exposed active sites, and structural stability, the observed specific activity for Pd/Co1Fe3–LDH/NF (17.46 mA cm–2) was 97 and 73 times higher than those of commercial Pd/C (20%) (0.18 mA cm–2) and Pt/C (20%) (0.24 mA cm–2), respectively. Besides, the j f/j r ratio representing the resistance to catalyst poisoning was 1.92 in the Pd/Co1Fe3–LDH/NF catalytic system. These results provide insights into optimizing the electronic interaction between metals and the support of electrocatalysts for EOR.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

CoFe-Layered Double Hydroxide Coupled with Pd Particles for Electrocatalytic Ethanol Oxidation

Song

Xie

et al. 2023

ACS Appl. Mater. Interfaces

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“…LDHs are a kind of particularly promising 2D material and have received considerable attention for their electrocatalytic performance [ 16 , 17 , 18 ]. In particular, LDHs based on transition-metals (Fe, Co, Ni, and Mn) have attracted significant attention due to their superior EOR performance in alkaline media [ 19 , 20 , 21 , 22 , 23 ]. Nevertheless, plenty of the reported LDH-based electrocatalysts are still confronted with shortcomings, such as low surface area, poor conductivity, slow mass transport and electron transfer, etc.…”

Section: Introductionmentioning

confidence: 99%

ZIF-67-Derived NiCo-Layered Double Hydroxide@Carbon Nanotube Architectures with Hollow Nanocage Structures as Enhanced Electrocatalysts for Ethanol Oxidation Reaction

et al. 2023

Molecules

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The rational design of efficient Earth-abundant electrocatalysts for the ethanol oxidation reaction (EOR) is the key to developing direct ethanol fuel cells (DEFCs). Among these, the smart structure is highly demanded for highly efficient and stable non-precious electrocatalysts based on transition metals (such as Ni, Co, and Fe). In this work, high-performance NiCo-layered double hydroxide@carbon nanotube (NiCo-LDH@CNT) architectures with hollow nanocage structures as electrocatalysts for EOR were prepared via sacrificial ZIF-67 templates on CNTs. Comprehensive structural characterizations revealed that the as-synthesized NiCo-LDH@CNTs architecture displayed 3D hollow nanocages of NiCo-LDH and abundant interfacial structure between NiCo-LDH and CNTs, which could not only completely expose active sites by increasing the surface area but also facilitate the electron transfer during the electrocatalytic process, thus, improving EOR activity. Benefiting from the 3D hollow nanocages and interfacial structure fabricated by the sacrificial ZIF-67-templated method, the NiCo-LDH@CNTs-2.5% architecture exhibited enhanced electrocatalytic activity for ethanol oxidation compared to single-component NiCo-LDH, where the peak current density was 11.5 mA·cm-2, and the jf/jb value representing the resistance to catalyst poisoning was 1.72 in an alkaline environment. These results provide a new perspective on the fabrication of non-precious metal electrocatalysts for EOR in DEFCs.

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“…24 ZnCo-LDHs with different interlayer spacing controlled by different interlayer anions (NO 3 − , Cl − , and CH 3 COO − ) were used as effective non-noble metal electrocatalysts for the ethanol oxidation reaction (EOR) in alkaline pH condition. 25 Instead of electro-oxidation, nano hydrocalcites (LDHs) of Cu/Al, Co/Al, and Cu/Co/Al were tested in the electrolytic reduction of nitrate, where the optimized Cu 2 CoAl-LDH was found to be highly active in nitrate reduction. 26 In the electrocatalytic process, LDHs based on the transition metal ion, mainly cobalt and nickel ions, were utilized as heterogeneous electrocatalysts for oxidation in a liquid medium.…”

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confidence: 99%

Layered Double Hydroxide-Modified Electrodes for Gaseous Acetaldehyde Degradation at the Solid-Gas Interphase

Muthuraman

Yeom

Choi

et al. 2022

J. Electrochem. Soc.

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Electrochemical application has been considered a promising technology in environmental remediation. However, the development of hydrocarbon ligand-free mediators for long-term operation still deserves further assessments. In this study, three different combinations (NiAl, CoAl, NiCo) of layered double hydroxide (LDH) electrodes were prepared using in-situ and ex-situ methods. These LDH electrodes were applied as solid electrocatalysts for gaseous acetaldehyde degradation using a membrane-divided flow-through electrolytic cell. In cyclic voltammetry analysis, the in-situ prepared LDH-electrodes had high peak currents in high-valent redox couples (Ni3+/2+Al3+, Co3+/2+Al3+, and Ni3+/2+Co3+/2+) compared to low-valent redox couples (Ni2+/1+Al3+, Co2+/1+Al3+, and Ni2+/1+Co2+/1+). Due to the higher active surface area, the overall redox peak current was higher in the in-situ prepared LDH electrode than the ex-situ LDH electrode. During electrocatalytic degradation of acetaldehyde, the LDH electrodes containing cobalt ions had a higher mediated catalysis activity than the LDH containing nickel ions (NiAl-LDH). The Co3+ ions placed in the layered hydroxide synergistically mediate the electrons to degrade acetaldehyde at the solid-gas interface sustainably.

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Different Interlayer Anions Controlled Zinc Cobalt Layered Double Hydroxide Nanosheets for Ethanol Electrocatalytic Oxidation

Cited by 12 publications

References 56 publications

CoFe-Layered Double Hydroxide Coupled with Pd Particles for Electrocatalytic Ethanol Oxidation

CoFe-Layered Double Hydroxide Coupled with Pd Particles for Electrocatalytic Ethanol Oxidation

ZIF-67-Derived NiCo-Layered Double Hydroxide@Carbon Nanotube Architectures with Hollow Nanocage Structures as Enhanced Electrocatalysts for Ethanol Oxidation Reaction

Layered Double Hydroxide-Modified Electrodes for Gaseous Acetaldehyde Degradation at the Solid-Gas Interphase

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