Prevention of the Reduction of CuO during X-ray Photoelectron Spectroscopy Analysis

Iijima, Yoshitoki; Niimura, Noriyasu; Hiraoka, Kenzo

doi:10.1002/(sici)1096-9918(199603)24:3<193::aid-sia94>3.0.co;2-c

Cited by 79 publications

(56 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These satellite peaks are characteristic of Cu 2+ materials with a d9 configuration in the ground state (absent in case of Cu 2 O) and are in good agreement with the values reported for Cu 2p levels in CuO phase. 22 The CuO x -NLs sample exhibits a lattice O 1s peak at binding energy of 531.8 eV that is attributed to a surface-bound hydroxide species originating from adsorbed H 2 O molecules on the surface of the CuO-based film ( Figure S4c). 20 EDX (energy dispersive X-ray) measurements for the bulk elemental composition show Cu and O with a 1:1 ratio in the CuO x -NLs film ( Figure S5).…”

mentioning

confidence: 99%

Controlled Surface-Assembly of Nanoscale Leaf-Type Cu-Oxide Electrocatalyst for High Activity Water Oxidation

Joya

Groot

2016

ACS Catal.

View full text Add to dashboard Cite

ABSTRACT:The controlled surface deposition of a robust and highperformance nanostructured copper-oxide (CuO x -NLs) electrocatalyst for water oxidation is presented. The material exhibits a characteristic leaf-type morphology and self-assembles on a copper substrate by straightforward constant-current anodization. The oxygen onset occurs at about 1.55 V versus RHE (η = 320 mV), which is 400−500 mV less than for amorphous Cu-oxide films. A Tafel slope of 44 mV dec −1 is obtained, which is the lowest observed relative to other copper-based materials. Long-term catalytic performance and stability tests of the electrocatalytic CuO x -NLs sample show a stable current density of >17 mA cm −2 for oxygen evolution, which was sustained for many hours.KEYWORDS: electrocatalyst, water oxidation, copper-oxide, nanoscale leaves, oxygen evolution T here are continuous efforts to develop a strategy to produce renewable and cleaner energy carriers from abundant solar radiation and water.1,2 In this quest, catalytic water oxidation is regarded as a primary process, and many inorganic materials and transition metal-oxides are considered good candidates for this conversion.2,3 Metal-oxide catalysts can be electrodeposited on conducting substrates from carbonate, phosphate, or borate electrolytes in the presence of metal ions. 4−6 To eliminate the possibility for interaction of metal ions with the cathodic sites during electrolysis, membranes or separators are usually employed that make the system more complex and introduce resistance and diffusion limitations in the electrochemical process.7 New preparation methods are required that are easily implemented, and catalytic materials are desired to perform in metal ion free systems for sustained electrochemical operation. 8,9 In addition, control over the catalyst morphology and surface structure is important to induce a high surface area and phase purity, facilitating both charge transfer and mass transport during catalysis reaction. 9,10Stable and efficient metal-oxide derived electrocatalysts can develop in a carbonate/bicarbonate system under mild conditions. 5,11 HCO 3 − /CO 3 2− is suggested to facilitate proton management and prevent the degradation of these catalytic materials under anodic conditions. 12−14 We observed that anodization of a copper electrode via repetitive potentialsweeps or at constant-potential in a carbonate buffer induces the formation of very small copper-oxide particulate materials (CuO x -NPs) having oxygen onset at ∼1.59 V versus RHE (η ≥ 360 mV). In addition, we found that nanoscale leaf-shaped Cuoxide (CuO x -NLs) surface structures ( Figure S1) are formed during controlled anodization of a chemically etched copper substrate at a constant current density of 4.0 mA cm −2 in a carbonate system. The CuO x -NLs exhibit a remarkably low overpotential for water oxidation (η = 320 mV) relative to other Cu-based electrocatalysts 13−15 and many inorganic materials. 16,17 Scanning electron microscopy (SEM) imaging shows a leaves-type copper-oxide matrix (Figur...

show abstract

mentioning

confidence: 99%

Controlled Surface-Assembly of Nanoscale Leaf-Type Cu-Oxide Electrocatalyst for High Activity Water Oxidation

Joya

Groot

2016

ACS Catal.

View full text Add to dashboard Cite

show abstract

“…7c (the region of this larger peak contains contributions from both Cu(I) and Cu(II)). However it was unclear if such a small change was also affected by radiation damage from the XPS sampling, as has been reported for similar compounds [50]. To further investigate the mechanism of fluorescence quenching, magnetic moment measurements (hysteresis loops with varying magnetic field) were carried out on QD-bipyCu(OH) 2 .…”

Section: Optical Properties and Photoluminescence Quenchingmentioning

confidence: 97%

Ligand-functionalised copper(II) hydroxide for quantum dot photoluminescence quenching

Eerd¹,

Young²,

Al-Salim³

et al. 2010

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…Thus, Ag and Cu atoms exist as metallic elementary substances, and the presence of CuO and Cu 2 O caused by environmental atmosphere is ultrathin and restricted on the surface of AgCu-10 catalyst. The absence of CuO phase in XRD spectrum may due to little CuO partially reduced to Cu 2 O during the XRD test [24] . The occurrence of CuO and Cu 2 O could be reduced into metallic copper during ORR process.…”

Section: (B) the Ni Foam Andmentioning

confidence: 99%

Facile preparation of Ag-Cu bifunctional electrocatalysts for zinc-air batteries

Jin

Chen

2015

Electrochimica Acta

View full text Add to dashboard Cite

Prevention of the Reduction of CuO during X-ray Photoelectron Spectroscopy Analysis

Cited by 79 publications

References 26 publications

Controlled Surface-Assembly of Nanoscale Leaf-Type Cu-Oxide Electrocatalyst for High Activity Water Oxidation

Controlled Surface-Assembly of Nanoscale Leaf-Type Cu-Oxide Electrocatalyst for High Activity Water Oxidation

Ligand-functionalised copper(II) hydroxide for quantum dot photoluminescence quenching

Facile preparation of Ag-Cu bifunctional electrocatalysts for zinc-air batteries

Contact Info

Product

Resources

About