An XPS and AES study of the ageing of a Co–20%Ni metal‐evaporated tape

Mitton, D. B.; Walton, John; Thompson, G.E.

doi:10.1002/sia.740200107

Cited by 27 publications

(18 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Co 2p 3/2 peaks at around 780.0 eV for high chemical valence CoOOH appear and become the strongest peak for both Co−B and Co2−Fe−B samples after the activation process (Figure 6b). 42 Previous reports based on DFT calculations indicate that the formation of OOH-like species is the most difficult step in thermodynamics; hence, the OOH species are the key intermediates in the OER process. 23 The O 1s peak at around 532.4 and 531.1 eV can be ascribed to the oxygen in hydroxide and absorbed oxygen, respectively.…”

Section: ■ Results and Discussionsupporting

confidence: 75%

Synergistic Activity of Co and Fe in Amorphous Cox–Fe–B Catalyst for Efficient Oxygen Evolution Reaction

Chen

Ouyang

Zhao

et al. 2017

ACS Appl. Mater. Interfaces

158

View full text Add to dashboard Cite

Water splitting has been greatly limited by the sluggish kinetics of the oxygen evolution reaction (OER). High-oxidation-state metal species are required as the favorable active sites in OER. Here, amorphous Cox-Fe-B (x is the molar ratio of Co/Fe), Co-B, and Fe-B compounds were successfully synthesized as the oxygen evolution electrocatalysts. The calculation of turnover frequency (TOF) indicates that both the Co and Fe sites are active for OER. Cyclic voltammetry, X-ray photoelectron spectroscopy, and long-term stability curves were used to demonstrate that Fe can stabilize Co in a higher oxidation level and meanwhile promote the generation of OOH-like species (the key intermediates for OER). The reduced impedance for Co2-Fe-B (compared with that for Fe-B and Co-B) obtained from the electrochemical impedance spectra confirms the enhanced conductivity for the Co2-Fe-B. This optimal sample on Cu substrate shows a low overpotential of 0.298 V at the current density of 10 mA cm with a decreased overpotential of 42 mV compared to that of Co-B. The Co2-Fe-B catalyst also exhibits a small Tafel slope of 62.6 mV/dec and good stability. The enhanced performance could be attributed to the synergistic effect of the increased population of high-oxidation-state metal-OOH species and the promoted conductivity of the catalyst. A solar-to-hydrogen energy conversion efficiency of 4.2% and a Faradaic efficiency of 97.2% can be achieved by connecting the HER and as-prepared OER electrodes to a crystalline silicon solar cell.

show abstract

Section: ■ Results and Discussionsupporting

confidence: 75%

Synergistic Activity of Co and Fe in Amorphous Cox–Fe–B Catalyst for Efficient Oxygen Evolution Reaction

Chen

Ouyang

Zhao

et al. 2017

ACS Appl. Mater. Interfaces

158

View full text Add to dashboard Cite

show abstract

“…Generally, the XPS analysis of Co 2p is not trivial due to its multiplet spitting, plasmon loss features associated with Co metal 55,56 and shake-up loss features associated with Co oxides. 57 As shown in Fig. 5, the peak broadening is mainly based on the high pass energy of 100 eV (Table S2 Aer synthesis, the XPS data show atomic Pt : Co ratios of 75 : 25, 52 : 48, and 37 : 63 for pristine Pt 3 Co, PtCo, and PtCo 3 , respectively, which is in good agreement with the elemental results obtained from EDX (see Table 3).…”

Section: Structural Characterization Of Pristine Pt X Co 1àx Alloy Nanoparticle Electrocatalystssupporting

confidence: 84%

Tuning of Pt–Co nanoparticle motifs for enhancing the HOR performance in alkaline media

2021

View full text Add to dashboard Cite

show abstract

“…The chemical compositions of the as-prepared NiFe films were analyzed by X-ray photoelectron spectroscopy (XPS), as shown in Figure . All films exhibited two main peaks of Ni 2p 3/2 at the binding energies of 852.5 and 855.2 eV, and two peaks of Ni 2p 1/2 centered at 869.9 and 873.3 eV, which were attributed to Ni and NiO/Ni(OH) 2 phases, respectively. ,, Their Fe 2p 3/2 peaks at 706.9 and 711.3 eV were due to the Fe and Fe 3+ states, respectively. , These results suggest that the metal film surface is the NiFe oxide/Ni(Fe)(OH) 2 phase, whereas the metal underneath remains in the metallic state. The oxides on the metal film surface might be formed by the surface oxidation after the evaporation deposition.…”

Section: Resultsmentioning

confidence: 78%

“…All films exhibited two main peaks of Ni 2p 3/2 at the binding energies of 852.5 and 855.2 eV, and two peaks of Ni 2p 1/2 centered at 869.9 and 873.3 eV, which were attributed to Ni and NiO/Ni(OH) 2 phases, respectively. 26,30,31 Their Fe 2p 3/2 peaks at 706.9 and 711.3 eV were due to the Fe and Fe 3+ states, respectively. 32,33 These results suggest that the metal film surface is the NiFe oxide/Ni(Fe)(OH) 2 phase, whereas the metal underneath remains in the metallic state.…”

Section: ■ Results and Discussionmentioning

confidence: 90%

Highly Efficient NiFe Nanoparticle Decorated Si Photoanode for Photoelectrochemical Water Oxidation

Huang

Zhong

et al. 2018

Chem. Mater.

View full text Add to dashboard Cite

n-Si is a narrow band gap semiconductor that has been demonstrated as an excellent photoabsorber material for photoelectrochemical (PEC) water splitting. Depositing a thin layer of Ni film on n-Si can form a Schottky junction at the interface, which offers a simple and useful route toward light-driven water oxidation. However, the relatively low catalytic activity of the Ni layer and the presence of interface states limit the application of this structure. Herein, we prepared a high-performance NiFe nanoparticle decorated Si photoanode for efficient solar-driven water oxidation to O2. NiFe nanoparticles were dispersed on a Si substrate surface homogeneously to form an inhomogeneous metal–insulator–semiconductor (MIS) junction, which increased the photovoltage of the photoanode. In addition, the oxide/oxyhydroxide layer on the deposited NiFe layer formed during the evaporation deposition acted as a highly efficient electrocatalyst, which also contributed to the high PEC performance of the photoanode. The photoanode covered with a 2 nm NiFe film exhibited the best PEC performance with a low onset potential of 1.09 V versus reversible hydrogen electrode (RHE) (the potential required to reach the photocurrent of 1 mA/cm2), a high photocurrent of 25.2 mA/cm2 at 1.23 V versus RHE, and a stable output over 50 h under AM 1.5G illumination due to the high-performance inhomogeneous MIS junction and a thick oxide/oxyhydroxide catalytic shell formed on the NiFe nanoparticle via an aging process.

show abstract

An XPS and AES study of the ageing of a Co–20%Ni metal‐evaporated tape

Cited by 27 publications

References 22 publications

Synergistic Activity of Co and Fe in Amorphous Cox–Fe–B Catalyst for Efficient Oxygen Evolution Reaction

Synergistic Activity of Co and Fe in Amorphous Cox–Fe–B Catalyst for Efficient Oxygen Evolution Reaction

Tuning of Pt–Co nanoparticle motifs for enhancing the HOR performance in alkaline media

Highly Efficient NiFe Nanoparticle Decorated Si Photoanode for Photoelectrochemical Water Oxidation

Contact Info

Product

Resources

About