Stable doped sp2 C-hybrid nanostructures by reactive ion beam irradiation

Murugaraj, P.; Mainwaring, David E.; Kobaisi, Mohammad Al; Siegele, Rainer

doi:10.1039/c2jm32714g

Cited by 10 publications

(14 citation statements)

References 51 publications

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“…This result indicates that there are abundant O vacancies in the CoO x NPs/BNG hybrid after NH 3 treatment. Additionally, the high‐resolution B 1s spectrum (Figure c) shows a peak at 192.0 eV that corresponds to C−B−N bonds, indicating replacement of C atoms by B atoms in the vicinity of N atoms . In the N regions, except for the existence of features associated with pyridinic‐N and pyrrolic‐N, a characteristic peak with a 397.6 eV binding energy is observed that is attributed to metal−nitrogen bonds (Figure d) .…”

Section: Figurementioning

confidence: 92%

A Bifunctional Hybrid Electrocatalyst for Oxygen Reduction and Evolution: Cobalt Oxide Nanoparticles Strongly Coupled to B,N‐Decorated Graphene

et al. 2017

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The electrocatalyzed oxygen reduction and evolution reactions (ORR and OER, respectively) are the core components of many energy conversion systems, including water splitting, fuel cells, and metal–air batteries. Rational design of highly efficient non‐noble materials as bifunctional ORR/OER electrocatalysts is of great importance for large‐scale practical applications. A new strongly coupled hybrid material is presented, which comprises CoOx nanoparticles rich in oxygen vacancies grown on B,N‐decorated graphene (CoOx NPs/BNG) and operates as an efficient bifunctional OER/ORR electrocatalyst. Advanced spectroscopic techniques were used to confirm formation of abundant oxygen vacancies and strong Co−N−C bridging bonds within the CoOx NPs/BNG hybrid. Surprisingly, the CoOx NPs/BNG hybrid electrocatalyst is highly efficient for the OER with a low overpotential and Tafel slope, and is active in the ORR with a positive half‐wave potential and high limiting current density in alkaline medium.

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Section: Figurementioning

confidence: 92%

A Bifunctional Hybrid Electrocatalyst for Oxygen Reduction and Evolution: Cobalt Oxide Nanoparticles Strongly Coupled to B,N‐Decorated Graphene

et al. 2017

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“…Additionally,t he high-resolution B1ss pectrum (Figure 2c)s hows ap eak at 192.0 eV that corresponds to C À B À Nb onds, indicating replacement of Catoms by Batoms in the vicinity of Na toms. [17] In the Nr egions,e xcept for the existence of features associated with pyridinic-N and pyrrolic-N,acharacteristic peak with a397.6 eV binding energy is observed that is attributed to metal À nitrogen bonds (Figure 2d). [18] This result suggests that there are many Co À Nb onds in the CoO x NPs/ BNG hybrid.…”

Section: Methodsmentioning

confidence: 99%

A Bifunctional Hybrid Electrocatalyst for Oxygen Reduction and Evolution: Cobalt Oxide Nanoparticles Strongly Coupled to B,N‐Decorated Graphene

et al. 2017

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The electrocatalyzed oxygen reduction and evolution reactions (ORR and OER, respectively) are the core components of many energy conversion systems, including water splitting, fuel cells, and metal-air batteries. Rational design of highly efficient non-noble materials as bifunctional ORR/OER electrocatalysts is of great importance for large-scale practical applications. A new strongly coupled hybrid material is presented, which comprises CoO nanoparticles rich in oxygen vacancies grown on B,N-decorated graphene (CoO NPs/BNG) and operates as an efficient bifunctional OER/ORR electrocatalyst. Advanced spectroscopic techniques were used to confirm formation of abundant oxygen vacancies and strong Co-N-C bridging bonds within the CoO NPs/BNG hybrid. Surprisingly, the CoO NPs/BNG hybrid electrocatalyst is highly efficient for the OER with a low overpotential and Tafel slope, and is active in the ORR with a positive half-wave potential and high limiting current density in alkaline medium.

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“…The Fe 2p spectrum (Figure c) exhibited a doublet of 2p 3/2 (712.2 eV) and 2p 1/2 (726.7 eV) states that were separated by 14.5 eV, which manifested the formation of Fe(OH) 3 . , The binding energy of Fe 2p 3/2 and 2p 1/2 of NiZnFeB-LDH positively shifted 0.37 and 0.42 eV as compared with NiFeB-OH, indicating that the doping of the Zn modulated the chemical environment of the iron ions . Besides that, the high-resolution B 1s spectrum displayed that the well-defined peak at 191.9 eV corresponded to a B–O band (Figure d), showing a negative shift of 0.25 eV in comparison with NiZnB-LDH and NiFeB-OH. , These results demonstrated that the electrons transferred from Fe, Zn, and Ni to B through oxygen bonds . The shifted peaks of prepared electrodes revealed the strong interactions among Ni, Zn, Fe, and B, which effectively improved the OER activity.…”

Section: Results and Discussionmentioning

confidence: 96%

“…38 Besides that, the high-resolution B 1s spectrum displayed that the well-defined peak at 191.9 eV corresponded to a B−O band (Figure 3d), showing a negative shift of 0.25 eV in comparison with NiZnB-LDH and NiFeB-OH. 39,40 These results demonstrated that the electrons transferred from Fe, Zn, and Ni to B through oxygen bonds. 21 The shifted peaks of prepared electrodes revealed the strong interactions among Ni, Zn, Fe, and B, which effectively improved the OER activity.…”

Section: ■ Experimental Sectionmentioning

confidence: 82%

Fe and B Codoped Nickel Zinc Layered Double Hydroxide for Boosting the Oxygen Evolution Reaction

Sun

2020

ACS Sustainable Chem. Eng.

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With global environmental degradation and an energy shortage, it is desirable to fabricate inexpensive as well as resistant oxidation catalysts toward the oxygen evolution reaction (OER). Herein, we prepared Fe and B codoped NiZn layered double hydroxides (LDHs) nanosheets via in situ growth on nickel foam by an ion etching strategy. Moreover, the representative NiZnFeB-LDH nanosheets presented a superior electrocatalytic performance for OER with a low 280 mV overpotential at 100 mA cm–2 and Tafel slope of 48.4 mV dec–1, outperforming most Ni-based materials reported up until now. In addition, the NiZnFeB-LDH can maintain stable electrocatalytic activity for as long as 120 h (100 mA cm–2). The codoping of Fe and B modulated the intrinsic electronic properties of NiZn-LDH, and even the synergetic effects among these metal centers with the nonmetallic element accelerated the transfer ability of charges, thus achieving excellent performance. This work can supply a new perspective for designing remarkable electrocatalysts.

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Stable doped sp2 C-hybrid nanostructures by reactive ion beam irradiation

Cited by 10 publications

References 51 publications

A Bifunctional Hybrid Electrocatalyst for Oxygen Reduction and Evolution: Cobalt Oxide Nanoparticles Strongly Coupled to B,N‐Decorated Graphene

A Bifunctional Hybrid Electrocatalyst for Oxygen Reduction and Evolution: Cobalt Oxide Nanoparticles Strongly Coupled to B,N‐Decorated Graphene

A Bifunctional Hybrid Electrocatalyst for Oxygen Reduction and Evolution: Cobalt Oxide Nanoparticles Strongly Coupled to B,N‐Decorated Graphene

Fe and B Codoped Nickel Zinc Layered Double Hydroxide for Boosting the Oxygen Evolution Reaction

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