Intercalation of Cobalt into the Interlayer of Birnessite Improves Oxygen Evolution Catalysis

Thenuwara, Akila C.; Shumlas, Samantha L.; Attanayake, Nuwan H.; Aulin, Yaroslav V.; McKendry, Ian G.; Qiao, Qiao; Zhu, Yimei; Borguet, Eric; Zdilla, Michael J.; Strongin, Daniel R.

doi:10.1021/acscatal.6b01980

Cited by 79 publications

(86 citation statements)

References 31 publications

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“…031-0.061 s À1 )m aterials revealed highera ctivity for OER than birnessite (TOF = 0.0004 s À1 )u nder the same experimental conditions. [128][129][130] Based on the structural similarity of the compounds,i tw as suggestedt hat water oxidation mainly occurs in the interlayer region of the birnessite composites.…”

Section: Heterogeneous Catalysts For Oermentioning

confidence: 99%

From Enzymes to Functional Materials—Towards Activation of Small Molecules

Möller

Piontek

Miller

et al. 2017

Chemistry A European J

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The design of non-noble metal-containing heterogeneous catalysts for the activation of small molecules is of utmost importance for our society. While nature possesses very sophisticated machineries to perform such conversions, rationally designed catalytic materials are rare. Herein, we aim to raise the awareness of the overall common design and working principles of catalysts incorporating aspects of biology, chemistry, and material sciences.

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Section: Heterogeneous Catalysts For Oermentioning

confidence: 99%

From Enzymes to Functional Materials—Towards Activation of Small Molecules

Möller

Piontek

Miller

et al. 2017

Chemistry A European J

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“…The electrochemical performance of MnO 2 is not active ( Figure S7), and birnessite is reported as one of the least active materials, exhibiting an overpotential of 750 mV (at 10 mA cm À 2 ). [14][15] The OER onset potential of IrO 2 / MnÀ Co(2 : 1)-Bir is merely 1.427 V, which is 29 mV lower than IrO 2 . The LSV curves of the prepared electrodes are displayed in Figure 3a.…”

Section: Resultsmentioning

confidence: 97%

“…As reported previously, Co, either as interlayer cations or a dopant for in-layer sheets of MnO 2 birnessite, can enhance the electrochemical performance because the involvement of Co can increase the conductivity, introduce defect active sites, and tune the binding strength of oxygen intermediates. [14] Nevertheless, the successful integration of MnO 2 or MnÀ Co birnessite as an electrocatalyst support material is rarely reported.…”

Section: Resultsmentioning

confidence: 99%

Effective Strain Engineering of IrO₂ Toward Improved Oxygen Evolution Catalysis through a Catalyst‐Support System

et al. 2019

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A template‐free, one‐step synthesis of nano‐IrO2 on a layered Mn−Co birnessite support was developed to induce the catalyst‐support interaction. The IrO2 nanoparticles were prepared with inherent crystal lattice strain, which is derived from the Ir‐O−Mn mismatch at the interface. The oxidation state of iridium is higher than IrIV, revealing the electron transfer to the substrate. On account of the crystal lattice distortion and electronic manipulations being favorable to the oxygen evolution reaction (OER), the as‐synthesized composite exhibited excellent OER activity and stability. The improved catalytic nature was followed by enhancement in the electrochemical active surface area, mass specific activity, and intrinsic activity. Moreover, the Tafel slope of 42 mV dec−1 reveals better reaction kinetics for IrO2/Mn−Co (2 : 1)‐birnessite than many previously reported catalysts despite the low precious noble metal content in the as‐synthesized composite. Conclusively, we have proven that the strain engineering holds vital importance in forming catalyst‐support interaction and rational design of catalysts.

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“…Interestingly the peak at 12.1° shifted to a lower angle for Bi 3+ ‐modified MnO 2 as compared to its unmodified counterpart, which corresponds to a slight increase of interlayer distance from ∼0.72 nm for MnO 2 to ∼0.77 nm for Bi 3+ ‐modified MnO 2 . The shift in the angle may be attributed to the widening of the interlayer spacing due to the incorporation of Bi 3+ …”

Section: Resultsmentioning

confidence: 99%

Interlayer Engineering of MnO₂ with High Charge Density Bi³⁺ for High Rate and Stable Aqueous Supercapacitor

Xiong

Zhu

Zhang

et al. 2020

Batteries & Supercaps

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Two‐dimensional δ‐MnO2 has attracted considerable attention as supercapacitor electrode due to its ability to incorporate foreign ions into its interlayer spacing which suggests the possibility of capacitance enhancement through interlayer engineering. Incorporating high charge density cation such as Bi3+ into the MnO2 interlayer becomes an attractive strategy that not only serves to stabilize the layer structure, it is also an important prelude towards the weakening of the chemical bonding between the O from MnO2 and the intercalating electrolyte species. This in turn leads to higher reversibility while ensuring excellent structural stability that is portrayed in enhanced cyclic stability and rate performance. Herein, the Bi3+‐modified δ‐MnO2 delivered a reversible specific capacity of 421 F g−1 at 1 A g−1, which is higher than that of the previously reported mono/divalent cation‐intercalant modified MnO2 systems. Using the N‐doped carbon nanosheets as the negative electrode, the assembled asymmetric supercapacitor achieved a high capacitance of 77 F g−1 at 1 Ag−1. Furthermore, the high energy density of 20 Wh kg−1 was recorded at a high‐power density of 39 kW kg−1, while simultaneously demonstrating excellent cycle performance of 82 % capacitance retention after 40 000 cycles. This work has shown that interlayer engineering of layered MnO2 could potentially provide new insight into the development of high‐performance supercapacitor electrode.

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Intercalation of Cobalt into the Interlayer of Birnessite Improves Oxygen Evolution Catalysis

Cited by 79 publications

References 31 publications

From Enzymes to Functional Materials—Towards Activation of Small Molecules

From Enzymes to Functional Materials—Towards Activation of Small Molecules

Effective Strain Engineering of IrO₂ Toward Improved Oxygen Evolution Catalysis through a Catalyst‐Support System

Interlayer Engineering of MnO₂ with High Charge Density Bi³⁺ for High Rate and Stable Aqueous Supercapacitor

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Intercalation of Cobalt into the Interlayer of Birnessite Improves Oxygen Evolution Catalysis

Cited by 79 publications

References 31 publications

From Enzymes to Functional Materials—Towards Activation of Small Molecules

From Enzymes to Functional Materials—Towards Activation of Small Molecules

Effective Strain Engineering of IrO2 Toward Improved Oxygen Evolution Catalysis through a Catalyst‐Support System

Interlayer Engineering of MnO2 with High Charge Density Bi3+ for High Rate and Stable Aqueous Supercapacitor

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Product

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Effective Strain Engineering of IrO₂ Toward Improved Oxygen Evolution Catalysis through a Catalyst‐Support System

Interlayer Engineering of MnO₂ with High Charge Density Bi³⁺ for High Rate and Stable Aqueous Supercapacitor