Highly efficient oxygen evolution catalysis achieved by NiFe oxyhydroxide clusters anchored on carbon black

Wang, Zhongke; Wang, Yuyang; Zhang, Nan; Ma, Lixia; Sun, Jie; Yu, Can; Liu, Shoujie; Jiang, Ruibin

doi:10.1039/d2ta01931k

Cited by 19 publications

(19 citation statements)

References 58 publications

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“…The charge-transfer resistance ( R ct ) for ANCO-1, ANCO-2, and ANCO-3 is 52.3, 40.2, and 78.3 Ω, respectively. The lowest R ct for ANCO-2 reveals that ANCO-2 has the lowest interfacial charge transfer and kinetic resistance …”

Section: Resultsmentioning

confidence: 99%

“…The lowest R ct for ANCO-2 reveals that ANCO-2 has the lowest interfacial charge transfer and kinetic resistance. 62 The ECSA normalized current can better reflect the intrinsic catalytic activity of the catalysts compared with the geometric area normalized current. 47 As shown in Figure S11, the highest ECSA normalized current density of ANCO-3 indicates that Co doping can improve the samples' intrinsic electrocatalytic activity, which is consistent with the XPS analysis.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

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Highly Efficient Methanol Oxidation Reaction Achieved by Cobalt Doping in Delafossite AgNi_1–xCo_xO₂ Solid Solution

Zhang

Kong

Xing

et al. 2022

ACS Appl. Energy Mater.

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Developing highly active and durable non-platinum catalysts for methanol oxidation is of great significance for direct methanol fuel cells. However, their electrocatalytic efficiency is still insufficient mainly due to their poor electrical conductivity and slow reaction kinetics. Herein, a non-Pt electrocatalyst AgNi 0.8 Co 0.2 O 2 with a delafossite structure is facilely constructed via a cation-exchange strategy for the methanol oxidation reaction in alkaline media. The introduction of Co atoms is favorable to crystallization for boosting the synthesis procedure. Meanwhile, the uniform distribution of Co and Ni in the structure brings about additional oxygen vacancies in the materials, thereby improving the intrinsic methanol oxidation reaction activity of the catalysts, and the introduced Co atoms can help to oxidize intermediates such as formaldehyde. Therefore, the electrocatalyst exhibits excellent electrocatalytic performance (77.6 mA cm −2 , 220 mA mg −1 ) and high selectivity, and it can effectively inhibit the oxygen evolution reaction (310 mV difference from the oxygen evolution reaction potential at 10 mA cm −2 ). This work not only provides a material system using cheap and effective non-Pt catalysts based on Ag-based delafossite oxides but also sheds light on the engineering of oxygen vacancies of electrocatalysts for developing highperformance direct methanol fuel cells.

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Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Measurementsmentioning

confidence: 99%

Highly Efficient Methanol Oxidation Reaction Achieved by Cobalt Doping in Delafossite AgNi_1–xCo_xO₂ Solid Solution

Zhang

Kong

Xing

et al. 2022

ACS Appl. Energy Mater.

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“…Over the past decade, great efforts have been put into the study of single-atom catalysts, which possess an atomic dispersion of 100% to achieve full utilization of active metal atoms, which is remarkably effective to reduce the consumption of precious metals. − Nevertheless, most supports beyond metal oxides are chemically unstable in the oxidizing atmosphere, such as carbon, metal sulfides, and so on. Consequently, metal oxide-supported single-atom (single-atom/metal oxide) catalysts are essential to catalytic CO oxidation.…”

Section: Introductionmentioning

confidence: 99%

Boosting the Activity of Single-Atom Pt₁/CeO₂ via Co Doping for Low-Temperature Catalytic Oxidation of CO

et al. 2022

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The properties of supports have a significant effect on the activity of noble metal single atoms. In this work, Co-doped CeO 2 -supported single-atom Pt catalysts (Pt 1 /Co-CeO 2 ) have been acquired by a synchronous pyrolysis/ deposition route and demonstrated to promote low-temperature oxidation of CO. Revealed by a model reaction of 1% CO + 1% O 2 + 98% He at a space velocity of 12,000 mL/g cat /h, CO conversion (100 °C) acquired on a (0.5% Pt)/ (10% Co-CeO 2 ) catalyst (36.6%) was 3.6 and 4.9 times those of 0.5% Pt/CeO 2 (10.0%) and 10% Co-CeO 2 (7.4%) catalysts and 2.1 times that of their conversion sum (17.4%), confirming the positive role of the Co dopant in boosting the low-temperature oxidation of CO. The consistent results are also verified in the comparison of Pt 1 /Co-ZnO with Pt 1 /ZnO and Pt 1 /Co-Al 2 O 3 with Pt 1 /Al 2 O 3 . In addition, the activity of single-atom Pt 1 /Co-CeO 2 catalysts can be facilely modified by changing the loading of Pt and/or doping amount of Co. These reasonable data will provide a methodology to access more applicable catalysts for CO oxidation at low temperature.

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“… where Δ j is the current density (mA cm –2 ), V is the potential, and C s is the standard specific capacitance ( C s −0.04 mF cm –2 ). 25 Pd(II)IPA/GrCC, Co(II)IPA/GrCC, and Ni(II)IPA/GrCC hybrid complexes involve ECSA values of 0.15, 0.385, and 0.152 m 2 g –1 , respectively. The high surface area of the electrocatalysts is due to the presence of the porous and weaved textile framework of the carbon cloth.…”

Section: Resultsmentioning

confidence: 99%

“…The linear plot (Figure a) revealed that the electrocatalytic process is a diffusion-controlled process. The current is due to the facile electron flow at the electrode/electrolyte interface. where Δ j is the current density (mA cm –2 ), V is the potential, and C s is the standard specific capacitance ( C s −0.04 mF cm –2 ) . Pd(II)IPA/GrCC, Co(II)IPA/GrCC, and Ni(II)IPA/GrCC hybrid complexes involve ECSA values of 0.15, 0.385, and 0.152 m 2 g –1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Graphitic Carbon Cloth-Based Hybrid Molecular Catalyst: A Non-conventional, Synthetic Strategy of the Drop Casting Method for a Stable and Bifunctional Electrocatalyst for Enhanced Hydrogen and Oxygen Evolution Reactions

Murthy

Neelakantan

2022

ACS Omega

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Hydrogen energy production through water electrolysis is envisaged as one of the most promising, sustainable, and viable alternate sources to cater to the incessant demands of renewable energy storage. Germane to our effort in this field, we report easily synthesizable and very cost-effective isoperthiocyanic acid (IPA) molecular complexes as electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under acidic and alkaline conditions. The Pd(II)IPA, Co(II)IPA, and Ni(II)IPA complexes were synthesized and were evaluated for HER and OER applications. These complexes when embedded onto graphitized carbon cloth (GrCC) exhibited a significant enhancement in the HER activity in contrast to their pristine counterparts. The hybrid electrocatalyst Pd(II)IPA among the three showed an extremely low overpotential of 94.1 mV to achieve a current density of 10 mA cm –2 , while Co(II)IPA and Ni(II)IPA complexes showed overpotentials of 367 and 394 mV, respectively, to achieve a current density of 10 mA cm –2 . These complexes on carbon cloth showed decreased charge transfer resistance compared to that of pristine metal complexes. The enhanced catalytic activity of the complexes on carbon cloth can be attributed to the porous and conducting nature of the graphitized carbon cloth. For OER activity, the Pd(II)IPA complex showed an excellent performance with an overpotential value of 210 mV, while Co(II)IPA and Ni(II)IPA exhibited overpotentials of 400 and 270 mV, respectively, to drive a current density of 10 mA cm –2 in 0.1 M KOH. This work further widens the scope and application of molecular complexes in combination with an excellent carbon support for renewable energy storage applications.

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Highly efficient oxygen evolution catalysis achieved by NiFe oxyhydroxide clusters anchored on carbon black

Abstract: The sluggish kinetics of oxygen evolution reaction restricts the efficiency of renewable energy storage and conversion devices including water splitting and metal-air battery. Owing to their rich misaligned atoms and...

Cited by 19 publications

References 58 publications

Highly Efficient Methanol Oxidation Reaction Achieved by Cobalt Doping in Delafossite AgNi_1–xCo_xO₂ Solid Solution

Highly Efficient Methanol Oxidation Reaction Achieved by Cobalt Doping in Delafossite AgNi_1–xCo_xO₂ Solid Solution

Boosting the Activity of Single-Atom Pt₁/CeO₂ via Co Doping for Low-Temperature Catalytic Oxidation of CO

Graphitic Carbon Cloth-Based Hybrid Molecular Catalyst: A Non-conventional, Synthetic Strategy of the Drop Casting Method for a Stable and Bifunctional Electrocatalyst for Enhanced Hydrogen and Oxygen Evolution Reactions

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Highly efficient oxygen evolution catalysis achieved by NiFe oxyhydroxide clusters anchored on carbon black

Abstract: The sluggish kinetics of oxygen evolution reaction restricts the efficiency of renewable energy storage and conversion devices including water splitting and metal-air battery. Owing to their rich misaligned atoms and...

Cited by 19 publications

References 58 publications

Highly Efficient Methanol Oxidation Reaction Achieved by Cobalt Doping in Delafossite AgNi1–xCoxO2 Solid Solution

Highly Efficient Methanol Oxidation Reaction Achieved by Cobalt Doping in Delafossite AgNi1–xCoxO2 Solid Solution

Boosting the Activity of Single-Atom Pt1/CeO2 via Co Doping for Low-Temperature Catalytic Oxidation of CO

Graphitic Carbon Cloth-Based Hybrid Molecular Catalyst: A Non-conventional, Synthetic Strategy of the Drop Casting Method for a Stable and Bifunctional Electrocatalyst for Enhanced Hydrogen and Oxygen Evolution Reactions

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Highly Efficient Methanol Oxidation Reaction Achieved by Cobalt Doping in Delafossite AgNi_1–xCo_xO₂ Solid Solution

Highly Efficient Methanol Oxidation Reaction Achieved by Cobalt Doping in Delafossite AgNi_1–xCo_xO₂ Solid Solution

Boosting the Activity of Single-Atom Pt₁/CeO₂ via Co Doping for Low-Temperature Catalytic Oxidation of CO