Noble metal-free bifunctional oxygen evolution and oxygen reduction acidic media electro-catalysts

Patel, Prasad Prakash; Datta, Moni Kanchan; Velikokhatnyi, Oleg I.; Kuruba, Ramalinga; Damodaran, Krishnan; Jampani, Prashanth H.; Gattu, Bharat; Shanthi, Pavithra Murugavel; Damle, Sameer S.; Kumta, Prashant N.

doi:10.1038/srep28367

Cited by 111 publications

(78 citation statements)

References 48 publications

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“…An F-doped CuMn-oxide based OER-and oxygen reduction electrode intended to be suitable for electro-catalysis in sulfuric acid was recently shown. 42 Unfortunately, a detailed evaluation of the mass loss during usage has not been shown. In addition, the OER activity, when derived from chronopotentiometry data, was mediocre (η = 320 mV at ∼1.5 mA cm −2 in 0.5 M H 2 SO 4 ).…”

Section: Oer Properties Of Surface Modified Steelsmentioning

confidence: 99%

Electro-oxidation of a cobalt based steel in LiOH: a non-noble metal based electro-catalyst suitable for durable water-splitting in an acidic milieu

et al. 2017

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The use of proton exchange membrane (PEM) electrolyzers is the method of choice for the conversion of solar energy when frequently occurring changes of the current load are an issue. However, this technique requires electrolytes with low pH. All oxygen evolving electrodes working durably and actively in acids contain IrOx. Due to their scarcity and high acquisition costs, noble elements like Pt, Ru and Ir need to be replaced by earth abundant elements. We have evaluated a cobalt containing steel for use as an oxygen-forming electrode in H2SO4. We found that the dissolving of ingredients out of the steel electrode at oxi-dative potential in sulfuric acid, which is a well-known, serious issue, can be substantially reduced when the steel is electro-oxidized in LiOH prior to electrocatalysis. Under optimized synthesis conditions a cobalt-containing tool steel was rendered into a durable oxygen evolution reaction (OER) electrocatalyst (weight loss: 39 µg mm −2 after 50 000 s of chronopotentiometry at pH 1) that exhibits overpotentials down to 574 mV at 10 mA cm −2 current density at pH 1. Focused ion beam SEM (FIB-SEM) was success-fully used to create a structure-stability relationship.

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Section: Oer Properties Of Surface Modified Steelsmentioning

confidence: 99%

Electro-oxidation of a cobalt based steel in LiOH: a non-noble metal based electro-catalyst suitable for durable water-splitting in an acidic milieu

et al. 2017

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“…Various non-noble materials have been developed for ORR or OER [4][5][6][7][8], including but not limited to carbon, polymer,…”

Section: Introductionmentioning

confidence: 99%

Efficiently Enhancing Electrocatalytic Activity of α-MnO2 Nanorods/N-Doped Ketjenblack Carbon for Oxygen Reduction Reaction and Oxygen Evolution Reaction Using Facile Regulated Hydrothermal Treatment

Wang

Chen

et al. 2018

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Scalable, low-cost and highly efficient catalysis of oxygen electrocatalytic reactions (ORR/OER) are required for the rapid development of clean and renewable energy conversion/storage technologies. Herein, two types of α-MnO 2 nanorods were prepared under hydrothermal treatment at 150 • C for 0.5 h (MnO 2 -150-0.5) or 120 • C for 12 h (MnO 2 -120-12), then supported on N-doped ketjenblack carbon (N-KB) as bi-functional ORR/OER catalysts. Their electrocatalytic activities toward ORR and OER were investigated systematically. As a result, MnO 2 -150-0.5/N-KB displays superior ORR catalytic activity, with much more positive half-wave potential and much larger limiting current density (0.76 V and 6.0 mA cm −2 ), comparable to those of 20 wt. % Pt/C (0.82 V and 5.10 mA cm −2 ). MnO 2 -150-0.5/N-KB also shows high electron transfer number (3.86~3.97) and low yield of peroxides (1-7%) during ORR process in the whole potential range of 0-1.0 V (vs. RHE). Meanwhile, the MnO 2 -150-0.5/N-KB also exhibits better OER activity with low overpotential, comparable to IrO 2 /N-KB. The excellent electrocatalytic activity of MnO 2 -150-0.5/N-KB can be attributed to the synergistic effect, relatively smaller size, higher amount of Mn 3+ , and low charge transfer resistance. This work offers a new strategy for scalable preparation of more efficient and cost-effective α-MnO 2 bi-functional oxygen catalysts.

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“…Development of low‐cost, efficient and environment friendly materials are more attractive for the commercialization of electrochemical energy conversion and storage devices . The design and development of bi‐functional electrocatalyst for oxygen electrode reactions (OER/ORR) are more desirable in regenerative fuel cell, metal/air batteries .…”

Section: Introductionmentioning

confidence: 99%

2D and 3D Silica‐Template‐Derived MnO₂ Electrocatalysts towards Enhanced Oxygen Evolution and Oxygen Reduction Activity

et al. 2018

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In this work, a hard‐template‐based nano‐replication process is employed to prepare mesoporous MnO2 materials. We adopted four silica materials, namely, SBA‐15, KIT‐6, MCM‐41, and MCM‐48 as templates to prepare MnO2 materials by using a nanocasting route. The structural characteristics of the resultant MnO2 materials were thoroughly investigated by using XRD, BET, FESEM, HR‐TEM, XPS, and Raman techniques. All studies confirmed the replication of porous MnO2 nanostructures from silica supports in β‐crystallographic form. By employing X‐ray absorption near‐edge structure (XANES) and extended X‐ray absorption fine structure (EXAFS), we identified the existence of Mn and oxygen vacancies in the developed MnO2 material. The hydrodynamic linear sweep voltammetric technique was employed to demonstrate the efficient oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) activity of the catalyst in 0.1 M KOH solution. The KIT‐6‐derived MnO2 nanostructure displayed equal activity to the benchmark catalyst RuO2. This work lays a foundation to prepare and employ ordered mesoporous MnO2 materials as OER/ORR catalysts, which have potential applications in electrochemical energy conversion and storage devices.

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Noble metal-free bifunctional oxygen evolution and oxygen reduction acidic media electro-catalysts

Cited by 111 publications

References 48 publications

Electro-oxidation of a cobalt based steel in LiOH: a non-noble metal based electro-catalyst suitable for durable water-splitting in an acidic milieu

Electro-oxidation of a cobalt based steel in LiOH: a non-noble metal based electro-catalyst suitable for durable water-splitting in an acidic milieu

Efficiently Enhancing Electrocatalytic Activity of α-MnO2 Nanorods/N-Doped Ketjenblack Carbon for Oxygen Reduction Reaction and Oxygen Evolution Reaction Using Facile Regulated Hydrothermal Treatment

2D and 3D Silica‐Template‐Derived MnO₂ Electrocatalysts towards Enhanced Oxygen Evolution and Oxygen Reduction Activity

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Noble metal-free bifunctional oxygen evolution and oxygen reduction acidic media electro-catalysts

Cited by 111 publications

References 48 publications

Electro-oxidation of a cobalt based steel in LiOH: a non-noble metal based electro-catalyst suitable for durable water-splitting in an acidic milieu

Electro-oxidation of a cobalt based steel in LiOH: a non-noble metal based electro-catalyst suitable for durable water-splitting in an acidic milieu

Efficiently Enhancing Electrocatalytic Activity of α-MnO2 Nanorods/N-Doped Ketjenblack Carbon for Oxygen Reduction Reaction and Oxygen Evolution Reaction Using Facile Regulated Hydrothermal Treatment

2D and 3D Silica‐Template‐Derived MnO2 Electrocatalysts towards Enhanced Oxygen Evolution and Oxygen Reduction Activity

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2D and 3D Silica‐Template‐Derived MnO₂ Electrocatalysts towards Enhanced Oxygen Evolution and Oxygen Reduction Activity