A Gibeon meteorite yields a high-performance water oxidation electrocatalyst

Formal, Florian Le; Guijarro, Néstor; Bourée, Wiktor S.; Gopakumar, Aswin; Prévot, Mathieu S.; Daubry, Albert; Lombardo, Loris; Sornay, Charlotte; Voit, Julie; Magrez, Arnaud; Dyson, Paul J.; Sivula, Kevin

doi:10.1039/c6ee02375d

Cited by 35 publications

(29 citation statements)

References 56 publications

(80 reference statements)

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“…As with many metal oxide catalysts the performance improved with potential cycling . Notably however, only 5 cycles were required to activate the catalyst for the best OER performance (Figure S2) which is significantly less when compared to a previous study on a Gibeon meteorite that required 20 h of ageing for optimal performance . Therefore all the data shown in Figure a was for the 5 th potential cycle.…”

Section: Resultsmentioning

confidence: 83%

“…Recently Pentlandite rocks which contain these elements showed activity for the HER under acidic conditions . It has also been reported that a Gibeon meteorite was active for the OER; however, electrochemical restructuring for many hours was required to enrich the surface with oxides of Co−Ni−Fe . Recently it was discovered that an iron ore when covered by a thin layer of NiOOH showed good OER activity under alkaline conditions which again took advantage of the synergy between Fe and Ni for this reaction .…”

Section: Introductionmentioning

confidence: 99%

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Harnessing Native Iron Ore as an Efficient Electrocatalyst for Overall Water Splitting

2019

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Electrochemical water splitting is a widely accepted approach to generate hydrogen at a scale that is suitable for storing renewable energy. Therefore, the choice of catalyst for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are critical in terms of cost when scaling up this technology. Thus, earth abundant transition metals oxides and sulfides have received significant attention as catalysts for the OER and HER, respectively. However, very few examples of actual Earth abundant materials mined from the Earth's crust have been used as electrocatalysts for these reactions. Here, we demonstrate that a raw iron ore is active for both the HER and OER under alkaline conditions, which is due to the natural abundance of the key elements of iron, nickel, and sulfur. The catalyst is stable for both reactions and can operate at 100 mA cm À 2 , which is comparable to many chemically synthesised nanomaterials based on these elements. This approach may be attractive for adding value to iron ore while minimising the cost of catalyst production.[a] Dr.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Harnessing Native Iron Ore as an Efficient Electrocatalyst for Overall Water Splitting

2019

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“…[1][2][3][4][5] Electrochemical splitting of water,a s widely accepted, is one of the most expedient and environmentally friendly techniques for the possible clean production of hydrogen energy. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] However,t he efficiencyo ft his methodi sm ainly restricted by the sluggish anodic oxygen evolution reaction (OER), the rate-limitings tep for overall water splitting, which involves four sequential proton-coupled electron-transfer steps and the formation of an oxygenoxygen bond. [26][27][28][29] Generally,p recious-metal oxidess uch as IrO 2 and RuO 2 are seen as benchmark OER catalysts owing to low overpotentials, especially on the anode side.…”

Section: Introductionmentioning

confidence: 99%

Free‐Sustaining Three‐Dimensional S235 Steel‐Based Porous Electrocatalyst for Highly Efficient and Durable Oxygen Evolution

et al. 2018

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A novel oxygen evolution reaction (OER) catalyst (3 D S235-P steel) based on a steel S235 substrate was successfully prepared by facile one-step surface modification. The standard carbon-manganese steel was phosphorized superficially, which led to the formation of a unique 3 D interconnected nanoporous surface with a high specific area that facilitated the electrocatalytically initiated oxygen evolution reaction. The prepared 3 D S235-P steel exhibited enhanced electrocatalytic OER activities in the alkaline regime, as confirmed by a low overpotential (326 mV at a 10 mA cm ) and a small Tafel slope of 68.7 mV dec . Moreover, the catalyst was found to be stable under long-term usage conditions, functioning as an oxygen-evolving electrode at pH 13, as evidenced by the sufficient charge-to-oxygen conversion rate (faradaic efficiency: 82.11 and 88.34 % at 10 and 5 mA cm , respectively). In addition, it turned out that the chosen surface modification delivered steel S235 as an OER electrocatalyst that was stable under neutral pH conditions. Our investigation revealed that the high catalytic activities likely stemmed from the generated Fe/(Mn) hydroxide/oxohydroxides generated during the OER process. Phosphorization treatment therefore not only is an efficient way to optimize the electrocatalytic performance of standard carbon-manganese steel but also enables for the development of low-costing and abundant steels in the field of energy conversion.

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“…Currently, electrocatalysts, even when based on non-noble metals, are known to be efficient and durable toward OER at high pH values. 1,[14][15][16][17][18][19] However, alkaline electrolyzers are less resistant against fre-quently occurring changes of the current load. 1 Proton exchange membrane (PEM) electrolyzers not only benefit from higher gas purity and higher efficiency, but also are suitable for the storage of renewable energy which is basically charac-terized by high dynamics.…”

Section: Introductionmentioning

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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A Gibeon meteorite yields a high-performance water oxidation electrocatalyst

Abstract: A natural material of extra-terrestrial origin yields a high-performance electrocatalyst for alkaline water oxidation.

Cited by 35 publications

References 56 publications

Harnessing Native Iron Ore as an Efficient Electrocatalyst for Overall Water Splitting

Harnessing Native Iron Ore as an Efficient Electrocatalyst for Overall Water Splitting

Free‐Sustaining Three‐Dimensional S235 Steel‐Based Porous Electrocatalyst for Highly Efficient and Durable Oxygen Evolution

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

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