Intrinsically stable in situ generated electrocatalyst for long-term oxidation of acidic water at up to 80 °C

Chatti, Manjunath; Gardiner, James L.; Fournier, Maxime; Johannessen, Bernt; Williams, Tim; Gengenbach, Thomas R.; Pai, Narendra; Nguyen, Cuc; MacFarlane, Douglas R.; Hocking, Rosalie K.; Simonov, Alexandr N.

doi:10.1038/s41929-019-0277-8

Cited by 159 publications

(168 citation statements)

References 63 publications

(114 reference statements)

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“…The as‐prepared CoFePbO x could operate at 1 mA cm −2 in sulfate buffer at pH = 2.0 for more than 50 h at 1.8 V. Even though FeO x is unstable at high potential, the slight incorporation of Fe contributes to the stability of the catalysts. By introducing the “self‐repair” mechanism, this kind of structure could even work at 80 °C and 500 mA cm −2 with overpotentials below 0.7 V. [ 182 ] Ag doped Co 3 O 4 prepares by the annealing of Co 3 O 4 nanowire on Ag film also enhanced OER performance compared to pristine Co 3 O 4 . [ 48 ] The high conductivity and stability of Ag in H 2 SO 4 would improve the OER performance of the catalyst in acid, thus resulting in an overpotential of 670 mV at 10 mA cm −2 and a nearly constant current response at an overpotential of 370 mV for 10 h. Recently, Co‐containing polyoxometalates (Co‐POMs) are investigated as a promising catalyst for acidic water oxidation.…”

Section: Nonprecious Metal‐based Oer Catalystsmentioning

confidence: 99%

Recent Progress in Electrocatalysts for Acidic Water Oxidation

Lei

Wang

Zhao

et al. 2020

Advanced Energy Materials

205

161

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Hydrogen is a clean and renewable energy carrier for powering future transportation and other applications. Water electrolysis is a promising option for hydrogen production from renewable resources such as wind and solar energy. To date, tremendous efforts have been devoted to the development of electrocatalysts and membranes for water electrolysis technology. In principle, water electrolysis in acidic media has several advantages over that in alkaline media, including favorable reaction kinetics, easy product separation, and low operating pressure. However, acidic water electrolysis poses higher requirements for the catalysts, especially the ones for the oxygen evolution reaction. It is a grand challenge to develop highly active, durable, and cost‐effective catalysts to replace precious metal catalysts for acidic water oxidation. In this article, an overview is presented of the latest developments in design and synthesis of electrocatalysts for acidic water oxidation, emphasizing new strategies for achieving high electrocatalytic activity while maintaining excellent durability at low cost. In particular, the reaction pathways and intermediates are discussed in detail to gain deeper insight into the oxygen evolution reaction mechanism, which is vital to rational design of more efficient electrocatalysts. Further, the remaining scientific challenges and possible strategies to overcome them are outlined, together with perspectives for future‐generation electrocatalysts that exploit nanoscale materials for water electrolysis.

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Section: Nonprecious Metal‐based Oer Catalystsmentioning

confidence: 99%

Recent Progress in Electrocatalysts for Acidic Water Oxidation

Lei

Wang

Zhao

et al. 2020

Advanced Energy Materials

205

161

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“…[ 2 ] In the last few years, TMD‐based catalysts have been optimized by introducing additional basal‐plane vacancies and metastable metallic crystal structures to overcome their low concentration of electrocatalytic activity sites and poor intrinsic electroconductibility; thus, the catalysts exhibited much enhanced HER catalytic activity. [ 3 ] In addition to achieving significant advances in structural designs, other driving forces, such as thermal energy, [ 4 ] field effect, [ 5 ] and strain engineering, [ 6 ] have also been utilized to boost the HER performance of electrocatalysts. [ 7 ] Because solar energy is an available clean and sustainable energy, solar‐driven photocatalytic and photoelectrochemical water splitting has become one of the hottest topics in materials science.…”

Section: Figurementioning

confidence: 99%

Dual‐Enhanced Doping in ReSe₂ for Efficiently Photoenhanced Hydrogen Evolution Reaction

Wang

Han

et al. 2020

Advanced Science

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metal dichalcogenides (TMDs) are a typical 2D nanomaterial and have shown substantial progress in terms of catalysis and energy storage applications. [2] In the last few years, TMD-based catalysts have been optimized by introducing additional basalplane vacancies and metastable metallic crystal structures to overcome their low concentration of electrocatalytic activity sites and poor intrinsic electroconductibility; thus, the catalysts exhibited much enhanced HER catalytic activity. [3] In addition to achieving significant advances in structural designs, other driving forces, such as thermal energy, [4] field effect, [5] and strain engineering, [6] have also been utilized to boost the HER performance of electrocatalysts. [7] Because solar energy is an available clean and sustainable energy, solar-driven photocatalytic and photoelectrochemical water splitting has become one of the hottest topics in materials science. [8] Rhenium dichalcogenides (ReX 2 , X = S or Se) are a unique category of compounds that have both distorted triclinic symmetry (1T) crystal structure and excellent photoelectric properties with weak interlayer coupling; these characteristics ensure their excellent Rhenium dichalcogenides (ReX 2 , X = S or Se) are catalysts that have great promise for the photoenhanced hydrogen evolution reaction (PE-HER) because of their unique physiochemical properties. However, the catalytic performance is still restricted by their low concentration of electrocatalytic activity sites and poor injection of hot electrons. Herein, dual-enhancement in ReSe 2 nanosheets (NSs) with high concentration of active sites and efficient use of hot electrons is simultaneously achieved with moderate Mo doping. Contributions from exposed catalytically active sites, improved electrical conductivity, and enhanced solar spectral response are systematically investigated. Superior PE-HER catalytical performance is obtained in Re 0.94 Mo 0.06 Se 2 , which has more catalytically active sites and optimized band structure than other Re 1−x Mo x Se 2 samples. Here, it is demonstrated that only doping can reduce the overpotential (η 10 ) from 239 to 174 mV at −10 mA cm −2 (Δ1η 10 = 65 mV). Then, η 10 is further improved to 137 mV under simulated AM 1.5 sun illumination (Δ2η 10 = 37 mV). The total improvement (Δη 10 ) toward PE-HER is 102 mV (Δ1η 10 + Δ2η 10 = 102 mV) in optimal Re 0.94 Mo 0.06 Se 2 . This work presents a new perspective for researching highefficiency photoenhanced HER ReSe 2 -based electrocatalysts and other layered transition metal dichalcogenides. Figure 4. XANES spectra (inset in panel (a)) and a) EXAFS spectra of the as-exfoliated ReSe 2 and Re 0.94 Mo 0.06 Se 2 NSs. b) Density functional theory schematic diagram. c) HER free-energy diagram. d) Density of states plots for monolayers of ReSe 2 , Re 0.94 Mo 0.06 Se 2 , and MoSe 2 . e-g) Schematic diagrams of the separation and recombination process for an electron-hole in Re 1−x Mo x Se 2 . www.advancedsciencenews.com 2000216 (7 of 7)

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“…Bi‐ and multi‐nuclear‐TM (pre)catalysts have proven to be superior to mononuclear ones, as the variation of the metal composition enables the tuning of the intrinsic properties affecting the OER . In this regard, it has been shown that an multinuclear assembling of metals helps to vary adsorption energies and can afford higher stabilities, conductivities and surface areas of OER catalysts.…”

Section: Introductionmentioning

confidence: 99%

Stannites – A New Promising Class of Durable Electrocatalysts for Efficient Water Oxidation

et al. 2020

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The oxygen evolution reaction (OER) through water oxidation is a key process for multiple energy storage technologies required for a sustainable energy economy such as the formation of the fuel hydrogen from water and electricity, or metal‐air batteries. Herein, we investigate the suitability of Cu2FeSnS4 for the OER and demonstrate its superiority over iron sulfide, iron (oxy)hydroxides and benchmark noble‐metal catalysts in alkaline media. Electrodeposited Cu2FeSnS4 yields the current densities of 10 and 1000 mA/cm2 at overpotentials of merely 228 and 330 mV, respectively. State‐of‐the‐art analytical methods are applied before and after electrocatalysis to uncover the fate of the Cu2FeSnS4 precatalyst under OER conditions and to deduce structure‐activity relationships. Cu2FeSnS4 is the first compound reported for OER among the broad class of stannite structure type materials containing multiple members with highly active earth‐abundant transition‐metals for OER.

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Intrinsically stable in situ generated electrocatalyst for long-term oxidation of acidic water at up to 80 °C

Cited by 159 publications

References 63 publications

Recent Progress in Electrocatalysts for Acidic Water Oxidation

Recent Progress in Electrocatalysts for Acidic Water Oxidation

Dual‐Enhanced Doping in ReSe₂ for Efficiently Photoenhanced Hydrogen Evolution Reaction

Stannites – A New Promising Class of Durable Electrocatalysts for Efficient Water Oxidation

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Intrinsically stable in situ generated electrocatalyst for long-term oxidation of acidic water at up to 80 °C

Cited by 159 publications

References 63 publications

Recent Progress in Electrocatalysts for Acidic Water Oxidation

Recent Progress in Electrocatalysts for Acidic Water Oxidation

Dual‐Enhanced Doping in ReSe2 for Efficiently Photoenhanced Hydrogen Evolution Reaction

Stannites – A New Promising Class of Durable Electrocatalysts for Efficient Water Oxidation

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Dual‐Enhanced Doping in ReSe₂ for Efficiently Photoenhanced Hydrogen Evolution Reaction