An MnNCN-Derived Electrocatalyst for CuWO<sub>4</sub> Photoanodes

Davi, Martin; Mann, Markus; Ma, Zili; Schrader, Felix; Drichel, Andreas; Budnyk, Serhiy; Rokicińska, Anna; Kuśtrowski, Piotr; Dronskowski, Richard; Slabon, Adam

doi:10.1021/acs.langmuir.8b00149

Cited by 41 publications

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“…In recent years, due to the similarities with the corresponding oxides, metal carbodiimides are considered as a kind of potential material and have been applied in many fields, such as lithium/sodium ion batteries, 15 photocatalytic CO 2 reduction, 16 and PEC water oxidation. 17 When metal carbodiimides are applied in LIBs, most of them exhibit high theoretical capacity, poor conductivity, and low initial Coulombic efficiency, which is similar to the oxides. Meanwhile, the researchers find that they show obviously different electrochemical properties due to the variation of metal.…”

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confidence: 99%

One-Step Synthesis of ZnNCN Nanoparticles with Adjustable Composition for an Advanced Anode in Lithium Ion Battery

Long

et al. 2021

ACS Appl. Energy Mater.

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Designing an anode with a low-cost and simple preparation method is the key to developing the lithium ion battery. Here, ZnNCN nanoparticles are synthesized by one-step calcination of the mixture of melamine and zinc nitrate. By adjusting the reaction temperature, the pure ZnNCN with good crystalline character is obtained. The conversion-type mechanism of ZnNCN is proved by ex situ X-ray diffraction and electrochemical curves. More importantly, ZnNCN exhibits a high discharging capacity (405 mAh g −1 at 0.1 A g −1 ), an excellent rate property (140 mAh g −1 at 3 A g −1 ), and a long cyclic life (capacity fading per cycle of 0.025% during 700 cycles at 1.0 A g −1 ). Also, this work provides a new approach to prepare metal carbodiimides.

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One-Step Synthesis of ZnNCN Nanoparticles with Adjustable Composition for an Advanced Anode in Lithium Ion Battery

Long

et al. 2021

ACS Appl. Energy Mater.

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“…The observed PEC behavior of Bi 2 O 2 NCN is different from CoNCN, which retains the same chemical composition on the surface and the bulk but is similar to MnNCN. 44 , 47 The latter is known to form an amorphous manganese phosphate shell.…”

Section: Resultsmentioning

confidence: 99%

Tailoring the Surface Properties of Bi₂O₂NCN by in Situ Activation for Augmented Photoelectrochemical Water Oxidation on WO₃ and CuWO₄ Heterojunction Photoanodes

et al. 2020

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Bismuth(III) oxide-carbodiimide (Bi 2 O 2 NCN) has been recently discovered as a novel mixed-anion semiconductor, which is structurally related to bismuth oxides and oxysulfides. Given the structural versatility of these layered structures, we investigated the unexplored photochemical properties of the target compound for photoelectrochemical (PEC) water oxidation. Although Bi 2 O 2 NCN does not generate a noticeable photocurrent as a single photoabsorber, the fabrication of heterojunctions with the WO 3 thin film electrode shows an upsurge of current density from 0.9 to 1.1 mA cm –2 at 1.23 V vs reversible hydrogen electrode (RHE) under 1 sun (AM 1.5G) illumination in phosphate electrolyte (pH 7.0). Mechanistic analysis and structural analysis using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and scanning transmission electron microscopy energy-dispersive X-ray spectroscopy (STEM EDX) indicate that Bi 2 O 2 NCN transforms during operating conditions in situ to a core–shell structure Bi 2 O 2 NCN/BiPO 4 . When compared to WO 3 /BiPO 4 , the in situ electrolyte-activated WO 3 /Bi 2 O 2 NCN photoanode shows a higher photocurrent density due to superior charge separation across the oxide/oxide-carbodiimide interface layer. Changing the electrolyte from phosphate to sulfate results in a lower photocurrent and shows that the electrolyte determines the surface chemistry and mediates the PEC activity of the metal oxide-carbodiimide. A similar trend could be observed for CuWO 4 thin film photoanodes. These results show the potential of metal oxide-carbodiimides as relatively novel representatives of mixed-anion compounds and shed light on the importance of the control over the surface chemistry to enable the in situ activation.

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“…[ 138 ] This core–shell formation process does not only occur for metal phosphides. Metal borides [ 142 ] and metal carbodiimides [ 143 ] also transform during PEC operation. Apart from the possibilities described above, Jin has also pointed out the probable formation of metastable phases and synergistic electronic interactions between different components in such transformable systems.…”

Section: Elements Complements and Combinations Of Oecsmentioning

confidence: 99%

Oxygen Evolution Catalysts at Transition Metal Oxide Photoanodes: Their Differing Roles for Solar Water Splitting

Zhang

Cui

Eslava

2021

Advanced Energy Materials

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In the field of photoelectrochemical water splitting for hydrogen production, dedicated efforts have recently been made to improve water oxidation at photoanodes, and in particular, to accelerate the poor kinetics of the oxygen evolution reaction which is a key step in achieving a viable photocurrent density for industrialization. To this end, coating the photoanode semiconductors with oxygen evolution catalysts (OECs) has been one of the most popular options. The roles of OECs have been found to be multifold, as opposed to exclusively catalytic. This review aims to unravel the complexity of the interfacial processes arising from the material properties of both semiconductors and OECs, and to rationalize the variation in findings in the literature regarding the roles of OECs. Light is also shed on some of the most useful characterization techniques that probe the dynamics of photogenerated holes, to answer some of the field's most challenging mechanistic questions. Finally, some ideas and suggestions on the design principles of OECs are proposed.

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An MnNCN-Derived Electrocatalyst for CuWO₄ Photoanodes

Cited by 41 publications

References 50 publications

One-Step Synthesis of ZnNCN Nanoparticles with Adjustable Composition for an Advanced Anode in Lithium Ion Battery

One-Step Synthesis of ZnNCN Nanoparticles with Adjustable Composition for an Advanced Anode in Lithium Ion Battery

Tailoring the Surface Properties of Bi₂O₂NCN by in Situ Activation for Augmented Photoelectrochemical Water Oxidation on WO₃ and CuWO₄ Heterojunction Photoanodes

Oxygen Evolution Catalysts at Transition Metal Oxide Photoanodes: Their Differing Roles for Solar Water Splitting

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An MnNCN-Derived Electrocatalyst for CuWO4 Photoanodes

Cited by 41 publications

References 50 publications

One-Step Synthesis of ZnNCN Nanoparticles with Adjustable Composition for an Advanced Anode in Lithium Ion Battery

One-Step Synthesis of ZnNCN Nanoparticles with Adjustable Composition for an Advanced Anode in Lithium Ion Battery

Tailoring the Surface Properties of Bi2O2NCN by in Situ Activation for Augmented Photoelectrochemical Water Oxidation on WO3 and CuWO4 Heterojunction Photoanodes

Oxygen Evolution Catalysts at Transition Metal Oxide Photoanodes: Their Differing Roles for Solar Water Splitting

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An MnNCN-Derived Electrocatalyst for CuWO₄ Photoanodes

Tailoring the Surface Properties of Bi₂O₂NCN by in Situ Activation for Augmented Photoelectrochemical Water Oxidation on WO₃ and CuWO₄ Heterojunction Photoanodes