Texturing in situ: N,S-enriched hierarchically porous carbon as a highly active reversible oxygen electrocatalyst

Pei, Zengxia; Li, Hongfei; Huang, Yan; Xue, Qi; Huang, Yang; Zhu, Minshen; Wang, Zifeng; Chen, Zhi

doi:10.1039/c6ee03265f

Cited by 453 publications

(263 citation statements)

References 39 publications

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“…Other literatures also reported similar ORR/OER catalyst using heteroatom-doped carbon materials with a metric potential difference of 0.72 and 0.88 V, respectively. [79,80] …”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Huang

Wang

Peng

et al. 2017

Advanced Energy Materials

709

448

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Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are the two most important reactions in rechargeable metal‐air battery, a promising technology to meet the energy requirements for various applications. The development of low‐cost, highly efficient and stable bifunctional ORR/OER catalysts is critical for a large‐scale application of this technology. In this review, the authors first introduce the fundamentals of bifunctional ORR/OER electrocatalysis in alkaline electrolyte. Various types of nanostructured materials as bifunctional ORR/OER catalysts including metal oxide, hydroxide and sulfide, functional carbon material, metal, and their composites are then reviewed. The crucial factors that can be used to tune the activity of the catalyst towards ORR/OER are summarized, including (1) phase, morphology, crystal facet, defect, mixed‐metal and strain engineering for metal oxide; (2) heteroatom doping, topological defects, and formation of metal‐N‐C structure for carbon material; (3) alloy effect for metal. These experiences lay the foundation for large scale application of metal‐air battery and can also effectively guide the rational design of catalysts for other electrocatalytic reactions.

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“…Other literatures also reported similar ORR/OER catalyst using heteroatom-doped carbon materials with a metric potential difference of 0.72 and 0.88 V, respectively. [79,80] …”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Huang

Wang

Peng

et al. 2017

Advanced Energy Materials

709

448

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“…[1][2][3][4][5] In addition, the process of assembling zinc-air battery does not require water-free and/or oxygenfree environment, which is in favor of scaling up at low cost. Meanwhile, zincair battery provides a theoretical energy density up to 1086 Wh•kg −1 , even much higher than commercial lithium-ion batteries, promising to next-generation longlasting power system.…”

mentioning

confidence: 99%

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Chen

Wang

et al. 2019

Advanced Energy Materials

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343

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remains a challenge. Meanwhile, zincair battery provides a theoretical energy density up to 1086 Wh•kg −1 , even much higher than commercial lithium-ion batteries, promising to next-generation longlasting power system. [1][2][3][4][5] In addition, the process of assembling zinc-air battery does not require water-free and/or oxygenfree environment, which is in favor of scaling up at low cost. [6][7][8][9][10] Therefore, developing stretchable zinc-air batteries with stretchability and weavability will be highly attractive as a power unit for various flexible/wearable devices.The difficulty to develop super-stretchable zinc-air battery is that it must use strong alkaline electrolyte (always 6 m KOH) to achieve decent power density considering all zinc-air batteries with neutral electrolyte possess unacceptable low power output. [11,12] On the other hand, most super-stretchable hydrogels that are considered as an essential component of a stretchable energy storage device will lose their stretchability under such strong alkaline environment. Currently, a zincair battery is typically assembled using polyvinyl alcohol (PVA)-based electrolyte. [2,[13][14][15][16][17] However, the PVA-based electrolyte possesses very poor stretchability (even worse when alkaline electrolyte infiltrated), and meanwhile it shows limited ion-transport capability, resulting in poorly electrochemical performance and mechanical flexibility. [18][19][20][21] Although other hydrogels, such as polyacrylic acid (PAA), polyacrylamide (PAM), show strong water-retention capability and high stretchability, [22,23] unfortunately, they will lose their mechanical robustness, especially the stretchability, when they are incorporated with strong alkaline electrolyte. [24][25][26] Therefore, the absence of alkaline-tolerant hydrogel electrolyte with high stretchability and excellent ion transport capability is the key challenge to fabricate super-stretchable zinc-air battery and enhance its weavability. An alternative way to fabricate stretchable zinc-air battery (very limited stretchability with a maximum strain less than 10%) has been proposed, that is to use electron/ion-inactive stretchable substrate (e.g., rubber elastomer) or strain-accommodating engineering of device structure (e.g., fiber-shaped planar structure). [27][28][29] The problem is that the stretchable components are additional, and they are not involved in any chemical reactions. In some cases, Stretchable devices need elastic hydrogel electrolyte as an essential component, while most hydrogels will lose their stretchability after being incorporated with strong alkaline solution. This is why highly stretchable zinc-air batteries have never been reported so far. Herein, super-stretchable, flat-(800% stretchable) and fiber-shaped (500% stretchable) zinc-air batteries are first developed by designing an alkaline-tolerant dual-network hydrogel electrolyte. In the dualnetwork hydrogel electrolyte, sodium polyacrylate (PANa) chains contribute to the formation of soft domains and the carboxyl gr...

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“…[1][2][3][4][5][6] Since the efficiency of overall water splitting is restricted by the sluggish kinetics of oxygen evolution reaction (OER) due to multiple proton/ electron transfer processes, [7][8][9] it is important to develop efficient OER electrocatalysts with low overpotential and high durability. [1][2][3][4][5][6] Since the efficiency of overall water splitting is restricted by the sluggish kinetics of oxygen evolution reaction (OER) due to multiple proton/ electron transfer processes, [7][8][9] it is important to develop efficient OER electrocatalysts with low overpotential and high durability.…”

Section: Electrocatalystsmentioning

confidence: 99%

“…[30,31] The harsh conditions used for carbonization of the porous coordination polymers like MOFs, in principle, could be avoided by using molecular complexes with discrete structures as the precursors. [1][2][3][4][5][6] Since the efficiency of overall water splitting is restricted by the sluggish kinetics of oxygen evolution reaction (OER) due to multiple proton/ electron transfer processes, [7][8][9] it is important to develop efficient OER electrocatalysts with low overpotential and high durability. [32] In that study, Xu and co-workers described an in situ formed OER electrocatalyst consisting of interconnected NiFe-LDH and carbon nanodomains by solvothermal reaction of Ni 2+ , Fe 3+ , and 2-mercapto-5-nitrobenzimidazole (MNBI) in N,N-dimethylformamide (DMF).…”

mentioning

confidence: 99%

Iron–Salen Complex and Co²⁺ Ion‐Derived Cobalt–Iron Hydroxide/Carbon Nanohybrid as an Efficient Oxygen Evolution Electrocatalyst

Liu

et al. 2019

Advanced Science

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Metal–salen complexes are widely used as catalysts in numerous fundamental organic transformation reactions. Here, CoFe hydroxide/carbon nanohybrid is reported as an efficient oxygen evolution electrocatalyst derived from the in situ formed molecular Fe–salen complexes and Co 2+ ions at a low temperature of 160 °C. It has been evidenced that Fe–salen as a molecular precursor facilitates the confined‐growth of metal hydroxides, while Co 2+ plays a critical role in catalyzing the transformation of organic ligand into nanocarbons and constitutes an essential component for CoFe hydroxide. The resulting Co 1.2 Fe/C hybrid material requires an overpotential of 260 mV at a current density of 10 mA cm −2 with high durability. The high activity is contributed to uniform distribution of CoFe hydroxides on carbon layer and excellent electron conductivity caused by intimate contact between metal and nanocarbon. Given the diversity of molecular precursors, these results represent a promising approach to high‐performance carbon‐based water splitting catalysts.

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Texturing in situ: N,S-enriched hierarchically porous carbon as a highly active reversible oxygen electrocatalyst

Abstract: An in situ texturing protocol is developed for preparing N,S-enriched hierarchically porous carbon as an excellent reversible oxygen electrocatalyst.

Cited by 453 publications

References 39 publications

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Iron–Salen Complex and Co²⁺ Ion‐Derived Cobalt–Iron Hydroxide/Carbon Nanohybrid as an Efficient Oxygen Evolution Electrocatalyst

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Texturing in situ: N,S-enriched hierarchically porous carbon as a highly active reversible oxygen electrocatalyst

Abstract: An in situ texturing protocol is developed for preparing N,S-enriched hierarchically porous carbon as an excellent reversible oxygen electrocatalyst.

Cited by 453 publications

References 39 publications

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Iron–Salen Complex and Co2+ Ion‐Derived Cobalt–Iron Hydroxide/Carbon Nanohybrid as an Efficient Oxygen Evolution Electrocatalyst

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Iron–Salen Complex and Co²⁺ Ion‐Derived Cobalt–Iron Hydroxide/Carbon Nanohybrid as an Efficient Oxygen Evolution Electrocatalyst