Enhanced electrochemical performances of heteroatom-enriched carbon with hierarchical pores prepared by trehalose as a pore-forming agent and a simple one-step carbonization/activation process for supercapacitors

Wang, Chenlong; Sun, Ting; Zhang, Xugang; Chu, Mingna; Lv, Shixian; Xiang, Junyu; Wang, JinShuang; Ma, Yongjun; Qin, Chuanli

doi:10.1007/s10854-018-9039-7

Cited by 9 publications

(9 citation statements)

References 48 publications

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“…HDC 2 delivers an energy density of 8.4 Wh kg À1 at a power density of 150 W kg À1 and retains an energy density of 7 Wh kg À1 at a high power density of 6000 W kg À1 , higher than other HDCs in this work and many previously reported carbonbased supercapacitors. [24,[33][34][35][36][37][38][39]…”

Section: Electrochemical Performancementioning

confidence: 99%

Surfactant‐Directed Engineering of Hierarchical Porous Heteroatom‐Doped Carbons for High‐Energy Supercapacitors

et al. 2020

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Hierarchical porous heteroatom–doped carbons (HDCs) are readily fabricated through direct carbonization of polyimide precursors obtained in the presence of cetyltrimethylammonium bromide as a structure‐directing agent, showcasing tunable morphologies and porosities. The symmetric supercapacitor assembled by the optimized HDC electrodes with an aqueous electrolyte delivers a high specific capacitance (168 F g−1 at 0.5 A g−1), excellent rate capability (83.3% retention from 0.5 to 20 A g−1), and outstanding cycling stability (almost no capacitance fading after 10 000 cycles). Furthermore, the cell possesses a remarkable energy density of 8.4 Wh kg−1 at a power density of 150 W kg−1 and still maintains an energy density of 7 Wh kg−1 even at a high power density of 6000 W kg−1. Such exceptional supercapacitive performance shall be credited to the enlarged accessible surface area and pore volume for sufficient electrolyte contact and reservoir, chemically doped carbon skeleton for refined wettability, and high electronic conductivity as well as additional pseudocapacitive behavior. This work may open up a new possibility for fabricating low‐cost, lightweight, and durable supercapacitors with balanced energy and power delivery.

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Section: Electrochemical Performancementioning

confidence: 99%

Surfactant‐Directed Engineering of Hierarchical Porous Heteroatom‐Doped Carbons for High‐Energy Supercapacitors

et al. 2020

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“…For example, the presence of boron 3 , nitrogen 4 , phosphorus 5 , or sulfur 6 can confer acid/alkali properties to carbon materials and improve the Faraday interaction between electrolyte ions and functional groups, thereby increasing the specific capacitance through the pseudo capacitance effect. 7 Among the various heteroatoms, the presence of nitrogen and oxygen atoms can not only enhance the surface tension, wettability, and hydrophilicity of the electrode, but also elevate the inhomogeneity arising from moderate structural defects. In addition, the electron donor characteristics of the carbon matrix can also be optimized.…”

Section: Introductionmentioning

confidence: 99%

Preparation of N/O co-doped porous carbon by a one-step activation method for supercapacitor electrode materials

Liu

Ding

et al. 2022

RSC Adv.

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“…34−37 Inspired by the phenomenon of the well-known cation ion intercalation of graphite cathodes in potassium-ion batteries, 38−40 we believe that increasing interplanar spacings of the carbon layers is a smart route to exploit adequately the active sites inside the catalysts because the wider spacings make it easier for oxygen molecules to travel through the interior of the carbon layers. 28,29 In this way, special structural trehalose with an underlying layered structure seems to be the ideal carbon source for Fe−N−C due to its broad interplanar spacings after carbonization, 41 by a raid of abundant pores for dispersing of Fe ions in it. 42,43 Herein, using trehalose as structure forming template, a novel candied haws-like Fe−N−C catalyst (CH-FeNC), composed of trehalose, PANI, and ZIF8 precursors, was fabricated first by a two-step synthesis strategy via raw material morphology and structure design and controllable pyrolysis carbonization.…”

Section: Introductionmentioning

confidence: 99%

Candied Haws-Like Fe–N–C Catalysts with Broadened Carbon Interlayer Spacing for Efficient Zinc–Air Battery

Zhang

Sun

Xiao

et al. 2022

ACS Appl. Mater. Interfaces

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As efficient nonprecious metal catalysts for oxygen reduction reaction (ORR), Fe−N−C materials are one of the most promising alternatives to Pt-based catalysts for fuel cells and metal−air batteries. However, the intrinsically low density of key active sites like FeN 4 moieties hampers their commercial applications. Herein, we provide a smart strategy to construct a candied haws-like Fe−N−C catalyst (CH-FeNC) with broadened carbon interplanar spacing (>4 Å), starting with trehalose as a structure-built brick coupled with a zinc-zeolite imidazole framework (ZIF-8) and polyaniline (PANI) and then followed by copyrolysis carbonization of them. The obtained CH-FeNC exhibits half-wave potentials of 0.92 and 0.90 V (vs RHE) before and after 10,000 cycles in 0.1 M KOH, which are superior to the 0.90 and 0.85 V obtained by commercial Pt/C for ORR. The power density of a homemade zinc−air battery equipped with the catalyst is up to 131 mW cm −2 , greater than that of Pt/C (124 mW cm −2 ). The extended X-ray absorption fine structure (EXAFS) results and density functional theory (DFT) theoretical calculations reveal that there exists enriched zigzag or armchair edge-hosted FeN 4 active sites, located at the abundant interface between carbon components in this composite. Furthermore, the unique broadened carbon interlayer spacing plays a key role in deciding the ORR rate in alkaline but not in acidic environments because there exists a fifth ligand of active Fe in the form of FeN 4 centers coupled with SO 4 2− and ClO 4 − from acids.

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Enhanced electrochemical performances of heteroatom-enriched carbon with hierarchical pores prepared by trehalose as a pore-forming agent and a simple one-step carbonization/activation process for supercapacitors

Cited by 9 publications

References 48 publications

Surfactant‐Directed Engineering of Hierarchical Porous Heteroatom‐Doped Carbons for High‐Energy Supercapacitors

Surfactant‐Directed Engineering of Hierarchical Porous Heteroatom‐Doped Carbons for High‐Energy Supercapacitors

Preparation of N/O co-doped porous carbon by a one-step activation method for supercapacitor electrode materials

Candied Haws-Like Fe–N–C Catalysts with Broadened Carbon Interlayer Spacing for Efficient Zinc–Air Battery

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