Hierarchically Porous Carbon Materials from Self-Assembled Block Copolymer/Dopamine Mixtures

Septani, Cindy Mutiara; Wang, Chen-An; Jeng, U‐Ser; Su, Yu‐Chia; Ko, Bao‐Tsan; Sun, Ya-Sen

doi:10.1021/acs.langmuir.0c01431

Cited by 8 publications

(10 citation statements)

References 67 publications

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“…Although DA can bind with PEO chains through hydrogen bonds of catechol and amine groups in DA with ether groups in PEO, 4 the oxidation and polymerization of DA could disturb the binding of DA with PEO chains. 18 Thus, the ability of PS-b-PEO templating may not be valid for oxidized and polymerized DA. The purpose of extra HCl addition is to avoid oxidative polymerization of dopamine, to enhance binding of DA with the PEO, and to weaken inter-DA interactions.…”

Section: ■ Introductionmentioning

confidence: 99%

Oxygen Reduction Reaction of Block Copolymer Template-Directed Porous Carbon Catalysts

Septani

Wang

Sun

2021

ACS Appl. Energy Mater.

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Functional nitrogen-doped hierarchically porous carbon materials (NHPCMs) have received much attention in recent years because of their electrochemical and catalytic activities, which offer potential applications in the field of fuel cells. Herein we demonstrate the NHPCMs with superior performance of the oxygen reduction reaction (ORR) through spontaneous coassembly of polystyrene-block-poly(ethylene oxide) (PS-b-PEO) micelles along with self-polymerization of dopamine (DA). In this study, we aim to deeply understand the effects of HCl addition, DA content, and aging environment on morphologies of NHPCMs through studying self-assembly and phase behavior of PS-b-PEO/DA mixtures in cosolvent using synchrotron small-angle X-ray scattering and transmission X-ray microscopy. The morphology of hierarchical pores can be successfully obtained by fine controls over DA content and pyrolysis temperature. Correlations of morphologies and processes with the ORR performance indicate that hierarchically porous carbon materials exhibit the highest ORR performance with J k = 8.1 mA cm–2 (measured at −0.4 V of SCE), low onset potential η = −0.11 V, and four-electron transfer pathway over a wide voltage range.

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Section: ■ Introductionmentioning

confidence: 99%

Oxygen Reduction Reaction of Block Copolymer Template-Directed Porous Carbon Catalysts

Septani

Wang

Sun

2021

ACS Appl. Energy Mater.

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“…Looking forward, our strategy can be extended to other 1–3D objects such as cubes, polyhedra, nanowires, membranes, and so forth. The extended applications are also key points for us to explore directional gas/substance release for nano-/micromotor applications. , …”

Section: Discussionmentioning

confidence: 99%

Polymer Brush-Induced Hollow Colloids via Diffusion-Controlled Silication

Tian

Zhang

et al. 2020

Langmuir

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We report on a new strategy to synthesize asymmetrical hollow colloidal particles by exploiting limited chemical diffusion that occurs at the periphery of a solvated polymer brush on the particle surface. The polymer brushin our case poly(glycidyl methacrylate)bears hydroxyl groups upon hydrolysis and is partially cross-linked under the Stöber condition of silication. Desolvation of the polymers creates a cavity. While elucidating this new mechanism, we demonstrate that particles with various types of cavities and tunable properties can be synthesized, including the ones bearing hemispherical and crescent shapes, as well as particles with wrinkled surfaces. Furthermore, we show that the hollow particles adopt preferred orientations because of their shape and composition attributes, which is further explored to facilitate the confined synthesis of nanocrystals.

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“…Polystyrene-block-poly(ethylene oxide) block copolymers (PS- b -PEO BCPs) have attracted broad interest since their self-assembled nanodomains can be used as templates to make inorganic or carbon nanomaterials. − The nanomaterials based on BCP-templating have well-defined morphologies and finely tailored domain sizes. The fabrication of nanostructure materials needs a sol–gel process for solutions that contain PS- b -PEO in binary cosolvents in the presence of additives (such as bases, acids, and homopolymers). − …”

Section: Introductionmentioning

confidence: 99%

Structural Evolution of a Polystyrene-Block-Poly(Ethylene Oxide) Block Copolymer in Tetrahydrofuran/Water Cosolvents

et al. 2022

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This study aims to quantitatively investigate the effect of water content on the self-assembly behavior of polystyreneblock-poly(ethylene oxide) (PS-b-PEO) in tetrahydrofuran/water cosolvents by small-angle X-ray scattering. PS-b-PEO chains preferentially form fractal aggregates at a dilute concentration in neat tetrahydrofuran (THF). By adding a small amount of water into THF, PS-b-PEO forms gelled networks. The gelled networks have correlated inhomogeneities, which were generated through mesophase separation. These gelled networks are not present when PS-b-PEO is dissolved in THF/methanol and THF/ethanol cosolvents. The substitution of water with 12 M HCl reduces the viscosity of the gelled networks. Those results indicate that the gelled networks of PS-b-PEO need hydrogen bonds formed from surrounding water molecules to be bridging agents, which connect different PEO block chains together. Upon increasing the water content in THF/water cosolvents, dispersed micelles with a core− shell conformation or aggregated micelles preferentially coexist with fractal aggregates.

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Hierarchically Porous Carbon Materials from Self-Assembled Block Copolymer/Dopamine Mixtures

Cited by 8 publications

References 67 publications

Oxygen Reduction Reaction of Block Copolymer Template-Directed Porous Carbon Catalysts

Oxygen Reduction Reaction of Block Copolymer Template-Directed Porous Carbon Catalysts

Polymer Brush-Induced Hollow Colloids via Diffusion-Controlled Silication

Structural Evolution of a Polystyrene-Block-Poly(Ethylene Oxide) Block Copolymer in Tetrahydrofuran/Water Cosolvents

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