journal article·2024-05-15

High Volumetric Energy Density Supercapacitor of Additive-Free Quantum Dot Hierarchical Nanopore Structure

Muhammad Alief Irham, Ricky Dwi Septianto, Retno Dwi Wulandari, Yutaka Majima, Ferry Iskandar, Yoshihiro Iwasa, Satria Zulkarnaen Bisri

ACS Applied Materials & Interfaces· Volume 16· Issue 19
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Abstract

The high surface-area-to-volume ratio of colloidal quantum dots (QDs) positions them as promising materials for high-performance supercapacitor electrodes. However, the challenge lies in achieving a highly accessible surface area, while maintaining good electrical conductivity. An efficient supercapacitor demands a dense yet highly porous structure that facilitates efficient ion–surface interactions and supports fast charge mobility. Here we demonstrate the successful development of additive-free ultrahigh energy density electric double-layer capacitors based on quantum dot hierarchical nanopore (QDHN) structures. Lead sulfide QDs are assembled into QDHN structures that strike a balance between electrical conductivity and efficient ion diffusion by employing meticulous control over inter-QD distances without any additives. Using ionic liquid as the electrolyte, the high-voltage ultrathin-film microsupercapacitors achieve a remarkable combination of volumetric energy density (95.6 mWh cm –3 ) and power density (13.5 W cm –3 ). This achievement is attributed to the intrinsic capability of QDHN structures to accumulate charge carriers efficiently. These findings introduce innovative concepts for leveraging colloidal nanomaterials in the advancement of high-performance energy storage devices.
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Research context

OpenAlex topics: Supercapacitor Materials and Fabrication · Advancements in Battery Materials · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Faculty of Mathematics and Natural Sciences, Department of Physics, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, West Java 40132, Indonesia

Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo, Tokyo 184-8588, Japan

Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan

Research Center for Nanoscience and Nanotechnology and Research Collaboration Center for Advanced Energy Materials, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung, West Java 40132, Indonesia

Quantum Phase Electronic Center and Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Tokyo 113-8656, Japan

Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, Tokyo 152-8550, Japan

Funding

RIKEN · Dana Ilmu Pengetahuan Indonesia · Kementerian Pendidikan, Kebudayaan, Riset, dan Teknologi · Japan Society for the Promotion of Science · Lembaga Pengelola Dana Pendidikan

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