炭素布電極上に成膜した窒素ドープ炭素ナノ材料によるバナジウムおよびマンガンレドックス対の電気化学的強化
Electrochemical Enhancement of Vanadium and Manganese Redox Couples Using N-Doped Carbon Nanomaterials Deposited on Carbon Cloth Electrodes (原題)
Shamik Chaudhuri, Reza Afshar Ghotli, Züleyha Kudaş, Baidaa Alkhateab, Tülay Ínan, Farouq Sabri Mjalli, Süleyman Çelik, Mahmut Taş, Mustafa K. Bayazit, Serap Hayat Soytaş, Nigel P. Brandon, Barun Kumar Chakrabarti
🤖 gxceed AI 要約
日本語
窒素ドープカーボンナノチューブと窒素ドープ還元グラフェン酸化物を、バインダーを用いない水平電気泳動堆積法で炭素布電極上に直接成膜した。窒素導入による欠陥リッチなグラファイト構造が電荷移動速度を高め、界面抵抗を低減し、V2+/V3+、VO2+/VO2+、Mn2+/Mn3+の拡散係数を向上させた。全バナジウム系とバナジウム・マンガン系のフロー電池セルでピーク出力密度310および360 mW cm−2、エネルギー効率70%超、100 mA cm−2で200サイクルの安定動作を達成した。
English
Nitrogen-doped carbon nanotubes and reduced graphene oxide were deposited binder-free onto carbon cloth via horizontal electrophoretic deposition. Nitrogen-induced defect-rich graphitic domains enhanced charge-transfer kinetics, lowered interfacial resistance, and raised diffusion coefficients for V2+/V3+, VO2+/VO2+, and Mn2+/Mn3+ couples. Full cells achieved peak power densities of 310 and 360 mW cm−2 in all-vanadium and vanadium–manganese systems, with >70% energy efficiency and stable performance over 200 cycles at 100 mA cm−2.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
レドックスフロー電池は再生可能エネルギーの大量導入に伴う長時間蓄電の要となる技術であり、本成果は日本が注力する系統用蓄電池・水素関連の脱炭素技術基盤に資する。ただし開示・政策面の含意は直接的には薄い。
In the global GX context
Redox flow batteries are a key enabler of long-duration storage for grid-scale renewable integration, directly relevant to global decarbonization pathways and the scale-up of variable renewables. The work advances electrode materials engineering rather than disclosure or policy frameworks, so its contribution is to the technology cost-reduction frontier that underpins transition finance narratives.
👥 読者別の含意
🔬研究者:フロー電池電極の界面設計と窒素ドープ炭素材料による反応速度論改善の実証データとして有用。
🏢実務担当者:長時間蓄電システムのコスト・性能改善に関心のある電力・蓄電事業者にとって、電極材料選定の参考になる。
🏛政策担当者:蓄電技術の性能向上は再エネ導入政策の実効性を高めるが、本論文自体は政策提言を含まない。
📄 Abstract（原文）
Abstract Improving interfacial charge-transfer kinetics at porous carbon electrodes remains a central challenge in redox flow battery (RFB) electrochemistry, particularly for kinetically demanding redox couples such as Mn2+/Mn3+. Herein, we report a binder-free horizontal electrophoretic deposition (EPD) strategy to assemble nitrogen-doped carbon nanotubes (N_CNTs) and nitrogen-doped reduced graphene oxide (N_rGO) directly onto woven carbon cloth substrates, enabling controlled nano structuring of electrochemically active interfaces without polymeric binders. Structural and spectroscopic characterizations (SEM, TEM, EDS, XRD, FTIR, Raman and XPS) confirm successful coating of carbon nanomaterials on the cloth and incorporation of nitrogen, introducing defect-rich graphitic domains and enhanced surface functionality. Electrochemical evaluation using cyclic voltammetry and impedance spectroscopy reveals significantly enhanced charge-transfer kinetics, reduced interfacial resistance, and increased diffusion coefficients for V2+/V3+, VO2+/VO2+, and Mn2+/Mn3+ redox couples for N-doped modified electrodes. Particular emphasis is placed on understanding how nanoscale electrode architecture and nitrogen-induced defect chemistry influence the intrinsically sluggish Mn2+/Mn3+ redox reaction, which remains a bottleneck in V/Mn redox flow batteries. When implemented in full redox flow battery cells, N_CNT-modified electrodes deliver reduced polarization losses and peak power densities of 310 and 360 mW cm−2 in all-vanadium and vanadium−manganese systems, respectively. Improved energy efficiency above 70% was achieved in both systems. Stable performance over 200 charge−discharge cycles at 100 mA cm−2 highlights the critical role of nitrogen-induced defect sites in promoting electrochemical reversibility, enhancing interfacial wettability, and modifying the local electron density, thereby effectively overcoming the intrinsic kinetic limitations of the manganese redox chemistry. These results demonstrate that binder-free electrophoretic nano structuring offers a scalable and electrochemically robust route to tailoring carbon electrode interfaces for next-generation flow battery electrodes by providing abundant, electrochemically accessible active sites.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acsaenm.6c00780first seen 2026-09-18 04:45:44
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