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Synthesis and characterization of battery waste-derived graphene oxide toward green energy applications

グリーンエネルギー応用に向けたバッテリー廃棄物由来グラフェンオキシドの合成と特性評価 (AI 翻訳)

Quynh NTN, Quyen NT, Khanh PTT, Quynh NP, Le TT, Nguyen PT, Wei K, Dang V

Research Squareプレプリント2026-08-13#エネルギー転換対象セクター: waste_management
DOI: 10.3897/arphapreprints.e211623
原典: https://doi.org/10.3897/arphapreprints.e211623

🤖 gxceed AI 要約

日本語

使用済み乾電池から回収した黒鉛棒をプラズマ支援電気化学的剥離によりグラフェンオキシド（GO）に変換し、水素発生反応（HER）触媒としての性能を評価した。最適条件のGO-65は350 mVの過電圧で10 mA cm⁻²を達成し、24時間後も95%の電流保持率を示した。バッチ当たり約5 gのGOを生成し、消費電力は0.113 kWhで、廃棄物のアップサイクリングによるグリーン水素製造への可能性を示した。

English

Graphene oxide (GO) nanosheets were synthesized from graphite rods recovered from spent AA batteries via plasma-assisted electrochemical exfoliation. The optimized GO-65 exhibited an overpotential of 350 mV at 10 mA cm⁻² and retained 95% current after 24 h. The process yields ~5 g per batch with low energy consumption (0.113 kWh), demonstrating potential for upcycling carbon-rich waste into functional materials for green hydrogen production and circular economy.

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

日本では、廃棄物由来材料の活用は循環経済政策やGX実現に寄与する。本研究成果は、バッテリー廃棄物の高付加価値化を通じて、資源循環と水素社会の両立に貢献する可能性があり、廃棄物処理業者や材料メーカーにとって参考になる。

In the global GX context

This study aligns with global efforts to integrate circular economy principles into clean energy technologies. By converting battery waste into a valuable electrocatalyst for green hydrogen, it addresses both waste management and renewable energy production, relevant to international sustainability goals and circular economy policies.

👥 読者別の含意

🔬研究者:Provides a low-cost, scalable method for producing GO from waste, offering a sustainable alternative for electrocatalyst scaffolds.

🏢実務担当者:Highlights a potential waste-to-value pathway for battery recycling industries, though further scale-up and cost analysis are needed.

🏛政策担当者:Supports policies promoting circular economy and waste valorization for green energy applications.

📄 Abstract（原文）

Graphene oxide (GO) nanosheets were produced from graphite rods recovered from spent AA batteries through surface plasma-assisted electrochemical exfoliation in 3.0 M KOH, followed by ultrasonic dispersion. Applied biases of 55–70 V were investigated, with GO-65 showing the best overall performance. Physicochemical characterization confirmed the formation of oxygen-functionalized, defect-rich, multilayered nanosheets containing retained or restacked graphitic domains. In 1 M KOH, GO-65 required an overpotential of 350 mV to reach 10 mA cm⁻ 2 and exhibited a Tafel slope of 52 mV dec⁻ 1 . Its higher double-layer capacitance and lower interfacial impedance indicated a larger electrochemically accessible interface and more favorable charge transfer. GO-65 retained approximately 95% of its initial current after 24 h, while its overpotential increased by only 10 mV. The rapid and simple process produced approximately 5 g of dry GO per batch, while the plasma and ultrasonication steps consumed a combined 0.113 kWh, highlighting its potential for higher-throughput production. Although GO alone showed moderate HER activity, its accessible surface, oxygen-containing anchoring groups, and stable graphitic framework make it a promising scaffold for composite electrocatalysts. This approach provides a practical basis for upcycling carbon-rich waste into functional materials for green hydrogen production and circular resource use.

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