Background

Electrocatalytic synthesis of H₂O₂ by oxygen reduction is regarded as the most promising alternative to AO process, and thus, design of a cost-effective and highly active cathode of vital significance.

Methods

This work modified graphite felts via anodic oxidation process in NH₄HCO₃ aqueous, and demonstrated the electrogeneration of H₂O₂ by using modified graphite felt cathode. The surface properties of different modified graphite felt were investigated. Various conditions of the process, including potential, reaction pH, and O₂ flux, were optimized.

Significant findings

Through the modification, the beneficial functional groups COO and C=O has considerable increased, which lead the kinetics of ORR enhanced and H₂O₂ electrochemical production increased. The maximum accumulation rate of H₂O₂ achieved 2.00 mg/h/cm² at the conditions of -0.60 V (vs.SCE), 0.4 L/min oxygen flow rate and pH 3. The modified cathode kept a stable performance for H₂O₂ electrochemical synthesis during 5 cycles.

中文翻译：

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使用阳极氧化石墨毡通过氧还原来发电过氧化氢

背景

通过氧还原电催化合成 H ₂ O ₂被认为是最有前途的 AO 工艺替代方法，因此，设计一种具有成本效益和高活性的阴极具有重要意义。

方法

本工作在NH ₄ HCO ₃水溶液中通过阳极氧化工艺对石墨毡进行了改性，并证明了使用改性石墨毡阴极进行H ₂ O ₂的电发电。研究了不同改性石墨毡的表面性能。优化了该过程的各种条件，包括电位、反应 pH 值和 O ₂通量。

重要发现

通过改性，有益官能团COO和C=O显着增加，导致ORR动力学增强，H ₂ O ₂电化学产量增加。在-0.60 V (vs.SCE)、0.4 L/min 氧气流速和 pH 3 条件下，H ₂ O ₂的最大积累速率达到 2.00 mg/h/cm ^2。改性阴极对 H 保持稳定的性能₂ O ₂电化学合成5次循环。