石墨毡负载NiOOH的高选择性H_(2)O_(2)生成及其在电芬顿中的应用

Highly Selective H_(2)O_(2) Electrogeneration with NiOOH-supported Graphite Felt and Its Application in Electro-Fenton

【目的】电化学合成过氧化氢(H_(2)O_(2))原位耦合芬顿技术在黑臭水体治理中具有广阔的应用前景,对中性介质中低成本、高性能氧还原阴极电催化剂进行研究很有必要。【方法】通过简单、有效的水热法制备了石墨毡负载NiOOH电催化剂(x-NiOOH/GF),探讨了水热过程中硝酸镍添加量对催化剂形貌和电化学性能的影响。【结果】实验结果表明:3.5-NiOOH/GF具有高暴露的活性位点和接触面。中性条件下,在氧还原反应(ORR)中表现出高的电化学活性、近100%的H_(2)O_(2)选择性和优异的稳定性,最后,3.5-NiOOH/GF通过电芬顿工艺有效降解罗丹明B(RhB),表明其处理难降解有机污染废水的潜力。

【Purposes】Electrochemical synthesis of hydrogen peroxide(H_(2)O_(2))in situ coupled Fenton-like technology has broad application prospects in the treatment of black-odorous waterbodies.However,the development of low-cost,high-performance oxygen reduction cathode electrocatalysts in neutral media has become a key obstacle to the commercial implementation of this technology.【Methods】To address this problem,a graphite felt(GF)-supported NiOOH electrocatalyst(x-NiOOH/GF)was prepared by a simple and effective hydrothermal method,and the effects of nickel nitrate addition on the morphology and electrochemical performance of the catalysts during the hydrothermal process were discussed.【Findings】The experimental results show that:The surface of 3.5-NiOOH/GF carbon fiber is covered with a layer of ordered sheet-like structure.Under neutral conditions,it exhibits high electrochemical activity,nearly 100%H_(2)O_(2) selectivity,and excellent stability in oxygen reduction reaction(ORR).Finally,3.5-NiOOH/GF effectively degrades rhodamine B by electro-Fenton process,indicating its potential to treat black-odorous waterbodies.