电合成
硝酸盐
催化作用
氨
生物量(生态学)
氨生产
废水
碳纤维
可再生能源
环境科学
污水处理
制浆造纸工业
材料科学
化学
废物管理
环境化学
环境工程
电化学
有机化学
生态学
工程类
生物
电极
物理化学
复合材料
复合数
作者
He Wang,Shuaishuai Man,Han Wang,Volker Presser,Qun Yan,Yong Zhang
标识
DOI:10.1016/j.apcatb.2023.122778
摘要
Electrochemically converting nitrate, widely distributed in industrial wastewater and contaminated water bodies, into ammonia is a promising route for resource recovery and wastewater treatment. Meanwhile, treating harmful algal blooms (HABs) is presented worldwide, are time and resource-consuming, and carries a high CO2 footprint. Rather than considering this carbon and nitrogen-rich biomass as disposable waste, consider it a vast renewable resource. Therefore, this study presents a Fe-dispersed carbon-based catalyst derived from HABs biomass, with a maximum ammonia yield rate of 16449 μg h−1 cm−2 (1.2 mmol h−1 mgcat−1) and NH3 Faradaic efficiency of 87.3%. This catalyst also possessed decent stability with continuous operation over 50 h. Experimental and theoretical calculation results reveal that the Fe-N4 site facilitates electrocatalytic nitrate reduction reaction by reducing the energy barriers of the NO3--to-NH3 pathway. Thus, this strategy of upcycling HABs biomass waste into functional catalysts offers a multipronged approach to renewable and carbon-neutral energy technologies.
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