Removal of NO₃⁻ is a challenging problem in wastewater treatment. Electrocatalysis shows a great potential to remove NO₃⁻ but selectively converting NO₃⁻ to N₂ is facing a low efficiency. Here, a novel 3D Pd-Cu(OH)₂/CF cathode based electrocatalytic (EC) system was proposed that can rapidly and selectively convert NO₃⁻ to NH₄⁺, and further convert to N₂ simultaneously. The special designs for the system include: Cu(OH)₂ nanowires were firstly grown on copper foam (CF) with excellent conductivity that features high specific surface area in enhancing NO₃⁻ absorption and conversion to NO₂⁻. Then, palladium (Pd) with a superior photons activation capacity was doped on the Cu(OH)₂ nanowires to promote the reduction of NO₂⁻ to NH₄⁺. Then NH₄⁺ was quickly oxidized into N₂ by active chlorine. Finally, total nitrogen (TN) could easily be removed completely via above exhaustive cycle reactions. The 3D Pd-Cu(OH)₂/CF cathode exhibits a 98.8 % conversion of NO₃⁻ to NH₄⁺ in 45 min with the reported highest removal rate of 0.017 cm^-2 min^-1, which is 19.4 times higher than that of CF. The converted NH₄⁺ was finally exhaustively oxidized to N₂ with a 98.7 % of TN removal in 60 min.

NO的除去₃ ^-是在废水处理中一个具有挑战性的问题。电催化显示了很大的潜力，以除去NO ₃ ^-但选择性地转换NO ₃ ^-至N ₂面临低效率。在此，一种新型的三维的Pd-Cu系（OH）₂ / CF阴极基于电（EC）系统，提出了能够快速且选择性地转化NO ₃ ^-以NH ₄ ⁺，并且进一步转换成N ₂同时进行。该系统的特殊设计包括：Cu（OH）₂纳米线首先用导电性优异，具有高的比表面积在提高NO生长在铜泡沫（CF）₃ ^-吸收并转化成NO ₂ ^- 。然后，钯（Pd）以优异的光子激活容量掺杂在Cu（OH）_2层的纳米线，以促进NO的还原₂ ^-至NH ₄ ⁺。然后，NH ₄ ⁺被活性氯迅速氧化成N ₂。最后，通过上述详尽的循环反应，很容易将总氮（TN）完全去除。所述3D钯-铜（OH）₂ / CF阴极表现出NO的98.8％的转化率₃ ^-在45分钟内去除NH ₄ ⁺，据报道去除率最高为0.017 cm ^-2  min ^-1，是CF的19.4倍。最终，在60分钟内将98.7％的TN去除，将已转化的NH ₄ ⁺彻底氧化为N ₂。