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Destination: mk:title Children: Item: Title: 1 Introduction Destination: mk:H1_1 Item: Title: 2 Results and Discussion Destination: mk:H1_2 Children: Item: Title: 2.1 Green wet-chemical activation method Destination: mk:H2_1 Item: Title: 2.2 Characterization of NaBH4-activated 3D-CuEs Destination: mk:H2_2 Item: Title: 2.3 Electroanalytical performance of NaBH4-activated 3D-CuEs towards NO3  Destination: mk:H2_3 Item: Title: 3 Conclusions Destination: mk:H1_3 Item: Title: CRediT authorship contribution statement Destination: mk:H1_4 Item: Title: Associated Content Destination: mk:H1_5 Item: Title: Declaration of Competing Interest Destination: mk:HH1_2 Item: Title: Acknowledgment Destination: mk:HH1_3 Item: Title: Appendix A Supporting information Destination: mk:H1_6 Item: Title: Data availability Destination: datalink4 Item: Title: References Destination: mk:HH2_1 Info: Title: Sustainable wet-chemical sintering of metal-based 3D-printed electrodes enables high-performance 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