▎ 摘　　要

This work reports a three-dimensional N, S co-doped lignin-based carbon microsphere/graphene composite hydrogel (GH-NSCMS) as an electrode material for supercapacitors and a signal enhancement material for tetracycline molecularly imprinted electrochemical sensors (MIECS). As a supercapacitor electrode, GH-NSCMS electrode has a specific capacitance of 434.6 F g(-1) at 0.5 A g(-1), which can still maintain 94.15% after 5,000 cycles. In addition, a highly sensitive MIP electrochemical sensor for tetracycline detection is prepared based on GH-NSCMS composite material due to the synergistic effects of the high recognition accuracy of the imprinting method, and excellent conductivity of the composite hydrogel material. The sensor has a wide linear range (0.1-50 mu M) and a significant detection limit (5 x 10(-8) mol L-1). Therefore, the 3D GH-NSCMS composites described herein have potential application prospects in supercapacitor electrode materials and tetracycline molecular imprinting detection. (C) 2022 The Society of Powder Technology Japan. Published by Elsevier BV and The Society of Powder Technology Japan. All rights reserved.