Figure 2 (A) (a-b) HAADF-STEM image (a) and EXAFS fitting curve (b) of Co-N4/C. (c) Relative current ratio of H2O2 to O2 recorded by three catalysts shown in the figure, and (d) in vivo O2 fluctuation recorded by Co-N4/C-based sensor[60]. Reproduced with permission of Ref. 60, copyright 2020 American Chemical Society. (B) (a-b) Schematic illustration of fabrication process (a) and stretching process (b) of Ni SAC/N-C-based sensor. (c) Real-time monitoring of NO release[61]. Reproduced with permission of Ref. 61, copyright 2020 Springer Nature. (C) (a) Schematic illustration of online electrochemical system (OECS) with a SAC-based electrochemical sensor for continuous glucose monitoring, and (b) typical amperometric response of OECS toward microdialysate in vivo sampled from rat brain[62]. Reproduced with permission of Ref. 62, copyright 2019 Springer. (color on line)
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