Nano Energy

With the rapid development of the electronic industry, undesired electromagnetic (EM) wave radiations and energy shortage crisis pose a great threat to human health, electric devices, and environmental security. Herein, we reported the fabrication of a MXene Ti 3 C 2 T x /carboxymethyl cellulose (MXene/CMC) aerogel as an energy harvester, which can be used for not only harvesting external mechanical energy but also protecting human health from EM wave radiations. An ideal electromagnetic interference (EMI) shielding efficiency of 52.15, 60.31, and 80.36 dB could be achieved in X, Ku, and K bands, respectively. Furthermore, the harvest mechanical energy property of MXene/CMC aerogel-based triboelectric nanogenerator (TENG) was also studied, the peak-to-peak open circuit voltage and short circuit current reached 54.37 V and 1.22 μA, respectively. With the optimal external resistance of 18 MΩ, the power density of the MXene/CMC aerogel-based TENG exhibited 402.94 mW m −2 . It could easily illuminate the commercial light-emitting diode with a bare finger continuously contacting/separating mode. In addition, the MXene/CMC aerogel-based TENG was utilized to monitor human health by attaching MXene/CMC aerogel-based TENG on the differernt huamna dody parts as the self-powered sensor. Therefore, the developed MXene/CMC aerogel in this work presents bright potentials in the fields of harvesting energy, which can detect and protect human health from EM radiation. • MXene/carboxymethyl cellulose (CMC) aerogel is fabricated by freeze-drying process. • MXene/CMC aerogel exhibited electromagnetic shielding of 80.36 dB at K-band. • MXene/CMC aerogel exhibited mechanical harvesting and self-powered sensing. • The open-circuit voltage of 54.73 V is obtained by hand slapping. • The output power density of 402.94 mW m −2 is realized with a loading of 18 MΩ.

Lightweight and flexible MXene/carboxymethyl cellulose aerogel for electromagnetic shielding, energy harvest and self-powered sensing