Ma Wencan,Lin Yan,Huang Caoxing,Amin Mohammed A.,El-Bahy Salah M.,Melhi Saad,Ragauskas Arthur J.,Fang Guigan,Huang Chen
The smart home, constructed with plenty of electronic devices, has received great attention in human life. In this system, triboelectric nanogenerator (TENG) plays an important role due to its simple preparation, high output voltage, and high energy conversion efficiency. However, the extensive usage of nondegradable polymers as the friction layer inevitably causes environmental issue, and also the conventional conductive electrode using metal may result in the accommodation of metal. Herein, a fully wood-based single electrode triboelectric nanogenerator (FW-TENG) is proposed for the first time, in which a porous structure is generated with the delignification process and the wood-based friction layer exhibited good flexibility. In addition, the FW-TENG with wood-derived carbon as the electrode delivered high output voltage, current density, and power density of 208 V (580 kV m −2 ), 167 mA m −2 , and 4.86 W m −2 , outperforming other TENGs. Furthermore, the triboelectric nanogenerator could generate different electrical signals via contacting different objects and harvest energy from various human motions. Simultaneously, the application of the FW-TENG for smart home is also demonstrated. This study may provide a green and facile strategy for fabricating the eco-friendly triboelectric nanogenerator with excellent output electrical performance and degradability.
Kun Zhang,Xin Li,Chenyang Yan,Rongxiang Shi,Zhiqiang Fang,Songlin Zhou,Rong Cao,Junfei Tian
Water-induced electricity harvesting has gained much significance for energy sustainability. Bio-based hydrovoltaic materials increase the attractiveness of this strategy. Although promising, it faces a challenge due to its reliance on fresh water and its inherently low power output. Herein, the energy from alkalinity-gradient power generation demonstrated the feasibility of reuse of alkaline wastewater to develop an all-wood-based water-induced electric generator (WEG) based on ion concentration gradients. The intermittent water droplets bring about uneven distribution of electrolyte and endow delignified wood with the difference of ion concentration along aligned cellulose nanochannels, thus supplying electrical power. The practice of using alkali reservoirs, including industrial wastewater, further contributes to electricity generation. The cubic WEG with a side length of 2 cm can produce an ultrahigh open-circuit voltage of about 1.1 V and a short-circuit current of up to 320 μA. A power output of 6.75 μW cm–2 is correspondingly realized. Series-connected WEGs can be used as an energy source for commercial electronics and self-powered systems. Our design provides a double value proposition, allowing for sustainable energy generation and wastewater reuse.
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