Humidity‐Resistive Triboelectric Nanogenerator Fabricated Using Metal Organic Framework Composite

Abstract

(1 of 9)triboelectric nanogenerator (TENG), based on the coupling of triboelectrification and electrostatic induction, [5][6][7][8][9][10] has been proved as a cost-effective, simple, and efficient technique, which can directly convert mechanical energy such as wind flows, ocean waves and human motions into electric energy. [11][12][13][14][15][16][17][18][19][20] Recently, various strategies have been reported to improve the performance of TENG, such as selection of suitable triboelectric materials, [21] charge injection, [22] control of morphology, [23] and structural optimization. [24] Of all the above mentioned methods, the selection of the material is the most effective way to fundamentally improve the performance of the TENG via the increase of the surface charge density, but it is usually confined to some conventional materials from triboelectric series. Hu's group had demonstrated that the output performance has a close relationship with the dielectric constant of the tribomaterial. [25] In addition, for the TENG-based energy harvesting and self-powered applications in open environment, environmental factors, such as humidity, have a great influence on the performance of TENG. [20,26] The output performance of TENG would be drastically degraded by humidity due to formation of a water layer on the surface of the triboelectric materials which deplete the induced charges. Thus, it is still a challenge to design a novel TENG material with excellent performance under varying environments, such as high humidity.Metal organic frameworks (MOFs) are an intriguing class of crystalline materials that comprises inorganic metal ions (components of nodes) and organic ligands (structural linkers) via coordination chemistry. [27,28] Owing to large internal surface areas and extended nanoscale porosity, MOFs have been widely studied as candidate materials for applications in chemical separations, [29] gas storage, [30] catalysis, [31] sensing, [32] and drug delivery. [33] HKUST-1 (Cu 3 (BTC) 2 , (BTC = 1,3,5-benzenetricarboxylate or trimesate)) is a very well-studied and stable MOF, which consists of Cu ions and benzene tricarboxylate (BTC) as a linker. Recently, experimental results have shown that the dielectric property of HKUST-1 film is highly dependent on the relative humidity (RH). [34] Till now, no experimental reports on the triboelectric property based on MOF matericals have been reported yet.In this paper, we designed a novel humidity-resistive TENG based on nanocomposite film made of HKUST-1 and polydimethylsiloxane (PDMS). HKUST-1 has poor conductivity due to the insulating nature of organic ligands along with d-orbital participation of metal ions in coordination bonds With its light weight, low cost, and high efficiency, the triboelectric nanogenerator (TENG) is considered a sustainable and renewable energy source for selfpowered or mobile electronics. However, the performance of TENG is seriously affected by humid environment. Here, for the first time, TENG with improved performance under high humidity is o...

Impact-Driven Energy Harvesting: Piezoelectric Versus Triboelectric Energy Harvesters

“…Four basic energy harvesting modes of TEHs are vertical contact-separation (CS) mode, lateral-sliding (LS) mode, single-electrode (SE) mode, and freestanding triboelectric-layer (FT) mode [ 21 ]. Examples of studies on characterization and optimization of the electrical performance of triboelectric and electrode materials, device fabrication, and environment condition control are the following studies [ 22 , 23 , 24 , 25 , 26 , 27 ]. In addition, Cun Xin Lu et al [ 28 ] investigated the temperature effect on the triboelectric electrical output of a single-electrode mode and reported that, at a low temperature, the TEH was able to generate high electrical output, and vice versa.…”

Design of a self-powered triboelectric face mask

“…Several combinations of triboelectric materials and EL used for making the face mask have been explored, particularly only PU, combination of PP-PU pair and EL are tested here. Since different triboelectric materials are sensitive to moisture that may reduce the overall efficiency of TENG [ [66] , [67] , [68] , [69] , [70] ], taking into consideration, a capacitor (C s in Fig. 2 b) is introduced in self-powered TENG mask that enable to active the EL whenever it is required.…”

Material aspects of triboelectric energy generation and sensors

“…3d). Incorporating nanocrystals, such as metal organic frameworks (MOFs) 72 and titania monolayers (Ti 0.87 O 2 ) 73 , into the charge-generating layers enhanced the TENG output power due to the synergetic effects between efficient electron capture and the increase in the dielectric constant of the nanocrystals.…”