TY - JOUR
T1 - Towards Watt-scale hydroelectric energy harvesting by Ti3C2TX -based transpiration-driven electrokinetic power generators
AU - Bae, Jaehyeong
AU - Kim, Min Soo
AU - Oh, Taegon
AU - Suh, Bong Lim
AU - Yun, Tae Gwang
AU - Lee, Seungjun
AU - Hur, Kahyun
AU - Gogotsi, Yury
AU - Koo, Chong Min
AU - Kim, Il Doo
N1 - Funding Information:
We acknowledge Prof. Reginald M. Penner at UC Irvine and Dr Jaewan Ahn at KAIST for helpful discussion. This work was supported by the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-MA1802-05 and KAIST Institute for the NanoCentury. This work was further supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2021R1C1C2006535 and 2020M3H4A3106354) and the Korea Institute of Science and Technology (No. 2E30250). Collaboration with Drexel University was supported by the NRF Global Research and Development Center Program (NNFC-Drexel-SMU FIRST Nano Co-op Centre, 2015K1A4A3047100).
Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2022/1
Y1 - 2022/1
N2 - Nano-hydroelectric technology utilizes hydraulic flow through electronically conducting nanomaterials to generate electricity in a simple, renewable, ubiquitous, and environmentally friendly manner. To date, several designs of nano-hydroelectric devices have been devised to maximize the electrokinetic interactions between water molecules and nanomaterials. However, the reported power generation of the state-of-the-art nano-hydroelectric generators is not sufficient for practical use, as tens of thousands of units were required to operate low-power electronics on a mW scale. Here, we utilize titanium carbide (Ti3C2Tx) MXene nanosheets, which have advantageous properties including metal-like conductivity and hydrophilicity, to facilitate the electrokinetic conversion of the transpiration-driven electrokinetic power generator (TEPG) with a remarkably improved energy generation efficiency compared to that of carbon-based TEPG. The Ti3C2Tx MXene-based TEPG delivered a high pseudo-streaming current of 120 μA by the fast capillary flow promoted by MXene sheets coated on cotton fabric. The strong cationic affinity of Ti3C2Tx enables the generator to achieve an output of 0.68 V and 2.73 mA when NaCl solution is applied. Moreover, incorporation of a conducting polymer (i.e., Ti3C2Tx/polyaniline composite) enhanced the ionic diffusivity while maintaining the electrical network of Ti3C2Tx. The optimized Ti3C2Tx/polyaniline composite TEPG generated a maximum voltage of 0.54 V, a current of 8.2 mA, and a specific power density of 30.9 mW cm-3, which was sufficient to successfully charge a commercial Li-ion battery as well as low-power electronics and devices with a volume of 6.72 cm3. This journal is
AB - Nano-hydroelectric technology utilizes hydraulic flow through electronically conducting nanomaterials to generate electricity in a simple, renewable, ubiquitous, and environmentally friendly manner. To date, several designs of nano-hydroelectric devices have been devised to maximize the electrokinetic interactions between water molecules and nanomaterials. However, the reported power generation of the state-of-the-art nano-hydroelectric generators is not sufficient for practical use, as tens of thousands of units were required to operate low-power electronics on a mW scale. Here, we utilize titanium carbide (Ti3C2Tx) MXene nanosheets, which have advantageous properties including metal-like conductivity and hydrophilicity, to facilitate the electrokinetic conversion of the transpiration-driven electrokinetic power generator (TEPG) with a remarkably improved energy generation efficiency compared to that of carbon-based TEPG. The Ti3C2Tx MXene-based TEPG delivered a high pseudo-streaming current of 120 μA by the fast capillary flow promoted by MXene sheets coated on cotton fabric. The strong cationic affinity of Ti3C2Tx enables the generator to achieve an output of 0.68 V and 2.73 mA when NaCl solution is applied. Moreover, incorporation of a conducting polymer (i.e., Ti3C2Tx/polyaniline composite) enhanced the ionic diffusivity while maintaining the electrical network of Ti3C2Tx. The optimized Ti3C2Tx/polyaniline composite TEPG generated a maximum voltage of 0.54 V, a current of 8.2 mA, and a specific power density of 30.9 mW cm-3, which was sufficient to successfully charge a commercial Li-ion battery as well as low-power electronics and devices with a volume of 6.72 cm3. This journal is
UR - http://www.scopus.com/inward/record.url?scp=85123021669&partnerID=8YFLogxK
U2 - 10.1039/d1ee00859e
DO - 10.1039/d1ee00859e
M3 - Article
AN - SCOPUS:85123021669
SN - 1754-5692
VL - 15
SP - 123
EP - 135
JO - Energy and Environmental Science
JF - Energy and Environmental Science
IS - 1
ER -