Thermogalvanic Hydrogel for Synchronous Evaporative Cooling and Low-Grade Heat Energy Harvesting.

Efficient heat removal and recovery are two conflicting processes that are difficult to achieve simultaneously. Here, in this work, we pave a new way to achieve this through the use of a smart thermogalvanic hydrogel film, in which the ions and water undergo two separate thermodynamic cycles: thermogalvanic reaction and water-to-vapor phase transition. When the hydrogel is attached to a heat source, it can achieve efficient evaporative cooling while simultaneously converting a portion of the waste heat into electricity. Moreover, the hydrogel can absorb water from the surrounding air to regenerate its water content later on. This reversibility can be finely designed. As an applicative demonstration, the hydrogel film with a thickness of 2 mm was attached to a cell phone battery while operating. It successfully decreased the temperature of the battery by 20 °C and retrieved electricity of 5 μW at the discharging rate of 2.2 C.

[1]  Chia-Pin Chiu,et al.  Cooling a Microprocessor Chip , 2006, Proceedings of the IEEE.

[2]  Nannan Zhang,et al.  Micro-cable structured textile for simultaneously harvesting solar and mechanical energy , 2016, Nature Energy.

[3]  Jun Chen,et al.  Smart Textiles for Electricity Generation. , 2020, Chemical reviews.

[4]  Timothy P. Hogan,et al.  Cubic AgPbmSbTe2+m: Bulk Thermoelectric Materials with High Figure of Merit. , 2004 .

[5]  K. Goodson,et al.  Managing heat for electronics , 2005 .

[6]  Shenlong Zhao,et al.  Promoting Energy Efficiency via a Self‐Adaptive Evaporative Cooling Hydrogel , 2020, Advanced materials.

[7]  Daniel Moses,et al.  Multilayer Polymer Light‐Emitting Diodes: White‐Light Emission with High Efficiency , 2005 .

[8]  S. Amdur.  Determination of solute properties by solvent vapor pressure measurements. II. Simple electrolytes, polyelectrolytes, and complex ions , 1975 .

[9]  Phaedon Avouris,et al.  Energy dissipation in graphene field-effect transistors. , 2009, Nano letters.

[10]  Tiejun Zhu,et al.  Realizing high figure of merit in heavy-band p-type half-Heusler thermoelectric materials , 2015, Nature communications.

[11]  Jun Zhou,et al.  Ultra-stretchable, bio-inspired ionic skins that work stably in various harsh environments , 2018 .

[12]  Mohammad Nurul Alam Hawlader,et al.  An active cooling system for photovoltaic modules , 2012 .

[13]  M. Kanatzidis,et al.  Cubic AgPbmSbTe2+m: Bulk Thermoelectric Materials with High Figure of Merit , 2004, Science.

[14]  Peihua Yang,et al.  Aqueous thermogalvanic cells with a high Seebeck coefficient for low-grade heat harvest , 2018, Nature Communications.

[15]  Tianpeng Ding,et al.  Self-Powered Multimodal Temperature and Force Sensor Based-On a Liquid Droplet. , 2016, Angewandte Chemie.

[16]  Taewoo Kim,et al.  High-efficiency electrochemical thermal energy harvester using carbon nanotube aerogel sheet electrodes , 2016, Nature Communications.

[17]  Carter S. Haines,et al.  High Power Density Electrochemical Thermocells for Inexpensively Harvesting Low‐Grade Thermal Energy , 2017, Advanced materials.

[18]  J. Ferraris,et al.  Harvesting waste thermal energy using a carbon-nanotube-based thermo-electrochemical cell. , 2010, Nano letters.

[19]  Douglas R. MacFarlane,et al.  High Seebeck coefficient redox ionic liquid electrolytes for thermal energy harvesting , 2013 .

[20]  Yi Cui,et al.  Materials for lithium-ion battery safety , 2018, Science Advances.

[21]  Yu Zhou,et al.  Harvesting Wasted Heat in a Microprocessor Using Thermoelectric Generators: Modeling, Analysis and Measurement , 2008, 2008 Design, Automation and Test in Europe.

[22]  Jun Zhou,et al.  Wearable Thermocells Based on Gel Electrolytes for the Utilization of Body Heat. , 2016, Angewandte Chemie.

[23]  J. Pátek,et al.  A computationally effective formulation of the thermodynamic properties of LiBr-H2O solutions from 273 to 500 K over full composition range , 2006 .

[24]  Jun Li,et al.  Fast lithium growth and short circuit induced by localized-temperature hotspots in lithium batteries , 2019, Nature Communications.

[25]  S. Kakaç,et al.  Cooling of Electronic Systems , 1994 .

[26]  Yue Hu,et al.  Efficient Perovskite Photovoltaic‐Thermoelectric Hybrid Device , 2018 .

[27]  Ravi Mahajan,et al.  On-chip cooling by superlattice-based thin-film thermoelectrics. , 2009, Nature nanotechnology.

[28]  L. Valdevit,et al.  Active cooling by metallic sandwich structures with periodic cores , 2005 .

[29]  L. Bell.  Cooling, Heating, Generating Power, and Recovering Waste Heat with Thermoelectric Systems , 2008, Science.

[30]  Samuel Graham,et al.  Thermal effects in packaging high power light emitting diode arrays , 2009 .

[31]  Zhigang Suo,et al.  Ionic skin , 2014, Advanced materials.

[32]  T. Kang,et al.  High thermopower of ferri/ferrocyanide redox couple in organic-water solutions , 2017 .