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Integrated near-field thermo-photovoltaics for heat recycling.

ABSTRACT: Energy transferred via thermal radiation between two surfaces separated by nanometer distances can be much larger than the blackbody limit. However, realizing a scalable platform that utilizes this near-field energy exchange mechanism to generate electricity remains a challenge. Here, we present a fully integrated, reconfigurable and scalable platform operating in the near-field regime that performs controlled heat extraction and energy recycling. Our platform relies on an integrated nano-electromechanical system that enables precise positioning of a thermal emitter within nanometer distances from a room-temperature germanium photodetector to form a thermo-photovoltaic cell. We demonstrate over an order of magnitude enhancement of power generation (P_gen?~?1.25 ?Wcm^-2) in our thermo-photovoltaic cell by actively tuning the gap between a hot-emitter (T_E?~?880?K) and the cold photodetector (T_D?~?300?K) from ~?500 nm down to ~?100?nm. Our nano-electromechanical system consumes negligible tuning power (P_gen/P_NEMS ~?10⁴) and relies on scalable silicon-based process technologies.

SUBMITTER: Bhatt GR

PROVIDER: S-EPMC7242323 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Integrated near-field thermo-photovoltaics for heat recycling.

Bhatt Gaurang R GR Zhao Bo B Roberts Samantha S Datta Ipshita I Mohanty Aseema A Lin Tong T Hartmann Jean-Michel JM St-Gelais Raphael R Fan Shanhui S Lipson Michal M

Nature communications 20200521 1

Energy transferred via thermal radiation between two surfaces separated by nanometer distances can be much larger than the blackbody limit. However, realizing a scalable platform that utilizes this near-field energy exchange mechanism to generate electricity remains a challenge. Here, we present a fully integrated, reconfigurable and scalable platform operating in the near-field regime that performs controlled heat extraction and energy recycling. Our platform relies on an integrated nano-electr ...[more]

PMID: 32439917

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Project description:Effects of heat priming applied to the first generation on tolerance of the successive generation to post-anthesis high temperature stress were investigated. Compared with the progeny of non-heat primed plants (NH), the progeny of heat-primed plants (PH) presented higher grain yield, leaf photosynthesis and activities of antioxidant enzymes and lower cell membrane damage under high temperature stress. In the transcriptome profile, 1430 probes showed obvious difference in expression between PH and NH. These genes were those of signal transduction, transcription, energy, defense, and protein destination and storage, respectively. Pot experiments (25 cm in diameter and 22 cm in depth) were conducted at the Experimental Station of Nanjing Agricultural University, Nanjing, China (32Ë30Ê¹N and 118Ë42Ê¹E). During the first generation, wheat plants were divided into two groups: one group were not primed (N) while the other were heat-primed (P) at pre-anthesis (at a day/night temperature of 32/28ËC for two days at the seven-leaf stage and the nine-leaf stage) and post-anthesis (34/30ËC for seven days at the 10th day after anthesis). At maturity, seeds from both groups were harvested. Seedlings (the progeny generation) from each group seed were further divided two sub-groups: one was subjected to high temperature stress at a day/night temperature of 34/30ËC, while the other was set at 26/22ËC for six days from the 10th day after anthesis (DAA). During both priming and high-temperature stress, plants under different treatments were moved into sepatarate growth chambers at preset temperatures. Thereafter, four treatments were established: NC, progeny of non-primed plants without post-anthesis high temperature stress; NH, progeny of non-primed plants with post-anthesis high temperature stress; PC, progeny of primed plants without post-anthesis high temperature stress; and PH, progeny of primed plants with post-anthesis high temperature stress.

Dataset Information

Integrated near-field thermo-photovoltaics for heat recycling.

Publications

Integrated near-field thermo-photovoltaics for heat recycling.

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