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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermoelectricity Enhanced Electrocatalysis

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Author(s):
Sharifi, Tiva [1, 2] ; Zhang, Xiang [1] ; Costin, Gelu [3] ; Yazdi, Sadegh [1] ; Woellner, Cristiano F. [1, 4] ; Liu, Yang [1] ; Tiwary, Chandra Sekhar [1] ; Ajayan, Pulickel [1]
Total Authors: 8
Affiliation:
[1] Rice Univ, Dept Mat Sci & NanoEngn, Houston, TX 77005 - USA
[2] Umea Univ, Dept Phys, SE-90187 Umea - Sweden
[3] Rice Univ, Dept Earth Sci, Houston, TX 77005 - USA
[4] Univ Estadual Campinas, Appl Phys Dept, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Nano Letters; v. 17, n. 12, p. 7908-7913, DEC 2017.
Web of Science Citations: 3
Abstract

We show that thermoelectric materials can function as electrocatalysts and use thermoelectric voltage generated to initiate and boost electrocatalytic reactions. The electrocatalytic activity is promoted by the use of nano-structured thermoelectric materials in a hydrogen evolution reaction (HER) by the thermoelectricity generated from induced temperature gradients. This phenomenon is demonstrated using two-dimensional layered thermoelectric materials Sb2Te3 and Bi0.5Sb1.5Te3 where a current density approaching similar to 50 mA/cm(2) is produced at zero potential for Bi0.5Sb1.5Te3 in the presence of a temperature gradient of 90 degrees C. In addition, the turnover frequency reaches to 2.7 s(-1) at 100 mV under this condition which was zero in the absence of temperature gradient. This result adds a new dimension to the properties of thermoelectric materials which has not been explored before and can be applied in the field of electrocatalysis and energy generation. (AU)

FAPESP's process: 16/12340-9 - Structural and mechanical properties of carbon-based foams
Grantee:Cristiano Francisco Woellner
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 13/08293-7 - CCES - Center for Computational Engineering and Sciences
Grantee:Munir Salomao Skaf
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC