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Title: A Rh xS y/C Catalyst for the Hydrogen Oxidation and Hydrogen Evolution Reactions in HBr

Abstract

Rhodium sulfide (Rh 2S 3) on carbon support was synthesized by refluxing rhodium chloride with ammonium thiosulfate. Thermal treatment of Rh 2S 3 at high temperatures (600°C to 850°C) in presence of argon resulted in the transformation of Rh 2S 3 into Rh 3S 4, Rh 17S 15 and Rh which were characterized by TGA/DTA, XRD, EDX, and deconvolved XPS analyses. The catalyst particle size distribution ranged from 3 to 12 nm. Cyclic voltammetry and rotating disk electrode measurements were used to evaluate the catalytic activity for hydrogen oxidation and evolution reactions in H 2SO 4 and HBr solutions. The thermally treated catalysts show high activity for the hydrogen reactions. The exchange current densities (i o) of the synthesized Rh xS y catalysts in H 2-saturated 1M H 2SO 4 and 1M HBr for HER and HOR were 0.9 mA/cm 2 to 1.0 mA/cm 2 and 0.8 to 0.9 mA/cm 2, respectively. The lower i o values obtained in 1M HBr solution compared to in H 2SO 4 might be due to the adsorption of Br - on the active surface. Stable electrochemical active surface area (ECSA) of Rh xS y catalyst was obtained for CV scan limits between 0more » V and 0.65 V vs. RHE. Scans with upper voltage limit beyond 0.65 V led to decreased and unreproducible ECSA measurements.« less

Authors:
 [1];  [1];  [2];  [2];  [3];  [3];  [4];  [4]
  1. Univ. of Kansas, Lawrence, KS (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Kansas State Univ., Manhattan, KS (United States)
  4. National Taiwan University of Science & Technology, Tapei (Taiwan)
Publication Date:
Research Org.:
TVN Systems, Inc., Lawrence, KS (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1172890
Grant/Contract Number:  
AR0000262
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 162; Journal Issue: 4; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE

Citation Formats

Masud, Jahangir, Nguyena, Trung V., Singh, Nirala, McFarland, Eric, Ikenberry, Myles, Hohn, Keith, Pan, Chun-Jern, and Hwang, Bing-Joe. A RhxSy/C Catalyst for the Hydrogen Oxidation and Hydrogen Evolution Reactions in HBr. United States: N. p., 2015. Web. doi:10.1149/2.0901504jes.
Masud, Jahangir, Nguyena, Trung V., Singh, Nirala, McFarland, Eric, Ikenberry, Myles, Hohn, Keith, Pan, Chun-Jern, & Hwang, Bing-Joe. A RhxSy/C Catalyst for the Hydrogen Oxidation and Hydrogen Evolution Reactions in HBr. United States. doi:10.1149/2.0901504jes.
Masud, Jahangir, Nguyena, Trung V., Singh, Nirala, McFarland, Eric, Ikenberry, Myles, Hohn, Keith, Pan, Chun-Jern, and Hwang, Bing-Joe. Sun . "A RhxSy/C Catalyst for the Hydrogen Oxidation and Hydrogen Evolution Reactions in HBr". United States. doi:10.1149/2.0901504jes. https://www.osti.gov/servlets/purl/1172890.
@article{osti_1172890,
title = {A RhxSy/C Catalyst for the Hydrogen Oxidation and Hydrogen Evolution Reactions in HBr},
author = {Masud, Jahangir and Nguyena, Trung V. and Singh, Nirala and McFarland, Eric and Ikenberry, Myles and Hohn, Keith and Pan, Chun-Jern and Hwang, Bing-Joe},
abstractNote = {Rhodium sulfide (Rh2S3) on carbon support was synthesized by refluxing rhodium chloride with ammonium thiosulfate. Thermal treatment of Rh2S3 at high temperatures (600°C to 850°C) in presence of argon resulted in the transformation of Rh2S3 into Rh3S4, Rh17S15 and Rh which were characterized by TGA/DTA, XRD, EDX, and deconvolved XPS analyses. The catalyst particle size distribution ranged from 3 to 12 nm. Cyclic voltammetry and rotating disk electrode measurements were used to evaluate the catalytic activity for hydrogen oxidation and evolution reactions in H2SO4 and HBr solutions. The thermally treated catalysts show high activity for the hydrogen reactions. The exchange current densities (io) of the synthesized RhxSy catalysts in H2-saturated 1M H2SO4 and 1M HBr for HER and HOR were 0.9 mA/cm2 to 1.0 mA/cm2 and 0.8 to 0.9 mA/cm2, respectively. The lower io values obtained in 1M HBr solution compared to in H2SO4 might be due to the adsorption of Br- on the active surface. Stable electrochemical active surface area (ECSA) of RhxSy catalyst was obtained for CV scan limits between 0 V and 0.65 V vs. RHE. Scans with upper voltage limit beyond 0.65 V led to decreased and unreproducible ECSA measurements.},
doi = {10.1149/2.0901504jes},
journal = {Journal of the Electrochemical Society},
number = 4,
volume = 162,
place = {United States},
year = {2015},
month = {2}
}

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