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Selenium vacancy and phosphorus-doping-induced phase transition engineering of cobalt diselenide as bi-functional catalyst for water electrolysis.

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Title: Selenium vacancy and phosphorus-doping-induced phase transition engineering of cobalt diselenide as bi-functional catalyst for water electrolysis.
Authors: Wondimu, Tadele Hunde1 (AUTHOR), Chen, Guan-Cheng1 (AUTHOR), Kabtamu, Daniel Manaye1 (AUTHOR), Chen, Hsueh-Yu1 (AUTHOR), Bayeh, Anteneh Wodaje1 (AUTHOR), Huang, Hsin-Chih1 (AUTHOR) hchuanggood@gmail.com, Wang, Chen-Hao1 (AUTHOR) chwang@mail.ntust.edu.tw
Source: International Journal of Hydrogen Energy. Nov2019, Vol. 44 Issue 54, p28566-28577. 12p.
Subjects: Hydrogen evolution reactions, Water electrolysis, Phase transitions, Oxygen evolution reactions, Platinum catalysts, Cobalt, Selenium
Abstract: This study demonstrates a two-step approach for the synthesis of a cobalt phosphoselenide nanobelt (H–CoSe (2−x) P x NB) that has excellent activity for the hydrogen evolution reaction over a wide pH range (0–14), exhibiting low overpotentials of 112, 261, and 391 mV at a current density of 10 mA cm−2 in 0.5 M H 2 SO 4 , 1 M KOH, and 1 M phosphate-buffered solution, respectively. Conversely, the H–CoSe (2−x) P x NB can be used for the oxygen evolution reaction in basic media, for which its electrochemical performance is superior to that of a platinum catalyst. When a H–CoSe (2−x) P x NB is used on both sides of a single electrolysis cell, almost no degradation occurs at various constant potentials for 12 h period. Its high performance, electrode stability, and easy synthesis suggest that the H–CoSe (2−x) P x NB is an efficient and economic electrocatalyst for water electrolysis. Image 1 • H–CoSe (2−x) P x NB is synthesized by hydrothermal followed by CVD method. • Electrocatalytic activities of H–CoSe (2−x) P x NB for HER and OER are studied. • Synergistic effect of H–CoSe (2−x) P x NB and CoP enhances the performance. • H–CoSe (2−x) P x NB performs low overpotentials in 0.5 M H 2 SO 4 ,1 M KOH, and 1 M PBS. • H–CoSe (2−x) P x NB is stable in 0.5 M H 2 SO 4 at 10–40 mA cm−2 more than 12 h. [ABSTRACT FROM AUTHOR]
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Abstract:This study demonstrates a two-step approach for the synthesis of a cobalt phosphoselenide nanobelt (H–CoSe (2−x) P x NB) that has excellent activity for the hydrogen evolution reaction over a wide pH range (0–14), exhibiting low overpotentials of 112, 261, and 391 mV at a current density of 10 mA cm−2 in 0.5 M H 2 SO 4 , 1 M KOH, and 1 M phosphate-buffered solution, respectively. Conversely, the H–CoSe (2−x) P x NB can be used for the oxygen evolution reaction in basic media, for which its electrochemical performance is superior to that of a platinum catalyst. When a H–CoSe (2−x) P x NB is used on both sides of a single electrolysis cell, almost no degradation occurs at various constant potentials for 12 h period. Its high performance, electrode stability, and easy synthesis suggest that the H–CoSe (2−x) P x NB is an efficient and economic electrocatalyst for water electrolysis. Image 1 • H–CoSe (2−x) P x NB is synthesized by hydrothermal followed by CVD method. • Electrocatalytic activities of H–CoSe (2−x) P x NB for HER and OER are studied. • Synergistic effect of H–CoSe (2−x) P x NB and CoP enhances the performance. • H–CoSe (2−x) P x NB performs low overpotentials in 0.5 M H 2 SO 4 ,1 M KOH, and 1 M PBS. • H–CoSe (2−x) P x NB is stable in 0.5 M H 2 SO 4 at 10–40 mA cm−2 more than 12 h. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2019.09.101