TY - JOUR
T1 - Respective influence of stoichiometry and NiOOH formation in hydrogen and oxygen evolution reactions of nickel selenides
AU - Anantharaj, Sengeni
AU - Subhashini, Elangovan
AU - Swaathini, Karukkampalyam C.
AU - Amarnath, Thangavel S.
AU - Chatterjee, Shubham
AU - Karthick, Kannimuthu
AU - Kundu, Subrata
N1 - Funding Information:
Authors thank Dr. Vijayamohanan K Pillai, Former Director, CSIR – CECRI for the constant support. S.A and K.K acknowledge CSIR and UGC, New Delhi respectively for the SRF award. S. Kundu wishes to acknowledge Department of Science and Technology (DST) for EMR research funding of number # EMR/2017/000860 on 11th May 2018 with institute OM number 18-29-03/(27/2018)–TTBD-CSIR-CECRI on 29/10/2018.
Funding Information:
Authors thank Dr. Vijayamohanan K Pillai, Former Director, CSIR – CECRI for the constant support. S.A and K.K acknowledge CSIR and UGC, New Delhi respectively for the SRF award. S. Kundu wishes to acknowledge Department of Science and Technology (DST) for EMR research funding of number # EMR/2017/000860 on 11th May 2018 with institute OM number 18-29-03/(27/2018)–TTBD-CSIR-CECRI on 29/10/2018.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Understanding the inherent activity of an electrocatalyst is an effective way of studying its optimization conditions for harvesting better performance. In this, we studied the inherent electrocatalytic activity of nickel selenide catalysts of three different stoichiometry such as Ni0.85Se, Ni3Se4 and NiSe2 in which the Se:Ni ration varies as 1.176, 1.333 and 2.0 respectively. The hydrogen evolution reaction (HER) of these catalysts was found to increase with the increasing Se:Ni ratio due to which NiSe2 turned out to be the better one among others. Interestingly, the oxygen evolution reaction (OER) of these catalysts showed a different trend irrespective of Se:Ni ratio where the ease of formation of NiOOH was found to control the kinetic current. Such influences of stoichiometry in HER and ease of NiOOH formation in OER had never been revealed before for nickel selenide system.
AB - Understanding the inherent activity of an electrocatalyst is an effective way of studying its optimization conditions for harvesting better performance. In this, we studied the inherent electrocatalytic activity of nickel selenide catalysts of three different stoichiometry such as Ni0.85Se, Ni3Se4 and NiSe2 in which the Se:Ni ration varies as 1.176, 1.333 and 2.0 respectively. The hydrogen evolution reaction (HER) of these catalysts was found to increase with the increasing Se:Ni ratio due to which NiSe2 turned out to be the better one among others. Interestingly, the oxygen evolution reaction (OER) of these catalysts showed a different trend irrespective of Se:Ni ratio where the ease of formation of NiOOH was found to control the kinetic current. Such influences of stoichiometry in HER and ease of NiOOH formation in OER had never been revealed before for nickel selenide system.
KW - Electrocatalysis
KW - Hydrogen evolution
KW - Nickel selenide
KW - Oxygen evolution
KW - Stoichiometry dependence
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U2 - 10.1016/j.apsusc.2019.05.118
DO - 10.1016/j.apsusc.2019.05.118
M3 - Article
AN - SCOPUS:85066440996
SN - 0169-4332
VL - 487
SP - 1152
EP - 1158
JO - Applied Surface Science
JF - Applied Surface Science
ER -