In:
Green Chemistry, Royal Society of Chemistry (RSC), Vol. 24, No. 14 ( 2022), p. 5559-5569
Abstract:
Replacing the thermodynamically unfavorable oxygen evolution reaction (OER) with the low theoretical potential (−0.33 V) and safe by-product (N 2 /H 2 O) hydrazine oxidation reaction (HzOR) is an energy-saving way for hydrogen production. Nevertheless, the complexity of bifunctionality increases the difficulty of catalyst design. In this work, a hybrid of NiC 2 O 4 and Nb 2 O 5 is synthesized on nickel foam via a two-step low temperature reaction using Ni 3 S 2 as a sacrificial template, named SNiC 2 O 4 –Nb 2 O 5 /NF. The experimental and theoretical calculation results illustrate that electrons are transferred from Ni to Nb, thus regulating the electronic structure of Ni. In the hybrid, Nb 2 O 5 can effectively adsorb and split H 2 O, as well as downshift the d-band center of SNiC 2 O 4 , thereby optimizing the Volmer step. SNiC 2 O 4 –Nb 2 O 5 /NF achieves the properties for the hydrogen evolution reaction (HER: η 20 = 155 mV) and the oxygen evolution reaction (OER: η 20 = 293 mV). The addition of hydrazine to an alkaline electrolyte can decrease the cell voltage by 1.41 V when the current density is 20 mA cm −2 , and achieve a high-speed hydrogen yield driven by an AA battery. This work puts forward an idea for the rational design of environmentally friendly and effective hybrid catalysts.
Type of Medium:
Online Resource
ISSN:
1463-9262
,
1463-9270
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
1485110-6
detail.hit.zdb_id:
2006274-6
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