Journal
ACS NANO
Volume 16, Issue 3, Pages 4861-4875Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c00466
Keywords
graphene-carbon nanotubes; tin phosphide; hydrogen evolution reaction; oxygen evolution reaction; overall water splitting; solar-driven water-splitting; electrocatalyst
Categories
Funding
- Department of Science and Technology, Government of India [SR-/NM/NS-91/2016, DST/INT/JSPS/P-311/2020]
- [SERB-EEQ/2016/000499]
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Water splitting using renewable energy resources is an economic and green approach for producing high-purity hydrogen fuel. This study reports a superhydrophilic layered leaflike Sn4P3 on a graphene-carbon nanotube matrix as an efficient and stable electrocatalyst for water splitting. The catalyst exhibits outstanding electrochemical performance, stability, and solar-to-hydrogen conversion efficiency.
Water splitting using renewable energy resources is an economic and green approach that is immensely enviable for the production of high-purity hydrogen fuel to resolve the currently alarming energy and environmental crisis. One of the effective routes to produce green fuel with the help of an integrated solar system is to develop a cost-effective, robust, and bifunctional electrocatalyst by complete water splitting. Herein, we report a superhydrophilic layered leaflike Sn4P3 on a graphene-carbon nanotube matrix which shows outstanding electrochemical performance in terms of low overpotential (hydrogen evolution reaction (HER), 62 mV@10 mA/cm(2), and oxygen evolution reaction (OER), 169 mV@20 mA/cm(2)). The outstanding stability of HER at least for 15 days at a high applied current density of 400 mA/cm(2) with a minimum loss of potential (1%) in acid medium infers its potential compatibility toward the industrial sector. Theoretical calculations indicate that the decoration of Sn4P3 on carbon nanotubes modulates the electronic structure by creating a higher density of state near Fermi energy. The catalyst also reveals an admirable overall water splitting performance by generating a low cell voltage of 1.482 Vp10 mA/cm(2) with a stability of at least 65 h without obvious degradation of potential in 1 M KOH. It exhibited unassisted solar energy-driven water splitting when coupled with a silicon solar cell by extracting a high stable photocurrent density of 8.89 mA/cm(2) at least for 90 h with 100% retention that demonstrates a high solar-to-hydrogen conversion efficiency of similar to 10.82%. The catalyst unveils a footprint for pure renewable fuel production toward carbon-free future green energy innovation.
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