The progress of high-efficiency non-precious metal anode catalysts for direct seawater splitting is of great importance. However, due to the slow oxygen evolution reaction (OER) kinetics, competition of chlorine evolution reaction (ClER), and corrosion of chloride ions on the anode, the direct seawater splitting faces many challenges. Herein, we develop a perovskite@NiFe layered double hydroxide composite for anode catalyst based on Ba0.5Sr0.5Co0.8Fe0.2O3 (BSCF) and NiFe layered double hydroxide (NiFe-LDH) heterostructure. The optimized BSCF@CeO2@NiFe exhibits excellent OER activity, with the potential at 100 mA cm−2 (Ej = 100) being 1.62 V in the alkaline natural seawater. Moreover, the electrolytic cell composed of BSCF@CeO2@NiFe anode shows an excellent stability, with negligible attenuation during the long-term overall seawater splitting with the remarkable self-recovery ability in the initial operation stage, and the direct seawater splitting potential increasing by about 30 mV at 10 mA cm−2. Our work can give a guidance for the design and preparation of anode catalysts for the direct seawater splitting.
Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) perovskite has been
recognized
as a promising oxygen evolution reaction (OER) catalyst due to its
superior intrinsic catalytic activity. However, BSCF suffers from
serious degradation during the OER process due to its surface amorphization
caused by the segregation of A-site ions (Ba2+ and Sr2+). Herein, we construct a novel BSCF composite catalyst (BSCF–GDC–NR)
by anchoring the gadolinium-doped ceria oxide (GDC) nanoparticles
on the surface of a BSCF nanorod by a concentration-difference electrospinning
method. Our BSCF–GDC–NR has greatly improved bifunctional
oxygen catalytic activity and stability toward both oxygen reduction
reaction (ORR) and OER compared with the pristine BSCF. The improvement
of the stability can be related to that anchoring GDC on BSCF effectively
suppresses the segregation and dissolution of A-site elements in BSCF
during the preparation and catalytic processes. The suppression effects
are ascribed to the introduction of compressive stress between BSCF
and GDC, which greatly inhibits the diffusions of Ba and Sr ions.
This work can give a guidance for developing the perovskite oxygen
catalysts with high activity and stability.
As a potential oxygen evolution reaction (OER) catalyst, Co-based perovskites have received intensive attentions. However, Sr is readily to accumulate on their surface, then makes them inert toward OER. Herein,...
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