Journal
CATALYSTS
Volume 13, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/catal13030636
Keywords
cobalt vanadate (CoV); OER; water splitting; seawater; connate water; Pluronic-123 (P-123)
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Exploring different catalytic material paradigms is important for finding the best OER catalyst to produce hydrogen fuel from water. Cobalt-based materials, specifically the mu-CoV MPs synthesized in this study, show promising performance in seawater electrolytes. The annealing process significantly improves the crystallinity of the mu-CoV MPs, leading to enhanced OER behavior. However, the mu-CoV MPs electrode is not stable in connate water electrolytes.
Exploring different catalytic material paradigms could drive the search for the best oxygen evolution reaction (OER) catalyst to achieve industrially-feasible hydrogen fuel from water. Cobalt-based materials are considered good choices in this regard. Herein, we synthesized Pluronic-123 (P-123)-stabilized, unique, rough, globular-shaped cobalt vanadate microparticles (mu-CoV MPs) using an ultrasonic-assisted solvothermal method. The as-synthesized mu-CoV MPs were subjected to high-temperature annealing to improve the crystallinity and the surface polymer moieties were pyrolyzed. Conventional SEM, XRD, FTIR, and BET analyses evaluated the morphological and structural features. The temperature-controlled crystalline phase led to extensive OER performance in SW electrolytes. The OER onset potential (V-OER) was observed at 1.557 V@10 mA/cm(2) in seawater (SW) for mu-CoV MPs annealed at 400 degrees C compared to the V-OER of 1.632 V of non-annealed mu-CoV MPs. The current density showed a steep increase beyond 1.557 V, confirming the excellent electrokinetics OER behavior of the mu-CoV MPs-deposited electrode. The chronoamperometric (I-t) OER stability comparison in SW and connate water (CW) electrolytes indicated only a <20% initial current density decrease after 8 h in the case of the SW electrolyte. However, the CW electrolyte posed serious challenges to the electrode and activity was completely lost after <2 h. The electrolytic comparison indicated that SW is highly suitable for mu-CoV MPs electrodes.
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