Morphology Modulation and Phase Transformation of Manganese–Cobalt Carbonate Hydroxide Caused by Fluoride Doping and Its Effect on Boosting the Overall Water Electrolysis

Abstract

Increasing demands for pollution-free energy resources have stimulated intense research on the design and fabrication of highly efficient, inexpensive, and stable non-noble earth-abundant metal catalysts with remarkable catalytic activity for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Morphology control of the catalysts is widely implemented as an effective strategy to change the surface atomic coordination and increase the catalytic behavior of the catalysts. In this study, we have designed a series of Mn–Co catalyts with different morphologies on the graphite paper substrate to enhance OER and HER activities in alkaline media. The prepared catalysts with different morphologies were successfully obtained by adjusting the amount of ammonium fluoride (NH4F) in the hydrothermal process. The electrochemical tests display that the cubic-like Mn–Co catalyst with pyramids on the faces at a concentration of 0.21 M NH4F exhibits the best activity toward both OER and HER. The cubic-like Mn–Co catalyst with pyramids on the faces showed overpotentials of 240 and 82 mV at a current density of 10 mA cm–2 for OER and HER, respectively. Also, the cubic-like Mn–Co catalyst with pyramids on the faces required overpotentials of 319 and 216 mV to reach the current density of 100 mA cm–2 for OER and HER, respectively. The current density of this catalyst at η = 0.32 V was 701.05 mA cm–2 for OER, and for HER, the current density of the catalyst was 422.89 mA cm–2 at η = 0.23 V. The Tafel slopes of the Mn–Co catalyst with cubic-like structures with pyramids on the faces were 78 and 121 mV dec–1 for OER and HER, respectively. A two-electrode overall water electrolysis system using this bifunctional Mn–Co catalyst exhibited low cell voltages of 1.60 in the alkaline electrolyte at the standard current density of 10 mA cm–2 with appropriate stability. These electrochemical merits exhibit the considerable potential of the cubic-like Mn–Co catalyst with pyramids on the faces for bifunctional OER and HER applications.

Highly active NiFe LDH anchoring on cobalt carbonate hydroxide for efficient electrocatalytic 5-hydroxymethylfurfural oxidation towards 2,5-furandicarboxylic acid

“…As the process continues, NH 3 dissolution in H 2 O leads to the formation of NH 4 + and OH À (eqn (8)), while CO 2 and water interact to generate CO 3 2À and H + (eqn ( 9)). Thus, cobalt carbonate hydroxide is formed by the following mechanism: 32,33 Co 2+ + F À -CoF + ( 6)…”

“…As the process continues, NH 3 dissolution in H 2 O leads to the formation of NH 4 + and OH − (eqn (8)), while CO 2 and water interact to generate CO 3 2− and H + (eqn (9)). Thus, cobalt carbonate hydroxide is formed by the following mechanism: 32,33 Co 2+ + F − → CoF + CO(NH 2 ) 2 + H 2 O → 2NH 3 + CO 2 NH 3 + H 2 O → NH 4 + + OH − CO 2 + H 2 O → CO 3 2− + 2H + CoF + + OH − + 0.5CO 3 2− + 0.11H 2 O → Co(CO 3 ) 0.5 (OH)0.11H 2 O + F − …”

Tailoring supports for enhancing the electrocatalytic hydrogen evolution performance of platinum species: a review

“…Morphology control of the supports is extensively utilized as an efficient method to tune surface atomic coordination and enhance the catalytic activity. 117 Recently, metal phosphides have garnered great attention owing to their ideal conductivity, high corrosion resistance, and excellent catalytic activity, 33 which are hailed as promising supports for noble metals. In alkaline solution, the protons for the HER come from water dissociation.…”

Heterostructure Interface Engineering in CoP/FeP/CeOx with a Tailored d-Band Center for Promising Overall Water Splitting Electrocatalysis

“…The significant threat of energy crisis and environmental issues caused by fossil fuel combustion necessitates researchers to explore alternative energy sources, in which hydrogen (H 2 ) is deemed to be a futuristic renewable energy vector due to its high gravimetric energy density (142 MJ kg –1 ) and unpolluted products. − It also requires zero-carbon emission technology during its production process, achieving a carbon-neutral society. Electrochemical water splitting driven by electricity conversion from intermittent energy sources (wind or solar) has been regarded as a promising technology for green hydrogen production, playing a vital role in the hydrogen economy. , Unfortunately, this intriguing technology is hampered by its low energy efficiency and diminished by the sluggish kinetics of the anodic oxygen evolution reaction (OER) and the cathodic hydrogen evolution reaction (HER) .…”