Metal-ionic-conductor potassium ferrite nanocrystals with intrinsic superhydrophilic surfaces for electrocatalytic water splitting at ultrahigh current densities

Abstract

Developing new electrocatalyst with high activity and good stability for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), in particular superhydrophilic one that can significantly enhance mass transfer between...

Fascinating Tin Effects on the Enhanced and Large-Current-Density Water Splitting Performance of Sn–Ni(OH)2

“…The high BE shift (≈+0.15 eV) of O–Ni in Sn–Ni­(OH) 2 is mainly due to the in situ doped Sn . Also, the peak at a BE of 532.1 eV is attributed to the absorbed H 2 O in the air …”

“…Meanwhile, HER performing in alkaline media is more difficult than that in an acidic environment. , Additionally, the benchmark OER (Ru-, Ir-based) and HER (Pt-based) materials are rarely earth-storage materials and cannot be largely applied . Also, catalysts with large current densities can satisfy the need of the future large-scale hydrogen industry . Hence, developing a low-cost and efficient bifunctional catalyst for large-current-density water splitting is still a challenge …”

Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary CoxNi1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

“…The huge consumption of unsustainable carbon-emitting fossil fuels is the primary culprit for the current energy crunch and environmental concerns. , Hydrogen, a carbon-free energy source is a favorable response to confront the energy crisis and environmental issues such as global warming. , Discovering a completely new, environmentally benign, cheap, and efficacious strategy to generate hydrogen is a persistent challenge. Electrochemical water splitting stands out among other systems regarding its benefits including hydrogen production with high purity and leaving no carbon footprints. − This process consists of two half-reactions, namely, hydrogen evolution reaction (HER) on the cathode and oxygen evolution reaction (OER) on the anode. , So far, precious-metal-based electrocatalysts such as Pt/C and RuO 2 have been identified as state-of-the-art materials to drive the reaction and lower the overpotential higher than the theoretical one, 1.23 V. , …”

“…5−7 This process consists of two half-reactions, namely, hydrogen evolution reaction (HER) on the cathode and oxygen evolution reaction (OER) on the anode. 6,8 So far, preciousmetal-based electrocatalysts such as Pt/C and RuO 2 have been identified as state-of-the-art materials to drive the reaction and lower the overpotential higher than the theoretical one, 1.23 V. 9,10 Over the past decades, plenty of attempts have been made to design and develop catalysts that alloys, 11−13 carbides, 14,15 nitrides, 16,17 oxides, 18−20 phosphides, 21−23 borides, 24,25 and chalcogenides 26,27 are some of the materials that have been widely explored. Amidst a wide spectrum of electrocatalytic chemicals, the well-known metal compounds of Fe, Co, and Nilocated in the same group with Ru, Ir, and Pt, individually and hence expected to show relatively identical catalytic traits 5 and different compositions of their mixed oxides are believed to have outstanding catalytic activity for electrolysis of water.…”

Large‐Scale Synthesis of Spinel NixMn3‐xO4 Solid Solution Immobilized with Iridium Single Atoms for Efficient Alkaline Seawater Electrolysis

“…e) Comparison of operation voltages required to achieve the current density of 500 mA cm –2 with benchmarking works. [ 50–54 ] f) Optical image of Ir 1 /Ni 1.6 Mn 1.4 O 4 ‖Pt/C electrode pairs driven by silicon PV in 0.5 m KOH + seawater.…”