Innovative electrolytic cell of sulfur-doped MnO2 nanorods: Synergistic hydrogen production and formaldehyde degradation at an ultra-low electric energy consumption

Coupled W–Co2P hybrid nanosheets as a robust bifunctional electrocatalyst for hydrazine-assisted hydrogen production

“…9–11 In recent years, the efficiency of electrocatalytic water splitting has been improved by replacing the anodic OER with more favorable oxidation of small molecules. 12–17 Among them, the HzOR (hydrazine + 4OH − → N 2 + 4H 2 O + 4e − ) has the unique characteristic of lower theoretical potential of −0.33 V. 18–20…”

“…[9][10][11] In recent years, the efficiency of electrocatalytic water splitting has been improved by replacing the anodic OER with more favorable oxidation of small molecules. [12][13][14][15][16][17] Among them, the HzOR (hydrazine + 4OH À -N 2 + 4H 2 O + 4e À ) has the unique characteristic of lower theoretical potential of À0.33 V. [18][19][20] The electrocatalysts of hydrazine-coupled water splitting have been widely reported. Cobalt or nickel phosphides such as CoP-Co 2 P@CC-300, Co x P@Co 3 O 4 , CoP-NWA@CP, Ni@NiP/ C, and Ni 2 P-HNTs/NF are the most common materials for the HER or HzOR due to the unique 3d electronic configuration, high conductivity and abundant reserves.…”

Insights from Ethylene Glycol Oxidation toward Reduction in the Overpotential Using Sonochemically Derived Orthorhombic CoV2O6·2H2O Sheetlike Structures

“…However, further increase in the EG concentrations to 12.5, 37.5, and 50 mmol results in higher overpotentials, particularly at higher current densities (>200 mA cm –2 ). The higher concentration of EG results in greater oxidized products, which may be adsorbed on the active sites of CoV 2 O 6 ·2H 2 O NSs and thus impede the OER process. , Therefore, the optimum concentration required for superior OER performance is 10 mmol of EG. Thus, rationally modulating the electrolyte composition can serve as an effective means to improve the OER/HER.…”

“…A few recent reports emphasized that hybrid electrolyte systems can thermodynamically drive both the cathodic hydrogen evolution reaction (HER) and anodic oxidation reaction through consuming less potential and less energy and simultaneously generating value-added products. Toward this end, the coupling of HER with the oxidation of glucose, alcohols, − aldehydes, − hydrazine, and urea has been frequently reported. These organic substrates have smaller positive onset potentials than water oxidation, and thus, the cell voltage of a hybrid electrolyzer is expected to decline with simultaneous increased production of H 2 .…”

Water electrolysis for hydrogen production: from hybrid systems to self-powered/catalyzed devices

“…To date, the reported FOR catalysts have been concentrated on Cu-based materials, such as Cu 2 O catalyst, 420 ZrO 2 –CuO/Au, 421 Ni doped Cu, 422 Cu 2 O, 423 hollow PdCu alloy, 424 and Cu nanosheet arrays. 425 Some other transition metal-based catalysts, such as Ni nanowires, 426 S-Ni@Ni(OH )2 /NF, 427 NiCo–NiCoP@PCT, 428 NiMn phosphates, 429 S-doped MnO 2 , 430 and Co–N x –C@Co, 431 have also been used for the FOR.…”