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The forest-like NiS hierarchical architectures demonstrated superior electrochemical performance with excellent cycling stability.

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A potentiodynamic polarization approach is presented for the preparation of battery-type phosphorus-containing amorphous trimetal nickel–ruthenium–cobalt hydroxide nanofibers for high-energy hybrid supercapacitors.

Developing highly efficient noble‐metal‐free electrocatalysts with a scalable and environmentally friendly synthesis approach remains a challenge in the field of electrocatalytic water splitting. To overcome this problem, self‐supported fluorine‐modified 2D ultrathin nickel hydroxide (F‐Ni(OH)2) nanosheets (NSs) for the oxygen evolution reaction (OER) and urea oxidation reaction (UOR) are prepared with a scalable and ascendant one‐step synthesis route. The enhanced redox activity, electrical conductivity and a great number of exposed active sites of the heterogeneous catalysts improve charge migration for the electrocatalytic reactions. The density of states of the d orbitals of the Ni atoms significantly increases near the Fermi level, thereby indicating that the Ni atoms near the F‐dopants promote electrical conduction in the Ni(OH)2 monolayer. The F‐Ni(OH)2 electrocatalyst exhibits notable OER and UOR activity with onset potentials of 1.43 and 1.16 V versus RHE, respectively required to reach 10 mA cm−2, which are comparable to those of commercial noble‐metal‐based electrocatalysts. With RuCo‐OH nanospheres, the settled F‐Ni(OH)2||RuCo‐OH cell requires merely 1.55 and 1.37 V to reach 10 mA cm−2 with superb durability for 24 h in overall water and urea electrolysis, respectively. Overall, high‐quality, and efficient noble‐metal‐free electrocatalysts for overall water and urea electrolysis can be prepared with a simple, scalable, and reproducible preparation method.

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