Development and fabrication of electrodes with favorable electrocatalytic activity, low-cost, and excellent electrocatalytic durability are one of the most important issues in the hydrogen production area using the electrochemical water splitting process. We use the pulse electrodeposition method as a versatile and cost-effective approach to synthesize three-dimensional Ni−Fe−P electrocatalysts on nickel nanostructures under various applied frequencies and duration times, in which nanostructures exhibit excellent intrinsic electrocatalytic activity. Benefiting from the threedimensional structure, as well as the simultaneous presence of the three elements nickel, iron, and phosphorus, the electrode fabricated at the optimal conditions has indicated outstanding electrocatalytic activity with a η 10 of 66 and 198 mV for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, in a 1.0 M KOH solution. Also, the water electrolysis cell constructed with this electrode and tested as a bifunctional electrode exhibited 1.508 V for 10 mA cm −2 in overall water splitting. In addition, the lowest amount of potential change in 100 mA cm −2 was observed for HER and OER, indicating excellent electrocatalytic stability. This study proposes a binder-free and economical technique for the synthesis of three-dimensional electrocatalysts.
Ni–Co–Fe mixed sulfide ultrathin nanosheets obtained by electrodeposition method exhibits excellent electrocatalytic activity. The Ni–Co–Fe nanosheets require the overpotential of 106 and 207 mV to generate 10 mA cm−2 current density for the HER, and OER, respectively.
We present a rational approach to the fabrication of Co and N co-doped porous hierarchical carbon nanosheet catalysts (CoNPCs). The CoNPCs exhibit excellent performance as an efficient non-precious metal electrode in alkaline fuel cell and Zn–air battery devices.
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