Low‐cost and high activity bifunctional oxygen electrocatalysts are at the heart of developing advanced rechargeable Zn‐air batteries (ZABs), but the challenges are great. Herein, a highly efficient hybrid catalyst, consisting of S, N co‐doped nanoporous carbon (SNC) coupled with in‐situ growth layered double (Ni, Fe) hydroxide (LDH), was derived from the biomass peach gum by a series of treatments, including hydrothermal carbonization, alkali activation, S/N co‐doping and metal‐coprecipitation process. Benefiting from the coexistence of active sites for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), the hybrid (NiFe‐LDH/SNC) reveals excellent bifunctional electrocatalytic activity with a small ΔE of 794 mV. Furthermore, as the cathode bifunctional catalyst for ZAB, the battery with NiFe‐LDH/SNC displays a large open‐circuit voltage of 1.36 V, a high power density/specific capacity of 100 mW cm−2/816 mAh gZn−1, and superior cycling durability up to 500 h at a charge/recharge current density of 2 mA cm−2, indicating its great application potential in the rechargeable metal‐air batteries.
Rationally tailoring a nonprecious metal and highly active bifunctional catalyst with desirable nanoarchitecture and composition for water electrolysis is of key value for sustainable and clean energy production. Herein, we designed nanoporous Ndoped carbon (NC) as a support for dispersion and anchoring of bimetallic phosphide nanoparticles (CoP/Ni 2 P). Thanks to the uniformly anchored nanosized CoP/Ni 2 P nanoparticles offering rich active sites and the coupling effect between these nanoparticles and a nanoporous NC support to ensure promising conductivity and structural stability, the as-prepared hybrid (CoP(Ni 2 P)/NC) exhibits prominent electrocatalytic performances toward hydrogen evolution (or oxygen evolution) in alkaline electrolytes, in terms of a small overpotential of 216 mV (or 338 mV) at 10 mA cm −2 and a low Tafel slope of 84 mV dec −1 (or 60 mV dec −1 ), as well as exceptional long-term stability.
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