Integration of partially phosphatized bimetal centers into trifunctional catalyst for high-performance hydrogen production and flexible Zn-air battery

Abstract

The development of robust and efficient trifunctional catalysts showing excellent oxygen evolution reaction (OER), oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) kinetics has been challenging. Herein, we prepared a hybrid iron and cobalt-based metal alloy phosphide on a phosphorus and nitrogen co-doped carbon substrate (FeCo-P/PNC) as a catalyst using a one-step Pregulation method. The catalyst exhibited a positive half-wave potential of 0.86 V versus the reversible hydrogen electrode (RHE) for ORR, and low overpotentials of 350 and 158 mV for OER and HER, respectively, to achieve a current density of 10 mA cm −2 . Density functional theory calculations demonstrated the dominant role of P in both FeCo phosphide and carbon matrix, which led to the good ORR, OER and HER kinetics. The assembled aqueous and flexible Zn-air batteries with FeCo-P/PNC as the air cathode displayed excellent peak power densities of 195.1 and 90.8 mW cm -2 , respectively, as well as outstanding charging-discharging performance, long lifetime, and high flexibility. Moreover, the self-powered overall water-splitting cell exhibited a low working voltage of 1.71 V to achieve a current density of 10 mA cm −2 , confirming its excellent multifunctional OER/ORR/HER activity.

Bifunctional BiPd Alloy Particles Anchored on Carbon Matrix for Reversible Zn–CO2 Battery

“…The FAO performance of BiPdC and tolerance of catalysts were evaluated by cyclic voltammetry (CV) and chronoamperometric curves (Figure c,d). − Compared with BiC catalyst, BiPdC and 2BiPdC exhibit distinct oxidation peaks for FAO at 6.2 and 5.4 mA cm –2 current density, respectively (Figure c). Similarly, prolonged chronoamperometric curves have demonstrated that the current density of BiPdC and 2BiPdC was reduced to 4.26 mA cm –2 (14.40% of its original value) and 0.63 mA cm –2 (7.49% of its original value), respectively, and becomes stabilized after 10 h under optimal FAO potential (Figure d).…”

Fe and P dual-doped nickel carbonate hydroxide/carbon nanotube hybrid electrocatalysts for an efficient oxygen evolution reaction

“…Apart from improving the intrinsic activity via element doping, hybridization of the electrocatalyst with carbon support could improve the conductivity and expedite the electron transfer efficiency, and in consequence, boost the OER activity. [21][22][23][24] Therefore, the combination of dual-doping and carbon decorating engineering to improve the intrinsic activity of activity sites and the conductivity of electrocatalysts should be a feasible approach to enhance the OER activity of TMCHs, but remains a challenge.…”

CoNi Nanoparticle-Decorated ZIF-67-Derived Hollow Carbon Cubes as a Bifunctional Electrocatalyst for Zn–Air Batteries

“…Far-reaching investigations targeting the design and development of alternative electrocatalysts for Zn–air batteries have appeared. In particular, heteroatom-doped carbon nanomaterials, such as N-doped graphene nanosheets, carbon aerogels, and hollow mesoporous carbon nanospheres, have been explored extensively as they exhibit impressive bifunctional catalytic activity and durability. − Transition metal nanoparticles (e.g., Mn 3 O 4 , Fe 3 O 4 , and Co 3 O 4 ) supported by carbon nanomaterials have also shown promising Zn–air battery performance. − Furthermore, metal–organic frameworks (MOFs) and zeolitic imidazolate frameworks (ZIFs) have gained popularity as a precursor in the synthesis of highly porous carbon nanoparticles as Zn–air battery catalysts. − …”