Fe-MOF-Derived Efficient ORR/OER Bifunctional Electrocatalyst for Rechargeable Zinc–Air Batteries

Abstract

The construction of an efficient oxygen reduction reaction and oxygen evolution reaction (ORR/OER) bifunctional electrocatalyst is of great significance but still remains a giant challenge for high-performance metal−air batteries. In this study, uniform FeS/Fe 3 C nanoparticles embedded in a porous N,S-dual doped carbon honeycomb-like composite (abbr. FeS/Fe 3 C@NS-C-900) have been conveniently fabricated by pyrolysis of a single-crystal Fe-MOF, which has a low potential gap ΔE of ca. 0.72 V, a competitive power density of 90.9 mW/cm 2 , a specific capacity as high as 750 mAh/g Zn , and excellent cycling stabilities over 865 h (1730 cycles) at 2 mA/cm 2 when applied as a cathode material for rechargeable zinc−air batteries. In addition, the two series-linked Zn−air batteries successfully powered a 2.4 V LED light as a real power source. The efficient ORR/OER bifunctional electrocatalytic activity and longterm durability of the obtained composite might be attributed to the characteristic honeycomb-like porous structure with sufficient accessible active sites, the synergistic effect of FeS and Fe 3 C, and the N,S codoped porous carbon, which provides a promising application potential for portable electronic Zn−air battery related devices.

Amorphous C,N Codoping Cobalt Phosphates Simply Fabricated via a Mild Host–Guest Strategy as Bifunctional Electrocatalysts for Zinc–Air Batteries

“…Compared with CNCP, the N 1s spectra for CNCP-450 were deconvoluted into pyridinic N (399.1 eV), N─Co (400.6 eV), pyrrolic N (401.9 eV), and C─N (405.5 eV) in Figure 3c. [43,44,[47][48][49] Especially, the obvious shift of the C─N binding energy between CNCP and CNCP-450 should be ascribed to the formation of different chemical environments in the carbonization process. The former was derived from organic components (H 2 en 2þ ), while the latter could be attributed to the formation of C,N codoped into CNCP-450.…”

Three‐Dimensional Electrodes for Oxygen Electrocatalysis

“…However, the methods for constructing 3D electrodes should be further improved, especially the design of catalysts with much higher dispersibility, highly scalable and much consistent with the theoretical schematic. Fe-N-C/NOMC 0.93 --1.55 133 [157] Co-NCF 0.83 --1.31 134 [83] IOSHs-NSC-Co 9 S 8 0.82 1.64 0.82 1.497 133 [158] CoFe/SN-C-25 0.843 1.504 0.661 1.45 169 [159] FeCo-NCNFs-800 0.797 1.686 0.869 1.48 74 [160] FeS/Fe 3 C@NS-C-900 0.78 1.5 0.72 1.455 90.9 [161] Co 9 S 8 -NSHPCNF 0.82 1.58 0.76 1. 44 113 [162] FeS/Fe 3 C@N-S-C-800 0.87 1.8 0.93 1.43 63 [163] Ni 3 Fe/N-C 0.81 1.54 0.73 1.5 128 [164] Co/S/N-800 0.831 1.591 0.76 1.539 76 [165] CoFe/NC-0.2-900@NiFeP/NF 0.82 --1.423 173 [166] FeN FePc@N,P-D 0.903 1.56 0.657 1.45 120 [21] Co-CoO x /N-C NSAs 0.83 1.508 0.678 1.32 20.7 [177] Mn-SA 0.87 ---150 [178] Co 9 S 8 /S-CNTs 0.81 1.561 0.751 1.472 60.8 [179] Co@NSC-acid 0.82 --1.42 73.5 [180] Co 9 S 8 /P@CS - Fe-NPC-1000 0.79 ---1.5 ~70 [186] (iv) In a metal-air battery, the reaction system related to oxygen-involved process is much complex compared with the electrocatalytic ORR and OER reactions in threeelectrode system.…”

Design Engineering, Synthesis Protocols, and Energy Applications of MOF-Derived Electrocatalysts

“…There are numerous classes of metalbased MOFs as Cu-MOFs, Zr-MOFs, Ni-MOFs, and Cd-MOFs that were broadly explored as template precursors to obtain porous metal-nanocarbon electrocatalysts for fuel cells [138][139][140]. Kim et al [139] presented a simple process for the efficient filling of Cu-and Ni-HKUST-1.…”