A defect-driven atomically dispersed Fe–N–C electrocatalyst for bifunctional oxygen electrocatalytic activity in Zn–air batteries

Zhang, Jie; Chen, Jinwei; Luo, Yan; Chen, Yihan; Luo, Yingjian; Zhang, Chenyang; Xue, Yali; Liu, Honggang; Wang, Gang; Wang, Ruilin

doi:10.1039/d0ta11859a

Cited by 63 publications

(37 citation statements)

References 54 publications

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“…Nevertheless, large-scale applications of ZABs are still restricted due to the sluggish multielectron transfer process of OER and ORR. As of now, noble metal catalysts such as IrO 2 and RuO 2 for OER and Pt/C for ORR are regarded as benchmark catalysts . Although these catalysts exhibit excellent electrocatalytic activities, their high cost, limited stability, scarcity, and the inability of a single catalyst to perform both reactions hinder their widespread applications .…”

Section: Introductionmentioning

confidence: 99%

“…As of now, noble metal catalysts such as IrO 2 and RuO 2 for OER and Pt/ C for ORR are regarded as benchmark catalysts. 4 Although T h i s c o n t e n t i s these catalysts exhibit excellent electrocatalytic activities, their high cost, limited stability, scarcity, and the inability of a single catalyst to perform both reactions hinder their widespread applications. 5 Therefore, current research is primarily aimed toward replacing these precious noble metal catalysts with cost-effective and high-performance catalysts for ZABs.…”

Section: Introductionmentioning

confidence: 99%

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Nickel Iron Phosphide/Phosphate as an Oxygen Bifunctional Electrocatalyst for High-Power-Density Rechargeable Zn–Air Batteries

Thakur

Kumar

Mandal

et al. 2021

ACS Appl. Mater. Interfaces

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The evolution of an effective oxygen electrocatalyst is of great importance for the widespread application of Zn–air batteries but remains an immense challenge. Thus, an efficient catalyst toward the oxygen evolution reaction and oxygen reduction reaction (OER and ORR) is highly essential for high-performance Zn–air batteries. Here, we have reported bifunctional nickel iron phosphide/phosphate (NiFeP/Pi) catalysts with various Ni/Fe ratios toward oxygen electrocatalysis in alkaline media. These catalysts are highly active toward OER and ORR, wherein NiFe(1:2)P/Pi exhibits a low OER overpotential of 0.21 V at 10 mA cm–2 and a high ORR onset potential (0.98 V vs RHE) with the lowest potential difference (ΔE = E 10 – E 1/2) of 0.62 V, which surpasses that of the benchmark Pt/C and RuO2 catalyst as well as those of most previously reported bifunctional catalysts. Furthermore, the NiFe(1:2)P/Pi-based Zn–air battery demonstrates a very high power density of 395 mW cm–2 and outstanding discharge capacity of 900 mAh g–1@10 mA cm–2 along with steady cyclability, maintaining 98% of the round trip efficiency over 300 cycles. These results are helpful for a good understanding of the composition–activity relation with a certain band gap toward high-performance Zn–air batteries.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nickel Iron Phosphide/Phosphate as an Oxygen Bifunctional Electrocatalyst for High-Power-Density Rechargeable Zn–Air Batteries

Thakur

Kumar

Mandal

et al. 2021

ACS Appl. Mater. Interfaces

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“…7b, the electrons transfer from Fe/N-G-800/FePc and Fe@Fe/N-G-800 to adsorbed O 2 are 0.26 e and 0.31 e , respectively. 55,56 The electron localization functions shown in Fig. S19† also illustrate this point.…”

Section: Resultsmentioning

confidence: 59%

Promoting oxygen reduction via crafting bridge-bonded oxygen ligands on a single-atom iron catalyst

et al. 2022

Inorg. Chem. Front.

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“…Thus, the 399 eV peak in CTNC-Fe in Figure 4a is likely related to either N−Fe moieties, the Fe being coordinated by pyridinic N, or there is a mixture of N−Fe and pyridinic N. The same can be said for the pyrrolic/graphitic N peak as it manifests at 400.8 eV in P-CTNC (Figure S3d). The presence of Fe in CTNC-Fe increased the deconvoluted peak energy values of pyridinic N and pyrrolic/graphitic N ∼0.4 eV, which means it is likely that N−Fe moieties are composed of not only pyridinic N but also graphitic and pyrrolic N. 65 Furthermore, the atom percent of pyrrolic and graphitic N is almost double that of pyridinic N as seen in Table S1. Therefore, even if it was less energetically favorable for Fe to interact with graphitic and pyrrolic N to form FeN x -active sites than it is with pyridinic N, the greater concentration of these N species would make up for it.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

Fe-Doped Copolymer-Templated Nitrogen-Rich Carbon as a PGM-Free Fuel Cell Catalyst

Torres

Sun

Yuan

et al. 2021

ACS Appl. Energy Mater.

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Platinum group metal-free (PGM-free) catalysts present a promising opportunity to make hydrogen fuel cells more affordable; however, issues with stability and electrochemical activity continue to hinder their application. Recent studies point to the availability of nitrogen and a controlled mesoporous structure as avenues of improvement. To address this need, copolymer-templated nitrogen-enriched carbon (CTNC) was used as the precursor to prepare PGM-free catalysts for the oxygen reduction reaction (ORR). By employing its rich nitrogen content and interconnected mesoporous structure, a significant amount of Fe–N–C-active sites were formed by co-annealing CTNC with FeSO4. The formed N/Fe co-doped nanocarbon (CTNC-Fe) catalyst exhibits good electrochemical activity with a half-wave potential of 0.781 V vs normal hydrogen electrode (NHE), a total surface area of 400 m2/g, and a power density of 180 mW/cm2. The block copolymer (BCP) was made by atom transfer radical polymerization (ATRP), which allows control and tunability of the block copolymer. This work opens new opportunities to improve the electrochemical activity and stability of PGM-free catalysts by controlled polymerization techniques that precisely tune the pore structure and maximize nitrogen content to improve the formation of active sites in the catalysts.

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A defect-driven atomically dispersed Fe–N–C electrocatalyst for bifunctional oxygen electrocatalytic activity in Zn–air batteries

Abstract: The optimized Fe–N–NDC-1-900 exhibits robust anchoring ability to immobilize atomic Fe species with abundant Fe–N4 sites, demonstrating excellent electrocatalytic activity in both the ORR and OER.

Cited by 63 publications

References 54 publications

Nickel Iron Phosphide/Phosphate as an Oxygen Bifunctional Electrocatalyst for High-Power-Density Rechargeable Zn–Air Batteries

Nickel Iron Phosphide/Phosphate as an Oxygen Bifunctional Electrocatalyst for High-Power-Density Rechargeable Zn–Air Batteries

Promoting oxygen reduction via crafting bridge-bonded oxygen ligands on a single-atom iron catalyst

Fe-Doped Copolymer-Templated Nitrogen-Rich Carbon as a PGM-Free Fuel Cell Catalyst

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