Metastable Rock Salt Oxide-Mediated Synthesis of High-Density Dual-Protected M@NC for Long-Life Rechargeable Zinc–Air Batteries with Record Power Density

Tang, Tang; Jiang, Wenjie; Liu, Xiaozhi; Deng, Jun; Niu, Shuai; Wang, Bin; Jin, Shifeng; Zhang, Qiang; Gu, Lin; Hu, Jin‐Song

doi:10.1021/jacs.0c01349

Cited by 176 publications

(126 citation statements)

References 52 publications

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“…The transfer number of ≈4 indicates the predominant 4‐electron transfer process for OH − yielding. [ 51–53 ] MnS also shows a fair OER activity with a potential of 1.813 V at 10 mA cm −2 ( E j =10 ). While the ORR activity of Ni x Co 1− x S 2 ( E 1/2 = 0.710 V) is inferior to MnS, Ni x Co 1− x S 2 material shows a more favorable OER activity indicated by a E j =10 of 1.610 V. It suggests that the introduction of Ni x Co 1− x S 2 into the MnS will realize a significant improvement of the OER activity.…”

Section: Resultsmentioning

confidence: 99%

A Function‐Separated Design of Electrode for Realizing High‐Performance Hybrid Zinc Battery

Zhong

Liu

et al. 2020

Advanced Energy Materials

101

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A rechargeable hybrid zinc battery is developed for reaching high power density and high energy density simultaneously by introducing an alkaline Zn–transition metal compound (Zn–MX) battery function into a Zn–air battery. However, the conventional single‐layer electrode design cannot satisfy the requirements of both a hydrophilic interface for facilitating ionic transfer to maximize the Zn–MX battery function and a hydrophobic interface for promoting gas diffusion to maximize the Zn–air battery function. Here, a function‐separated design is proposed, which allocates the two battery functions to the two faces of the cathode. The electrode is composed of a hydrophobic MnS layer decorated with Ni–Co–S nanoclusters that allows for smooth gas diffusion and efficient oxygen electrocatalysis and a hydrophilic NixCo1−xS2 layer that favors fast ionic transfer and superior performance for energy storage. The battery with the function‐separated electrode shows a high short‐term discharge voltage of ≈1.7 V, an excellent high‐rate galvanostatic discharge–charge with a power density up to 153 mW cm−2 at 100 mA cm−2, a good round‐trip efficiency of 75% at 5 mA cm−2, and a robust cycling stability for 330 h with an excellent voltage gap of ≈0.7 V at 5 mA cm−2.

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Section: Resultsmentioning

confidence: 99%

A Function‐Separated Design of Electrode for Realizing High‐Performance Hybrid Zinc Battery

Zhong

Liu

et al. 2020

Advanced Energy Materials

101

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“…On the other hand, it has been reported that SCN − is poisonous for Fe−N x sites in the catalysis of ORR, [53] so the RDE measurements of the oxygen reduction activity of PBCs‐900 in 0.1 M KOH with and without the addition of 10 mM KSCN were performed. It can be seen from Figure 6f that no obvious change occurs for the onset potential of PBCs‐900 with and without SCN − , but the E 1/2 and J L of PBCs‐900 with the addition of SCN − decreases by ∼40 mV and ∼0.4 mA cm −2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…After the acid leaching process, the N 1s high resolution spectrum and the contents of the total N species of acid-leached PBCs-900 were shown in Figure 6d and Figure 6e, respectively. It can be seen from the deconvoluted N 1s high-resolution spectra that the content of total N species and the percentage of pyridinic N in total N species for acidleached PBCs-900 decreased remarkably compared with that of PBCs-900, this may due to the wreck of FeÀ N bond and protonation pyridinic-N. [52] On the other hand, it has been reported that SCN À is poisonous for FeÀ N x sites in the catalysis of ORR, [53] so the RDE measurements of the oxygen reduction activity of PBCs-900 in 0.1 M KOH with and without the addition of 10 mM KSCN were performed. It can be seen from Figure 6f that no obvious change occurs for the onset potential of PBCs-900 with and without SCN À , but the E 1/2 and J L of PBCs-900 with the addition of SCN À decreases by ∼ 40 mV and ∼ 0.4 mA cm À 2 , respectively.…”

Section: Electrochemical Characterizationsmentioning

confidence: 99%

NaCl‐Promoted Hierarchically Porous Carbon Self‐Co‐Doped with Iron and Nitrogen for Efficient Oxygen Reduction

et al. 2020

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Exploring low-cost, highly effective and durable nonprecious electrocatalysts for oxygen reduction reaction (ORR) is the key issue for large-scale applications of fuel cell technology. However, preparation of FeÀ NÀ C ORR catalysts using biomass without any external sources containing nitrogen and iron elements has rarely been reported. In this paper, hierarchically porous carbon self-co-doped with Fe and N promoted by NaCl has been successfully synthesized through a facile one-step pyrolysis method using pig blood curds (PBCs) without any external Fe and N. Besides, Fe and N are uniformly dispersed within the as-synthesized electrocatalysts. Electrochemical tests showed that the best performing FeÀ NÀ C electrocatalyst exhibited superior ORR catalytic activity with a positive halfwave potential of 0.834 V vs. RHE and a high limiting current density of 5.6 mA cm À 2. Furthermore, the as-synthesized electrocatalyst also showed remarkable long-term stability as well as superior methanol tolerance, outperforming commercial Pt/ C. The facile synthesis of high-performance FeÀ NÀ C electrocatalysts derived from PBCs using NaCl as the pore former provides fundamental insight and offers important guidelines for the future design of biomass-derived carbons in specific energy applications.

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“…Very recently, we discovered a metastable rocksalt oxidemediated strategy. It was able to produce small-size, highdensity, uniformly-distributed, and well-protected M@NC sites [94]. To avoid the uncontrollable thermal decomposition and inevitable aggregation of metal nanoparticles, prepreparing well-dispersed precursors such as metal oxide nanoparticles on support instead of direct pyrolysis of metal sources would be an option for achieving the goal.…”

Section: Metastable Rocksalt-oxide Mediated Strategymentioning

confidence: 99%

“…a) Scheme for the synthesis of high-density well-dispersed Co 2 Fe 1 @NC via a rocksalt oxide-mediated strategy; (b) overview SEM image, (c) HRSEM image, and (d) HRTEM image of Co 2 Fe 1 @NC; (e) Zn-air performance and (f, g) long-time cycling of the devices with Co 2 Fe 1 @NC and Pt/C-IrO 2 . Adapted with permission from Ref [94],. Copyright by the American Chemical Society (color online).…”

mentioning

confidence: 99%

Advanced transition metal/nitrogen/carbon-based electrocatalysts for fuel cell applications

et al. 2020

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The development of advanced transition metal/nitrogen/carbon-based (M/N/C) catalysts with high activity and extended durability for oxygen reduction reaction (ORR) is critical for platinum-group-metal (PGM) free fuel cells but still remains great challenging. In this review, we summarize the recent progress in two typical M/N/C catalysts (atomically dispersed metalnitrogen-carbon (M-N-C) catalysts and carbon-supported metal nanoparticles with N-doped carbon shells (M@NC)) with an emphasis on their potential applications in fuel cells. Starting with understanding the active sites in these two types of catalysts, the representative innovative strategies for enhancing their intrinsic activity and increasing the density of these sites are systematically introduced. The synergistic effects of M-N-C and M@NC are subsequently discussed for those M/N/C catalysts combining both of them. To translate the material-level catalyst performance into high-performance devices, we also include the recent progress in engineering the porous structure and durability of M/N/C catalysts towards efficient performance in fuel cell devices. From the viewpoint of industrial applications, the scale-up cost-effective synthesis of M/N/C catalysts has been lastly briefed. With this knowledge, the challenges and perspectives in designing advanced M/N/C catalysts for potential PGM-free fuel cells are proposed.

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Metastable Rock Salt Oxide-Mediated Synthesis of High-Density Dual-Protected M@NC for Long-Life Rechargeable Zinc–Air Batteries with Record Power Density

Cited by 176 publications

References 52 publications

A Function‐Separated Design of Electrode for Realizing High‐Performance Hybrid Zinc Battery

A Function‐Separated Design of Electrode for Realizing High‐Performance Hybrid Zinc Battery

NaCl‐Promoted Hierarchically Porous Carbon Self‐Co‐Doped with Iron and Nitrogen for Efficient Oxygen Reduction

Advanced transition metal/nitrogen/carbon-based electrocatalysts for fuel cell applications

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