Stabilizing atomic Pt with trapped interstitial F in alloyed PtCo nanosheets for high-performance zinc-air batteries

Li, Zhao; Niu, Wenhan; Yang, Zhenzhong; Zaman, Nusaiba; Samarakoon, Widitha; Wang, Maoyu; Kara, Abdelkader; Lucero, Marcos; Vyas, Manasi V.; Cao, Hui; Zhou, Hua; Sterbinsky, George E.; Feng, Zhenxing; Du, Yingge; Yang, Yang

doi:10.1039/c9ee02657f

Cited by 118 publications

(101 citation statements)

References 63 publications

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“…The porous structure inhibits the aggregation of cobalt ligands at high temperatures, and cobalt species are dispersed as tiny clusters in carbon nanopores. [ 26–28 ]…”

Section: Figurementioning

confidence: 99%

“…The porous structure inhibits the aggregation of cobalt ligands at high temperatures, and cobalt species are dispersed as tiny clusters in carbon nanopores. [26][27][28] High-resolution transmission electron microscopy (HRTEM) and aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) were also carried out to study the distribution of cobalt clusters in porous carbon. As shown in Figure 1b and Figure S7, Supporting Information, the HRTEM images reveal that the Co/PC samples are mainly composed of porous, highly disordered graphitic carbon particles with diameters of ≈50 nm, and no clear cobalt nanoparticles can be observed.…”

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confidence: 99%

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Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

et al. 2020

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electrocatalysts to improve their catalytic activity and stability, the realization of a stable and efficient ORR on air electrodes remains a challenge. [4] Generally, advanced metal-air fuel cells require high power output and robust stability. It is vital to build a stable triplephase reaction interface on the electrocatalyst to achieve a perfect balance among electron conduction, oxygen gas diffusion, and ion transportation. [5] However, the masking of active sites in the disorderly stacked electrocatalyst layer in a metalair fuel cell results in sluggish electron transfer. This phenomenon will greatly reduce the efficiency of electron and ion transport, leading to a distinct reduction in the power density. [6] Moreover, the fragile triple-phase interface is easily eroded by water under long-term high current discharging, thereby blocking the oxygen gas transport channel, and causing a significant decline in the stability of the Zn-air fuel cell. [7] To address these issues, the most common strategy is to mix the electrocatalyst and hydrophobic polymer to form a stable three-phase interface and gas transmission channel. In this case, excessive polymer addition greatly increases the reaction resistance and reduces the power density of the Zn-air fuel cell. [8-10] However, fabricating binder-free air electrodes by directly growing electrocatalysts on a conductive substrate can significantly enhance the electrical conductivity. Unfortunately, numerous catalytic sites will be eroded by water flooding in the long-term reaction Metal-air fuel cells with high energy density, eco-friendliness, and low cost bring significantly high security to future power systems. However, the impending challenges of low power density and high-current-density stability limit their widespread applications. In this study, an ultrahigh-power-density Zn-air fuel cell with robust stability is highlighted. Benefiting from the water-resistance effect of the confined nanopores, the highly active cobalt cluster electrocatalysts reside in specific nanopores and possess stable triple-phase reaction areas, leading to the synergistic optimization of electron conduction, oxygen gas diffusion, and ion transport for electrocatalysis. As a result, the as-established Zn-air fuel cell shows the best stability under high-current-density discharging (>90 h at 100 mA cm −2) and superior power density (peak power density: >300 mW cm −2 , specific power: 500 Wg cat −1) compared to most reported non-noble-metal electrocatalysts. The findings will provide new insights in the rational design of electrocatalysts for advanced metal-air fuel cell systems. Metal-air fuel cells are indispensable as next-generation energy storage systems because of their high energy density, eco-friendliness, and low cost. [1] However, the low power density and vulnerable stability of metal-air fuel cells seriously impede their large-scale applications. In particular, a highly efficient and stable power output will be indispensable for emergency backup power supply in future smart po...

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“…The porous structure inhibits the aggregation of cobalt ligands at high temperatures, and cobalt species are dispersed as tiny clusters in carbon nanopores. [ 26–28 ]…”

Section: Figurementioning

confidence: 99%

mentioning

confidence: 99%

Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

et al. 2020

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“…However, the PANI nanoflakes become crowed ( Figure S3c 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 122) and (300) planes of the heazlewoodite phase of Ni 3 S 2 (PDF#76-1870), whereas the peaks at 2θ = 44.7, 52.1 and 76.7°belong to metallic Ni (PDF#04-0850) from NF substrate. [12] Compared with Ni 3 S 2 /NF electrode, the PANI/Ni 3 S 2 /NF-100 electrode shows slightly decreased Ni 3 S 2 diffraction peaks probably because that the Ni 3 S 2 nanosheets are covered by PANI nanoflakes layer. There are no diffraction peaks that can be ascribed to PANI due to the amorphous feature of the PANI layer.…”

Section: Resultsmentioning

confidence: 93%

“…XRD patterns of the Ni 3 S 2 /NF and PANI/Ni 3 S 2 /NF‐100 samples are shown in Figure a. The main diffraction peaks at 2 θ =22.1, 31.4, 38.1, 44.7, 50.3 and 55.4° are indexed to the (101), (110), (003), (202), (113), (211), (122) and (300) planes of the heazlewoodite phase of Ni 3 S 2 (PDF#76‐1870), whereas the peaks at 2 θ =44.7, 52.1 and 76.7° belong to metallic Ni (PDF#04‐0850) from NF substrate . Compared with Ni 3 S 2 /NF electrode, the PANI/Ni 3 S 2 /NF‐100 electrode shows slightly decreased Ni 3 S 2 diffraction peaks probably because that the Ni 3 S 2 nanosheets are covered by PANI nanoflakes layer.…”

Section: Resultsmentioning

confidence: 99%

Construction of Hierarchical 2D PANI/Ni₃S₂ Nanosheet Arrays on Ni Foam for High‐Performance Asymmetric Supercapacitors

Cheng

Yang

Han

et al. 2020

Batteries & Supercaps

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In this work, a hierarchical 2D polyaniline (PANI)/Ni3S2 nanosheet arrays on Ni foam (NF) with open network was successfully developed by the growth of Ni3S2 nanosheet arrays derived from 2D Ni−MOF templates followed by the electrodeposition of a layer of PANI nanoflakes. The as‐prepared PANI/Ni3S2/NF was served as self‐standing supercapacitor electrode. The optimized PANI/Ni3S2/NF‐100 electrode exhibits a high areal capacity of 1.56 mA h cm−2 (487.5 mA h g−1) at 5 mA cm−2 and good rate capability (57.7 % retention at 50 mA cm−2), which significantly outperforms individual PANI/NF or Ni3S2/NF. Furthermore, an asymmetric supercapacitor fabricated by PANI/Ni3S2/NF‐100 and activated carbon electrodes can deliver a high energy density of 48.3 W h kg−1 at a power density of 799.8 W kg−1 with outstanding durability (85.7 % retention of the initial capacity) during 15000 consecutive charge‐discharge cycles. The superior electrochemical performance of PANI/Ni3S2/NF‐100 is attributed to the unique hierarchical PANI/Ni3S2 nanosheet arrays structure. Firstly, the hierarchical open network facilitates the electrolyte ions transport. Secondly, the ultrathin 2D Ni3S2 nanosheets lead to abundant electroactive sites for the Faradaic process, and the conductive PANI layer builds superb highway for fast electron transfer. Thirdly, the free‐standing electrode enables fast redox reaction and low interfacial resistance. Finally, the synergetic effect of Ni3S2 and PANI also contributes to the enhanced capacity.

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“…[ 7,10 ] A principal challenge for designing electrocatalysts is the performance‐cost trade‐off of using platinum‐based metals as cathode for the hydrogen evolution reaction (HER). [ 11‐14 ] Yet, the extremely high price and scarcity of Pt‐based catalysts on Earth limit its scalable application. Thus, considerable efforts have been devoted to looking for cheap and efficient catalysts made of cheap materials, [ 15‐20 ] including metal phosphides, sulfides, selenides, MXenes, and so forth.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Boosting pH‐Universal Hydrogen Evolution of Molybdenum Disulfide Particles by Interfacial Engineering^†

et al. 2021

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Main observation and conclusion The design of high‐efficiency non‐noble and earth‐abundant electrocatalysts for hydrogen evolution reaction (HER) is highly paramount for water splitting and renewable energy systems. Molybdenum disulfide (MoS2) with abundant edge sites can be utilized as a promising alternative, but its catalytic activity is greatly related to the pH values, especially in an alkaline environment due to the extremely high energy barriers for water adsorption and dissociation steps. Here we report an exceptionally efficient and stable electrocatalyst to improve the sluggish HER process of layered MoS2 particles in different pH electrolytes, especially in base. The electrocatalyst is constructed by in situ growing selenium‐doped MoS2 (Se‐MoS2) nanoparticles on three‐dimensional cobalt nickel diselenide (Co0.2Ni0.8Se2) nanostructured arrays. Due to the large number of active edge sites of Se‐MoS2 particles exposed at the surface, robust electrical conductivity and large surface area of Co0.2Ni0.8Se2 support, and strong interfacial interactions between Se‐MoS2 and Co0.2Ni0.8Se2, this hybrid catalyst shows very outstanding catalytic HER properties featured by low overpotentials of 30 and 122 mV at 10 and 100 mA/cm2 with good operational stability in base, respectively, which outperforms most of inexpensive catalysts consisting of layered MoS2, transition metal selenides and sulfides, and it performs as well as noble Pt catalysts. Meanwhile, this electrocatalyst is also very active in neutral and acidic electrolytes, requiring low overpotentials of 93 and 94 mV at 10 mA/cm2, respectively, demonstrating its superb pH universality as a HER electrocatalyst with excellent catalytic durability. This study provides a straightforward strategy to construct an efficient non‐noble electrocatalyst for driving the HER kinetics in different electrolytes.

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Stabilizing atomic Pt with trapped interstitial F in alloyed PtCo nanosheets for high-performance zinc-air batteries

Abstract: A novel strategy is designed to stabilize atomic Pt catalysts in alloyed platinum cobalt nanosheets with trapped interstitial fluorine (SA-PtCoF) for zinc-air batteries.

Cited by 118 publications

References 63 publications

Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

Construction of Hierarchical 2D PANI/Ni₃S₂ Nanosheet Arrays on Ni Foam for High‐Performance Asymmetric Supercapacitors

Boosting pH‐Universal Hydrogen Evolution of Molybdenum Disulfide Particles by Interfacial Engineering^†

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Stabilizing atomic Pt with trapped interstitial F in alloyed PtCo nanosheets for high-performance zinc-air batteries

Abstract: A novel strategy is designed to stabilize atomic Pt catalysts in alloyed platinum cobalt nanosheets with trapped interstitial fluorine (SA-PtCoF) for zinc-air batteries.

Cited by 118 publications

References 63 publications

Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

Construction of Hierarchical 2D PANI/Ni3S2 Nanosheet Arrays on Ni Foam for High‐Performance Asymmetric Supercapacitors

Boosting pH‐Universal Hydrogen Evolution of Molybdenum Disulfide Particles by Interfacial Engineering†

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Construction of Hierarchical 2D PANI/Ni₃S₂ Nanosheet Arrays on Ni Foam for High‐Performance Asymmetric Supercapacitors

Boosting pH‐Universal Hydrogen Evolution of Molybdenum Disulfide Particles by Interfacial Engineering^†