Co/CoP Heterojunction on Hierarchically Ordered Porous Carbon as a Highly Efficient Electrocatalyst for Hydrogen and Oxygen Evolution

Li, Wei; Liu, Jing; Guo, Peifang; Li, Haozhe; Fei, Ben; Guo, Yanhui; Pan, Hongge; Sun, Dalin; Fang, Fang; Wu, Renbing

doi:10.1002/aenm.202102134

Cited by 170 publications

(115 citation statements)

References 52 publications

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“…As shown in Fig. 6c, the calculated DOS of Ag/δ-MnO 2 is higher than that of pure δ-MnO 2 at the Fermi level, indicating that the embedded Ag particles can elevate conductivity [54]. Moreover, the charge density difference (CDD) displays that Ag and δ-MnO 2 are surrounded with cyan and yellow regions, manifesting an electron transfer from Ag to δ-MnO 2 (Fig.…”

Section: Resultsmentioning

confidence: 90%

Reversible LiOH chemistry in Li-O2 batteries with free-standing Ag/δ-MnO2 nanoflower cathode

et al. 2022

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The low energy efficiency and poor cycle stability arising from the high aggressivity of discharge products toward organic electrolytes limit the practical applications of Li-O 2 batteries (LOBs). Compared with the typical discharge product Li 2 O 2 , LiOH shows better chemical and electrochemical stability. In this study, a free-standing cathode composed of hydrangea-like δ-MnO 2 with Ag nanoparticles (NPs) embedded in carbon paper (CP) (Ag/δ-MnO 2 @CP) is fabricated and used as the catalyst for the reversible formation and decomposition of LiOH. The possible discharge mechanism is investigated by in situ Raman measurement and density functional theory calculation. Results confirm that δ-MnO 2 dominantly catalyzes the conversion reaction of discharge intermediate LiO 2* to LiOH and that Ag particles promote its catalytic ability. In the presence of Ag/δ-MnO 2 @ CP cathode, the LOB exhibits enhanced specific capacity and a high discharge voltage plateau under humid O 2 atmosphere. At a current density of 200 mA g −1 , the LOB with the Ag/δ-MnO 2 @CP cathode presents an overpotential of 0.5 V and an ultra-long cycle life of 867 cycles with a limited specific capacity of 500 mA h g −1 . This work provides a fresh view on the role of solid catalysts in LOBs and promotes the development of LOBs based on LiOH discharge product for practical applications.

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Section: Resultsmentioning

confidence: 90%

Reversible LiOH chemistry in Li-O2 batteries with free-standing Ag/δ-MnO2 nanoflower cathode

et al. 2022

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“…Notably, such an appropriate BET surface area would be conducive to the exposure of active sites, while ordered macropores and mesopores are believed to provide accessible channels for the release of oxygen molecules to the active sites, thus promoting mass transfer. [15,16] The wettability of Fe 0.5 Co@HOMNCP and Fe 0.5 Co@NCP were studied using contact angle measurements. As shown in Figure S6, Supporting Information, the contact angle of Fe 0.5 Co@HOMNCP was less than 10° and the water droplets spread completely on the surface, indicating its superhydrophilic property.…”

Section: Resultsmentioning

confidence: 99%

Alloying Co Species into Ordered and Interconnected Macroporous Carbon Polyhedra for Efficient Oxygen Reduction Reaction in Rechargeable Zinc–Air Batteries

Liu

et al. 2022

Advanced Materials

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overall energy conversion efficiency of these devices. Currently, noble Pt-based materials are regarded as state-of-the-art electrocatalysts for the sluggish ORR. [6][7][8][9] Unfortunately, the scarcity, high cost, and poor stability hamper their commercial application. Tremendous effort has accordingly been devoted to exploring highly efficient and low-cost alternatives to Pt-based electrocatalysts. Among the various candidates, earth-abundant transition metal (TM)-based species embedded within nitrogen-doped carbonaceous support to form hybrid composites (TM@N-C) have received increasing attention owing to their unique electronic structure and synergistic effect.To rationally design TM@N-C electrocatalysts for the ORR, modulating the electronic structure or optimizing the geometric structure have been adopted to boost the catalytic process. The former strategy mainly involves heteroatom doping or alloying TM species to reduce the kinetic energy barriers and thus improve intrinsic activity while the latter strategy concentrates on the construction of the desired morphology and pore structure of the electrocatalyst to increase the accessible surface areas, ensure rapid mass transport to all accessible active sites, and provide structural protection. For example, Fu et al. synthesized an electrocatalyst consisting of NiCo alloy nanoparticles anchored on porous fibrous carbon (PFC) aerogels via Engineering non-precious transition metal (TM)-based electrocatalysts to simultaneously achieve an optimal intrinsic activity, high density of active sites, and rapid mass transfer ability for the oxygen reduction reaction (ORR) remains a significant challenge. To address this challenge, a hybrid composite consisting of Fe x Co alloy nanoparticles uniformly implanted into hierarchically ordered macro-/meso-/microporous N-doped carbon polyhedra (HOMNCP) is rationally designed. The combined results of experimental and theoretical investigations indicate that the alloying of Co enables a favorable electronic structure for the formation of the *OH intermediate, while the periodically trimodal-porous structured carbon matrix structure not only provides highly accessible channels for active site utilization but also dramatically facilitates mass transfer in the catalytic process. As expected, the Fe 0.5 Co@HOMNCP composite catalyst exhibits extraordinary ORR activity with a half-wave potential of 0.903 V (vs reversible hydrogen electrode), surpassing most Co-based catalysts reported to date. More remarkably, the use of the Fe 0.5 Co@HOMNCP catalyst as the air electrode in a zinc-air battery results in superior open-circuit voltage and power density compared to a commercial Pt/C + IrO 2 catalyst. The results of this study are expected to inspire the development of advanced TMbased catalysts for energy storage and conversion applications.

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“…3D‐ordered porous structures with unique surface features maximize the exposed surface sites, permit the intermediate interaction with core active sites, endorse the electrolyte penetration to decrease the ion diffusion and electron transfer path, and pledge the fast mass transfer kinetics. [ 87 ]…”

Section: Rational Design Of Anode Materials For Seawater Oxidationmentioning

confidence: 99%

Strategies of Anode Design for Seawater Electrolysis: Recent Development and Future Perspective

Haq

Haik

2022

Small Science

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Compared with freshwater splitting, seawater electrolysis has more spaces to be explored, which is primarily attributed to the additional critical catalytic challenges of the competition between anodic oxygen evolution reaction (OER) and chlorine chemistry, deep corrosion, and site blocking due to the presence of chloride ions and insoluble particulate in seawater. However, if direct seawater electrolysis can be realized, it would revolutionize the energy and environmental sectors. In this review, the current effective strategies are summarized, including electronic modulation, oxygen vacancies creation, amorphous and porous structure design, corrosion-resistant passive layer decoration, and creating strong catalyst-support interactions. The review also provides insights for seawater electrolysis on rational design of the OER catalyst with high selectivity, activity, corrosion resistance, chemical, and mechanical durability. Beyond the progress made to date, a perspective in the fabrication of high-performance anodes for direct seawater electrolysis is also proposed. Collectively, this review will shed light on the rational design of a viable anode for massive and sustainable hydrogen fuel production from immense seawater.

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Co/CoP Heterojunction on Hierarchically Ordered Porous Carbon as a Highly Efficient Electrocatalyst for Hydrogen and Oxygen Evolution

Abstract: Research data are not shared.

Cited by 170 publications

References 52 publications

Reversible LiOH chemistry in Li-O2 batteries with free-standing Ag/δ-MnO2 nanoflower cathode

Reversible LiOH chemistry in Li-O2 batteries with free-standing Ag/δ-MnO2 nanoflower cathode

Alloying Co Species into Ordered and Interconnected Macroporous Carbon Polyhedra for Efficient Oxygen Reduction Reaction in Rechargeable Zinc–Air Batteries

Strategies of Anode Design for Seawater Electrolysis: Recent Development and Future Perspective

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