Rational Design of Manganese Cobalt Phosphide with Yolk–Shell Structure for Overall Water Splitting

Tang, Guisheng; Zeng, Ye; Wei, Baodian; Liang, Hanfeng; Wu, Jiangtao; Yao, Ping; Wang, Zhoucheng

doi:10.1002/ente.201900066

Cited by 15 publications

(11 citation statements)

References 46 publications

(57 reference statements)

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“…39,45 The broad peak at 134.0 eV is due to the oxidized P species. 46 The peaks at 778.2 and 129.1 eV for Co and P are consistent with the binding energy (BE) of the Co− P bond in CoP. 45,47 The P 2p 1/2 located at 130.3 eV is slightly negatively shifted compared to the BE of P 2p 1/2 (130.4) eV in CoP, which might be ascribed to Mn doping.…”

Section: ■ Results and Discussionsupporting

confidence: 54%

“…In the Co 2p 3/2 region, two peaks assigned to Co 0 and Co 2+ can be observed at 778.2 and 781.4 eV, respectively. , The peak as appeared at 787.3 eV accounts for cobalt oxide or surface oxidized cobalt . In the Co 2p 1/2 region, other two peaks ascribed to Co 0 and Co 2+ appeared at 791.5 and 797.0 eV, respectively. , The peak at 803.1 eV is a usually observed “satellite” peak in CoP. , For P 2p spectrum (Figure d), the peaks at 129.1 and 130.3 eV are attributed to P 2p 3/2 and P 2p 1/2 , respectively, which are assigned to the metal phosphides formed from reduced phosphorus. , The broad peak at 134.0 eV is due to the oxidized P species . The peaks at 778.2 and 129.1 eV for Co and P are consistent with the binding energy (BE) of the Co–P bond in CoP. , The P 2p 1/2 located at 130.3 eV is slightly negatively shifted compared to the BE of P 2p 1/2 (130.4) eV in CoP, which might be ascribed to Mn doping …”

Section: Resultsmentioning

confidence: 90%

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Facile Electrodeposition of Mn-CoP Nanosheets on Ni Foam as High-Rate and Ultrastable Electrodes for Supercapacitors

Zhang

Wei

et al. 2021

ACS Appl. Energy Mater.

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As the combined merits of structures and compositions could have a great impact on electrodes, we synthesized manganese-doped cobalt phosphide nanosheets on Ni foam (Mn-CoP/NF) via a facile electrodeposition method. The synergistic effect between Mn and Co ions provides mixed valence states and adjusts the bandgap for accelerating the high redox reaction kinetics and improving the electron mobility and electrical conductivity. Meanwhile, the nanosheet structure provides rich electroactive sites and excellent structural stability for facilitating the electron transfer and resisting structural damage. As expected, the obtained Mn-CoP/NF electrode acquired a superior specific capacity (456 C g–1 at 0.5 A g–1), an excellent rate performance (77.4% capacity retention at 10 A g–1), and an excellent cyclability (89.0% capacity retention after 20,000 cycles). The Mn-CoP/NF//AC asymmetric supercapacitor (ASC) delivers a high energy density (14.82 W h kg–1 at 312 W kg–1) and long-term durability (87.7% capacity retention after 20,000 cycles). Moreover, two ASC devices can be used to light an LED for 6 min, demonstrating ASC’s promising practical applications.

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Section: ■ Results and Discussionsupporting

confidence: 54%

Section: Resultsmentioning

confidence: 90%

Facile Electrodeposition of Mn-CoP Nanosheets on Ni Foam as High-Rate and Ultrastable Electrodes for Supercapacitors

Zhang

Wei

et al. 2021

ACS Appl. Energy Mater.

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“…The pre-catalysts consisting of etchable species, such as metal-organic frameworks (MOFs), [117] metal phosphide, [118] and molybdate, [119] could easier undergo complete reconstruction under certain reaction conditions. For example, Huang et al revealed the real active species for superior OER activity in the hybrid Ni-MOF@Fe-MOF.…”

Section: Deep Reconstructionmentioning

confidence: 99%

Surface Reconstruction of Water Splitting Electrocatalysts

Zeng

Zhao

Huang

et al. 2022

Advanced Energy Materials

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183

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Gibbs free energy (ΔG) of water splitting reaction is 237.2 kJ mol −1 , corresponding to a theoretical voltage of 1.23 V. [3] However, the existence of electrochemical/concentration polarization and solution resistance can increase the actual voltage of water electrolysis to much beyond 1.23 V. Particularly, the OER involves a complicated four-electron transfer process, which results in a sluggish kinetics thus has long been the bottleneck. [4] Therefore, it is necessary to explore efficient and robust electrocatalysts to reduce the overpotential of water electrolysis and the extra electric energy consumption. Although noble electrocatalysts, such as Pt, RuO 2 and IrO 2 , are recognized as the most efficient electrocatalysts for water electrolysis, their high scarcity and instability severely impede large-scale applications. [5] Recently, considerable effort has been focused on nonnoble transition-metal materials as viable alternatives for water splitting. Understanding the intrinsic catalytic mechanism and real active sites of these catalysts will benefit the rational design and application of high-efficiency catalysts.With the development of in situ characterization technologies, more reports have revealed that the original electrocatalyst (so-called "pre-catalyst") surface sites would undergo dynamic reconstruction and transform into real reactive species. [6] This in situ reconstruction process could tune the electrocatalytic behaviors such as adsorption, activation, and desorption, thus improving the catalytic performance. [7] On this basis, many researchers utilized the pre-reconstruction of electrocatalysts to obtain a large number of active species for the catalytic reactions. [8] It has been found that the intrinsic properties of the pre-catalysts, such as composition, atomic arrangement, porosity, and crystallinity, would affect the reconstruction rate, reconstruction degree, and catalytic activity of the reconstructed species. [9] Moreover, the reaction conditions also affect the reconstruction process, such as electrochemical operation, applied potential, electrolyte concentration, and pH. [6a] Therefore, tuning the reconstruction process to generate abundant active sites with high intrinsic activity is an effective strategy to boost the catalytic performance of electrocatalysts.Although some influential review articles on the reconstruction of catalysts during water electrolysis have emerged, [10] most of them focus on the discovery and characterization of the reconstruction phenomenon, less on the regulation of the reconstruction process. In addition, reconstructed catalysts for Water electrolysis is regarded as an efficient and green method to produce hydrogen gas, a clean energy carrier that holds the key to solving global energy problems. So far, the efficiency and large-scale application of water electrolysis are restricted by the electrocatalytic activity of applied catalysts. Recently, the reconstruction phenomenon of electrocatalysts during a catalytic reaction has been discovered, which ...

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“…Also, there are many environmental concerns including air pollution and global warming caused by combustion. 3,4 Thus, nding sustainable energy sources to replace fossil fuels is vital.…”

Section: Introductionmentioning

confidence: 99%

Nickel sulfide and phosphide electrocatalysts for hydrogen evolution reaction: challenges and future perspectives

2022

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Rational Design of Manganese Cobalt Phosphide with Yolk–Shell Structure for Overall Water Splitting

Cited by 15 publications

References 46 publications

Facile Electrodeposition of Mn-CoP Nanosheets on Ni Foam as High-Rate and Ultrastable Electrodes for Supercapacitors

Facile Electrodeposition of Mn-CoP Nanosheets on Ni Foam as High-Rate and Ultrastable Electrodes for Supercapacitors

Surface Reconstruction of Water Splitting Electrocatalysts

Nickel sulfide and phosphide electrocatalysts for hydrogen evolution reaction: challenges and future perspectives

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