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Journal ArticleDOI: 10.1039/D0NR08108F

CoP2/Fe-CoP2 yolk-shell nanoboxes as efficient electrocatalysts for the oxygen evolution reaction.

04 Mar 2021-Nanoscale (Royal Society of Chemistry (RSC))-Vol. 13, Iss: 8, pp 4569-4575
Abstract: The development of an efficient electrocatalyst is an important requirement for water splitting systems to produce clean and sustainable hydrogen fuel Herein, we synthesized CoP2/Fe-CoP2 yolk–shell nanoboxes (YSBs) as efficient electrocatalysts for the oxygen evolution reaction (OER) Initially, zeolitic imidazolate framework-67/CoFe-Prussian blue analogue (ZIF-67/CoFe-PBA) YSBs were prepared by the reaction of ZIF-67 and [Fe(CN)6]3− ions in the presence of a small amount of water as an etching agent The size of the CoP2 yolk depends on the amount of water The heteronanostructure composed of the CoP2 yolk and the FexCo1−xP2 shell with a cubic shape was obtained by phosphidation of ZIF-67/CoFe-PBA YSBs Benefiting from the unique structure and chemical composition, the CoP2/Fe-CoP2 YSB electrocatalyst has a large specific surface area of 114 m2 g−1 and shows superior electrocatalytic performances for the OER such as a low overpotential of 266 mV, a small Tafel slope value of 681 mV dec−1, and excellent cyclic stability

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Topics: Electrocatalyst (57%), Water splitting (55%), Overpotential (54%) ... read more
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6 results found


Journal ArticleDOI: 10.1016/J.NANTOD.2021.101245
Xudong Zhao1, Xianglong Kong1, Zhiliang Liu1, Zhi Li1  +7 moreInstitutions (4)
01 Oct 2021-Nano Today
Abstract: The development of cost-efficient and high-performance electrochemical materials is very important to promote clean energy storage and conversion. Very recently, the phosphorus-rich (P-rich) metal phosphides (MPs) emerge as the cutting-edge materials in energy storage and conversion due to their significant advantages for lithium ion batteries (LIBs), sodium ion batteries (SIBs), hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and solar cells (SCs). This review summarizes the up-to-date advances of P-rich MPs in energy storage and conversion from typical structures, main synthetic methods and diversified advanced applications. The corresponding electrochemical reaction mechanism, composition/structure designs and desired performance of P-rich MPs are conjointly discussed to deliver an insightful perspective of the theory-composition/structure-performance relationships and reveal the reasons behind the excellent electrochemical performance. At last, several potential challenges and inspiring outlooks are highlighted to serve guidance for the future research and applications of P-rich MPs.

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Topics: Energy storage (54%)

8 Citations


Open accessJournal ArticleDOI: 10.3390/CATAL11040429
27 Mar 2021-Catalysts
Abstract: Of all the available resources given to mankind, the sunlight is perhaps the most abundant renewable energy resource, providing more than enough energy on earth to satisfy all the needs of humanity for several hundred years. Therefore, it is transient and sporadic that poses issues with how the energy can be harvested and processed when the sun does not shine. Scientists assume that electro/photoelectrochemical devices used for water splitting into hydrogen and oxygen may have one solution to solve this hindrance. Water electrolysis-generated hydrogen is an optimal energy carrier to store these forms of energy on scalable levels because the energy density is high, and no air pollution or toxic gas is released into the environment after combustion. However, in order to adopt these devices for readily use, they have to be low-cost for manufacturing and operation. It is thus crucial to develop electrocatalysts for water splitting based on low-cost and land-rich elements. In this review, I will summarize current advances in the synthesis of low-cost earth-abundant electrocatalysts for overall water splitting, with a particular focus on how to be linked with photoelectrocatalytic water splitting devices. The major obstacles that persist in designing these devices. The potential future developments in the production of efficient electrocatalysts for water electrolysis are also described.

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Topics: Energy carrier (54%), Water splitting (53%)

2 Citations


Journal ArticleDOI: 10.1039/D1DT02127C
Lei Ye1, Yeqing Zhang1, Meilin Zhang1, Yaqiong Gong2  +1 moreInstitutions (2)
Abstract: To overcome the problem of the sluggish kinetics of the oxygen evolution reaction (OER), it is of great significance to develop an efficient and stable non-noble metal-based OER catalyst for electrocatalytic energy conversion and storage. Herein, a complex of a metal-organic framework and hydroxide is synthesized by performing a ligand etching strategy on FeMn co-doped Ni(OH)2 nanosheets in situ grown on nickel foam (FeMn-Ni(OH)2@MOF/NF). Benefiting from the unique sheet-on-sheet hierarchical structure, multi-metal active nodes and two active materials grown in situ, the resulting FeMn-Ni(OH)2@MOF/NF demonstrated brilliant OER activity with an overpotential of 199 mV to achieve a current density of 10 mA cm-2 and long-term stability. This research will provide a new strategy for the design of high-performance OER electrocatalysts.

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Topics: Electrocatalyst (54%), Overpotential (54%), Oxygen evolution (51%)

1 Citations


Journal ArticleDOI: 10.1039/D1NR01669E
Hui Wen1, Zhang Shengqi1, Yu Tao1, Ziyu Yi1  +2 moreInstitutions (2)
22 Jul 2021-Nanoscale
Abstract: As a new type of crystalline porous material, the imidazole zeolite framework (ZIF) has attracted widespread attention due to its ultra-high surface area, large pore volume, and unique advantage of easy functionalization. Developing different methods to control the shape and composition of ZIF is very important for its practical application as catalyst. In recent years, nano-ZIF has been considered an electrode material with excellent oxygen evolution reaction (OER) performance, which provides a new way to research electrolyzed water. This review focuses on the morphological engineering of the original ZIF-67 and its derivatives (core-shell, hollow, and array structures) through doping (cation doping, anion doping, and co-doping), derivative composition engineering (metal oxide, phosphide, sulfide, selenide, and telluride), and the corresponding single-atom catalysis. Besides, combined with DFT calculations, it emphasizes the in-depth understanding of actual active sites and provides insights into the internal mechanism of enhancing the OER and proposes the challenges and prospects of ZIF-67 based electrocatalysts. We summarize the application of ZIF-67 and its derivatives in the OER for the first time, which has significantly guided research in this field.

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Journal ArticleDOI: 10.1021/ACSAEM.1C02634
27 Oct 2021-
Abstract: Rational design and construction of hollow structured hybrid electrocatalysts are impressive for efficient and sustainable water splitting process. This study emphasizes a MOF-based self-templating...

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Topics: Water splitting (52%)

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51 results found


Journal ArticleDOI: 10.1039/C6CS00328A
Nian Tzu Suen1, Sung Fu Hung1, Quan Quan2, Nan Zhang2  +2 moreInstitutions (2)
Abstract: There is still an ongoing effort to search for sustainable, clean and highly efficient energy generation to satisfy the energy needs of modern society. Among various advanced technologies, electrocatalysis for the oxygen evolution reaction (OER) plays a key role and numerous new electrocatalysts have been developed to improve the efficiency of gas evolution. Along the way, enormous effort has been devoted to finding high-performance electrocatalysts, which has also stimulated the invention of new techniques to investigate the properties of materials or the fundamental mechanism of the OER. This accumulated knowledge not only establishes the foundation of the mechanism of the OER, but also points out the important criteria for a good electrocatalyst based on a variety of studies. Even though it may be difficult to include all cases, the aim of this review is to inspect the current progress and offer a comprehensive insight toward the OER. This review begins with examining the theoretical principles of electrode kinetics and some measurement criteria for achieving a fair evaluation among the catalysts. The second part of this review acquaints some materials for performing OER activity, in which the metal oxide materials build the basis of OER mechanism while non-oxide materials exhibit greatly promising performance toward overall water-splitting. Attention of this review is also paid to in situ approaches to electrocatalytic behavior during OER, and this information is crucial and can provide efficient strategies to design perfect electrocatalysts for OER. Finally, the OER mechanism from the perspective of both recent experimental and theoretical investigations is discussed, as well as probable strategies for improving OER performance with regards to future developments.

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2,608 Citations


Journal ArticleDOI: 10.1021/JZ2016507
Youngmin Lee1, Jin Suntivich1, Kevin J. May1, Erin E. Perry1  +1 moreInstitutions (1)
Abstract: The activities of the oxygen evolution reaction (OER) on iridium-oxide- and ruthenium-oxide-based catalysts are among the highest known to date. However, the OER activities of thermodynamically stable rutile iridium oxide (r-IrO2) and rutile iridium oxide (r-RuO2), normalized to catalyst mass or true surface area are not well-defined. Here we report a synthesis of r-IrO2 and r-RuO2 nanoparticles (NPs) of ∼6 nm, and examine their OER activities in acid and alkaline solutions. Both r-IrO2 and r-RuO2 NPs were highly active for OER, with r-RuO2 exhibiting up to 10 A/goxide at 1.48 V versus reversible hydrogen electrode. When comparing the two, r-RuO2 NPs were found to have slightly higher intrinsic and mass OER activities than r-IrO2 in both acid and basic solutions. Interestingly, these oxide NPs showed higher stability under OER conditions than commercial Ru/C and Ir/C catalysts. Our study shows that these r-RuO2 and r-IrO2 NPs can serve as a benchmark in the development of active OER catalysts for electrol...

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2,219 Citations


Journal ArticleDOI: 10.1021/CS3003098
23 Jul 2012-ACS Catalysis
Abstract: A comparative investigation was performed to examine the intrinsic catalytic activity and durability of carbon supported Ru, Ir, and Pt nanoparticles and corresponding bulk materials for the electrocatalytic oxygen evolution reaction (OER). The electrochemical surface characteristics of nanoparticles and bulk materials were studied by surface-sensitive cyclic voltammetry. Although basically similar voltammetric features were observed for nanoparticles and bulk materials of each metal, some differences were uncovered highlighting the changes in oxidation chemistry. On the basis of the electrochemical results, we demonstrated that Ru nanoparticles show lower passivation potentials compared to bulk Ru material. Ir nanoparticles completely lost their voltammetric metallic features during the voltage cycling, in contrast to the corresponding bulk material. Finally, Pt nanoparticles show an increased oxophilic nature compared to bulk Pt. With regard to the OER performance, the most pronounced effects of nanosca...

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Topics: Cyclic voltammetry (51%), Oxygen evolution (51%)

1,433 Citations


Journal ArticleDOI: 10.1021/ACSCATAL.6B02479
02 Nov 2016-ACS Catalysis
Abstract: Increasing demand for finding eco-friendly and everlasting energy sources is now totally depending on fuel cell technology. Though it is an eco-friendly way of producing energy for the urgent requirements, it needs to be improved to make it cheaper and more eco-friendly. Although there are several types of fuel cells, the hydrogen (H2) and oxygen (O2) fuel cell is the one with zero carbon emission and water as the only byproduct. However, supplying fuels in the purest form (at least the H2) is essential to ensure higher life cycles and less decay in cell efficiency. The current large-scale H2 production is largely dependent on steam reforming of fossil fuels, which generates CO2 along with H2 and the source of which is going to be depleted. As an alternate, electrolysis of water has been given greater attention than the steam reforming. The reasons are as follows: the very high purity of the H2 produced, the abundant source, no need for high-temperature, high-pressure reactors, and so on. In earlier days,...

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Topics: Steam reforming (62%), Photoelectrolysis (57%), Energy source (56%) ... read more

1,238 Citations


Open accessJournal ArticleDOI: 10.1038/NCOMMS8241
Abstract: Nature Communications 6: Article number: 6081 (2015); Published 20 January 2015; Updated 3 June 2015. In Fig. 4c of this Article, the y axis values were wrongly given as 0, 20, 40, 60 and 80 in the middle and the lower panels. The correct values should read 0, 10, 20, 30 and 40 for the middle and 0,1, 2, 3 and 4 for the lower panels.

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1,027 Citations