Multi-shelled CoS2–MoS2 hollow spheres as efficient bifunctional electrocatalysts for overall water splitting

Ganesan, Vinoth; Kim, Jinkwon

doi:10.1016/j.ijhydene.2020.03.045

Cited by 61 publications

(19 citation statements)

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“…The HR Co 2p spectrum of H‐CoS x @NiFe LDH/NF ( Figure a) may be divided into multiple peaks corresponding to Co 3+ (780.9 and 796.8 eV), Co 2+ (783.0 and 798.7 eV) and satellite peaks (786.9 and 802.5 eV, annotated as Sat.). [ 40 ] As for the Ni 2p spectrum of H‐CoS x @NiFe LDH/NF (Figure 3b), two major peaks located at 855.9 and 873.7 eV were observed, which correspond to Ni 2p 3/2 and Ni 2p 1/2 , respectively, and satellite peaks were also found at 861.7 and 879.7 eV, respectively. [ 41 ] In the HR Fe 2p spectrum of H‐CoS x @NiFe LDH/NF (Figure 3c), the Fe 2p 3/2 (712.6 eV), Fe 2p 1/2 (725.2 eV), and satellite peaks (718.6 and 733.4 eV) were observed, which are the characteristic peaks associated with Fe‐based materials.…”

Section: Resultsmentioning

confidence: 99%

Metal–Organic Framework‐Derived Hollow CoS_x Nanoarray Coupled with NiFe Layered Double Hydroxides as Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Lee

Kang

2022

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106

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First-row transition metal-based catalysts, such as metal oxides, sulfides, selenides, phosphides, and hydroxides of Co, Ni, Fe, and Mo have been studied intensively owing to high intrinsic activities and low cost. [9,10] However, most of the reported catalysts exhibited satisfactory activity and stability toward either HER or OER, which complicates the configuration of an integrated electrolyzer. [11] To simplify the system and reduce the overall cost for industrial applications, a transition metalbased bifunctional electrocatalyst that can catalyze both the HER and OER process is essential.Ni-Fe based layered double hydroxides (NiFe LDHs) are considered to be competitive OER catalyst candidates in alkaline media. [12,13] In contrast, the catalytic performance of NiFe LDHs in HER is unsatisfactory owing to the sluggish HER kinetics resulting from a large energy barrier for the Volmer step. [14,15] Additionally, NiFe LDHs suffer from the inherent problems associated with LDH-based catalysts, such as poor stability caused by self-aggregation and a low electrochemically-active surface area. [16,17] Therefore, the design of NiFe-based LDHs, with improved HER catalytic properties and maintained OER performance, to serve as effective bifunctional catalysts for electrolysis of water is an important challenge. In this regard, the controlled integration of NiFe LDHs and HERactive catalysts into a hetero-nanostructure may be a reasonable strategy to fabricate highly efficient bifunctional catalysts for water splitting. [18] Because of their high surface area and open structure, hollow-structured HER catalysts are believed to be ideal templates for NiFe LDH growth. [19,20] Previous studies have confirmed that growing LDHs on hollow-structured HER catalysts can increase the electrochemically-active surface area and inhibit self-aggregation of LDHs. [21] Recently, metal-organic frameworks (MOFs) have been considered as efficient precursors for fabricating porous and/ or hollow-structured materials based on their tunable physicochemical properties. [22,23] Consequently, numerous research groups have attempted to develop MOF-derived hollow-structured materials as highly efficient electrocatalysts for the HER process. [24,25] For example, Wang et al. fabricated a Ni-Co bimetallic sulfide catalyst with a multi-shell hollow structure (derived from the MOF component of the catalyst) for enhanced HER For effective hydrogen production by water splitting, it is essential to develop earth-abundant, highly efficient, and durable electrocatalysts. Herein, the authors report a bifunctional electrocatalyst composed of hollow CoS x and Ni-Fe based layered double hydroxide (NiFe LDH) nanosheets for efficient overall water splitting (OWS). The optimized heterostructure is obtained by the electrodeposition of NiFe LDH nanosheets on metal-organic framework-derived hollow CoS x nanoarrays, which are supported on nickel foam (H-CoS x @NiFe LDH/NF). The unique structure of the hybrid material not only provides ample active sites, but also facilit...

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Section: Resultsmentioning

confidence: 99%

Metal–Organic Framework‐Derived Hollow CoS_x Nanoarray Coupled with NiFe Layered Double Hydroxides as Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Lee

Kang

2022

Small

106

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“…39 There are two spin−orbit doublets appearing at 782.8 and 785.9 eV, which are the characteristic of Co 3+ and Co 2+ , respectively. 40 The high-resolution Mo 3d spectra are shown in Figure 3c. For the pristine MoS 2 /CC sample, the two peaks at 229.0 and 232.5 eV are consistent with Mo 4+ 3d 5/2 and Mo 4+ 3d 3/2 , respectively, and the peak at 226.0 eV belongs to S 2s.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Universal Strategy of Bimetal Heterostructures as Superior Bifunctional Catalysts for Electrochemical Water Splitting

Sun

Tong

Chen

et al. 2021

ACS Sustainable Chem. Eng.

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Utilizing earth-abundant metals to design economical and efficient electrocatalysts for cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) is critical for acquiring clean hydrogen energy by the electrochemical overall water-splitting system. In this work, we reported a facile and universal strategy toward developing a suite of bimetallic heterostructures, representing as highly efficient catalysts of the HER/OER process. By hybridizing transition-metal sulfides (CoS 2 , NiS 2 , FeS 2 , and CuS) with highly active MoS 2 nanosheets, all heterostructural catalysts achieved largely improved bifunctional activity originating from the special interfacial interaction as well as synergetic catalytic effects. As a result, the optimal CoS 2 @MoS 2 /CC and NiS 2 @MoS 2 /CC heterostructures displayed the lowest overpotentials at 10 mA cm −2 , which only required 31 and 225 mV for HER/OER, respectively. After assembling for water splitting, the electrolyzer exhibited a very small cell voltage of 1.58 V to reach 10 mA cm −2 . This result is obviously better than a lot of reported non-precious metal catalysts. Our strategy experimentally confirms the feasibility of the heterostructure to enhance the bifunctional performance of advanced electrocatalysts for electrochemical water splitting.

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“…The latter depends heavily on the dimensions, geometry, and structure of the electrocatalyst. The morphology of the catalyst such as spheres, 78 nanosheet, 79 nanorods, 80 nanowires, 81 and nanoboxes 82 plays a significant role in increasing the number of active sites to enhance its electrocatalytic performances. Compared with zero-, one-, and two-dimensional structures, the three-dimensional porous architecture can provide highly desirable properties and is propitious to improve the OER catalytic performance considering that it can offer a large surface area, create numerous fast channels for mass transfer and ion diffusion, and increase the active sites.…”

Section: Structure Optimizationmentioning

confidence: 99%

Intrinsic activity modulation and structural design of NiFe alloy catalysts for an efficient oxygen evolution reaction

et al. 2021

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Multi-shelled CoS2–MoS2 hollow spheres as efficient bifunctional electrocatalysts for overall water splitting

Cited by 61 publications

References 50 publications

Metal–Organic Framework‐Derived Hollow CoS_x Nanoarray Coupled with NiFe Layered Double Hydroxides as Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Metal–Organic Framework‐Derived Hollow CoS_x Nanoarray Coupled with NiFe Layered Double Hydroxides as Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Universal Strategy of Bimetal Heterostructures as Superior Bifunctional Catalysts for Electrochemical Water Splitting

Intrinsic activity modulation and structural design of NiFe alloy catalysts for an efficient oxygen evolution reaction

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Multi-shelled CoS2–MoS2 hollow spheres as efficient bifunctional electrocatalysts for overall water splitting

Cited by 61 publications

References 50 publications

Metal–Organic Framework‐Derived Hollow CoSx Nanoarray Coupled with NiFe Layered Double Hydroxides as Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Metal–Organic Framework‐Derived Hollow CoSx Nanoarray Coupled with NiFe Layered Double Hydroxides as Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Universal Strategy of Bimetal Heterostructures as Superior Bifunctional Catalysts for Electrochemical Water Splitting

Intrinsic activity modulation and structural design of NiFe alloy catalysts for an efficient oxygen evolution reaction

Contact Info

Product

Resources

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Metal–Organic Framework‐Derived Hollow CoS_x Nanoarray Coupled with NiFe Layered Double Hydroxides as Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Metal–Organic Framework‐Derived Hollow CoS_x Nanoarray Coupled with NiFe Layered Double Hydroxides as Efficient Bifunctional Electrocatalyst for Overall Water Splitting