Amorphous Co<sub>2</sub>B Grown on CoSe<sub>2</sub> Nanosheets as a Hybrid Catalyst for Efficient Overall Water Splitting in Alkaline Medium

Guo, Yaxiao; Yao, Zhaoyang; Shang, Changshuai; Wang, Erkang

doi:10.1021/acsami.7b10605

Cited by 97 publications

(54 citation statements)

References 44 publications

(84 reference statements)

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“…[27,31] Additionally,F igure 5f clearly shows that H 2 and O 2 bubbles were generated in large quantities on both the cathode and anode, which indicates that the catalysth as significant catalytic activity in overall water splitting in alkaline medium. To verify the effectiveness of CoS x Se 2(1Àx) as ab ifunctionale lectrocatalyst, aw ater electrolyzer was assembled in alkaline solution.…”

Section: Resultsmentioning

confidence: 95%

Direct Growth of CNTs@CoS_xSe_2(1−x) on Carbon Cloth for Overall Water Splitting

Zhang

Qiu

et al. 2019

ChemSusChem

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Section: Resultsmentioning

confidence: 95%

Direct Growth of CNTs@CoS_xSe_2(1−x) on Carbon Cloth for Overall Water Splitting

Zhang

Qiu

et al. 2019

ChemSusChem

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“…Highly efficient water electrolysis generally requires high-performance electrocatalysts with low overpotential, fast kinetics, and high stability. [9][10][11] Recently, transition-metal hydroxides, [7,12] phosphides, [8,[13][14][15][16] nitrides, [17,18] and chalcogenides [19][20][21][22] have been investigated as promising candidates for bifunctional electrocatalysts. [7,8] The search for earth-abundant, lowcost HER and OER electrocatalysts that are robust, have high activity and stability has triggered numerous efforts to replace noble metal-based materials.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11] Recently, transition-metal hydroxides, [7,12] phosphides, [8,[13][14][15][16] nitrides, [17,18] and chalcogenides [19][20][21][22] have been investigated as promising candidates for bifunctional electrocatalysts. [9,12,17,19,22,34] However, the high surface energy of sheets, which are unstable, leads to the possibility of stacking with surrounding sheets through van der Waals attractions, resulting in a decrease of the active surface area. [23][24][25][26] In addition, according to recent reports, these compounds can operate as highly efficient OER electrocatalysts and could thus be utilized as bifunctional electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

3D Architectures of Quaternary Co‐Ni‐S‐P/Graphene Hybrids as Highly Active and Stable Bifunctional Electrocatalysts for Overall Water Splitting

Song

Yoon

et al. 2018

Advanced Energy Materials

110

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Developing low-cost, highly active, and stable bifunctional electrocatalysts is a challenging issue in electrochemical water electrolysis. Building on 3D architectured electrocatalysts through structural and compositional engineering is an effective strategy to enhance catalytic activities as well as stability and durability. Herein, 3D architectures of quaternary Co-Ni-S-P compounds coupled with graphene ((Co 1−x Ni x )(S 1−y P y ) 2 /G) electrocatalysts are proposed, in which nanosheets are self-assembled to form 3D architectures with round and flat doughnut-like shapes, toward overall water splitting. Benefiting from the 3D architectures and Ni, P substitution, (Co 1−x Ni x )(S 1−y P y ) 2 /G exhibits superior electrocatalytic activities with low overpotentials of 117 and 285 mV at 10 mA cm −2 and Tafel slopes of 85 and 105 mV dec −1 for hydrogen and oxygen evolution reactions, respectively, in alkaline media. In addition, minimal increases in overpotential are observed, even after the 10 000th voltammetric cycle and continuous chronopotentiometric testing over 50-100 h, confirming the high stability and durability of (Co 1−x Ni x )(S 1−y P y ) 2 /G. When used as both cathode and anode, (Co 1−x Ni x )(S 1−y P y ) 2 /G achieves excellent overall water splitting performance with a cell potential as low as 1.65 V, reaching a current density of 10 mA cm −2 with no obvious decay after 50 h, demonstrating that (Co 1−x Ni x )(S 1−y P y ) 2 /G is an efficient bifunctional electrocatalyst for overall water splitting.

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“…The XRD patterns of the prepared corresponding NiSe 2 , CoSe 2 , and Ni x Co 1−x Se 2 are shown in Figure 3. [46,47] The Ni x Co 1−x Se 2 with different Co/Ni molar ratios show similar XRD diffraction patterns. NiSe 2 and CoSe 2 were also successfully obtained according to the standard XRD patterns of NiSe 2 (JCPDS no.…”

Section: Introductionmentioning

confidence: 92%

Nickel–Cobalt Diselenide Nanosheets Supported on Copper Nanowire Arrays for Synergistic Electrocatalytic Oxygen Evolution

Chen

Ren

et al. 2019

Adv Materials Inter

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water splitting. [7] So the synthesis of efficient electrocatalysts with high OER kinetics remains a field of great interest. Currently, noble metal (Ru and Ir)-based compounds are the efficient catalysts toward OER with high current density and low overpotential. [8] However, their scarcity and high cost greatly hindered large-scale application. Therefore, developing earth-abundant and cheap catalysts is necessary to improve OER activity and realize electrochemical water splitting. In recent years, metal oxides have been widely studied as earth-abundant catalysts for the OER, but there exist some inherent limitations such as low conductivity and poor catalytic kinetics. [9] Currently, transition metal phosphides and chalcogenides have emerged as highly active catalysts for OER. [10,11] Compared to the corresponding oxide counterparts, their better performances originated from the higher conductivities. Among these catalysts, transition metal selenides have attracted much attention due to their low cost, intrinsic metallic properties, and high activity. [12] Recent studies showed that, in the process of electrocatalysis, the surface of metal selenides can be partially oxidized into metal oxides, which were proved to be the true catalytically active species. The synergistic effects of high conductivity of metal selenide and high catalytically active species (metal oxides) formed on the outer surface of metal selenides provided excellent electrocatalytic activity. [13,14] In transition metal-based OER catalysts, Co-based and Nibased catalysts have exhibited excellent OER property. [15][16][17][18][19] Especially bimetallic Co-Ni-based electrocatalysts have exhibited significantly enhanced OER activity than monometallic Cobased and Ni-based catalysts. [20][21][22][23][24] The enhanced OER activity of bimetallic electrocatalysts mainly came from the flexible variable valence state of bimetallic elements and more active sites which originated from atomic defects. For example, Tüysüz and co-workers reported that the prepared ordered mesoporous nickel cobalt oxide showed greatly improved OER activity compared with single Ni or Co metal oxide electrocatalyst. [25] Meanwhile, nickel-cobalt selenides also exhibited remarkable performance in fields of electrochemical energy production and storage. [26][27][28][29] For example, Xu et al. prepared (Ni, Co)Se 2 Rational nanoarchitecture design and smart hybridization of bespoke catalysts can greatly accelerate the sluggish kinetics of oxygen evolution reaction (OER) in electrochemical water splitting. Here, hierarchical Ni x Co 1−x Se 2 porous nanosheets are synthesized on Cu nanowire arrays (CNW) to fabricate highly efficient core/shell structure integrated OER electrode. Highly conductive CNW arrays are first obtained via the reduction of the pre-prepared CuO nanowire arrays. Ni x Co 1−x precursor nanosheets are then grown on CNW via hydrothermal route, and the following selenylation led to in situ formation of Ni x Co 1−x Se 2 porous nanosheet. In the integrated electrode, ...

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Amorphous Co₂B Grown on CoSe₂ Nanosheets as a Hybrid Catalyst for Efficient Overall Water Splitting in Alkaline Medium

Cited by 97 publications

References 44 publications

Direct Growth of CNTs@CoS_xSe_2(1−x) on Carbon Cloth for Overall Water Splitting

Direct Growth of CNTs@CoS_xSe_2(1−x) on Carbon Cloth for Overall Water Splitting

3D Architectures of Quaternary Co‐Ni‐S‐P/Graphene Hybrids as Highly Active and Stable Bifunctional Electrocatalysts for Overall Water Splitting

Nickel–Cobalt Diselenide Nanosheets Supported on Copper Nanowire Arrays for Synergistic Electrocatalytic Oxygen Evolution

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Amorphous Co2B Grown on CoSe2 Nanosheets as a Hybrid Catalyst for Efficient Overall Water Splitting in Alkaline Medium

Cited by 97 publications

References 44 publications

Direct Growth of CNTs@CoSxSe2(1−x) on Carbon Cloth for Overall Water Splitting

Direct Growth of CNTs@CoSxSe2(1−x) on Carbon Cloth for Overall Water Splitting

3D Architectures of Quaternary Co‐Ni‐S‐P/Graphene Hybrids as Highly Active and Stable Bifunctional Electrocatalysts for Overall Water Splitting

Nickel–Cobalt Diselenide Nanosheets Supported on Copper Nanowire Arrays for Synergistic Electrocatalytic Oxygen Evolution

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Amorphous Co₂B Grown on CoSe₂ Nanosheets as a Hybrid Catalyst for Efficient Overall Water Splitting in Alkaline Medium

Direct Growth of CNTs@CoS_xSe_2(1−x) on Carbon Cloth for Overall Water Splitting

Direct Growth of CNTs@CoS_xSe_2(1−x) on Carbon Cloth for Overall Water Splitting