Partially sulfurated ultrathin nickel-iron carbonate hydroxides nanosheet boosting the oxygen evolution reaction

Yang, Yang; Luan, Xuebin; Dai, Xiaoping; Zhang, Xin; Qiao, Hongyan; Zhao, Huihui; Yong, Jiaxi; Yu, Lei; Jiang, Hanqiao; Zhang, Jing

doi:10.1016/j.electacta.2019.04.091

Cited by 41 publications

(32 citation statements)

References 58 publications

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“…10 % with respect to Cu. The relative amount of sulfate with respect to the total amount of S significantly increased during OER operation, up to a 70 % of the total detected sulfur 42,66.…”

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confidence: 99%

In Situ Electrochemical Oxidation of Cu₂S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

et al. 2019

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The development of cost-effective oxygen evolution catalysts is of capital importance for the deployment of large scale energy storage systems based on metal-air batteries and reversible fuel cells. In this direction, a wide range of materials have been explored, especially in more favorable alkaline conditions, and several metal chalcogenides have particularly demonstrated excellent performances. However, chalcogenides are thermodynamically less stable than the corresponding oxides and hydroxides under oxidizing potentials in alkaline media. While this instability in some cases has prevented the application of chalcogenides as oxygen evolution catalysts, and it has been disregarded in some other, we propose to use it in our favor to produce high performance oxygen evolution catalysts. We characterize here the in situ chemical, structural and morphological transformation during the oxygen evolution reaction (OER) in alkaline media of Cu2S into CuO nanowires (NWs), mediating the intermediate formation of Cu(OH)2. We also test their OER activity and stability under OER operation in alkaline media, and compare them with the OER performance of Cu(OH)2 and CuO nanostructures directly grown on the surface of a copper mesh. We demonstrate here that CuO produced during OER from Cu 2 S displays an extraordinary electrocatalytic performance toward OER, well above that of CuO and Cu(OH)2 synthesized mediating no OER in situ transformation.3

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confidence: 99%

In Situ Electrochemical Oxidation of Cu₂S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

et al. 2019

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“…Figure b shows the FTIR spectra of NiCo-CH and NiCo-CHS. The peaks with high intensity at 3420–3500 cm –1 are attributed to the O–H stretching vibration of molecular water and the hydrogen-bonded O–H groups, − and the peak at 1629 cm –1 is due to the bending mode of water molecules. , The bands observed at 1500, 829, 754, and 693 cm –1 in these two spectra correspond well to the stretching vibration modes of ν(OCO 2 ), δ(CO 3 ), δ(OCO), and ρ(OCO), respectively. − Meanwhile, the shoulder vibration band present at 1382 cm –1 is also assigned to the carbonate anions. ,− The peaks existing at 1106 and 623 cm –1 in the spectrum for NiCo-CHS are attributed to the CoS and possible M–S stretching vibrations, respectively. ,, The band at 954 cm –1 in the spectra for both NiCo-CH and NiCo-CHS is ascribed to the δ(M–OH) bending modes, , while the band at 529 cm –1 could be assigned to ν(M–O) stretching vibrations …”

Section: Resultsmentioning

confidence: 98%

Neutral-Alkaline Hybrid Water Electrolysis at Less Than 1.43 V Enabled by a Branched NiCo-Hydroxysulfide Nanoarray

Zhu

Zhang

Wei

et al. 2021

ACS Sustainable Chem. Eng.

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In this study, a branched and amorphous NiCo-hydroxysulfide nanoarray uniformly coated on a carbon fiber cloth (NiCo-CHS NW/CC) is reported to serve as a Janus and efficient catalyst for alkaline overall water splitting with a low cell voltage of 1.64 V at 10 mA cm–2. The high activity of this catalyst can be attributed to the facilitated electrolyte penetration, promoted gas release, shortened ionic diffusion length, and abundant catalytic active sites enabled by a unique structure with a shaggy surface and an open space as well as the intrinsic high catalytic activity of NiCo-hydroxysulfide. Considering that neutral hydrogen evolution reaction (HER) is more thermodynamically favorable than alkaline HER due to the pH effect, a concept of neutral-alkaline hybrid water splitting enabled by the bifunctional NiCo-CHS NW/CC is further proposed. This hybrid water splitting system exhibits a much lower cell voltage (just 1.43 V at 10 mA cm–2) with a large energy-consumption decrease compared to the alkaline water splitting system.

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“…The OER mechanism in alkaline media is usually considered as the following processes: (1) M + OH → M–OH + e – ; (2) M–OH + OH → M–O + e – + H 2 O; (3) M–O + OH → M–OOH + e – ; (4) M–OOH + OH → M–O 2 + H 2 O + e – ; (5) M–O 2 → M + O 2 ; M in the equation refers to the active sites. , There are going to be various intermediates in the OER process, such as MOH, M–O, M–OOH, and M–O 2 . Finally, the O 2 + M (gas) are obtained, and the true activity sites in the reaction are metal oxide/hydr(oxy)oxides . The OER kinetics is related to the adsorption energy of OH – on the surface of the catalyst .…”

Section: Resultsmentioning

confidence: 99%

Promotion of the Electrocatalytic Oxygen Evolution Reaction by Chemical Coupling of CoOOH Particles to 3D Branched γ-MnOOH Rods

Cui

Zhao

Dai

et al. 2019

ACS Sustainable Chem. Eng.

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The chemical-coupled three-dimensional (3D) γ-MnOOH with CoOOH particles (γ-MnOOH/CoOOH) was fabricated through a two-step strategy involving a hydrothermal and reduction–oxidation process. The strong solid–solid interfacial interactions between γ-MnOOH rods and CoOOH particles feature the Mn–O–Co bond on the interface and a high valence state of cobalt in CoOOH. The branched γ-MnOOH/CoOOH composites demonstrate a significantly strengthened synergy effect for the oxygen evolution reaction (OER). The optimal B-MCO-0.1 (γ-MnOOH/CoOOH-0.1) shows an excellent OER performance, which requires an overpotential of 313 mV to reach the current density of 10 mA cm–2 with a lower Tafel slope (87 mV dec–1) and the strong durability in alkaline electrolyte. Specially, the intrinsic OER activity (versus electrochemical active surface area, ECSA) on B-MCO-0.1 at an overpotential of 420 mV is 16.3 and 8.9 times higher than those of γ-MnOOH and CoOOH, respectively. The results demonstrate that OER activity originates mainly from the interfacial coupling of γ-MnOOH and CoOOH. Our work highlights the vital function of the interfacial interactions in modulating the electronic structure of the active sites and suggests an effective avenue to rationally design highly active electrocatalysts.

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Partially sulfurated ultrathin nickel-iron carbonate hydroxides nanosheet boosting the oxygen evolution reaction

Cited by 41 publications

References 58 publications

In Situ Electrochemical Oxidation of Cu₂S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

In Situ Electrochemical Oxidation of Cu₂S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

Neutral-Alkaline Hybrid Water Electrolysis at Less Than 1.43 V Enabled by a Branched NiCo-Hydroxysulfide Nanoarray

Promotion of the Electrocatalytic Oxygen Evolution Reaction by Chemical Coupling of CoOOH Particles to 3D Branched γ-MnOOH Rods

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Partially sulfurated ultrathin nickel-iron carbonate hydroxides nanosheet boosting the oxygen evolution reaction

Cited by 41 publications

References 58 publications

In Situ Electrochemical Oxidation of Cu2S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

In Situ Electrochemical Oxidation of Cu2S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

Neutral-Alkaline Hybrid Water Electrolysis at Less Than 1.43 V Enabled by a Branched NiCo-Hydroxysulfide Nanoarray

Promotion of the Electrocatalytic Oxygen Evolution Reaction by Chemical Coupling of CoOOH Particles to 3D Branched γ-MnOOH Rods

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In Situ Electrochemical Oxidation of Cu₂S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

In Situ Electrochemical Oxidation of Cu₂S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction