Sandwich-like Co(OH)x/Ag/Co(OH)2 nanosheet composites for oxygen evolution reaction in anion exchange membrane water electrolyzer

Guo, Wenwu; Kim, Junhyeong; Kim, Hyunki; Han, Gyeong Ho; Jang, Ho Won; Kim, Soo Young; Ahn, Sang Hyun

doi:10.1016/j.jallcom.2021.161674

Cited by 14 publications

(9 citation statements)

References 49 publications

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“…In addition, two peaks at 786.66 eV and 803.38 eV are attributed to the satellite peak. 52–55 In contrast, the Co 2p 3/2 and Co 2p 1/2 peaks in Ir–Co(OH) 2 @ZIF-67/NF showed a positive shift of 0.21 eV relative to the peak for Co(OH) 2 @ZIF-67/NF, which demonstrates a robust surface electronic interplay from Co to Ir. 56,57 In the high-resolution Ir 4f areas of Ir–Co(OH) 2 @ZIF-67/NF (Fig.…”

Section: Resultsmentioning

confidence: 92%

Ir-Doped Co(OH)₂ nanosheets as an efficient electrocatalyst for the oxygen evolution reaction

et al. 2022

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Section: Resultsmentioning

confidence: 92%

Ir-Doped Co(OH)₂ nanosheets as an efficient electrocatalyst for the oxygen evolution reaction

et al. 2022

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“…As for the Co 2p spectrum in Figure 3c, two intense feature peaks situated at 798 and 781.3 eV correspond to Co 2p 1/2 and Co 2p 3/2 . They all have corresponding satellite peaks located at 803.7 and 786.85 eV, which are indexed to the characteristic signatures of Co(OH) 2 [15,20,21]. The Ni 2p spectrum is exhibited in Figure 3d.…”

Section: Resultsmentioning

confidence: 96%

Hierarchical Design of Co(OH)2/Ni3S2 Heterostructure on Nickel Foam for Energy Storage

Shang

Chi

et al. 2022

Processes

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In this study, we rationally designed a facile stepwise route and successfully synthesized a Co(OH)2/Ni3S2 heterostructure supported on nickel foam (NF) as a binder-free electrode for energy storage. Galvanostatic deposition was first applied to produce uniform Co(OH)2 nanoflakes on NF. Then, Ni3S2 was applied to its surface by potentiostatic deposition to form a Co(OH)2/Ni3S2 heterostructure at room temperature. The added Co(OH)2 not only functions as a practical electrochemically active component but also provides support for the growth of Ni3S2, and the deposition amount of Ni3S2 is controlled by adjusting the electrodeposition duration of Ni3S2. Then, the electrochemical behaviors of the Co(OH)2/Ni3S2 composite can be optimized. A maximum areal specific capacitance (Cs) of 5.73 F cm−2 at 2 mA cm−2 was achieved, and the coulombic efficiency was as high as 94.14%. A capacitance retention of 84.38% was measured after 5000 charge–discharge cycles.

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“…As shown in Figure 7d, it can be seen that the R ct of the AEMWE is small, which means that the NiFe LDHs/Ni fiber electrode has an efficient charge transfer capability in AEMWE [20]. Figure 7d summarizes the performance comparison between the NiFe LDHs/Ni fiber electrode and the newly reported non-noble metal-based self-supporting electrode as the AEMWEs electrode (see Table 2) [4,17,18,20,21,32,49,50]. The above results reveal that the NiFe LDHs/Ni fiber electrode has excellent catalytic activity and electrochemical stability in AEMWE.…”

Section: Performance Of Nife Ldhs/ni Fiber Electrode As the Anode Of ...mentioning

confidence: 92%

“…In a typical procedure, the AEMWE system consists of an anode (NiFe LDHs/Ni fiber, 2 × 2 cm 2 ), a cathode (0.4 mg cm −2 of 70 wt.% Pt/C) coated on the anion exchange membrane (A201, Tokuyama, 2 × 2 cm 2 ), and a gas diffusion layer (carbon paper, Toray) [17][18][19]. Then, the anode, the cathode, an alkaline anion exchange membrane, and carbon paper were hot-pressed at 60 • C and 0.1 MPa for 2 min to obtain membrane electrode assembly (NiFe LDHs/Ni fiber || Pt/C) [20,21].…”

Section: Preparation Of the Aemwe Single-cellmentioning

confidence: 99%

“…NiFeCo LDH || NiFeCo phosphide 1.75 @ 0.5 50 40 @ 0.5 [18] FeOOH/NiFe LDHs@CCH NAs-NF || 70 wt% Pt/C (0.4 mg cm −2 ) 1.768 @ 0.5 70 100 @ 0.5 [32] Co(OH) x /Ag/Co(OH) 2 || 40 wt% Pt/C (not mention) 1.8 @ 0.6 50 24 @ 0.6 [17] VCoCO x @NF || VCoCO x @NF 2.01 @ 0.2 45 12 @ 0.25 [21] CE-CCO || 70% wt Pt/C (1 mg cm −2 ) 1.8 @ 1.39 45 64 @ 0.5 [49] Ni 90 Fe 10 (1 mg cm is not conducive to long-term stability [48]. Ohmic resistance and charge transfer resistance were evaluated by measuring EIS at 1.7 V (about 0.5 A cm −2 ) [4].…”

Section: Stability Test (Hours @ A•cm −2 ) Referencementioning

confidence: 99%

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Self-Supporting NiFe Layered Double Hydroxide “Nanoflower” Cluster Anode Electrode for an Efficient Alkaline Anion Exchange Membrane Water Electrolyzer

Guo

Chi

et al. 2022

Energies

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The development of an efficient and durable oxygen evolution reaction (OER) electrode is needed to solve the bottleneck in the application of an anion exchange membrane water electrolyzer (AEMWE). In this work, the self-supporting NiFe layered double hydroxides (NiFe LDHs) “nanoflower” cluster OER electrode directly grown on the surface of nickel fiber felt (Ni fiber) was synthesized by a one-step impregnation at ambient pressure and temperature. The self-supporting NiFe LDHs/Ni fiber electrode showed excellent activity and stability in a three-electrode system and as the anode of AEMWE. In a three-electrode system, the NiFe LDHs/Ni fiber electrode showed excellent OER performance with an overpotential of 208 mV at a current density of 10 mA cm−2 in 1 M KOH. The NiFe LDHs/Ni fiber electrode was used as the anode of the AEMWE, showing high cell performance with a current density of 0.5 A cm−2 at 1.68 V and a stability test for 200 h in 1 M KOH at 70 °C. The electrocatalytic performance of NiFe LDHs/Ni fiber electrode is due to the special morphological structure of “nanoflower” cluster petals stretching outward to produce the “tip effect,” which is beneficial for the exposure of active sites at the edge and mass transfer under high current density. The experimental results show that the NiFe LDHs/Ni fiber electrode synthesized by the one-step impregnation method has the advantages of good activity and low cost, and it is promising for industrial application.

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Sandwich-like Co(OH)x/Ag/Co(OH)2 nanosheet composites for oxygen evolution reaction in anion exchange membrane water electrolyzer

Cited by 14 publications

References 49 publications

Ir-Doped Co(OH)₂ nanosheets as an efficient electrocatalyst for the oxygen evolution reaction

Ir-Doped Co(OH)₂ nanosheets as an efficient electrocatalyst for the oxygen evolution reaction

Hierarchical Design of Co(OH)2/Ni3S2 Heterostructure on Nickel Foam for Energy Storage

Self-Supporting NiFe Layered Double Hydroxide “Nanoflower” Cluster Anode Electrode for an Efficient Alkaline Anion Exchange Membrane Water Electrolyzer

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Sandwich-like Co(OH)x/Ag/Co(OH)2 nanosheet composites for oxygen evolution reaction in anion exchange membrane water electrolyzer

Cited by 14 publications

References 49 publications

Ir-Doped Co(OH)2 nanosheets as an efficient electrocatalyst for the oxygen evolution reaction

Ir-Doped Co(OH)2 nanosheets as an efficient electrocatalyst for the oxygen evolution reaction

Hierarchical Design of Co(OH)2/Ni3S2 Heterostructure on Nickel Foam for Energy Storage

Self-Supporting NiFe Layered Double Hydroxide “Nanoflower” Cluster Anode Electrode for an Efficient Alkaline Anion Exchange Membrane Water Electrolyzer

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Product

Resources

About

Ir-Doped Co(OH)₂ nanosheets as an efficient electrocatalyst for the oxygen evolution reaction

Ir-Doped Co(OH)₂ nanosheets as an efficient electrocatalyst for the oxygen evolution reaction