Hierarchical cobalt-molybdenum layered double hydroxide arrays power efficient oxygen evolution reaction

Zhu, Xinyi; Lyu, Jiahui; Wang, Shanshan; Li, Xingchuan; Wei, Xiaoyu; Chen, Cheng; Kooamornpattana, Wanida; Verpoort, Francis; Wu, Jinsong; Kou, Zongkui

doi:10.1007/s12274-024-6529-1

Cited by 3 publications

(1 citation statement)

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“…Noble metal based OER catalysts, such as IrO 2 and RuO 2 [16][17][18], demonstrate high activity but are limited by their exorbitant cost, finite reserves, and stability issues, hindering their large-scale application. Abundant non-noble metals such as Ni [19][20][21], Co [22][23][24], and Fe [25][26][27] based compounds, including oxides, hydroxides, oxyhydroxides, and layered double hydroxides (LDHs), have shown promise as OER catalysts. As water electrolysis has already achieved industrialization and is witnessing rapidly growing demand, the capacity of individual alkaline water electrolysis devices has reached over 5 GW, with electrode sizes typically exceeding 2 m. Industrial electrodes are commonly produced using plasma spraying methods, where Raney nickel is applied to the cathode substrate surface, while the anode is typically produced via alloy powder spraying due to its feasibility for large-scale, low-cost manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Large-Scale and Simple Synthesis of NiFe(OH)x Electrode Derived from Raney Ni Precursor for Efficient Alkaline Water Electrolyzer

Li,

Liu,

Xin

et al. 2024

Catalysts

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Water electrolysis is a crucial technology in the production of hydrogen energy. Due to the escalating industrial demand for green hydrogen, the required electrode size for a traditional alkaline water electrolyzer has been increasing. Numerous studies have focused on developing highly active oxygen evolution reaction (OER) catalysts for water electrolysis. However, there remains a significant gap between the microscale synthesis of catalysts in laboratory settings and the macroscale preparation required for industrial scenarios. This challenge is particularly pronounced in the synthesis of sizable self-supported electrodes. In this work, we employed a commercially available Raney Ni-coated Ni mesh as a precursor material to fabricate a self-supported NiFe(OH)x@Raney Ni anode with a substantial dimension exceeding 300 mm through a straightforward immersion technique. The as-prepared electrode exhibited remarkable electrocatalytic OER activity, as an overpotential of only 240 mV is required to achieve 10 mA cm−2. This performance is comparable to that of NiFe-LDHs synthesized via a hydrothermal method, which is difficult to scale up for industrial applications. Furthermore, the electrode demonstrated exceptional durability, maintaining stable operation for over 100 h at a current density of 500 mA cm−2. The large-scale electrode displayed consistent overpotentials across various areas, indicating uniform catalytic activity. When integrated into an alkaline water electrolysis device, it delivered an average cell voltage of 1.80 V at 200 mA cm−2 and achieved a direct current hydrogen production energy consumption as low as 4.3 kWh/Nm3. These findings underline the suitability of electrodes for industrial scale applications, offering a promising alternative for energy-efficient hydrogen production.

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Section: Introductionmentioning

confidence: 99%

Large-Scale and Simple Synthesis of NiFe(OH)x Electrode Derived from Raney Ni Precursor for Efficient Alkaline Water Electrolyzer

Li,

Liu,

Xin

et al. 2024

Catalysts

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Research Progress on Clay‐Based Materials for Electrocatalytic Water Splitting

Qian,

Zhang,

Said

et al. 2024

ChemCatChem

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Clay‐based materials are an emerging family of earth‐abundant and low‐cost inorganic functional materials with an engineeringable layered‐structure mode similar to hydroxides. They are considered as competitive electrocatalysts for water splitting due to their variable intra‐layer ions, exchangeable interlayer molecules/ions, and large reaction surfaces, which demonstrate fascinating engineering opportunities at the microscale, mesoscale and macroscale levels. We systematically summarized the research progress of clay‐based materials by classifying clay‐like compounds, clay‐based composites, and clay‐based derivatives, from the viewpoint of structural geometries towards optimizing functionalities. The design strategies for regulating and optimizing clay‐based materials to meet the requirements of electrocatalysts with excellent activity and stability were outlined through representative examples. In addition, the hydrogen production applications of these clay‐based materials were discussed reasonably including recent advances. Finally, the future perspectives of clay‐based materials for electrocatalytic water splitting are demonstrated.

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