Ultralow-iridium content NiIr alloy derivative nanochain arrays as bifunctional electrocatalysts for overall water splitting

Cai, Zhengyang; Wang, Ping; Zhao, Xin; Bu, Xiuming; Zhang, Jiajia; Chen, Yuhao; Xu, Jingcheng; Yan, Ya; Chen, Aiying; Wang, Ding

doi:10.1039/d3ra01845h

RSC Adv.

2023

DOI: 10.1039/d3ra01845h

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Ultralow-iridium content NiIr alloy derivative nanochain arrays as bifunctional electrocatalysts for overall water splitting

Zhengyang Cai

Ping Wang

Xin Zhao

et al.

Abstract: An ultralow-iridium content nickel–iridium alloy derivative nanochain array with a self-supported three-dimensional core–shell structure for efficient and durable overall water splitting.

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2024

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Selective Capacitive Removal of Pb²⁺ from Wastewater over Biochar Electrodes by Zinc Regulation

Wu,

Feng,

Tang

et al. 2024

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Biochar materials have shown great potential for broad catalytic application. However, using these materials in the capacitive deionization technology (CDI) system for heavy metal removal still faces a significant challenge due to their low specific capacity and removal capability. Here, a comprehensive regulation on the interfacial/bulk electrochemistry of biochar by Zn doping is reported, which suggests a high renewable capacity (20 mg g−1) and outstanding selective capacitive removal ability (SCR) of Pb2+ from leachate. The SCR efficiency of Pb2+ is as high as 99% compared to K+ (8%), Na+ (13%), and Cd2+ (37%). This work proves that the doped Zn on the biochar can combine with OH− generated by water splitting to form M─OH bonds, which is beneficial for improving the specific capacity. Significantly, the relationship between double‐layer capacitance and pseudo‐capacitance can also be optimized by regulating the content of Zn, leading to different removal abilities of heavy metals. Therefore, this work offers insights into charge‐storage kinetics, which provide valuable guidelines for designing and optimizing the biochar electrode for broader environmental applications.

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Selective Capacitive Removal of Pb²⁺ from Wastewater over Biochar Electrodes by Zinc Regulation

Wu,

Feng,

Tang

et al. 2024

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Boosting the Oxygen Evolution Reaction Performance of Inert ZnO by Incorporating Ni and Trace-Level Ir for Scalable and Industrial-Level Water-Splitting Catalysts

Yoon,

Kwon,

Lee

et al. 2024

ACS Sustainable Chem. Eng.

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Developing efficient and durable electrocatalysts for hydrogen production from water splitting via the oxygen evolution reaction (OER) is a significant challenge. To address this issue, we designed a Ni and trace amount of Ir incorporated ZnO heteroelectrocatalyst on nickel foam (Ir/Ni−ZnO@NF) using a facile and scalable dip-coating method without any binder. The incorporation of Ir and Ni into the ZnO host material enables the formation of an even thin film without surface cracking, facilitates residual stress relaxation, and significantly enhances OER activity. Our systematic study revealed that increased Ir incorporation in the Ir/Ni−ZnO enhances the Ni 3+ content, leading to improved OER performance. The optimized Ir/Ni−ZnO exhibited excellent OER catalytic performance with an overpotential of 294.4 mV at 100 mA cm −2 and a Tafel slope of 66.89 mV dec −1 . Additionally, we investigated the optimized Ir/Ni−ZnO@NF as the anode electrode of a practical anion exchange membrane water electrolyzer (AEMWE). The enlarged Ir/Ni−ZnO@NF anode electrode (3 cm × 3 cm) exhibited a cell voltage of 1.975 V at a current density of 8 A cm −2 and stable operation over 17 h in the AEMWE system. These findings confirm the development of highperforming and durable heterocatalysts, and their promising scalable and practical application for hydrogen production by watersplitting.

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Ultralow-iridium content NiIr alloy derivative nanochain arrays as bifunctional electrocatalysts for overall water splitting

Abstract: An ultralow-iridium content nickel–iridium alloy derivative nanochain array with a self-supported three-dimensional core–shell structure for efficient and durable overall water splitting.

Cited by 2 publications

References 58 publications

Selective Capacitive Removal of Pb²⁺ from Wastewater over Biochar Electrodes by Zinc Regulation

Selective Capacitive Removal of Pb²⁺ from Wastewater over Biochar Electrodes by Zinc Regulation

Boosting the Oxygen Evolution Reaction Performance of Inert ZnO by Incorporating Ni and Trace-Level Ir for Scalable and Industrial-Level Water-Splitting Catalysts

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Resources

About

Ultralow-iridium content NiIr alloy derivative nanochain arrays as bifunctional electrocatalysts for overall water splitting

Abstract: An ultralow-iridium content nickel–iridium alloy derivative nanochain array with a self-supported three-dimensional core–shell structure for efficient and durable overall water splitting.

Cited by 2 publications

References 58 publications

Selective Capacitive Removal of Pb2+ from Wastewater over Biochar Electrodes by Zinc Regulation

Selective Capacitive Removal of Pb2+ from Wastewater over Biochar Electrodes by Zinc Regulation

Boosting the Oxygen Evolution Reaction Performance of Inert ZnO by Incorporating Ni and Trace-Level Ir for Scalable and Industrial-Level Water-Splitting Catalysts

Contact Info

Product

Resources

About

Selective Capacitive Removal of Pb²⁺ from Wastewater over Biochar Electrodes by Zinc Regulation

Selective Capacitive Removal of Pb²⁺ from Wastewater over Biochar Electrodes by Zinc Regulation