Cationic defect-enriched hydroxides as anodic catalysts for efficient seawater electrolysis

Zhao, Shenlong; Wu, Yue; Zheng, Jia; Zhou, Xiaofang; Tu, Teng-xiu; Liu, Yangyang; Zhang, Pengfang; Tan, Liang

doi:10.1039/d3qi00026e

Cited by 15 publications

(7 citation statements)

References 60 publications

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“…The substantial attack of OH − on the electrode surface during electrocatalytic OER further promotes this dissolution process. The dissolution of Zn 2+ and Cr 3+ results in the creation of M 2+ and M 3+ vacancies, respectively, leading to a more comprehensive exposure of the active sites [38][39][40]. This enhanced exposure is responsible for the improved OER activity of U-NiFeZnCoCr-LDH during stability testing.…”

Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of Ultrathin High-Entropy Layered Double Hydroxides for Ampere-Level Water Oxidation

Jing,

Liu,

et al. 2024

Catalysts

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The development of high-entropy anodes, known for their excellent catalytic activity for water oxidation, can depress the energy consumption of hydrogen production by water electrolysis. However, the complex preparation methods and poor stability hindered their practical application. In this work, a one-step co-precipitation method has been modified to rapidly synthesize ultrathin high-entropy layered double hydroxide containing Ni, Co, Fe, Cr, Zn. Through the rational selection of metal elements, the stability of the optimized anode under Ampere-level current density has been significantly improved. Compared to NiFe-LDH, the active site leaching of high-entropy LDH is reduced by 42.7%, and as a result, it achieves a performance decay that is approximately eight times lower than that of NiFe-LDH. Experiment results show that the active sites in the high-entropy LDH can maintain a relatively low oxidation state both before and after activation, thus preventing material deactivation caused by excessive oxidation.

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Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of Ultrathin High-Entropy Layered Double Hydroxides for Ampere-Level Water Oxidation

Jing,

Liu,

et al. 2024

Catalysts

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“…[106,107] Zhao et al reported a cationic defect-rich NiFe LDH (CD-NiFe LDH-E) through cationic defect engineering for OER in alkaline seawater (Figure 7j). [108] Due to the existence of abundant defects (Figure 7k), the CD-NiFe LDH-E rendered a high OER performance to achieve 500 mA cm −2 at only 348 mV in simulated alkaline seawater. However, the structural stability especially around the defect is worthy of further consideration, which should control the defect concentration or fix the defect by coupling with other materials to generate strong interaction.…”

Section: Strategies For Improving Activitymentioning

confidence: 99%

mentioning

confidence: 99%

Direct Seawater Electrolysis: From Catalyst Design to Device Applications

Fei,

Liu,

Liu

et al. 2023

Advanced Materials

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Direct seawater electrolysis (DSE) for hydrogen production, using earth‐abundant seawater as the feedstock and renewable electricity as the driving source, paves a new opportunity for flexible energy conversion/storage and smooths the volatility of renewable energy. Unfortunately, the complex environments of seawater impose significant challenges on the design of DSE catalysts, and the practical performance of many current DSE catalysts remains unsatisfactory on the device level. However, many studies predominantly concentrated on the development of electrocatalysts for DSE without giving due consideration to the specific devices. To mitigate this gap, we systematically evaluated the most recent progress (mainly published within the year 2020–2023) of DSE electrocatalysts and devices. By discussing key bottlenecks, corresponding mitigation strategies, and various device designs and applications, we emphasize that it is tremendously challenging to address the trade‐off among activity, stability, and selectivity for DSE electrocatalysts by a single shot. In addition, the rational design of the DSE electrocatalysts needs to align with the specific device configuration, which is more effective than attempting to comprehensively enhance all catalytic parameters. This work, featuring the first review of this kind to consider rational catalyst design in the framework of DSE devices, will facilitate practical DSE development.This article is protected by copyright. All rights reserved

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“…The greatest challenge originates from the concentrated chloride ions (Cl – ) in seawater. Specifically, the chlorine oxidation reaction could compete with the OER and thus reduce the seawater splitting efficiency. − Additionally, the Cl – and its derivatives like hypochlorite (ClO – ) may seriously corrode the catalysts via the metal chloride–hydroxide formation processes, resulting in fast activity degradation. − Consequently, developing highly active, selective, and durable OER catalysts is crucial yet challenging for practical seawater electrolysis.…”

Section: Introductionmentioning

confidence: 99%

Highly Durable and Efficient Seawater Electrolysis Enabled by Defective Graphene-Confined Nanoreactor

Gong,

Liu,

Yan

et al. 2023

ACS Nano

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Cationic defect-enriched hydroxides as anodic catalysts for efficient seawater electrolysis

Abstract: Seawater electrocatalysis driven by renewable energy resources has long been considered as a promising approach to producing clean hydrogen. However, the anodic electrode materials suffer from severe issues such as...

Cited by 15 publications

References 60 publications

One-Step Synthesis of Ultrathin High-Entropy Layered Double Hydroxides for Ampere-Level Water Oxidation

One-Step Synthesis of Ultrathin High-Entropy Layered Double Hydroxides for Ampere-Level Water Oxidation

Direct Seawater Electrolysis: From Catalyst Design to Device Applications

Highly Durable and Efficient Seawater Electrolysis Enabled by Defective Graphene-Confined Nanoreactor

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