1
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Liu W, Ding X, Cheng J, Jing J, Li T, Huang X, Xie P, Lin X, Ding H, Kuang Y, Zhou D, Sun X. Inhibiting Dissolution of Active Sites in 80 °C Alkaline Water Electrolysis by Oxyanion Engineering. Angew Chem Int Ed Engl 2024; 63:e202406082. [PMID: 38807303 DOI: 10.1002/anie.202406082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Revised: 05/16/2024] [Accepted: 05/28/2024] [Indexed: 05/30/2024]
Abstract
Commercial alkaline water electrolysers typically operate at 80 °C to minimize energy consumption. However, NiFe-based catalysts, considered as one of the most promising candidates for anode, encounter the bottleneck of high solubility at such temperatures. Herein, we discover that the dissolution of NiFe layered double hydroxides (NiFe-LDH) during operation not only leads to degradation of anode itself, but also deactivates cathode for water splitting, resulting in decay of overall electrocatalytic performance. Aiming to suppress the dissolution, we employed oxyanions as inhibitors in electrolyte. The added phosphates to the electrolyte inhibit the loss of NiFe-LDH active sites at 400 mA cm-2 to 1/3 of the original amount, thus reducing the rate of performance decay by 25-fold. Furthermore, the usage of borates, sulfates, and carbonates yields similar results, demonstrating the reliability and universality of the active site dissolution inhibitor, and its role in elevated water electrolysis.
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Affiliation(s)
- Wei Liu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Xiaoqian Ding
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Jingjin Cheng
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Jianlei Jing
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Tianshui Li
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Xin Huang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Pengpeng Xie
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Xichang Lin
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Hanlin Ding
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Yun Kuang
- Ocean Hydrogen Energy R&D Center, Research Institute of Tsinghua University in Shenzhen, Shenzhen, 518057, P. R. China
| | - Daojin Zhou
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Xiaoming Sun
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
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2
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Lu Y, Li J, Bao X, Zhang L, Jing M, Wang K, Luo Q, Gou L, Fan X. Confined growth of Ultrathin, nanometer-sized FeOOH/CoP heterojunction nanosheet arrays as efficient self-supported electrode for oxygen evolution reaction. J Colloid Interface Sci 2024; 667:597-606. [PMID: 38657543 DOI: 10.1016/j.jcis.2024.04.084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 03/28/2024] [Accepted: 04/12/2024] [Indexed: 04/26/2024]
Abstract
Self-supported electrodes, featuring abundant active species and rapid mass transfer, are promising for practical applications in water electrolysis. However, constructing efficient self-supported electrodes with a strong affinity between the catalytic components and the substrate is of great challenge. In this study, by combining the ideas of in-situ construction and space-confined growth, we designed a novel self-supported FeOOH/cobalt phosphide (CoP) heterojunctions grown on a carefully modified commercial Ni foam (NF) with three-dimensional (3D) hierarchically porous Ni skeleton (FeOOH/CoP/3D NF). The specific porous structure of 3D NF directs the confined growth of FeOOH/CoP catalyst into ultra-thin and small-sized nanosheet arrays with abundant edge active sites. The active FeOOH/CoP component is stably anchored on the rough pore wall of 3D NF support, leading to superior stability and improved conductivity. These structural advantages contributed to a highly facilitated oxygen evolution reaction (OER) activity and enhanced durability of the FeOOH/CoP/3D NF electrode. Herein, the FeOOH/CoP/3D NF electrode afforded a low overpotential of 234 mV at 10 mA cm-2 (41 mV smaller than FeOOH/CoP grown on unmodified Ni foam) and high stability for over 90 h, which is among the top reported OER catalysts. Our study provides an effective idea and technique for the construction of active and robust self-supported electrodes for water electrolysis.
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Affiliation(s)
- Yao Lu
- School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China
| | - Julong Li
- School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China
| | - Xiaobing Bao
- School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China.
| | - Lulu Zhang
- School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China
| | - Maosen Jing
- School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China
| | - Kaixin Wang
- School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China
| | - Qiaomei Luo
- School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China
| | - Lei Gou
- School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China.
| | - Xiaoyong Fan
- School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China.
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Li W, Gou W, Zhang L, Zhong M, Ren S, Yu G, Wang C, Chen W, Lu X. Manipulating electron redistribution between iridium and Co 6Mo 6C bridging with a carbon layer leads to a significantly enhanced overall water splitting performance at industrial-level current density. Chem Sci 2024; 15:11890-11901. [PMID: 39092098 PMCID: PMC11290449 DOI: 10.1039/d4sc02840f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Accepted: 06/23/2024] [Indexed: 08/04/2024] Open
Abstract
Nowadays, alkaline water electrocatalysis is regarded as an economical and highly effective approach for large-scale hydrogen production. Highly active electrocatalysts functioning under large current density are urgently required for practical industrial applications. In this work, we present a meticulously designed methodology to anchor Ir nanoparticles on Co6Mo6C nanofibers (Co6Mo6C-Ir NFs) bridging with nitrogen-doped carbon as efficient bifunctional electrocatalysts with both excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activity and stability in alkaline media. With a low Ir content of 5.9 wt%, Co6Mo6C-Ir NFs require the overpotentials of only 348 and 316 mV at 1 A cm-2 for the HER and OER, respectively, and both maintain stability for at least 500 h at ampere-level current density. Consequently, an alkaline electrolyzer based on Co6Mo6C-Ir NFs only needs a voltage of 1.5 V to drive 10 mA cm-2 and possesses excellent durability for 500 h at 1 A cm-2. Density functional theory calculations reveal that the introduction of Ir nanoparticles is pivotal for the enhanced electrocatalytic activity of Co6Mo6C-Ir NFs. The induced interfacial electron redistribution between Ir and Co6Mo6C bridging with nitrogen-doped carbon dramatically modulates the electron structure and activates inert atoms to generate more highly active sites for electrocatalysis. Moreover, the optimized electronic structure is more conducive to the balance of the adsorption and desorption energies of reaction intermediates, thus significantly promoting the HER, OER and overall water splitting performance.
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Affiliation(s)
- Weimo Li
- Alan G. MacDiarmid Institute, College of Chemistry, Jilin University Changchun 130012 P. R. China
| | - Wenqiong Gou
- Engineering Research Center of Industrial Biocatalysis, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian-Taiwan Science and Technology Cooperation Base of Biomedical Materials and Tissue Engineering, College of Chemistry and Materials Science, Academy of Carbon Neutrality of Fujian Normal University, Fujian Normal University Fuzhou 350007 China
| | - Linfeng Zhang
- Alan G. MacDiarmid Institute, College of Chemistry, Jilin University Changchun 130012 P. R. China
| | - Mengxiao Zhong
- Alan G. MacDiarmid Institute, College of Chemistry, Jilin University Changchun 130012 P. R. China
| | - Siyu Ren
- Alan G. MacDiarmid Institute, College of Chemistry, Jilin University Changchun 130012 P. R. China
| | - Guangtao Yu
- Engineering Research Center of Industrial Biocatalysis, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian-Taiwan Science and Technology Cooperation Base of Biomedical Materials and Tissue Engineering, College of Chemistry and Materials Science, Academy of Carbon Neutrality of Fujian Normal University, Fujian Normal University Fuzhou 350007 China
| | - Ce Wang
- Alan G. MacDiarmid Institute, College of Chemistry, Jilin University Changchun 130012 P. R. China
| | - Wei Chen
- Engineering Research Center of Industrial Biocatalysis, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian-Taiwan Science and Technology Cooperation Base of Biomedical Materials and Tissue Engineering, College of Chemistry and Materials Science, Academy of Carbon Neutrality of Fujian Normal University, Fujian Normal University Fuzhou 350007 China
| | - Xiaofeng Lu
- Alan G. MacDiarmid Institute, College of Chemistry, Jilin University Changchun 130012 P. R. China
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4
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Doughty T, Zingl A, Wünschek M, Pichler CM, Watkins MB, Roy S. Structural Reconstruction of a Cobalt- and Ferrocene-Based Metal-Organic Framework during the Electrochemical Oxygen Evolution Reaction. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 39041926 DOI: 10.1021/acsami.4c03262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
Metal-organic frameworks (MOFs) are increasingly being investigated as electrocatalysts for the oxygen evolution reaction (OER) due to their unique modular structures that present a hybrid between molecular and heterogeneous catalysts, featuring well-defined active sites. However, many fundamental questions remain open regarding the electrochemical stability of MOFs, structural reconstruction of coordination sites, and the role of in situ-formed species. Here, we report the structural transformation of a surface-grown MOF containing cobalt nodes and 1,1'-ferrocenedicarboxylic acid linkers (denoted as CoFc-MOF) during the OER in alkaline electrolyte. Ex situ and in situ investigations of CoFc-MOF film suggest that the MOF acts as a precatalyst and undergoes a two-step restructuring process under operating conditions to generate a metal oxyhydroxide phase. The MOF-derived metal oxyhydroxide catalyst, supported on nickel foam electrodes, displays high activity toward the OER with an overpotential of 190 mV at a current density of 10 mA cm-2. While this study demonstrates the necessity of investigating structural evolution of MOFs during electrocatalysis, it also shows the potential of using MOFs as precursors in catalyst design.
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Affiliation(s)
- Thomas Doughty
- School of Chemistry, University of Lincoln, Green Lane, Lincoln LN6 7DL, U.K
| | - Andrea Zingl
- Institute of Applied Physics, TU Vienna, Wiedner Hauptstraße 8-10, Vienna 1040, Austria
| | - Maximilian Wünschek
- Institute of Applied Physics, TU Vienna, Wiedner Hauptstraße 8-10, Vienna 1040, Austria
| | - Christian M Pichler
- Institute of Applied Physics, TU Vienna, Wiedner Hauptstraße 8-10, Vienna 1040, Austria
- Centre of Electrochemical and Surface Technology, Viktor Kaplan Straße 2, Wiener Neustadt 2700, Austria
| | - Matthew B Watkins
- School of Mathematics and Physics, University of Lincoln, Lincoln LN6 7TS, United Kingdom
| | - Souvik Roy
- School of Chemistry, University of Lincoln, Green Lane, Lincoln LN6 7DL, U.K
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5
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van Limpt RTM, Lao M, Tsampas MN, Creatore M. Unraveling the Role of the Stoichiometry of Atomic Layer Deposited Nickel Cobalt Oxides on the Oxygen Evolution Reaction. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2405188. [PMID: 38958233 DOI: 10.1002/advs.202405188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Revised: 06/04/2024] [Indexed: 07/04/2024]
Abstract
Nickel cobalt oxides (NCOs) are promising, non-precious oxygen evolution reaction (OER) electrocatalysts. However, the stoichiometry-dependent electrochemical behavior makes it crucial to understand the structure-OER relationship. In this work, NCO thin film model systems are prepared using atomic layer deposition. In-depth film characterization shows the phase transition from Ni-rich rock-salt films to Co-rich spinel films. Electrochemical analysis in 1 m KOH reveals a synergistic effect between Co and Ni with optimal performance for the 30 at.% Co film after 500 CV cycles. Electrochemical activation correlates with film composition, specifically increasing activation is observed for more Ni-rich films as its bulk transitions to the active (oxy)hydroxide phase. In parallel to this transition, the electrochemical surface area (ECSA) increases up to a factor 8. Using an original approach, the changes in ECSA are decoupled from intrinsic OER activity, leading to the conclusion that 70 at.% Co spinel phase NCO films are intrinsically the most active. The studies point to a chemical composition dependent OER mechanism: Co-rich spinel films show instantly high activities, while the more sustainable Ni-rich rock-salt films require extended activation to increase the ECSA and OER performance. The results highlight the added value of working with model systems to disclose structure-performance mechanisms.
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Affiliation(s)
- Renée T M van Limpt
- Department of Applied Physics and Science Education, Eindhoven University of Technology, Eindhoven, 5600 MB, Netherlands
| | - Mengmeng Lao
- Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven, 5600 HH, Netherlands
| | - Mihalis N Tsampas
- Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven, 5600 HH, Netherlands
| | - Mariadriana Creatore
- Department of Applied Physics and Science Education, Eindhoven University of Technology, Eindhoven, 5600 MB, Netherlands
- Eindhoven Institute for Renewable Energy Systems (EIRES), Eindhoven, 5600 MB, Netherlands
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6
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Xiao Y, Zhang S, Shen Y, Shou J, Kong Y, Su D, Wang X, Yang Q, Yan D, Sun C, Fang S. Optimizing the intermediates adsorbability and revealing the dynamic reconstruction of Co 6Fe 3S 8 solid solution for bifunctional water splitting. J Colloid Interface Sci 2024; 664:329-337. [PMID: 38479269 DOI: 10.1016/j.jcis.2024.03.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 03/06/2024] [Accepted: 03/06/2024] [Indexed: 04/07/2024]
Abstract
Co9S8 has been extensively studied as a promising catalyst for water electrolysis. Doping Co9S8 with Fe improves its oxygen evolution reaction (OER) performance by regulating the catalyst self-reconfigurability and enhancing the absorption capacity of OER intermediates. However, the poor alkaline hydrogen evolution reaction (HER) properties of Co9S8 limit its application in bifunctional water splitting. Herein, we combined Fe doping and sulfur vacancy engineering to synergistically enhance the bifunctional water-splitting performance of Co9S8. The as-synthesized Co6Fe3S8 catalyst exhibited excellent OER and HER characteristics with low overpotentials of 250 and 84 mV, respectively. It also resulted in the low Tafel slopes of 135 mV dec-1 for the OER and 114 mV dec-1 for the HER. A two-electrode electrolytic cell with Co6Fe3S8 used as both the cathode and anode produced a current density of 10 mA cm-2 at a low voltage of only 1.48 V, maintaining high stability for 100 h. The results of in/ex-situ experiments indicated that the OER process induced electrochemical reconfiguration, forming CoOOH/FeOOH active species on the catalyst surface to enhance its OER performance. Density functional theory (DFT) simulations revealed that Fe doping and the presence of unsaturated coordination metal sites in Co6Fe3S8 promoted H2O and H* adsorption for the HER. The findings of this study can help develop a strategy for designing highly efficient bifunctional water splitting electrocatalysts.
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Affiliation(s)
- Yuanhua Xiao
- Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China.
| | - Shiwei Zhang
- Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China
| | - Ya Shen
- Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China
| | - Jinhui Shou
- Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China
| | - Yang Kong
- Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China
| | - Dangcheng Su
- Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China
| | - Xuezhao Wang
- College of Chemical and Food, Zhengzhou University of Technology, Zhengzhou 450044, PR China
| | - Qingxiang Yang
- Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China
| | - Dafeng Yan
- Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China.
| | - Chengguo Sun
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China; School of Chemical Engineering, University of Science and Technology Liaoning, Anshan, 114051, P. R. China.
| | - Shaoming Fang
- Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China
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7
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Du X, Qi M, Wang Y. From Atomic-Level Synthesis to Device-Scale Reactors: A Multiscale Approach to Water Electrolysis. Acc Chem Res 2024; 57:1298-1309. [PMID: 38597422 DOI: 10.1021/acs.accounts.4c00029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
ConspectusThe development of an advanced energy conversion system for water electrolysis with high efficiency and durability is of great significance for a hydrogen-powered society. This progress relies on the fabrication of electrocatalysts with superior electrochemical performance. Despite decades of advancements in exploring high-performance noble and non-noble metal electrocatalysts, several challenges persist at both the micro- and macrolevels in the field of water electrolysis.At the microlevel, which encompasses electrocatalyst synthesis and characterization, design strategies for high-performance electrocatalysts have primarily focused on interface chemical engineering. However, comprehensive understanding and investigation of interface chemical engineering across various length scales, from micrometers to atomic scales, are still lacking. This deficiency hampers the rational design of catalysts with optimal performance. Under harsh reaction conditions, such as high bias potential and highly acidic or alkaline media, the surface of catalyst materials is susceptible to undergoing "reconstruction", deviating from what is observed through ex situ characterization techniques postsynthesis. Conventional ex situ characterization methods do not provide an accurate depiction of the catalyst's structural evolution during the electrocatalytic reaction, hindering the exploration of the catalytic mechanism.At the macrolevel, pertaining to catalysis-performance evaluation systems and devices, traditional laboratory settings employ a conventional three-electrode or two-electrode system to assess the catalytic performance of electrocatalysts. However, this approach does not accurately simulate hydrogen production under realistic industrial conditions, such as elevated temperatures (60-70 °C), high current densities exceeding 0.5 A cm-2, and flowing electrolytes. To address this limitation, it is crucial to develop testing equipment and methodologies that replicate the actual industrial conditions.In this Account, we propose a multiscale research framework for water electrolysis, spanning from microscale synthesis to macroscale scaled reactor design. Our approach focuses on the design and evaluation of high-performance HER/OER (hydrogen evolution reaction/oxygen evolution reaction) electrocatalysts, incorporating the following strategies: Leveraging principles of interface chemical engineering across various length scales (micrometers, nanometers, and atoms) enables the design of catalyst materials that enhance both activity and durability. This approach provides a comprehensive understanding of the intricate interplay between the catalyst structure and activity, implementing in situ/operando characterization techniques to monitor dynamic interfacial reactions and surface reconstruction processes. This facilitates a profound exploration of catalytic reaction mechanisms, offering insights into the catalyst's structural evolution during the electrocatalytic reaction. We construct a laboratory-scale membrane electrode assembly (MEA) electrochemical reactor capable of operating at high current densities (>1 A cm-2) to evaluate the electrocatalytic performance under simulated industrial conditions. This ensures objective and authentic assessments of the catalyst application potential. Throughout the following sections, we illustrate the application of interface chemical engineering on different length scales in designing diverse electrocatalyst materials. We rely on in situ characterization techniques to gain a profound understanding of the mechanisms behind the HER and OER. Additionally, we describe the development of both acidic and alkaline MEA electrochemical reactors to enhance the precision of electrocatalytic performance evaluation. Finally, we provide a concise overview of the challenges and opportunities in this field.
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Affiliation(s)
- Xiangbowen Du
- Advanced Materials and Catalysis Group, Center of Chemistry for Frontier Technologies, State Key Laboratory of Clean Energy Utilization, Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China
| | - Menghui Qi
- Advanced Materials and Catalysis Group, Center of Chemistry for Frontier Technologies, State Key Laboratory of Clean Energy Utilization, Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China
| | - Yong Wang
- Advanced Materials and Catalysis Group, Center of Chemistry for Frontier Technologies, State Key Laboratory of Clean Energy Utilization, Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China
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8
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Liu H, Zhang D, Wang Y, Li H. Reversible Hydrogen Electrode (RHE) Scale Dependent Surface Pourbaix Diagram at Different pH. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7632-7638. [PMID: 38552647 PMCID: PMC11008240 DOI: 10.1021/acs.langmuir.4c00298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 02/23/2024] [Accepted: 02/26/2024] [Indexed: 04/10/2024]
Abstract
In the analysis of electrocatalysis mechanisms and the design of catalysts, the effect of electrochemistry-induced surface coverage is a critical consideration that should not be overlooked. The surface Pourbaix diagram emerges as a fundamental tool in this context, providing essential insights into the surface coverage of adsorbates generated via electrochemical potential-driven water activation. A classic surface Pourbaix diagram considers the pH effects by correcting the free energy of H+ ions by the concentration-dependent term: -kBT ln(10) × pH, which is independent of the reversible hydrogen electrode (RHE) scale. However, this is sometimes inconsistent with the experimentally observed potential-dependent surface coverage at an RHE scale, especially under high-pH conditions. Here, we derived the pH-dependent surface Pourbaix diagram at an RHE scale by considering the energetics computed by density functional theory with the Bayesian Error Estimation Functional with van der Waals corrections (BEEF-vdW), the electric field effects, the derived adsorption-induced dipole moment and polarizability, and the potential of zero-charge. Using Pt(111) as the typical example, we found that the surface coverage predicted by the proposed RHE-dependent surface Pourbaix diagram can significantly minimize the discrepancy between theory and experimental observations, especially under neutral-alkaline, moderate-potential conditions. This work provides a new methodology and establishes guidelines for the precise analysis of the surface coverage prior to the evaluation of the activity of an electrocatalyst.
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Affiliation(s)
- Heng Liu
- Advanced Institute for Materials
Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
| | - Di Zhang
- Advanced Institute for Materials
Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
| | - Yuan Wang
- Advanced Institute for Materials
Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
| | - Hao Li
- Advanced Institute for Materials
Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
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9
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Sun H, Song S. Nickel Hydroxide-Based Electrocatalysts for Promising Electrochemical Oxidation Reactions: Beyond Water Oxidation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2401343. [PMID: 38506594 DOI: 10.1002/smll.202401343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 03/11/2024] [Indexed: 03/21/2024]
Abstract
Transition metal hydroxides have attracted significant research interest for their energy storage and conversion technique applications. In particular, nickel hydroxide (Ni(OH)2 ), with increasing significance, is extensively used in material science and engineering. The past decades have witnessed the flourishing of Ni(OH)2 -based materials as efficient electrocatalysts for water oxidation, which is a critical catalytic reaction for sustainable technologies, such as water electrolysis, fuel cells, CO2 reduction, and metal-air batteries. Coupling the electrochemical oxidation of small molecules to replace water oxidation at the anode is confirmed as an effective and promising strategy for realizing the energy-saving production. The physicochemical properties of Ni(OH)2 related to conventional water oxidation are first presented in this review. Then, recent progress based on Ni(OH)2 materials for these promising electrochemical reactions is symmetrically categorized and reviewed. Significant emphasis is placed on establishing the structure-activity relationship and disclosing the reaction mechanism. Emerging material design strategies for novel electrocatalysts are also highlighted. Finally, the existing challenges and future research directions are presented.
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Affiliation(s)
- Hainan Sun
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, China
| | - Sanzhao Song
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, 325001, China
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10
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Zhang H, Yan S, Yi W, Lu Y, Ma X, Bin Y, Yi L, Wang X. FeP-Fe 3O 4 nanospheres for electrocatalytic N 2 reduction to NH 3 under ambient conditions. Chem Commun (Camb) 2024; 60:2528-2531. [PMID: 38329139 DOI: 10.1039/d3cc04897g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
The electrocatalytic nitrogen reduction reaction (eNRR) under ambient conditions is deemed a promising alternative for NH3 synthesis. In this paper, an FeP-Fe3O4 nanocomposite electrocatalyst was prepared by phosphating annealing using Fe2O3 as a precursor, and the resulting FeP-Fe3O4 exhibited excellent N2-to-NH3-producing activity over a wide potential window. The highest faradaic efficiency of FeP-Fe3O4 is 11.02% at -0.1 V vs. reversible hydrogen electrode (RHE), and the maximum NH3 yield reaches 12.73 μg h-1 mgcat-1, comparable to or exceeding the reported values in this field. Furthermore, the FeP-Fe3O4 nanocomposite electrocatalyst presents high electrochemical stability, selectivity, and durability.
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Affiliation(s)
- Huanhuan Zhang
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, School of Chemistry, Xiangtan University, Xiangtan 411105, P. R. China.
| | - Shuhao Yan
- National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Wei Yi
- School of Biology and Chemistry, Minzu Normal University of Xingyi, Xingyi 562400, P. R. China.
| | - Yebo Lu
- College of Information Science and Engineering, Jiaxing University, Jiaxing 314001, P. R. China.
| | - Xiao Ma
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, School of Chemistry, Xiangtan University, Xiangtan 411105, P. R. China.
| | - Yu Bin
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, School of Chemistry, Xiangtan University, Xiangtan 411105, P. R. China.
| | - Lanhua Yi
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, School of Chemistry, Xiangtan University, Xiangtan 411105, P. R. China.
| | - Xingzhu Wang
- School of Electrical Engineering, University of South China, Hengyang 421001, P. R. China
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China.
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