Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(7), P. 3694 - 3812

Published: March 22, 2024

Electrocatalytic water splitting driven by renewable electricity has been recognized as a promising approach for green hydrogen production. Different from conventional strategies in developing electrocatalysts the two half-reactions of (e.g., and oxygen evolution reactions, HER OER) separately, there growing interest designing bifunctional electrocatalysts, which are able to catalyze both OER. In addition, considering high overpotentials required OER while limited value produced oxygen, is another rapidly exploring alternative oxidation reactions replace hybrid toward energy-efficient generation. This Review begins with an introduction on fundamental aspects splitting, followed thorough discussion various physicochemical characterization techniques that frequently employed probing active sites, emphasis reconstruction during redox electrolysis. The design, synthesis, performance diverse based noble metals, nonprecious metal-free nanocarbons, overall acidic alkaline electrolytes, thoroughly summarized compared. Next, their application also presented, wherein anodic include sacrificing agents oxidation, pollutants oxidative degradation, organics upgrading. Finally, concise statement current challenges future opportunities presented hope guiding endeavors quest sustainable

Language: Английский

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Amorphous/Crystalline Heterostructure Transition-Metal-based Catalysts for High-Performance Water Splitting

Coordination Chemistry Reviews, Journal Year: 2022, Volume and Issue: 475, P. 214916 - 214916

Published: Oct. 31, 2022

Language: Английский

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Facet Engineering of Advanced Electrocatalysts Toward Hydrogen/Oxygen Evolution Reactions

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: Feb. 16, 2023

The electrocatalytic water splitting technology can generate high-purity hydrogen without emitting carbon dioxide, which is in favor of relieving environmental pollution and energy crisis achieving neutrality. Electrocatalysts effectively reduce the reaction barrier increase efficiency. Facet engineering considered as a promising strategy controlling ratio desired crystal planes on surface. Owing to anisotropy, with different orientations usually feature facet-dependent physical chemical properties, leading differences adsorption energies oxygen or intermediates, thus exhibit varied activity toward evolution (HER) (OER). In this review, brief introduction basic concepts, fundamental understanding mechanisms well key evaluating parameters for both HER OER are provided. formation facets comprehensively overviewed aiming give scientific theory guides realize dominant planes. Subsequently, three strategies selective capping agent, etching coordination modulation tune summarized. Then, we present an overview significant contributions facet-engineered catalysts HER, OER, overall splitting. particular, highlight that density functional calculations play indispensable role unveiling structure–activity correlation between plane catalytic activity. Finally, remaining challenges provided future prospects designing advanced electrocatalysts discussed.

Language: Английский

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Multicomponent transition metal oxides and (oxy)hydroxides for oxygen evolution

Nano Research, Journal Year: 2022, Volume and Issue: 16(2), P. 1913 - 1966

Published: Oct. 2, 2022

Language: Английский

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Principles of Designing Electrocatalyst to Boost Reactivity for Seawater Splitting

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(31)

Published: June 27, 2023

Abstract Directly seawater electrolysis would be a transformative technology for large‐scale carbon‐neutral hydrogenproduction without relying on pure water. However, current splitting is challenged by detrimental chlorine chemistry, the sluggish kinetics, and existence of impurities/precipitates, making it more difficult than water splitting. So far, tremendous efforts have been made to develop electrocatalysts boost electrocatalytic hydrogen evolution reaction (HER) oxygen (OER) activities seawater‐based electrolyzers. To get further insights into achievements future perspectives catalysts electrolysis, general principles are summarized comprehensive optimization, ranging from active sites, electrochemical interface, electron transfer path, fully improve performance electrolysis. Then, aiming at different challenges cathode anode unique strategies design effective cathodic anodic catalysts, such pH criterion, selective HER/OER, Cl − blocking layers, discussed, respectively. Also, several fields which worthy exploration as rational extensions developing toward practical applications put forward.

Language: Английский

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Layered Double Hydroxide Templated Synthesis of Amorphous NiCoFeB as a Multifunctional Electrocatalyst for Overall Water Splitting and Rechargeable Zinc–Air Batteries

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 13(4)

Published: Dec. 5, 2022

Abstract Layered double hydroxides (LDHs) stand out as versatile structural platforms for modulating the electronic structure of highly reactive earth‐abundant transition metal‐based electrocatalysts hydrogen evolution reaction (HER), oxygen (OER), and reduction (ORR). Herein, a Ni‐Co‐Fe LDH, electrodeposited on Ni nanocones (NiNCs)‐decorated foam, acts morphology driving template to direct facile constant potential electrosynthesis NiCoFeB from K 2 B 4 O 7 solution. The amorphous tri‐metal borate (TMB) displays excellent trifunctional electrocatalytic activities toward HER (overpotential at 10 mA cm −2 , η = 174 mV vs RHE), OER (η 208 mV), well ORR (half‐wave 0.723 V) with low Δ E OER−ORR 770 mV, durability over 110 h in alkaline solutions. A zinc–air battery based TMB@NiNC dual catalyst cathode exhibits high open‐circuit voltage 1.477 V, power density 107 mW specific energy 918 W kg Zn −1 an outstanding cycling stability 1330 cycles which outperforms commercial noble metal benchmarks. These results demonstrate that LDHs are efficient sacrificial templates preparation high‐performance multifunctional multi‐metal energy‐related applications.

Language: Английский

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Optimizing Pt-Based Alloy Electrocatalysts for Improved Hydrogen Evolution Performance in Alkaline Electrolytes: A Comprehensive Review

ACS Nano, Journal Year: 2023, Volume and Issue: 17(21), P. 20804 - 20824

Published: Nov. 3, 2023

The splitting of water through electrocatalysis offers a sustainable method for the production hydrogen. In alkaline electrolytes, lack protons forces dissociation to occur before hydrogen evolution reaction (HER). While pure Pt is gold standard electrocatalyst in acidic since 5d orbital nearly fully occupied, when it overlaps with molecular water, generates Pauli repulsion. As result, formation Pt–H* bond an environment difficult, which slows HER and negates benefits using catalyst. To overcome this limitation, can be alloyed transition metals, such as Fe, Co, Ni. This approach has potential not only enhance performance but also increase dispersion decrease its usage, thus overall improving catalyst's cost-effectiveness. excellent adsorption ability metals contributes generation proton-rich local near Pt-based alloy that promotes HER. Significant progress been achieved comprehending mechanism manipulation structure composition electrocatalysts based on alloy. objective review analyze condense latest developments It focuses modified alloys clarifies design principles catalytic catalysts from both experimental theoretical perspective. highlights some difficulties encountered during opportunities increasing performance. Finally, guidance development more efficient provided.

Language: Английский

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Interfacial electronic structure modulation of Ni2P/Ni5P4 heterostructure nanosheets for enhanced pH-universal hydrogen evolution reaction performance

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 464, P. 142538 - 142538

Published: March 21, 2023

Language: Английский

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Optimizing Heterointerface of Co₂P–Co_xO_y Nanoparticles within a Porous Carbon Network for Deciphering Superior Water Splitting

Small Structures, Journal Year: 2023, Volume and Issue: 4(6)

Published: Jan. 4, 2023

It is of great significance to design a bifunctional electrocatalyst for promoting hydrogen (HER) and oxygen (OER) evolution reactions simultaneously. Herein, inspired by the appropriate H atom binding energy on cobalt phosphides excellent kinetics oxides, regulative synthesis Co 2 P–Co x O y (Co = CoO or 3 4 ) heterogeneous nanoparticle‐anchored porous carbon network via one‐pot heat treatment reported. The as‐synthesized /C exhibits superior electrochemical activity with low overpotentials 86 mV HER 246 OER at 10 mA cm −2 in an alkaline electrolyte. Moreover, compared commercial Pt/C || RuO system, system presents outstanding toward overall water splitting (1.55 V@10 ), which well maintained over long‐term (120 h) electrocatalysis. Density functional theory calculations show that rich interfaces between P offer synergistic effect, enables as both OER.

Language: Английский

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Rational Design of Hydrogen Evolution Reaction Electrocatalysts for Commercial Alkaline Water Electrolysis

Small Structures, Journal Year: 2023, Volume and Issue: 4(8)

Published: March 22, 2023

With the further exploitation of renewable energy sources, electrochemical hydrogen evolution reaction (HER) is considered a key technology to solve environmental problems and achieve global carbon neutrality. Currently, alkaline water electrolyzers (AWEs) have been revitalized as traditional electrolytic production industry, yet they face great challenges in achieving new technological breakthroughs due catalytic properties electrode materials. In media, besides slow kinetics oxygen reaction, sluggish HER needing dissociation mass transfer at high current densities are among major factors limiting development electrolysis for industrial applications. Therefore, it importance design electrocatalysts with activity stability (>500 mA cm −2 ) applications “Research Development level” (R&D level). Herein, brief overview AWEs scale presented, some mainstream recognized catalysis mechanisms electrolytes summarized. Based on requirements application theoretical guidance, activation strategies also This review will propose insights into future electrolysis.

Language: Английский

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