Non-iridium-based electrocatalyst for durable acidic oxygen evolution reaction in proton exchange membrane water electrolysis

Nature Materials, Journal Year: 2022, Volume and Issue: 22(1), P. 100 - 108

Published: Oct. 20, 2022

Language: Английский

---

Oxygen Evolution/Reduction Reaction Catalysts: From In Situ Monitoring and Reaction Mechanisms to Rational Design

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(9), P. 6257 - 6358

Published: March 21, 2023

The oxygen evolution reaction (OER) and reduction (ORR) are core steps of various energy conversion storage systems. However, their sluggish kinetics, i.e., the demanding multielectron transfer processes, still render OER/ORR catalysts less efficient for practical applications. Moreover, complexity catalyst–electrolyte interface makes a comprehensive understanding intrinsic mechanisms challenging. Fortunately, recent advances in situ/operando characterization techniques have facilitated kinetic monitoring under conditions. Here we provide selected highlights mechanistic studies with main emphasis placed on heterogeneous systems (primarily discussing first-row transition metals which operate basic conditions), followed by brief outlook molecular catalysts. Key sections this review focused determination true active species, identification sites, reactive intermediates. For in-depth insights into above factors, short overview metrics accurate characterizations is provided. A combination obtained time-resolved information reliable activity data will then guide rational design new Strategies such as optimizing restructuring process well overcoming adsorption-energy scaling relations be discussed. Finally, pending current challenges prospects toward development homogeneous presented.

Language: Английский

---

Electrochemical Water Splitting: Bridging the Gaps Between Fundamental Research and Industrial Applications

Energy & environment materials, Journal Year: 2022, Volume and Issue: 6(5)

Published: May 28, 2022

Electrochemical water splitting represents one of the most promising technologies to produce green hydrogen, which can help realize goal achieving carbon neutrality. While substantial efforts on a laboratory scale have been made for understanding fundamental catalysis and developing high‐performance electrocatalysts two half‐reactions involved in electrocatalysis, much less attention has paid doing relevant research larger scale. For example, few such researches done an industrial Herein, we review very recent endeavors bridge gaps between applications electrolysis. We begin by introducing fundamentals electrochemical then present comparisons testing protocol, figure merit, catalyst interest, manufacturing cost industry‐based water‐electrolysis research. Special is tracking surface reconstruction process identifying real catalytic species under different conditions, highlight significant distinctions corresponding mechanisms. Advances designs industry‐relevant electrolysis are also summarized, reveal progress moving practical forward accelerating synergies material science engineering. Perspectives challenges electrocatalyst design strategies proposed finally further lab‐scale large‐scale electrocatalysis applications.

Language: Английский

---

Hydrogen Spillover-Bridged Volmer/Tafel Processes Enabling Ampere-Level Current Density Alkaline Hydrogen Evolution Reaction under Low Overpotential

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(13), P. 6028 - 6039

Published: March 18, 2022

Water-alkaline electrolysis holds a great promise for industry-scale hydrogen production but is hindered by the lack of enabling evolution reaction electrocatalysts to operate at ampere-level current densities under low overpotentials. Here, we report use spillover-bridged water dissociation/hydrogen formation processes occurring synergistically hybridized Ni3S2/Cr2S3 sites incapacitate inhibition effect high-current-density-induced high coverage dissociation site and concurrently promote Volmer/Tafel processes. The mechanistic insights critically important enable density operation are depicted from experimental theoretical studies. Volmer process drastically boosted strong H2O adsorption Cr5c Cr2S3, efficient H2O* via heterolytic cleavage (Cr5c-H2O* + S3c(#) → Cr5c-OH* S3c-H#) on Cr5c/S3c in rapid desorption OH* Cr2S3via new water-assisted mechanism (Cr5c-OH* H2O(aq) Cr5c-H2O* OH-(aq)), while Tafel achieved through spillover rapidly transfer H# located H-rich (Cr2S3) H-deficient (Ni3S2) with excellent activity. As result, electrocatalyst can readily achieve 3.5 A cm-2 an overpotential 251 ± 3 mV 1.0 M KOH electrolyte. concept exemplified this work provides useful means address shortfalls current-density-tolerant Hydrogen (HER) electrocatalysts.

Language: Английский

---

Recent advances in proton exchange membrane water electrolysis

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 52(16), P. 5652 - 5683

Published: Jan. 1, 2023

This review scrutinizes recent progress in PEMWE system including mechanisms, the correlation among structure-composition–performance, manufacturing, design and operation protocols. The challenges perspectives for applications are proposed.

Language: Английский

---

Customized reaction route for ruthenium oxide towards stabilized water oxidation in high-performance PEM electrolyzers

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Feb. 15, 2023

The poor stability of Ru-based acidic oxygen evolution (OER) electrocatalysts has greatly hampered their application in polymer electrolyte membrane electrolyzers (PEMWEs). Traditional understanding performance degradation centered on influence bias fails describing the trend, calling for deep dive into essential origin inactivation. Here we uncover decisive role reaction route (including catalytic mechanism and intermediates binding strength) operational catalysts. Using MRuOx (M = Ce4+, Sn4+, Ru4+, Cr4+) solid solution as structure model, find route, thereby stability, can be customized by controlling Ru charge. screened SnRuOx thus exhibits orders magnitude lifespan extension. A scalable PEMWE single cell using anode conveys an ever-smallest rate 53 μV h-1 during a 1300 h operation at 1 cm-2.

Language: Английский

---

Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(14)

Published: Feb. 17, 2022

Abstract Proton exchange membrane water electrolyzer (PEMWE) technology is of interest in the context electrocatalytic hydrogen generation from renewable energies. It has benefits immediate response, higher proton conductivity, lower ohmic losses, and gas crossover rate. One key step toward to large‐scale application, development highly efficient, durable, compatible anodic oxygen evolution electrocatalysts acidic media decrease usage expensive scarce precious metals. Within this scenario, an in‐depth understanding reaction mechanisms including adsorption mechanism lattice first provided aid innovative materials elucidate origin catalyst degradation. Second, recent progress acid reviewed with emphasis on underlying structure–performance relationships. Third, current application status research PEMWEs along representative examples are discussed. Last, remaining challenges promising insights proposed inspire future studies production energy.

Language: Английский

---

Dual‐Atom Support Boosts Nickel‐Catalyzed Urea Electrooxidation

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(22)

Published: March 24, 2023

Nickel-based catalysts have been regarded as one of the most promising electrocatalysts for urea oxidation reaction (UOR), however, their activity is largely limited by inevitable self-oxidation Ni species (NSOR) during UOR. Here, we proposed an interface chemistry modulation strategy to trigger occurrence UOR before NSOR via constructing a 2D/2D heterostructure that consists ultrathin NiO anchored Ru-Co dual-atom support (Ru-Co DAS/NiO). Operando spectroscopic characterizations confirm this unique triggering mechanism on surface DAS/NiO. Consequently, fabricated catalyst exhibits outstanding with low potential 1.288 V at 10 mA cm-2 and remarkable long-term durability more than 330 h operation. DFT calculations demonstrate favorable electronic structure induced heterointerface endows energetically NSOR.

Language: Английский

---

Regulating active hydrogen adsorbed on grain boundary defects of nano-nickel for boosting ammonia electrosynthesis from nitrate

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(6), P. 2611 - 2620

Published: Jan. 1, 2023

The grain boundary defect engineered Ni nanoparticles has been explored for boosting selective nitrate electroreduction to ammonia, and its NH 3 generation rate is much higher than those of the reported copper or noble metal-based catalysts.

Language: Английский

---

Long‐Term Stability Challenges and Opportunities in Acidic Oxygen Evolution Electrocatalysis

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(11)

Published: Dec. 22, 2022

Abstract Polymer electrolyte membrane water electrolysis (PEMWE) has been regarded as a promising technology for renewable hydrogen production. However, acidic oxygen evolution reaction (OER) catalysts with long‐term stability impose grand challenge in its large‐scale industrialization. In this review, critical factors that may lead to catalyst's instability couple potential solutions are comprehensively discussed, including mechanical peeling, substrate corrosion, active‐site over‐oxidation/dissolution, reconstruction, oxide crystal structure collapse through the lattice oxygen‐participated pathway, etc. Last but not least, personal prospects provided terms of rigorous evaluation criteria, situ / operando characterizations, economic feasibility and practical electrolyzer consideration, highlighting ternary relationship evolution, industrial‐relevant activity serve roadmap towards ultimate application PEMWE.

Language: Английский

---