Chromium‐Induced High Covalent Co–O Bonds for Efficient Anodic Catalysts in PEM Electrolyzer DOI Creative Commons
Qisheng Yan, Jie Feng, Wen‐Juan Shi

et al.

Advanced Science, Journal Year: 2024, Volume and Issue: 11(25)

Published: April 22, 2024

Abstract The proton exchange membrane water electrolyzer (PEMWE), crucial for green hydrogen production, is challenged by the scarcity and high cost of iridium‐based materials. Cobalt oxides, as ideal electrocatalysts oxygen evolution reaction (OER), have not been extensively applied in PEMWE, due to extremely voltage poor stability at large current density, caused complicated structural variations cobalt compounds during OER process. Thus, authors sought introduce chromium into a spinel (Co 3 O 4 ) catalyst regulate electronic structure cobalt, exhibiting higher oxidation state increased Co–O covalency with stable structure. In‐depth operando characterizations theoretical calculations revealed that activated adaptable redox behavior are facilitating its activity. Both turnover frequency mass activity Cr‐doped Co (CoCr) 1.67 V (vs RHE) over eight times than those as‐synthesized . obtained CoCr achieved 1500 mA cm −2 2.17 exhibited notable durability extended operation periods – 100 h 500 , demonstrating promising application PEMWE industry.

Language: Английский

Ultrathin and Conformal Depletion Layer of Core/Shell Heterojunction Enables Efficient and Stable Acidic Water Oxidation DOI
Yang Liu, Yan Huang,

Duojie Wu

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(39), P. 26897 - 26908

Published: Sept. 23, 2024

Ru-based electrocatalysts hold great promise for developing affordable proton exchange membrane (PEM) electrolyzers. However, the harsh acidic oxidative environment of oxygen evolution reaction (OER) often causes undesirable overoxidation Ru active sites and subsequent serious activity loss. Here, we present an ultrathin conformal depletion layer attached to Schottky heterojunction core/shell RuCo/RuCoO

Language: Английский

Citations

12
Modified NiFe2O4-Supported Graphene Oxide for Effective Urea Electrochemical Oxidation and Water Splitting Applications DOI Creative Commons
Fowzia S. Alamro, Shymaa S. Medany, Nada S. Al‐Kadhi

et al.

Molecules, Journal Year: 2024, Volume and Issue: 29(6), P. 1215 - 1215

Published: March 8, 2024

The production of green hydrogen using water electrolysis is widely regarded as one the most promising technologies. On other hand, oxygen evolution reaction (OER) thermodynamically unfavorable and needs significant overpotential to proceed at a sufficient rate. Here, we outline important structural chemical factors that affect how well representative nickel ferrite-modified graphene oxide electrocatalyst performs in efficient splitting applications. activities modified pristine oxide-supported ferrite were thoroughly characterized terms their structural, morphological, electrochemical properties. This research shows NiFe2O4@GO electrode has an impact on both urea oxidation (UOR) was observed have current density 26.6 mA cm−2 1.0 M KOH scan rate 20 mV s−1. Tafel slope provided for UOR 39 dec−1, whereas GC/NiFe2O4@GO reached 10 potentials +1.5 −0.21 V (vs. RHE) OER (HER), respectively. Furthermore, charge transfer resistances estimated HER 133 347 Ω cm2,

Language: Английский

Citations

11
Noble-Metal-Free Metal Oxides for Catalyzing Acidic Oxygen and Hydrogen Evolution Reactions: Recent Developments and Future Perspectives DOI

Zhongliang Dong,

Bowen Li, Yinlong Zhu

et al.

Energy & Fuels, Journal Year: 2024, Volume and Issue: 38(14), P. 12387 - 12408

Published: April 11, 2024

Proton exchange membrane (PEM) water electrolysis has emerged as a highly promising technology for sustainable hydrogen (H2) production, but its widespread application relies heavily on the development of high-performance and cost-effective evolution reaction (HER) oxygen (OER) electrocatalysts. Currently, noble-metal-based materials (such Pt Ir/Ru oxides) serve benchmark electrocatalysts HER OER in acidic environments, their high cost limited availability pose major challenges toward industrialization. Low-cost noble-metal-free metal oxides are an important class functional with rich compositions structures, offering flexible electronic crystal structures tunable physical chemical properties. In this Review, we present comprehensive timely summary remarkable progress achieved field catalyzing OER. First, provide brief description fundamental concepts media, including mechanisms, computational activity descriptors, experimental parameters that utilized evaluation catalytic performance. Second, overview is provided covering various types media reported so far (e.g., simple transition oxides, spinel rutile antimonate perovskite specially structured mixed-metal-oxide composites), focus designed strategies enhancing performance establishing correlations between properties activity. Lastly, future research directions regarding summarized discussed.

Language: Английский

Citations

11
Scaling Up Stability: Navigating from Lab Insights to Robust Oxygen Evolution Electrocatalysts for Industrial Water Electrolysis DOI
Faiza Meharban, Chao Lin,

Xiaotong Wu

et al.

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 29, 2024

Abstract In the pursuit of sustainable hydrogen production via water electrolysis, paramount importance electrocatalyst stability emerges as a defining factor for long‐term industrial viability. A thorough understanding and enhancement not only ensure extended catalyst lifetimes but also pave way consistent efficient generation. This review focuses on pivotal role in determining practical viability oxygen evolution electrocatalysts (OECs) large‐scale applications electrolysis production. The paper explores over initial activity, citing examples hypothetical scenarios. First, figures merits evaluation are explained along with available benchmarking protocols evaluation. Further, text delves into various strategies that can enhance which include self‐healing/regeneration pathway, reaction (OER) mechanism optimization to achieve highly stable OER stabilization active metals atoms within inhibit dissolution forward application. interplay stability, cost is suit application electrocatalyst. Lastly, it outlines challenges, prospects, future directions, presenting guide advancing OECs generation landscape.

Language: Английский

Citations

11
Chromium‐Induced High Covalent Co–O Bonds for Efficient Anodic Catalysts in PEM Electrolyzer DOI Creative Commons
Qisheng Yan, Jie Feng, Wen‐Juan Shi

et al.

Advanced Science, Journal Year: 2024, Volume and Issue: 11(25)

Published: April 22, 2024

Abstract The proton exchange membrane water electrolyzer (PEMWE), crucial for green hydrogen production, is challenged by the scarcity and high cost of iridium‐based materials. Cobalt oxides, as ideal electrocatalysts oxygen evolution reaction (OER), have not been extensively applied in PEMWE, due to extremely voltage poor stability at large current density, caused complicated structural variations cobalt compounds during OER process. Thus, authors sought introduce chromium into a spinel (Co 3 O 4 ) catalyst regulate electronic structure cobalt, exhibiting higher oxidation state increased Co–O covalency with stable structure. In‐depth operando characterizations theoretical calculations revealed that activated adaptable redox behavior are facilitating its activity. Both turnover frequency mass activity Cr‐doped Co (CoCr) 1.67 V (vs RHE) over eight times than those as‐synthesized . obtained CoCr achieved 1500 mA cm −2 2.17 exhibited notable durability extended operation periods – 100 h 500 , demonstrating promising application PEMWE industry.

Language: Английский

Citations

9