Ni2P/NiMoP heterostructure as a bifunctional electrocatalyst for energy-saving hydrogen production

eScience, Journal Year: 2021, Volume and Issue: 1(1), P. 69 - 74

Published: Sept. 21, 2021

Electrochemical water splitting is a sustainable and feasible strategy for hydrogen production but hampered by the sluggish anodic oxygen evolution reaction (OER). Herein, an effective approach introduced to significantly decrease cell voltage replacing OER with urea oxidation (UOR). A Ni2P/NiMoP nanosheet catalyst hierarchical architecture uniformly grown on nickel foam (NF) substrate through simple hydrothermal phosphorization method. The achieves impressive HER activity, low overpotential of only 22 mV at 10 mA cm–2 Tafel slope 34.5 dec–1. In addition, reduced from 1.49 V 1.33 after introduction 0.33 M urea. Notably, two-electrode electrolyzer employing as bifunctional exhibits current density 1.35 excellent long-term durability 80 h.

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

---

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

---

Unraveling oxygen vacancy site mechanism of Rh-doped RuO2 catalyst for long-lasting acidic water oxidation

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

Published: March 14, 2023

Exploring durable electrocatalysts with high activity for oxygen evolution reaction (OER) in acidic media is of paramount importance H2 production via polymer electrolyte membrane electrolyzers, yet it remains urgently challenging. Herein, we report a synergistic strategy Rh doping and surface vacancies to precisely regulate unconventional OER path the Ru-O-Rh active sites Rh-RuO2, simultaneously boosting intrinsic stability. The stabilized low-valent catalyst exhibits remarkable performance, an overpotential 161 mV at 10 mA cm-2 retention 99.2% exceeding 700 h 50 cm-2. Quasi situ/operando characterizations demonstrate recurrence reversible species under working potentials enhanced durability. It theoretically revealed that Rh-RuO2 passes through more optimal lattice mediated mechanism-oxygen vacancy site mechanism induced by interaction defects rate-determining step *O formation, breaking barrier limitation (*OOH) traditional adsorption mechanism.

Language: Английский

---

Hydrogen production by water electrolysis technologies: A review

Results in Engineering, Journal Year: 2023, Volume and Issue: 20, P. 101426 - 101426

Published: Sept. 19, 2023

Hydrogen as an energy source has been identified optimal pathway for mitigating climate change by combining renewable electricity with water electrolysis systems. Proton exchange membrane (PEM) technology received a substantial amount of attention because its ability to efficiently produce high-purity hydrogen while minimising challenges associated handling and maintenance. Another generation technology, alkaline (AWE), widely used in commercial production applications. Anion (AEM) can at relatively low costs the noble metal catalysts PEM AWE systems are replaced conventional low-cost electrocatalysts. Solid oxide electrolyzer cell (SOEC) is another producing high conversion efficiencies, cost, emissions. However, operating temperatures SOECs which necessitates long startup times. This review addresses current state technologies capable using impure Commercially available were extensively discussed compared. The technical barriers AEM also investigated. Furthermore, stack performance was evaluated artificial river (soft water). An integrated system approach recommended meeting power pure demands reversible seawater electricity, electrolysis, fuel cells. considered be low, requiring further developments enhance membrane's lifetime.

Language: Английский

---

PtSe₂/Pt Heterointerface with Reduced Coordination for Boosted Hydrogen Evolution Reaction

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(43), P. 23388 - 23393

Published: Aug. 9, 2021

Abstract PtSe 2 is a typical noble metal dichalcogenide (NMD) that holds promising possibility for next‐generation electronics and photonics. However, when applied in hydrogen evolution reaction (HER), it exhibits sluggish kinetics due to the insufficient capability of absorbing active species. Here, we construct /Pt heterointerface boost dynamics , enabled by an situ electrochemical method. It found Se vacancies are induced around heterointerface, reducing coordination environment. Correspondingly, exposed Pt atoms at very vicinity activated, with enhanced overlap H 1s orbital. The adsorption . intermediate thus strengthened, achieving near thermoneutral free energy change. Consequently, as‐prepared extraordinary HER activity even superior Pt/C, overpotential 42 mV 10 mA cm −2 Tafel slope 53 dec −1 This work raises attention on NMDs toward provides insights rational construction novel heterointerfaces.

Language: Английский

---

Recent progress on the long‐term stability of hydrogen evolution reaction electrocatalysts

InfoMat, Journal Year: 2022, Volume and Issue: 4(9)

Published: Aug. 23, 2022

Abstract Developing new methodologies to produce clean and renewable energy resources is pivotal for carbon‐neutral initiatives. Hydrogen (H 2 ) considered as an ideal resource due its nontoxic, pollution‐free, high utilization rate, calorific combustion value. Electrolysis of water driven by the electricity generated from sources (e.g., solar energy, wind energy) hydrogen attracts great efforts production with purity. Recently, breakthrough catalyst activity limit evolution reaction (HER) catalysts has received extensive attention. Comparatively, fewer reviews have focused on long‐term stability HER catalysts, which indeed decisive large‐scale electrolytic industrialization. Therefore, a systematic summary concentrated durability electrocatalysts would provide fundamental understanding electrocatalytic performance practical applications offer opportunities rational design highly performed electrocatalysts. This review summarizes research progress toward precious metals, transition metal‐free in past few years. It discusses challenges future perspectives. We anticipate that it valuable basis designing robust image

Language: Английский

---

PEM water electrolysis for hydrogen production: fundamentals, advances, and prospects

Carbon Neutrality, Journal Year: 2022, Volume and Issue: 1(1)

Published: June 2, 2022

Hydrogen, as a clean energy carrier, is of great potential to be an alternative fuel in the future. Proton exchange membrane (PEM) water electrolysis hailed most desired technology for high purity hydrogen production and self-consistent with volatility renewable energies, has ignited much attention past decades based on current density, greater efficiency, small mass-volume characteristic, easy handling maintenance. To date, substantial efforts have been devoted development advanced electrocatalysts improve electrolytic efficiency reduce cost PEM electrolyser. In this review, we firstly compare alkaline (AWE), solid oxide (SOE), highlight advantages electrolysis. Furthermore, summarize recent progress including evolution reaction (HER) oxygen (OER) acidic electrolyte. We also introduce other cell components (including electrode assembly, collector, bipolar plate). Finally, challenges outlook future application are provided.

Language: Английский

---

Work‐function‐induced Interfacial Built‐in Electric Fields in Os‐OsSe₂Heterostructures for Active Acidic and Alkaline Hydrogen Evolution

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(36)

Published: July 13, 2022

Theoretical calculations unveil that the formation of Os-OsSe2 heterostructures with neutralized work function (WF) perfectly balances electronic state between strong (Os) and weak (OsSe2 ) adsorbents bidirectionally optimizes hydrogen evolution reaction (HER) activity Os sites, significantly reducing thermodynamic energy barrier accelerating kinetics process. Then, heterostructural is constructed for first time by a molten salt method confirmed in-depth structural characterization. Impressively, due to highly active sites endowed charge balance effect, exhibits ultra-low overpotentials HER in both acidic (26 mV @ 10 mA cm-2 alkaline (23 media, surpassing commercial Pt catalysts. Moreover, solar-to-hydrogen device assembled further highlights its potential application prospects. Profoundly, this special heterostructure provides new model rational selection heterocomponents.

Language: Английский

---

Current and future trends for spinel-type electrocatalysts in electrocatalytic oxygen evolution reaction

Coordination Chemistry Reviews, Journal Year: 2022, Volume and Issue: 475, P. 214869 - 214869

Published: Oct. 14, 2022

Language: Английский

---