Advanced Transition Metal‐Based OER Electrocatalysts: Current Status, Opportunities, and Challenges

Small, Год журнала: 2021, Номер 17(37)

Опубликована: Июнь 10, 2021

Abstract Oxygen evolution reaction (OER) is an important half‐reaction involved in many electrochemical applications, such as water splitting and rechargeable metal–air batteries. However, the sluggish kinetics of its four‐electron transfer process becomes a bottleneck to performance enhancement. Thus, rational design electrocatalysts for OER based on thorough understanding mechanisms structure‐activity relationship vital significance. This review begins with introduction which include conventional adsorbate mechanism lattice‐oxygen‐mediated mechanism. The pathways related intermediates are discussed detail, several descriptors greatly assist catalyst screen optimization summarized. Some parameters suggested measurement criteria also mentioned discussed. Then, recent developments breakthroughs experimental achievements transition metal‐based reviewed reveal novel principles. Finally, some perspectives future directions proposed further catalytic enhancement deeper design. It believed that iterative improvements fundamental principles essential realize applications efficient energy storage conversion technologies.

Язык: Английский

---

Multifunctional Transition Metal‐Based Phosphides in Energy‐Related Electrocatalysis

Advanced Energy Materials, Год журнала: 2019, Номер 10(11)

Опубликована: Сен. 24, 2019

Abstract The exploitation of cheap and efficient electrocatalysts is the key to make energy‐related electrocatalytic techniques commercially viable. In recent years, transition metal phosphides (TMPs) have gained a great deal attention owing their multifunctional active sites, tunable structure, composition, as well unique physicochemical properties. This review summarizes up‐to‐date progress on TMPs in electrocatalysis from diversified synthetic methods, ingenious‐modulated strategies, novel applications. order set forth theory–structure–performance relationships upon TMPs, corresponding reaction mechanisms, electrocatalytsts' structure/composition designs desired electrochemical performance are jointly discussed, along with demonstrating practical applications overall water splitting, metal–air batteries, lithium–sulfur etc. end, some underpinning issues research orientations toward briefly proposed.

Язык: Английский

---

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

Advanced Materials, Год журнала: 2021, Номер 33(17)

Опубликована: Март 22, 2021

Abstract Electrochemical water splitting has attracted significant attention as a key pathway for the development of renewable energy systems. Fabricating efficient electrocatalysts these processes is intensely desired to reduce their overpotentials and facilitate practical applications. Recently, metal–organic framework (MOF) nanoarchitectures featuring ultrahigh surface areas, tunable nanostructures, excellent porosities have emerged promising materials highly active catalysts electrochemical splitting. Herein, most pivotal advances in recent research on engineering MOF are presented. First, design catalytic centers MOF‐based/derived summarized compared from aspects chemical composition optimization structural functionalization at atomic molecular levels. Subsequently, fast‐growing breakthroughs activities, identification sites, fundamental mechanisms thoroughly discussed. Finally, comprehensive commentary current primary challenges future perspectives its commercialization hydrogen production provided. Hereby, new insights into synthetic principles electrocatalysis designing utilization offered, thus further promoting prosperity wide range

Язык: Английский

---

Electronic Redistribution: Construction and Modulation of Interface Engineering on CoP for Enhancing Overall Water Splitting

Advanced Functional Materials, Год журнала: 2020, Номер 30(14)

Опубликована: Фев. 20, 2020

Abstract Modulating and constructing interface engineering is an efficient strategy to enhance catalytic activity for water splitting. Herein, a hybrid nanoarray structure of V‐CoP@a‐CeO 2 , where “a” represents amorphous, integrated into carbon cloth fabricated The synergy effect between V CeO can increase the electron density Co atoms at active sites, further optimizing Gibbs free energy H* adsorption (Δ G ). Besides, possesses lower adsorption/dissociation energies, enabling accelerated reaction kinetics in alkaline media. As expected, exhibits superior performance toward hydrogen evolution oxygen reaction. More importantly, two‐electrode electrolyzer combined with electrocatalyst V‐CoP@ a‐CeO only demands that voltages electrolytic cell are 1.56 1.71 achieve current densities 10 100 mA cm −2 respectively. This work provides guidance design or optimization materials electrolysis beyond.

Язык: Английский

---

Earth-abundant transition-metal-based bifunctional catalysts for overall electrochemical water splitting: A review

Journal of Alloys and Compounds, Год журнала: 2019, Номер 819, С. 153346 - 153346

Опубликована: Дек. 16, 2019

Язык: Английский

---

Perfecting electrocatalystsviaimperfections: towards the large-scale deployment of water electrolysis technology

Energy & Environmental Science, Год журнала: 2021, Номер 14(4), С. 1722 - 1770

Опубликована: Янв. 1, 2021

A tuned electronic structure favors the electrocatalytic water splitting reactionviaaccelerating reaction kinetics, changing rate-determining step, and optimizing adsorption energy for intermediates; this is achievedviaintentionally incorporating imperfections into crystal lattices of electrocatalysts.

Язык: Английский

---

Transition Metal Phosphide‐Based Materials for Efficient Electrochemical Hydrogen Evolution: A Critical Review

ChemSusChem, Год журнала: 2020, Номер 13(13), С. 3357 - 3375

Опубликована: Март 20, 2020

Abstract As hydrogen has been increasingly considered as promising sustainable energy supply, electrochemical overall water splitting driven by highly efficient non‐noble metal electrocatalysts aroused extensive attention. Transition phosphides (TMPs) have demonstrated remarkable electrocatalytic performance, including high activity and robust durability towards evolution reaction (HER) in acidic alkaline well neutral electrolytes. In this Review, up‐to‐date progress of TMP‐based HER is summarized. Various synthesis strategies TMPs based on selected phosphorus sources are presented, the mechanisms contribution to briefly discussed. The multiscale approaches for promoting stability catalysts discussed with respect intrinsic electronic structure, hybrids, microstructure, working electrode interface. Some crucial issues future perspectives pointed out. These modulated challenges also instructive constructing other high‐activity energy‐related electrocatalysts.

Язык: Английский

---

Heteroatom‐Doping of Non‐Noble Metal‐Based Catalysts for Electrocatalytic Hydrogen Evolution: An Electronic Structure Tuning Strategy

Small Methods, Год журнала: 2021, Номер 5(4)

Опубликована: Янв. 25, 2021

Abstract Electrocatalytic water splitting for hydrogen production is an appealing way to reduce carbon emissions and generate renewable fuels. This promising process, however, limited by its sluggish reaction kinetics high‐cost catalysts. Construction of low‐cost high‐performance non‐noble metal‐based catalysts have been one the most effective approaches address these grand challenges. Notably, electronic structure tuning strategy, which could subtly tailor states, band structures, adsorption ability catalysts, has become a pivotal further enhance electrochemical reactions based on Particularly, heteroatom‐doping plays role in regulating optimizing intrinsic activity Nevertheless, kinetics, particular, functional mechanisms hetero‐dopants yet remains ambiguous. Herein, recent progress comprehensively reviewed heteroatom doped electrocatalysts evolution reaction, particularly focus effect corresponding synthetic pathway, catalytic performance, origin. review also attempts establish correlation between localized structures properties, so as provide good reference developing advanced

Язык: Английский

---

RuNi Nanoparticles Embedded in N‐Doped Carbon Nanofibers as a Robust Bifunctional Catalyst for Efficient Overall Water Splitting

Advanced Science, Год журнала: 2019, Номер 7(2)

Опубликована: Ноя. 18, 2019

Developing high-performance, low-cost, and robust bifunctional electrocatalysts for overall water splitting is extremely indispensable challenging. It a promising strategy to couple highly active precious metals with transition as efficient electrocatalysts, which can not only effectively reduce the cost of preparation procedure, but also greatly improve performance catalysts through synergistic effect. Herein, Ru Ni nanoparticles embedded within nitrogen-doped carbon nanofibers (RuNi-NCNFs) are synthesized via simple electrospinning technology subsequent carbonization process. The as-formed RuNi-NCNFs represent excellent Pt-like electrocatalytic activity hydrogen evolution reaction (HER) in both alkaline acidic conditions. Furthermore, exhibit an outstanding oxygen (OER) overpotential 290 mV achieve current density 10 mA cm

Язык: Английский

---

Halogen‐Doped Carbon Dots on Amorphous Cobalt Phosphide as Robust Electrocatalysts for Overall Water Splitting

Advanced Energy Materials, Год журнала: 2022, Номер 12(14)

Опубликована: Янв. 24, 2022

Abstract Designing a stable and efficient dual‐functional catalyst for the hydrogen evolution oxygen reactions (HER/OER) is of great significance to development production by water splitting. This work reports on novel halogen (X = F, Cl, Br)‐doped carbon dots modifying amorphous cobalt phosphide (X‐CDs/CoP), which can be tuned choice X‐CDs have urchin, Pinus bungeana , Albizia julibrissin type structures. The different characteristics various led formation mechanisms final As bifunctional catalyst, urchin‐shaped F‐CDs/CoP crystals achieve superior electrocatalytic performance, exhibiting excellent HER/OER activity sustained stability in an alkaline solution. For overall splitting, they provide current density 10 mA cm −2 require low cell voltage 1.48 V 1 M KOH. In addition, catalytic performance shows negligible degradation after 100 h, thus demonstrating long‐term cycling stability. Density functional theory calculations show that improved catalysts due coupling interface between CoP F‐CDs, optimizes hydrogen/oxygen adsorption energy accelerates splitting kinetics. provides guidance rational design transition metal electrocatalysts with outstanding performance.

Язык: Английский

---