scholarly journals Beyond the volcano limitations in electrocatalysis – oxygen evolution reaction

2014 ◽  
Vol 16 (27) ◽  
pp. 13682-13688 ◽  
Author(s):  
Niels Bendtsen Halck ◽  
Valery Petrykin ◽  
Petr Krtil ◽  
Jan Rossmeisl
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Surface Reactivity ◽  
Reaction Intermediates ◽  
Adsorption Energies

Oxygen evolution catalysis is restricted by the interdependence of adsorption energies of the reaction intermediates and the surface reactivity.

Increased activity in the oxygen evolution reaction by Fe4+-induced hole states in perovskite La1−xSrxFeO3

2020 ◽  
Vol 8 (8) ◽  
pp. 4407-4415 ◽  
Author(s):  
Zechao Shen ◽  
Yongbin Zhuang ◽  
Weiwei Li ◽  
Xiaochun Huang ◽  
Freddy E. Oropeza ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Energy Barrier ◽  
Hole State ◽  
Reaction Intermediates ◽  
Increased Activity

Hole for faster OER: The hole state induced by Fe4+ promotes the OER process. It reduces the energy barrier for electron transfer at the interface and facilitates a faster electron transfer from reaction intermediates to the catalyst.

scholarly journals Highly active Bifunctional Lamo3 (M=Cr, Mn, Fe, Co, Ni) Perovskites for Oxygen Reduction and Oxygen Evolution Reaction in Alkaline Media

2020 ◽  
Author(s):  
Areeba Hameed ◽  
Khulood Logade ◽  
Naba Ali ◽  
Priya Ghosh ◽  
Sadiya Shafath ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Energy ◽  
Literature Survey ◽  
Experimental Results ◽  
Alkaline Media ◽  
Reaction Intermediates ◽  
Perovskite Catalyst ◽  
Rate Determining Step

Lanthanum based electrocatalytically active perovskites, LaMO3 (M=Cr, Mn, Fe, Co, Ni), were synthesized using a single step solution combustion synthesis technique. The perovskites showed exceptional performance for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline medium. Based on the experimental results and literature survey, it is suggested that the exceptional activity of Mn and Co based lanthanum perovskite catalyst could be due to the optimum stabilization of reaction intermediates involved in the rate-determining step (RDS) of ORR/OER. According to crystal field theory (CFT), the d-orbital of transition metals are affected by the octahedral arrangement of six negative charges around it. The d orbital degenerates by splitting into two high energy (eg) and three lower energy orbitals (t2g) while maintaining the same average energy level. The rate-determining step in the ORR/OER reaction that based on the eg orbital filling of B site transition metal cations If the d-electrons are less, the valence state goes up and lowering the eg orbital filling that results in strong adsorption of oxygenated species on the B site (strong B-OH bond). This strong bonding limits the overall reaction rate by the slow desorption of OH and its derivatives during ORR/OER. Similarly, too high eg filling causes weak adsorption of oxygenated species that limits the reaction through the slow adsorption of reactants. Therefore, to enhance the activity of ORR/OER reaction it is required to balance the adsorption and desorption of the reactants and the intermediate respectively. The better way is to optimize the eg orbital filling to be nearly 1 (eg = 1).Based on the experimental results and literature survey, it is suggested that the exceptional activity of Mn and Co based lanthanum perovskite catalyst could be due to the optimum stabilization of reaction intermediates involved in the rate-determining step (RDS) of ORR and OER.

Identification of Surface Reactivity Descriptor for Transition Metal Oxides in Oxygen Evolution Reaction

2016 ◽  
Vol 138 (31) ◽  
pp. 9978-9985 ◽  
Author(s):  
Hua Bing Tao ◽  
Liwen Fang ◽  
Jiazang Chen ◽  
Hong Bin Yang ◽  
Jiajian Gao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Oxygen Evolution ◽  
Transition Metal Oxides ◽  
Oxygen Evolution Reaction ◽  
Surface Reactivity ◽  
Reactivity Descriptor

An Fe-doped NiTe bulk crystal as a robust catalyst for the electrochemical oxygen evolution reaction

2019 ◽  
Vol 55 (63) ◽  
pp. 9347-9350 ◽  
Author(s):  
Lei Zhong ◽  
Yufei Bao ◽  
Xu Yu ◽  
Ligang Feng
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Bulk Crystal ◽  
Stable Performance ◽  
Electrochemical Oxygen

An Fe doped NiTe bulk crystal was demonstrated to exhibit an extremely active and stable performance for the electrochemical oxygen evolution reaction.

scholarly journals Robust Carbon-Stabilization of Few-Layer Black Phosphorus for Superior Oxygen Evolution Reaction

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 695 ◽  
Author(s):  
Mengjie Zhang ◽  
Wenchang Zhu ◽  
Xingzhe Yang ◽  
Meng Feng ◽  
Hongbin Feng
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Black Phosphorus ◽  
Carbon Stabilization ◽  
High Durability ◽  
Carbon Coated ◽  
Alkaline Conditions ◽  
Doped Graphene ◽  
A Current

Few-layer exfoliated black phosphorus (Ex-BP) has attracted tremendous attention owing to its promising applications, including in electrocatalysis. However, it remains a challenge to directly use few-layer Ex-BP as oxygen-involved electrocatalyst because it is quite difficult to restrain structural degradation caused by spontaneous oxidation and keep it stable. Here, a robust carbon-stabilization strategy has been implemented to prepare carbon-coated Ex-BP/N-doped graphene nanosheet (Ex-BP/NGS@C) nanostructures at room temperature, which exhibit superior oxygen evolution reaction (OER) activity under alkaline conditions. Specifically, the as-synthesized Ex-BP/NGS@C hybrid presents a low overpotential of 257 mV at a current density of 10 mA cm−2 with a small Tafel slope of 52 mV dec−1 and shows high durability after long-term testing.

scholarly journals Dynamic Surface Chemistry of Catalysts in Oxygen Evolution Reaction

Small Science ◽  
2021 ◽  
pp. 2100011
Author(s):  
Zongkui Kou ◽  
Xin Li ◽  
Lei Zhang ◽  
Wenjie Zang ◽  
Xiaorui Gao ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Dynamic Surface

A binuclear Co-based metal-organic framework towards efficient oxygen evolution reaction

2021 ◽  
Author(s):  
Ning Liu ◽  
Qiaoqiao Zhang ◽  
Jingqi Guan
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Research Interest ◽  
Metal Organic ◽  
Organic Framework

Seeking for low-cost and high-performance electrocatalysts for oxygen evolution reaction (OER) has drawn enormous research interest in the last few years. Reported herein is the topotactic construction of a binuclear...

scholarly journals Postsynthetic treatment of nickel–iron layered double hydroxides for the optimum catalysis of the oxygen evolution reaction

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Daire Tyndall ◽  
Sonia Jaskaniec ◽  
Brian Shortall ◽  
Ahin Roy ◽  
Lee Gannon ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Size Control ◽  
Operating Conditions ◽  
Nickel Iron ◽  
Treatment Techniques ◽  
Site Density ◽  
Synthetic Approaches ◽  
Double Hydroxide ◽  
Double Hydroxides

AbstractNickel–iron-layered double hydroxide (NiFe LDH) platelets with high morphological regularity and submicrometre lateral dimensions were synthesized using a homogeneous precipitation technique for highly efficient catalysis of the oxygen evolution reaction (OER). Considering edge sites are the point of activity, efforts were made to control platelet size within the synthesized dispersions. The goal is to controllably isolate and characterize size-reduced NiFe LDH particles. Synthetic approaches for size control of NiFe LDH platelets have not been transferable based on published work with other LDH materials and for that reason, we instead use postsynthetic treatment techniques to improve edge-site density. In the end, size-reduced NiFe LDH/single-wall carbon nanotube (SWCNT) composites allowed to further reduce the OER overpotential to 237 ± 7 mV (<L> = 0.16 ± 0.01 μm, 20 wt% SWCNT), which is one of the best values reported to date. This approach as well improved the long-term activity of the catalyst in operating conditions.

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