Partially reduced NiO by cellulose as a highly active catalyst for oxygen evolution reaction: synergy between in situ generated Ni 3+ and lattice oxygen

2021 ◽  
Author(s):  
Xuerui Yi ◽  
Fengxiang Yin ◽  
Xiaobo He ◽  
Guoru Li
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Catalyst ◽  
Lattice Oxygen ◽  
Highly Active

scholarly journals A Cobalt-Iron Double-Atom Catalyst for the Oxygen Evolution Reaction

2019 ◽  
Author(s):  
Lichen Bai ◽  
Chia-Shuo Hsu ◽  
Duncan Alexander ◽  
Hao Ming Chen ◽  
Xile Hu
Keyword(s):  
Oxygen Evolution ◽  
Active Site ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Single Atom ◽  
X Ray ◽  
Highly Active ◽  
Cobalt Iron ◽  
X Ray Absorption

Single atom catalysts exhibit well-defined active sites and potentially maximum atomic efficiency. However, they are unsuitable for reactions that benefit from bimetallic promotion such as the oxygen evolution reaction (OER) in alkaline medium. Here we show that a single atom Co precatalyst can be in-situ transformed into a Co-Fe double atom catalyst for OER. This catalyst exhibits one of the highest turnover frequencies among metal oxides. Electrochemical, microscopic, and spectroscopic data including those from operando X-ray absorption spectroscopy, reveal a dimeric Co-Fe moiety as the active site of the catalyst. This work demonstrates double-atom catalysis as a promising approach for the developed of defined and highly active OER catalysts.

(Invited) In-Situ Study of the Activated Lattice Oxygen Redox Reactions in Metal Oxides during Oxygen Evolution Catalysis

2018 ◽  
Vol MA2018-01 (32) ◽  
pp. 1935-1935
Author(s):  
Binghong Han ◽  
Yang Shao-Horn
Keyword(s):  
Metal Oxides ◽  
Oxygen Evolution ◽  
Perovskite Oxides ◽  
Systematic Investigation ◽  
Lattice Oxygen ◽  
Energy Storage And Conversion ◽  
Electrochemical Tests ◽  
Highly Active ◽  
The Stability

Promoting the oxygen evolution reaction (OER) near room temperature is critical to improve the efficiency of many electrochemical energy storage and conversion techniques, such as water splitting and rechargeable metal-air batteries. Nowadays, researchers have developed many non-precious metal oxides as highly active OER catalysts, including many perovskite oxides (ABO3) of first-row transition metals such as LaCoO3-δ (LCO), SrCoO3-δ (SCO), and Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF). However, understanding the interaction between oxides catalysts and water, which determines the stability and activity of the oxide OER catalysts, is still challenging. Here we report the systematic investigation between water and various perovskite oxides with different electronic structures, using a series of in situ characterization techniques including on-line electrochemical mass spectrometry (OLEMS), environmental transmission electron microscopy (ETEM), and pH-dependent electrochemical tests. It is find that having an oxygen 2p-band closer to the Fermi level and increasing the covalency of metal-oxygen bonds could facilitate the redox reaction of lattice oxygen in perovskites during OER catalysis. In the oxides such as SCO and BSCF with activated lattice oxygen in the OER process, we observe the evolving of 18O-labeled lattice oxygen in OLEMS, the strong pH dependency of OER kinetics in electrochemical measurements, and the structural oscillation in ETEM, which all indicate a new oxygen-site OER mechanism that makes the perovskites more active and less stable. While in the oxides such as LCO with no lattice oxygen activation, all of the above phenomena are missing, implying a stable surface with traditional metal-site OER mechanism. Observing the perovskites in situ during OER allows us to better understand the interaction between electrolytes and oxides, providing us a deeper insight into the stability and active site of oxide catalysts for OER.

Electrochemical etching of α-cobalt hydroxide for improvement of oxygen evolution reaction

2016 ◽  
Vol 4 (24) ◽  
pp. 9578-9584 ◽  
Author(s):  
Peng Fei Liu ◽  
Shuang Yang ◽  
Li Rong Zheng ◽  
Bo Zhang ◽  
Hua Gui Yang
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Electrochemical Etching ◽  
Cobalt Hydroxide ◽  
Highly Active

Electrochemically etched α-Co(OH)2–Cl, due to the dechlorination-induced defective structures and in situ formation of CoOOH fragments, are highly active for OER.

Rod-like nickel doped Co3Se4/reduced graphene oxide hybrids as efficient electrocatalysts for oxygen evolution reactions

Nanoscale ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 3698-3708
Author(s):  
Wenlong Ye ◽  
Yanan Zhang ◽  
Jinchen Fan ◽  
Penghui Shi ◽  
Yulin Min ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Catalyst ◽  
Highly Active ◽  
Slow Kinetics ◽  
Reduced Graphene ◽  
Kinetics Of

Highly active catalyst of Ni-doped rod-like Co3Se4/reduced graphene oxide was designed for reducing the overpotential and improving the slow kinetics of the process toward electrocatalytic oxygen evolution reaction (OER).

scholarly journals A Cobalt-Iron Double-Atom Catalyst for the Oxygen Evolution Reaction

2019 ◽  
Author(s):  
Lichen Bai ◽  
Chia-Shuo Hsu ◽  
Duncan Alexander ◽  
Hao Ming Chen ◽  
Xile Hu
Keyword(s):  
Oxygen Evolution ◽  
Active Site ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Single Atom ◽  
X Ray ◽  
Highly Active ◽  
Cobalt Iron ◽  
X Ray Absorption

Single atom catalysts exhibit well-defined active sites and potentially maximum atomic efficiency. However, they are unsuitable for reactions that benefit from bimetallic promotion such as the oxygen evolution reaction (OER) in alkaline medium. Here we show that a single atom Co precatalyst can be in-situ transformed into a Co-Fe double atom catalyst for OER. This catalyst exhibits one of the highest turnover frequencies among metal oxides. Electrochemical, microscopic, and spectroscopic data including those from operando X-ray absorption spectroscopy, reveal a dimeric Co-Fe moiety as the active site of the catalyst. This work demonstrates double-atom catalysis as a promising approach for the developed of defined and highly active OER catalysts.

Unveiling the active sites of Ni–Fe phosphide/metaphosphate for efficient oxygen evolution under alkaline conditions

2019 ◽  
Vol 55 (53) ◽  
pp. 7687-7690 ◽  
Author(s):  
Can Huang ◽  
Ying Zou ◽  
Ya-Qian Ye ◽  
Ting Ouyang ◽  
Kang Xiao ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Highly Active ◽  
Alkaline Conditions ◽  
Stable Oxygen

The highly active and stable oxygen evolution reaction (OER) performance of Ni–Fe phosphide/metaphosphate (Ni1−xFex-P/PO3) can originate from in situ generated Fe doped γ-NiOOH.

In situ generated highly active copper oxide catalysts for the oxygen evolution reaction at low overpotential in alkaline solutions

2016 ◽  
Vol 52 (32) ◽  
pp. 5546-5549 ◽  
Author(s):  
Xiang Liu ◽  
Shengsheng Cui ◽  
Manman Qian ◽  
Zijun Sun ◽  
Pingwu Du
Keyword(s):  
Copper Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Oxide Catalyst ◽  
Oxide Catalysts ◽  
Alkaline Solutions ◽  
Catalyst Film ◽  
Highly Active

A highly active copper oxide catalyst film is generated in situ from copper(ii) diamine complex for oxygen evolution reaction with high performance and excellent durability in alkaline solutions.

scholarly journals Constructing an Adaptive Heterojunction as a Highly Active Catalyst for the Oxygen Evolution Reaction

2020 ◽  
Vol 32 (30) ◽  
pp. 2001292 ◽  
Author(s):  
Xiao Ren ◽  
Chao Wei ◽  
Yuanmiao Sun ◽  
Xiaozhi Liu ◽  
Fanqi Meng ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Catalyst ◽  
Highly Active
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