scholarly journals Mechanism for spontaneous oxygen and hydrogen evolution reactions on CoO nanoparticles

2019 ◽  
Vol 7 (12) ◽  
pp. 6708-6719 ◽  
Author(s):  
Kyoung-Won Park ◽  
Alexie M. Kolpak
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
High Efficiency ◽  
Applied Bias ◽  
Co Catalyst ◽  
Photocatalytic Water Splitting ◽  
Overall Water Splitting ◽  
Nanoparticle Suspensions ◽  
Hydrogen Evolution Reactions ◽  
Coo Nanoparticles

Overall photocatalytic water splitting with a high efficiency has recently been observed for CoO nanoparticle suspensions in the absence of an applied bias or co-catalyst. This study clarifies the mechanism of spontaneous overall water splitting with the prominent efficiency observed on the CoO nanoparticle.

Bridge-type interface optimization on a dual-semiconductor heterostructure toward high performance overall water splitting

2018 ◽  
Vol 6 (17) ◽  
pp. 7871-7876 ◽  
Author(s):  
Chong Wang ◽  
Bin Ma ◽  
Xingzhong Cao ◽  
Shan He ◽  
Jingbin Han ◽  
...  
Keyword(s):  
Water Splitting ◽  
High Performance ◽  
High Efficiency ◽  
Co Catalyst ◽  
Overall Water Splitting ◽  
Semiconductor Heterostructure ◽  
Bridge Type

A bridge-type interface was constructed in a Cu2O@ZnCr-LDH photocatalyst, and it imparts high efficiency for overall water splitting without any co-catalyst.

Co-Doped FeS2 with a porous structure for efficient electrocatalytic overall water splitting

2020 ◽  
Vol 44 (5) ◽  
pp. 1711-1718 ◽  
Author(s):  
Lingfeng Gao ◽  
Chengying Guo ◽  
Xuejing Liu ◽  
Xiaojing Ma ◽  
Mingzhu Zhao ◽  
...  
Keyword(s):  
Porous Structure ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Overall Water Splitting ◽  
Earth Abundant ◽  
Low Activity ◽  
Co Doped

The development of earth-abundant and high-efficiency electrocatalysts for overall water splitting is highly fascinating and still presents a challenge caused by the low activity for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) at the same time.

Monolithic-structured ternary hydroxides as freestanding bifunctional electrocatalysts for overall water splitting

2016 ◽  
Vol 4 (19) ◽  
pp. 7245-7250 ◽  
Author(s):  
Xiaolin Zhu ◽  
Cheng Tang ◽  
Hao-Fan Wang ◽  
Bo-Quan Li ◽  
Qiang Zhang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
High Efficiency ◽  
Alkaline Media ◽  
Ni Foam ◽  
Overall Water Splitting ◽  
Bifunctional Electrocatalysts

Fully exposed ternary hydroxides electrodeposited on Ni foam (NiCoFe/NF) exhibited superb oxygen evolution and hydrogen evolution reactivity in alkaline media, and this monolithic-structured electrode further enabled a high-efficiency water electrolyzer.

scholarly journals Electrospun Carbon Nanofibers with Embedded Co-Ceria Nanoparticles for Efficient Hydrogen Evolution and Overall Water Splitting

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 856 ◽  
Author(s):  
Seongwon Woo ◽  
Jooyoung Lee ◽  
Dong Sub Lee ◽  
Jung Kyu Kim ◽  
Byungkwon Lim
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Carbon Nanofibers ◽  
High Efficiency ◽  
Carbon Nanofiber ◽  
Ceria Nanoparticles ◽  
Overall Water Splitting ◽  
Lower Overpotential

In this study, simple electrospinning combined with pyrolysis were used to fabricate transition-metal-based-nanoparticle-incorporated carbon nanofiber (CNF) electrocatalysts for a high-efficiency hydrogen evolution reaction (HER) and overall water splitting. Co-CeO2 nanoparticle-incorporated carbon nanofibers (Co-CeO2@CNF) exhibit an outstanding electrocatalytic HER performance with an overpotential and Tafel slope of 92 mV and 54 mV/dec, respectively. For the counterpart, electrolysis, we incorporate the widely used Ni2Fe catalyst with a high oxygen evolution reaction (OER) activity into the carbon nanofiber (Ni2Fe@CNF). To evaluate their electrochemical properties for the overall water splitting, Co-CeO2@CNF and Ni2Fe@CNF were used as the HER and OER electrocatalysts in an alkaline electrolyzer. With the paired Co-CeO2@CNF and Ni2Fe@CNF electrodes, an overall water splitting current density of 10 mA/cm2 was achieved by applying 1.587 V across the electrodes with a remarkably lower overpotential of 257 mV compared to that of an electrolyzer comprised of Pt/C and IrO2 electrodes (400 mV). Owing to the conformal incorporation of nanoparticles into the CNF, the electrocatalysts exhibit significant long-term durability over 70 h of overall water splitting. This study provides rational designs of catalysts with high electrochemical catalytic activity and durability to achieve overall water splitting.

Interlayer confinement synthesis of Ir nanodots/dual carbon as an electrocatalyst for overall water splitting

2020 ◽  
Author(s):  
Yaru Li ◽  
Yu-Quan Zhu ◽  
Weili Xin ◽  
Song Hong ◽  
Xiaoying Zhao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
High Efficiency ◽  
Overall Water Splitting ◽  
Highly Dispersed

Rationally designing low-content and high-efficiency noble metal nanodots offers opportunities to enhance electrocatalytic performances for water splitting. However, the preparation of highly dispersed nanodots electrocatalysts remains a challenge. Herein, we...

scholarly journals A structurally versatile nickel phosphite acting as a robust bifunctional electrocatalyst for overall water splitting

2018 ◽  
Vol 11 (5) ◽  
pp. 1287-1298 ◽  
Author(s):  
Prashanth W. Menezes ◽  
Chakadola Panda ◽  
Stefan Loos ◽  
Florian Bunschei-Bruns ◽  
Carsten Walter ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Bifunctional Electrocatalyst ◽  
Overall Water Splitting

The mechanistically distinct and synergistic role of phosphite anions in hydrogen evolution and nickel cations in oxygen evolution have been uncovered for active and durable overall water splitting catalysis in nickel phosphite.

Built-in electric field for photocatalytic overall water splitting through a TiO2/BiOBr P–N heterojunction

Nanoscale ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 4496-4504
Author(s):  
Qianqian Chi ◽  
Genping Zhu ◽  
Dongmei Jia ◽  
Wei Ye ◽  
Yikang Wang ◽  
...  
Keyword(s):  
Electric Field ◽  
Water Splitting ◽  
Photocatalytic Water Splitting ◽  
Overall Water Splitting

A p–n heterojunction of TiO2/BiOBr with a strong built-in electric field has been constructed to simultaneously obtain hydrogen and oxygen through a photocatalytic water splitting.

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