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

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.

2017 ◽  
Vol 5 (45) ◽  
pp. 23898-23908 ◽  
Author(s):  
Dongxiao Ji ◽  
Shengjie Peng ◽  
Li Fan ◽  
Linlin Li ◽  
Xiaohong Qin ◽  
...  

A thin MoS2 nanosheets grafted MOF derived Co–N–C flake grown on electrospun carbon nanofiber film was designed and mass-produced. The material exhibited superior bifunctional catalytic activity for overall water splitting.


2019 ◽  
Vol 7 (12) ◽  
pp. 6708-6719 ◽  
Author(s):  
Kyoung-Won Park ◽  
Alexie M. Kolpak

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.


2017 ◽  
Vol 5 (16) ◽  
pp. 7507-7515 ◽  
Author(s):  
Dongxiao Ji ◽  
Shengjie Peng ◽  
Jia Lu ◽  
Linlin Li ◽  
Shengyuan Yang ◽  
...  

Free-standing Fe3C embedded Fe/N doped carbon nanofiber films are prepared based on electrospinning and demonstrate efficient ORR/HER catalytic activity and superior stability.


2016 ◽  
Vol 4 (41) ◽  
pp. 16028-16035 ◽  
Author(s):  
Huawei Huang ◽  
Chang Yu ◽  
Juan Yang ◽  
Xiaotong Han ◽  
Changtai Zhao ◽  
...  

Active site-enriched Fe2P nanodots anchored on graphene sheets (Fe2P-ND/FG) exhibit enhanced catalytic activity and stability for the hydrogen evolution reaction.


2020 ◽  
Vol 44 (5) ◽  
pp. 1711-1718 ◽  
Author(s):  
Lingfeng Gao ◽  
Chengying Guo ◽  
Xuejing Liu ◽  
Xiaojing Ma ◽  
Mingzhu Zhao ◽  
...  

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.


2020 ◽  
Vol 49 (38) ◽  
pp. 13352-13358 ◽  
Author(s):  
Wenpin Wang ◽  
Yue Xu ◽  
Jiali Yao ◽  
Xien Liu ◽  
Zhengmao Yin ◽  
...  

A facile one-spot strategy to prepare carbon-layer-coated CoS2–FeS2 heterojunction nanosheets was developed; it exhibited excellent overall water splitting activity with 1.66 V at 10 mA cm−2 and maintained the long-term stability over 26 h.


2016 ◽  
Vol 4 (19) ◽  
pp. 7245-7250 ◽  
Author(s):  
Xiaolin Zhu ◽  
Cheng Tang ◽  
Hao-Fan Wang ◽  
Bo-Quan Li ◽  
Qiang Zhang ◽  
...  

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.


2019 ◽  
Vol 55 (71) ◽  
pp. 10511-10514 ◽  
Author(s):  
Chaoxiong Zhang ◽  
Haoxuan Liu ◽  
Jia He ◽  
Guangzhi Hu ◽  
Haihong Bao ◽  
...  

Herein, vanadyl pyrophosphate nanosheets have been firstly reported as a novel catalyst for hydrogen evolution with superb catalytic activity, and also exhibited outstanding performance for overall water splitting in an alkaline electrolyte.


Author(s):  
Yaru Li ◽  
Yu-Quan Zhu ◽  
Weili Xin ◽  
Song Hong ◽  
Xiaoying Zhao ◽  
...  

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...


2018 ◽  
Vol 11 (5) ◽  
pp. 1287-1298 ◽  
Author(s):  
Prashanth W. Menezes ◽  
Chakadola Panda ◽  
Stefan Loos ◽  
Florian Bunschei-Bruns ◽  
Carsten Walter ◽  
...  

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.


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