Bifunctional oxygen electrocatalyst derived from photochlorinated graphene for rechargeable solid-state Zn-air battery

Zhang, Baoxi; Zhang, Enhao; Wang, Shunyao; Zhang, Yuanyuan; Ma, Zhuangzhuang; Qiu, Yunfeng

doi:10.1016/j.jcis.2019.02.044

Cited by 26 publications

(12 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is predicted the p-type doping in chlorinated graphene contained lots of positively charged carbon atoms for the favorable adsorption of OOH*, which is the rate-determining step for the OER process. , Meanwhile, the defects will favor the exposure of active sites and facilitate mass transport . However, on the basis of previous work, the Cl 2 photochlorination method always led to very low carrier mobility, namely, the resistance increased greatly, which is detrimental to the electron transfer during electrochemical process. , We found similar results using the Cl 2 photochlorination method . Therefore, it is urgent to develop an ecofriendly strategy, instead of using the highly toxic Cl 2 , that is still an effective way to simultaneously maintain the intrinsic mobility and defects in graphene.…”

Section: Introductionsupporting

confidence: 69%

Chlorinated Graphene via the Photodecomposition of Metal Chlorides

Wang

Zhang

et al. 2019

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Searching for a facile and sustainable chlorination method to modify graphene has drawn tremendous attention due to the modulation of its electronic property and surface chemistry. In contrast to the previously developed Cl2 photochlorination method via Cl radicals, present work found that the photodecomposition of metal chlorides under UV light irradiation was able to chlorinate graphene taking into account both appropriate Cl contents and high carrier mobility. Field-effect transistor proved that the mobility was around 345.5 cm2 V–1 s–1 when introducing 4.3 atom % Cl dopants. Raman proved that UV irradiation resulted in structural defects to favor the mass transport in electrochemical reactions. Chlorinated vertically oriented graphene nanosheets on carbon cloth exhibited improved oxygen evolution reaction performance in comparison to that of pristine graphene. The specific electrochemical active area and charge transfer analysis indicated that Cl-doping was favorable for the exposure of active sites and fast electron transport, thus driving the electrochemical kinetics by virtue of a small Tafel value (59 mV dec–1). The direct growth of graphene nanosheets on carbon cloth endowed the free-standing film with robust durability. The present work opens a new avenue for the chlorinated graphene considering all merits for electrochemical activities and will provide promising candidates for application in energy storage and conversion fields.

show abstract

Section: Introductionsupporting

confidence: 69%

Chlorinated Graphene via the Photodecomposition of Metal Chlorides

Wang

Zhang

et al. 2019

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…D bands arise from A 1 g vibration mode of carbon owing to defects and doped heteroatoms disordering the graphitic lattice, while G bands arise from the E 2 g vibration mode of C−C stretching signifies highly ordered crystalline carbon . The intensity ratio of D and G bands (named as I D /I G ) means the structure defects of the synthesized carbon matrix caused by heteroatoms doping . Figure b shows the results of I D /I G of as‐prepared CoSMe‐X‐800 samples.…”

Section: Resultsmentioning

confidence: 99%

Cobalt Nanoparticles Embedded in N, S Co‐Doped Carbon towards Oxygen Reduction Reaction Derived by in situ Reducing Cobalt Sulfide

Dong

Zhang

et al. 2019

ChemCatChem

View full text Add to dashboard Cite

Herein, a novel electrocatalysts of cobalt nanoparticles embedded in N, S co-doped carbon matrix derived by in situ reducing Co 9 S 8 are designed and prepared successfully through two-calcination methods, and applied for oxygen reduction reaction (ORR). Due to the large surface area and pore volume, richness of defects existing the carbon nanotubes, interaction of S species and N species and special direction of electron transfers between Co and S ions, the earth-abundant and lowcost CoSMe-0.5-800 presents a highly efficient ORR activity and stability. The onset potential, half-wave potential and limiting current density of CoSMe-0.5-800 are 0.95 V, 0.85 V, and 4.31 mA cm À 2 , which are higher than that of commercial Pt/C (0.93 V, 0.83 V, 4.19 mA cm À 2 ). More importantly, the interaction between N and S heteroatoms in system gets revealed, that S resources can help to improve the degree of N doping and raise the ratio of pyridinic N species working as the active site for ORR. With the increase of S resources, electrons that should have been transferred from cobalt to sulfur have moved in the opposite direction, which has a negative effect on ORR active performance. This work shows the potential to design advanced Co-based N, S co-doped catalysts with high electrochemical performance and low cost, which could be applied for fuel cells and other devices.[a] Z.

show abstract

“…are usually introduced into the carbon matrix to tune the partial electronic structure and change the charge density distribution of carbon, leading to the improvement of catalytic activity. [ 163–166 ] Generally, nitrogen doping was widely investigated, and DFT calculations suggested that the carbon atoms situated at the armchair edge and adjacent to the graphitic N dopants acted as more active sites for the ORR and OER. [ 167–170 ] Marcilla et al reported a kind of CNT fiber fabricated by direct chemical vapor deposition (CVD) spinning and then treated by a facile hydrothermal reaction with urea.…”

Section: Bifunctional Oxygen Electrocatalysts For Flexible Zabsmentioning

confidence: 99%

Air Electrodes for Flexible and Rechargeable Zn−Air Batteries

et al. 2021

View full text Add to dashboard Cite

Rechargeable Zn−air batteries (ZABs) have attracted increasing attention as one of the most promising future energy power sources due to their relatively high specific energy density, environmental friendliness, safety, and low cost. In particular, flexible ZABs are desirable for portable and wearable electronic devices, in which the cathode can utilize air directly from the atmosphere with significantly enhanced energy density. Therefore, the air electrode consisting of oxygen electrocatalysts is the most critical component in flexible ZABs, significantly governing the overall battery performance and cost. This review highlights recent achievements in designing efficient oxygen electrocatalysts and air electrodes for rechargeable and flexible ZABs. First, the most significant innovations of recent battery configurations to improve flexibility and battery performance are introduced. Then, oxygen electrocatalysts developed for fabricating high‐performance air cathodes in flexible ZABs in terms of catalyst properties, unique nanostructures, and morphologies are emphasized. Furthermore, effective architectures of air electrodes are discussed to highlight structural stability and charge/mass transports for improving battery performance. Finally, a perspective for designing durable and high‐power air electrodes for flexible ZABs is provided, aiming to summarize current challenges and possible solutions to commercialize the exciting battery technology eventually.

show abstract

Bifunctional oxygen electrocatalyst derived from photochlorinated graphene for rechargeable solid-state Zn-air battery

Cited by 26 publications

References 50 publications

Chlorinated Graphene via the Photodecomposition of Metal Chlorides

Chlorinated Graphene via the Photodecomposition of Metal Chlorides

Cobalt Nanoparticles Embedded in N, S Co‐Doped Carbon towards Oxygen Reduction Reaction Derived by in situ Reducing Cobalt Sulfide

Air Electrodes for Flexible and Rechargeable Zn−Air Batteries

Contact Info

Product

Resources

About