Atomically ultrathin RhCo alloy nanosheet aggregates for efficient water electrolysis in broad pH range

Literature Information

Publication Date 2019-06-10
DOI 10.1039/C9TA05334D
Impact Factor 12.732
Authors

Yue Zhao, Juan Bai, Xin-Ru Wu, Pei Chen, Pu-Jun Jin, Hong-Chang Yao, Yu Chen


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Abstract

To date, noble metal nanostructures are the most efficient and stable electrocatalysts for water splitting. In this study, ultrathin RhCo alloy nanosheet aggregates (RhCo-ANAs) with atomic thickness (1.3 nm) were synthesized by a high-temperature cyanogel-reduction method. Moreover, the electrocatalytic performance of RhCo-ANAs for water splitting was investigated in acidic, neutral, and alkaline solutions. RhCo-ANAs exhibited higher activity and long-term stability for the anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER) than RuO2 nanoparticle (RuO2-NP) and Pt nanoparticle (Pt-NP) electrocatalysts. In particular, RhCo-ANAs only require the overpotential of 31 and 310 mV at the current density of 10 mA cm−2 for the HER and OER in a neutral solution, respectively. Furthermore, we directly grew RhCo-ANAs on carbon foam (CF) (termed as RhCo-ANAs/CF) with flexible property, which could be directly used as a cathode and an anode electrocatalyst for full water splitting in a two-electrode system. The two-electrode electrolyzer, assembled by RhCo-ANAs/CF as a bifunctional electrocatalyst, can provide the stable 10 mA cm−2 current density at 1.54 V potential in a neutral solution. Importantly, the symmetric RhCo-ANAs/CF‖RhCo-ANAs/CF electrolyzer has outstanding reversible switch ability for the HER and OER, which can complete fifty alternating operation by periodically switching the cathode and anode.

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Source Journal

Journal of Materials Chemistry A

Journal of Materials Chemistry A
CiteScore: 19.5
Self-citation Rate: 4.7%
Articles per Year: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

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