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

文献情報

出版日 2019-06-10

DOI 10.1039/C9TA05334D

インパクトファクター 12.732

著者

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

原文を見る

要旨

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.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

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