Superhydrophilic Graphdiyne: Superhydrophilic Graphdiyne Accelerates Interfacial Mass/Electron Transportation to Boost Electrocatalytic and Photoelectrocatalytic Water Oxidation Activity (Adv. Funct. Mater. 16/2019)

Abstract

In article number https://doi.org/10.1002/adfm.201808079, Jin Zhang, Li‐Zhu Wu, and co‐workers describe the first superhydrophilic graphdiyne (GDY) electrode fabricated via air plasma for water oxidation. The resultant superhydrophilic CoAl‐LDH/GDY electrode shows superior oxygen evolution performance in both electrocatalytic and photoelectrocatalytic systems, which benefits from the facilitated interfacial mass/electron transportation by superhydrophilic GDY.

Recent Advance of Transition‐Metal‐Based Layered Double Hydroxide Nanosheets: Synthesis, Properties, Modification, and Electrocatalytic Applications

“…constructed CoAl–LDH/graphdiyne (CoAl–LDH/GDY) electrocatalysts/electrode with super‐wettable surface to increase the attractive ability toward H 2 O molecules. [ 95 ] The super‐wettability of CoAl–LDH/GDY was attributed to the hydrophilic oxygenic groups on GDY surface, which were introduced via plasma technology. According to DFT calculations, GDY with hydrophilic –COOH group on surface showed higher electron density, indicating that superhydrophilic GDY can be easily assembled with CoAl–LDH nanosheets.…”

Advance in Using Plasma Technology for Modification or Fabrication of Carbon‐Based Materials and Their Applications in Environmental, Material, and Energy Fields

“…Li et al. [ 123 ] prepared superhydrophilic graphdiyne (GDY) electrodes by air plasma processing to support cobalt/aluminum layered double hydroxide (CoAl‐LDH/GDY) catalysts. The OER activity of CoAl‐LDH/GDY showed that only 258 mV overpotential was required to reach a current density 10 mA cm −2 , with a turnover frequency (TOF) of 0.60 s −1 at an overpotential of 300 mV.…”

Oxygen Evolution Catalysts at Transition Metal Oxide Photoanodes: Their Differing Roles for Solar Water Splitting

“…c) J–V curves of hydrophobic GDY/BiVO 4 (purple), superhydrophilic GDY/BiVO 4 (blue), hydrophobic CoAl‐LDH/GDY/BiVO 4 (red), and superhydrophilic CoAl‐LDH/GDY/BiVO 4 (black). [ 135 ] Reproduced with permission. [ 135 ] Copyright 2019, Wiley‐VCH.…”

“…Graphdiyne (GDY) turns superhydrophilic after air‐plasma treatment. [ 135 ] When attached to cobalt–aluminum layered double hydroxide (CoAl‐LDH) electrostatically, electrocatalytic and photoelectrocatalytic water oxidation rates are substantially raised compared to its hydrophobic counterpart (Figure 21b,c). The improvement in the PEC response by turning CoAl‐LDH/GDY/BiVO 4 superhydrophilic (≈1.34 times J ph at +1.2 V RHE ) is noticeably better than only turning GDY/BiVO 4 superhydrophilic (≈1.2 times J ph at +1.2 V RHE ), which means GDY is capable of activating more sites of CoAl‐LDH.…”