Graphdiyne/CdSe quantum dot heterostructure for efficient photoelectrochemical water oxidation

Abstract

The design and synthesis of efficient catalysts for water oxidation is of significant importance. Here a type of graphdiyne (GDY) based heterostructure of CdSe/GDY was synthesized through a facile in-situ growth strategy including the first growth of GDY nanosheet arrays followed by the nucleation and growth of CdSe quantum dots (QDs) featuring well-dispersed CdSe QDs with uniform size around 3 nm. Experimental results revealed that GDY could effectively induce the growth and well-dispersion of CdSe QDs on GDY, forming new heterostructures and leading to the maximized number of active sites, the reduced recombination of photo-induced electron and hole pairs, and facilitated charge transfer behavior. Benefiting from these superior advantages, CdSe/GDY achieves greatly enhanced catalytic activity toward water oxidation under light illumination, with a small overpotential of 155 mV at the current density of 10 mA cm−2, which is better than those of pristine CdSe QDs and GDY.

2D graphdiyne: an emerging carbon material

“…The results showed that the CdSe/GDY as grown on GDY can achieve greatly enhanced photoactivity and oxygen production under light illumination. 131 Inspired by the controllable synthesis of GDY-based quantum dot catalysts, metal clusters have also been successfully loaded on GDY for efficient catalysis. Gao et al 132 grew VRu 0.027 O x clusters (2.75 AE 0.04 nm) that were uniformly dispersed on the surface of GDY without agglomeration.…”

“…The results showed that the CdSe/GDY as grown on GDY can achieve greatly enhanced photoactivity and oxygen production under light illumination. 131…”

Probing Strain-Induced Effects on Performance of Low-Dimensional Hybrid Perovskites for Solar Energy Harvesting

“…Hybrid organic–inorganic perovskites are a class of materials whose power conversion efficiency (PCE) in solar cell applications has dramatically increased from 3.8% in 2009 to 25.7% in 2020. − These improvements have spurred intensive research to break the 30% PCE barrier, approach the Shockley–Queisser limit, increase the stability and longevity of the perovskites, reduce usage of environmentally problematic compounds, and relevant to this study, expand control over the materials at the level of electronic structure. − Two-dimensional (2D) materials are unmatched in their ability to realize finely tunable optoelectronic properties through simple changes such as pressure modification, modulation in the number of layers, and exchange of interfacing materials. − This flexibility has led to successful application of 2D perovskites (2DPKs) as efficient light emitters, photodetectors, and hybrid photovoltaic (PV) and thermoelectric (TE) materials. − The 2D analogues of standard AB X 3 bulk hybrid perovskites (where A is an organic cation, B is Pb, Sn, or Ge, and X is a halogen anion) take the form of A′ 2 A n –1 B n X 3 n +1 . In hybrid 2DPKs, A′ is an organic cation generally of longer length than A, which acts as a spacer between the 2D or quasi-2D perovskite layers, n is the number of layers, and the identity of A, B, and X remains the same.…”

Fabrication of graphdiyne and its analogues for photocatalytic application

“…84,85 Lastly, the ultrathin thickness of the GDY layers greatly shortens the transfer distance of the charge carriers to their surface, efficiently improving the separation efficiency of photo generated charge carriers. 86,87 Heterojunction architectures based on GDY materials is Up to now, numerous experimental efforts have been devoted into the development of GDY-based heterojunction with other semiconductors, such as MoS 2 , 88,89 TiO 2 , 90,91 g-C 3 N 4 , 92 NiFe layered double hydroxide (LDH), 93,94 CdS, 95,96 CuS, 97 CdSe, 98 CoS, 99,100 graphene 101,102 and so on. Li 0 s group realized in-situ growth of ultrathin molybdenum disulfide (MoS 2 ) on the surface of electron-rich GDY using a facile solvothermal strategy.…”

“…Up to now, numerous experimental efforts have been devoted into the development of GDY‐based heterojunction with other semiconductors, such as MoS 2 , 88,89 TiO 2 , 90,91 g‐C 3 N 4 , 92 NiFe layered double hydroxide (LDH), 93,94 CdS, 95,96 CuS, 97 CdSe, 98 CoS, 99,100 graphene 101,102 and so on. Li′s group realized in‐situ growth of ultrathin molybdenum disulfide (MoS 2 ) on the surface of electron‐rich GDY using a facile solvothermal strategy 103 .…”