Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||A comparative study of metal (Ni, Co, or Mn)-borate catalysts and their photodeposition on rGO/ZnO nanoarrays for photoelectrochemical water splitting|
|Citation:||Journal of Materials Chemistry A, 2018; 6(47):24149-24156|
|Publisher:||Royal Society of Chemistry|
|Huayang Zhang, Wenjie Tian, Yunguo Li, Hongqi Sun, Moses O. Tadéa and Shaobin Wang|
|Abstract:||Feasible and efficient photoelectrochemical (PEC) water splitting demands a rational integration of solar light absorbers with active electrocatalysts. Herein, we first compare three amorphous metal-borates (M-Bi, M = Ni, Co, Mn) as low-cost electrocatalysts, among which Mn-Bi is proposed for the first time for fabrication of new PEC devices for oxygen evolution reaction (OER). Density functional theory (DFT) calculations compared the catalytic activity of the effective structures in M-Bi and found that NiO6 possesses kinetically the lowest overall OER energy barrier. Experimentally, M-Bi thin layers were self-assembled on reduced graphene oxide (rGO) linked ZnO nanorod arrays respectively, to form a highly efficient ternary PEC system (M-Bi/rGO/ZnO) using a modified photodeposition method. rGO facilitates the fast charge separation in light-absorbing ZnO NAs, while M-Bi (M = Ni, Co, Mn) can improve the kinetics of OER. In accordance with DFT results, Ni-Bi serves as the most active electrocatalyst in such a PEC device, followed by Co-Bi and Mn-Bi. Compared to ZnO, the photoelectroconversion efficiency is elevated by approximately 4 times on Ni-Bi/rGO/ZnO, with its onset potential migrated by 0.17 V in the cathodic direction under one sun illumination.|
|Rights:||This journal is © The Royal Society of Chemistry 2018|
|Appears in Collections:||Chemical Engineering publications|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.