Identifying dual functions of rGO in a BiVO₄/rGO/NiFe-layered double hydroxide photoanode for efficient photoelectrochemical water splitting

Abstract

<p>To enhance surface reaction kinetics for oxygen evolution reaction, nanoporous BiVO₄ photoanodes are modified by rGO and NiFe-layered double hydroxides, leading to an enhanced photocurrent density of 3.26 mA cm⁻² under AM 1.5 G illumination.</p>

Recent Progress in LDH@Graphene and Analogous Heterostructures for Highly Active and Stable Photocatalytic and Photoelectrochemical Water Splitting

“…RHE under AM 1.5 G illuminations for 60 min. They confirmed that rGO could support the growth of NiFe−LDH over BiVO 4 photoanode at medium potential and the adaptation of rGO and NiFe−LDH, causes boasted photocurrent density and stability of BiVO 4 /rGO/NiFe−LDH photoanode [159] …”

“…The PC/PEC stability of heterostructure semiconductor photocatalyst is of significant aspect to measure their efficacy of recyclability in real time applications, which is normally calculated by consecutive cyclic tests. After the specific water splitting experiment, the collected catalyst is reused as the clean starting sample for numerous cycles under the same experimental environment [159] . Sometimes during recycling test of catalyst, the PC/PEC water splitting performance may decline and the stability test is not properly evaluated owing to the influence of other factors, such as blocking of active site, sample loss during recycling, adsorption of intermediates states, or surface alteration.…”

“…In difference, Chen et al. verified that rGO could facilitate the growth of NiFe−LDH over BiVO 4 photoanode by soft onset potential [159] . As more negative potential is harmful to PEC performance, so rGO could positively shift the electrodeposition potential of NiFe−LDH (−0.1 V vs .…”

“…Copyright 2016, Royal Society of Chemistry. (b) PEC mechanism over BiVO 4 /rGO/NiFe−LDH [159] . Copyright 2020, Royal Society of Chemistry.…”

Remarkable synergy of borate and interfacial hole transporter on BiVO4 photoanodes for photoelectrochemical water oxidation

“…[53][54][55] In the abovementioned two methods, LDHs either grow homogenously in-situ and completely cover the surface of BiVO 4 as oriented nanosheets or form a layer wrapped around the BiVO 4 particles. However, BiVO 4 is sensitive to the pH of electroplating solution and the applied potential during electrolysis; [56][57][58] and the relatively high temperature of the hydrothermal process might cause detrimental surface etching on BiVO 4 . 59 Considering the instability of borate treated BiVO 4 , 35 it is clearly challenging to maintain the preenhanced PEC activity of B-BiVO 4 when loading OECs.…”