Karst landform-featured monolithic electrode for water electrolysis in neutral media

Abstract

The development of cheap and efficient electrodes for water splitting is an ongoing challenge.

Towards Long‐Term Photostability of Nickel Hydroxide/BiVO4 Photoanodes for Oxygen Evolution Catalysts via In Situ Catalyst Tuning

“…This indicated that photocorrosion was suppressed with the addition of Fe 2+ in the electrolyte. The initial increased current density after adding Fe 2+ can be ascribed to that ferric ions were incorporated into the surface of NiOOH OEC layer, which was favorable to the electrocatalytic activity and photoelectrochemical performance . This was consistent with Choi et al.…”

In situ construction of Co/N/C-based heterojunction on biomass-derived hierarchical porous carbon with stable active sites using a Co-N protective strategy for high-efficiency ORR, OER and HER trifunctional electrocatalysts

“…To drive a current density of 10 mA cm À2 , an overpotential of only 0.21 V is required for the Co 2 N 0.67 -BHPC, lower than Co 2 O 3 -BHPC (0.32 V). Also, the Tafel slope of the catalysts being regarded as one of the great tools to speculate the rate determining step of HER process [40]. As shown in Fig.…”

Local probe investigation of electrocatalytic activity

“…The SECM images indicate a high activity in the valley areas, which was conrmed by the topographical image as well. 215 The same electrocatalyst exhibited good activity towards the OER as well and this performance is attributed to the karst landform structure, which seems to ease the mass diffusion and to provide sufficient catalytic sites. 215 SECM was employed as well for the investigation of photogenerated hydrogen at a 1,2-dichloroethane/water (DCE/W) interface by Jedraszko et al 216 During the HER, decamethylruthenocene (DMRc) is formed as a by-product during the hydrogen evolution, and then serves as an electron donor, which permits a continuous HER.…”

“…215 The same electrocatalyst exhibited good activity towards the OER as well and this performance is attributed to the karst landform structure, which seems to ease the mass diffusion and to provide sufficient catalytic sites. 215 SECM was employed as well for the investigation of photogenerated hydrogen at a 1,2-dichloroethane/water (DCE/W) interface by Jedraszko et al 216 During the HER, decamethylruthenocene (DMRc) is formed as a by-product during the hydrogen evolution, and then serves as an electron donor, which permits a continuous HER. 216 The SECM setup consisted of two Pt electrodes separated by only 50 mm from each other through a liquid/liquid interface, in order to ensure an efficient generation of DMRc by DMRc + reduction.…”

“…213 This was done by Kumar et al 214 who combined MoS 2 NPs of the T1 phase with graphene oxide (GO) or reduced graphene oxide (rGO) in which case both composites exhibited comparable HER activity to the state-of-the-art Pt/C. 214 On the other hand, nickel foams with a karst landform structure were studied for their HER activity by Gao et al 215 through SG/TC mode, a Pt nanoelectrode and Si substrate. The SECM images indicate a high activity in the valley areas, which was conrmed by the topographical image as well.…”