Activating and optimizing the activity of NiCoP nanosheets for electrocatalytic alkaline water splitting through the V doping effect enhanced by P vacancies

Abstract

We design V doped NiCoP nanosheets with P vacancies induced by Ar plasma as a cost-effective and bifunctional electrocatalyst for overall water splitting.

Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

“…The designed H‐CoMoO 4 material exhibited excellent electrocatalytic performances for HER (42 mV@10 mA cm −2 ), OER (295 mV@10 mA cm −2 ), and overall water‐splitting (1.56 V@10 mA cm −2 ). In addition to testing oxygen vacancy, Qi and co‐workers [ 202 ] illustrated that phosphorous vacancy could also effectively promote electrocatalytic performance for overall water‐splitting. As illustrated in Figure 18d, NiCoP nanosheet array on carbon cloth was prepared by a typical hydrothermal process followed by a phosphorizaion process, and then the material was allowed to absorb V 3+ for 10 min.…”

“…Reproduced with permission. [ 202 ] Copyright 2019, The Royal Society of Chemistry. e) Schematic illustration of HER (up) and OER (down) on the Fe2 site of the δ‐FeOOH surface with iron vacancy.…”

One-step conversion of tannic acid-modified ZIF-67 into oxygen defect hollow Co3O4/nitrogen-doped carbon for efficient electrocatalytic oxygen evolution

“…45 The ECSA can be determined using the C dl . 46 CV curves were obtained in the non-faradaic region to calculate the C dl . As shown in Fig.…”

Large‐Size, Porous, Ultrathin NiCoP Nanosheets for Efficient Electro/Photocatalytic Water Splitting

“…[ 3,18,19 ] The catalytic activity of Ni x Co y P z is closely related to its surface properties and electronic structures, and can be improved by increasing the quantity of exposed active sites and optimizing its electronic structures by rationally tuning the morphology, surface area, defects and composition of Ni x Co y P z . [ 20–26 ] For example, Liu and co‐workers adopted controllable oxygen doping strategy to obtain an efficient NiCoP electrocatalyst with a hydrogen adsorption energy close to zero and abundant exposed active sites. [ 27 ] Qiu and co‐workers used Cu 2 O cubes as sacrificial templates to prepare uniformly dispersed nanocage‐like Ni‐Co bimetal phosphides with abundant active sites, exhibiting outstanding electrocatalytic performance and long‐term stability.…”