Electronic structure modulation and morphological engineering of trifunctional NixCoyP electrode for ultrastable overall water splitting at 1 A cm−2 and efffcient biomass oxidation valorization

Journal:International Journal of Hydrogen Energy

Key Words:Large current density Surface reconstruction Nanoneedle array Bimetallic phosphides Heterostructure

Abstract:The development of transition metal electrocatalysts with excellent HER, OER and HMFOR activity can accelerate the achievement of “carbon peaking and carbon neutrality”. Herein, we report a simple structure modulation and morphological strategy for constructing NixCoyP-3 nanoneedles array with superhydrophilic/ aerophobic surface. The small and well-dispersed nanoneedles can expose a larger electrochemical surface area. It has good mechanical stability, which can withstand the impact of violent bubbles at ampere-level current densities. NixCoyP-3 has a stronger H2O adsorption capacity than Ni2P, and can promote the adsorption and desorption of H* to facilitate the HER process. During the OER process, the formation of the NixCoyP-3/NixCoyOOH heterostructure is an important factor to stabilize oxygen evolution at ampere-level current densities. During the HMFOR process, NixCoyP-3 has a stronger HMF adsorption energy than Ni2P, and the generated FDCA can be desorbed from the NixCoyP-3 surface more easily. The overpotentials of the NixCoyP-3 are only 38.8 mV and 231.2 mV for HER and OER at 10 mA cm− 2 in alkaline medium. When in the 1.0 M KOH + 50 mM HMF, only 1.37 V was required to reach a current density of 10 mA cm− 2 of the NixCoyP-3 II NixCoyP-3 two-electrode system. NixCoyP-3 can drive 1000 mA cm− 2 overall water splitting for 100 h of stable operation in 1 M KOH, validating its potential in industrial hydrogen production.

Co-author:Zhaokun Wang,Liang Chu,Zhi Huang

First Author:Liyan Wang

Indexed by:Journal paper

Correspondence Author:Mu Yang,Ge Wang

Volume:64,

Page Number:830-841.

Translation or Not:no

Date of Publication:2024-03-24

Included Journals:SCI