Electronic structure modulation and morphological engineering of trifunctional Ni x Co y P electrode for ultrastable overall water splitting at 1 A cm-2 and efficient biomass oxidation valorization

被引:6
作者
Wang, Liyan [1 ]
Wang, Zhaokun [1 ]
Chu, Liang [1 ]
Huang, Zhi [1 ]
Yang, Mu [1 ]
Wang, Ge [1 ]
机构
[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Sch Mat Sci & Engn, Beijing Key Lab Funct Mat Mol & Struct Construct, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
Large current density; Surface reconstruction; Nanoneedle array; Bimetallic phosphides; Heterostructure; ELECTROCATALYSTS; NICOP;
D O I
10.1016/j.ijhydene.2024.03.305
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:830 / 841
页数:12
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