双功能
纳米结构
电化学
催化作用
电解质
分解水
纳米技术
纳米线
普鲁士蓝
无机化学
电极
析氧
电子转移
氢氧化物
电催化剂
材料科学
阳极
吸附
化学工程
化学
工程类
光化学
光催化
物理化学
生物化学
作者
Guoqing Huang,Xinglei Gao,Yuhua Liu,Shisheng Yuan,Yuanhao Zhang,Nan Li,Shubo Jing
标识
DOI:10.1016/j.electacta.2023.142219
摘要
In this study, a hierarchical cactus-like nanostructure with cobalt doped iron disulfide (Co-FeS2) needle nanowires as trunks and nickel-iron layered double hydroxide (NiFe-LDH) nanosheets as branches was constructed as a self-supporting electrode for overall water splitting in alkaline electrolytes. A low electron density NiFe-LDH derived from the strong electronic interaction between sulfides and NiFe-LDH is remarkably effective in facilitating the adsorption of H2O and OH−, while the presence of Co atoms in FeS2 facilitates the hydrogen adsorption. Such a synergetic effect improved the HER performance in alkaline electrolytes significantly. In terms of the OER process, the Fe/Co oxyhydroxides produced from in situ phase transition from Co-FeS2 in conjunction with NiFe-LDH endow the electrode with excellent OER activity. Furthermore, the Co-FeS2 needle nanowires with metal-like conductivity allow for rapid electron transfer during electrochemical processes, and the hierarchical structure exposes substantial active sites and facilitates electrolyte penetration. In alkaline media, the electrode demonstrated outstanding HER and OER catalytic activity, requiring small overpotentials of 131 mV and 220 mV to reach current densities of 10 mA cm−2 and 20 mA cm−2, respectively. Moreover, it only needed 1.58 V to drive 10 mA cm−2 when utilized simultaneously as both cathode and anode for overall water splitting.
科研通智能强力驱动
Strongly Powered by AbleSci AI