Xie Ning, Ma Dong-Dong, Wu Xin-Tao, Zhu Qi-Long
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS), Fuzhou 350002, China.
Nanoscale. 2021 Jan 28;13(3):1807-1812. doi: 10.1039/d0nr07262a.
Constructing high-performance and cost-effective electrocatalysts for water oxidation, particularly for overall water splitting, is extremely needed, whereas still challenging. Herein, based on an economical and facile one-step surface sulfurization strategy, a three-dimensional nanostructure with uniform Fe-doped Ni3S2 nanoparticle arrays tightly implanted on nickel foam (Fe-doped Ni3S2-NF) has been fabricated for the extremely efficient electrochemical oxygen evolution reaction (OER). Owing to the unique electronic structure modulation between Ni and Fe sites, and high interfacial charge communication during the electrocatalytic process, the optimal Fe-doped Ni3S2-NF electrode shows an excellent OER activity with ultralow overpotentials of 166 and 235 mV at 10 and 100 mA cm-2 in alkaline solution, respectively, remarkably outcompeting the benchmark RuO2/NF and the overwhelming majority of the reported electrocatalysts. Furthermore, for overall water splitting, the Fe-doped Ni3S2-NF electrode as a bifunctional electrocatalyst assembled in a two-electrode device requires merely 1.56 V to gain a current density of 10 mA cm-2. This study presents a universal surface engineering strategy to conveniently and economically remould commercial metal materials into efficient electrocatalysts for various electrochemical reactions.
构建用于水氧化，特别是用于全水分裂的高性能且具有成本效益的电催化剂极为必要，但仍具有挑战性。在此，基于一种经济且简便的一步表面硫化策略，制备了一种三维纳米结构，其具有紧密植入泡沫镍上的均匀铁掺杂Ni3S2纳米颗粒阵列（Fe掺杂Ni3S2-NF），用于极其高效的电化学析氧反应（OER）。由于Ni和Fe位点之间独特的电子结构调制以及电催化过程中的高界面电荷通信，最佳的Fe掺杂Ni3S2-NF电极在碱性溶液中于10和100 mA cm-2时分别表现出优异的OER活性，过电位超低，分别为166和235 mV，明显优于基准RuO2/NF以及绝大多数已报道的电催化剂。此外，对于全水分裂，作为双功能电催化剂组装在两电极装置中的Fe掺杂Ni3S2-NF电极仅需1.56 V即可获得10 mA cm-2的电流密度。本研究提出了一种通用的表面工程策略，可方便且经济地将商用金属材料重塑为用于各种电化学反应的高效电催化剂。
