Iron-substituted Co-Ni phosphides immobilized on Ni foam as efficient self-supported 3D hierarchical electrocatalysts for oxygen evolution reaction
Iron-substituted Co-Ni phosphides immobilized on Ni foam as efficient self-supported 3D hierarchical electrocatalysts for oxygen evolution reaction
复制标题
固定在泡沫镍上的铁取代钴镍磷化物作为高效自支撑 3D 分层电催化剂用于析氧反应
DOI：
10.1016/j.ijhydene.2019.02.053
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发表时间：
2019
影响因子：
7.2
通讯作者：
Yang En-Cui
中科院分区：
文献类型：
--
作者：
Zhou Chenmin;Mu Jianshuai;Qi Yu-Feng;Wang Qian;Zhao Xiao-Jun;Yang En-Cui
动力学缓慢的析氧反应(OER)显著阻碍了电催化析氢水的分解。因此，开发高效、持久稳定的非贵金属OER电催化剂对大规模电催化裂水是必要的和具有挑战性的。本论文通过水热处理和磷化处理，很容易地在泡沫镍上制备了一系列铁取代的钴镍磷化物(FeCoNi-P/NFS)。这些电催化剂的化学组成、晶体结构、电子结构以及表面形貌都与铁的取代率密切相关。更有趣的是，以等摩尔比的铁和钴为前驱体制备的FeCoNi-P/NF-2纳米片阵列表现出最好的OER性能，在1.0MKOH条件下，过电位为266mV，产生的电流密度为50mA/cm−，塔菲尔斜率为61.2mV/−，可与报道的最先进的OER电催化剂相媲美。此外，FeCoNi-P/NF-2纳米片阵列还表现出了令人满意的60h以上的长期耐久性。电催化剂优异的OER活性本质上归功于杂原子取代和独特的三维分层形貌，这大大提高了电导率，提供了更多的活性中心，促进了有效的电荷转移能力。
Electrocatalytic water splitting for hydrogen evolution is significantly impeded by the kinetically sluggish oxygen evolution reaction (OER). Thus, the development of highly efficient and durably stable non-noble-metal OER electrocatalyst is necessary and challenging for the large-scale electrocatalytic water splitting. Herein, a series of iron-substituted cobalt-nickel phosphides grown on Ni foam (FeCoNi-P/NFs) were easily prepared though successive hydrothermal and phosphorization treatments. The chemical compositions, crystalline and electronic structures as well as surface morphologies of these resulting electrocatalysts are strongly related with the iron substitution ratio. More interestingly, the FeCoNi-P/NF-2 nanosheet arrays prepared from equivalent molar ratio of iron and cobalt precursors exhibit the best OER performance with a low overpotential of 266 mV to produce a current density of 50 mA cm−2and a low Tafel slope of 61.2 mV dec−1in 1.0 M KOH condition, which is comparable to the reported state-of-the-art OER electrocatalysts. Additionally, the FeCoNi-P/NF-2 nanosheet arrays also show satisfactory long-term durability over 60 h. The superior OER activity of the electrocatalyst is essentially attributed to the heteroatomic substitution and the unique three-dimensional hierarchical morphology, which greatly increase the electrical conductivity, afford more active sites and facilitate the efficient charge transfer ability.