In situconstruction and post-electrolysis structural study of porous Ni2P@C nanosheet arrays for efficient water splitting
In situconstruction and post-electrolysis structural study of porous Ni2P@C nanosheet arrays for efficient water splitting
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用于高效分解水的多孔Ni2P@C纳米片阵列的原位构建和电解后结构研究
DOI：
10.1039/d0qi00570c
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发表时间：
2020
影响因子：
7
通讯作者：
Zheng Lansun
中科院分区：
文献类型：
--
作者：
Ma Min;Zheng Zhiping;Song Zhijia;Zhang Xibo;Han Xiao;Chen Hanming;Xie Zhaoxiong;Kuang Qin;Zheng Lansun
在这项研究中，一个多孔的混合催化剂与碳限制的Ni 2 P多孔纳米片阵列负载在泡沫镍（Ni2P@C NAs/NF）通过一步磷化的NiMOF前体的发展。值得注意的是，所制备的Ni2P@C NAs/NF表现出上级析氧反应（OER）性能，并且仅需要243 mV的小过电位来提供15 mA cm-2的电流密度，这超过了大多数报道的在碱性介质中工作的基于无贵金属的OER催化剂。这种惊人的结果可以归因于相互连接的大孔结构（促进质量传输和暴露丰富的可访问的催化中心）和调制的电子状态诱导的电子转移从碳基质的磷化镍（优化其固有的电催化性能）之间的协同效应。特别地，通过同时利用Ni2P@C NAs/NF作为阴极和阳极组装的碱性双电极水电解槽显示出相当大的水裂解活性和耐久性。此外，系统的电解后结构研究证实了在阳极Ni 2 P表面原位形成了γ-NiOOH膜。本工作为含镍催化剂材料的电解后结构提供了深入的见解，并将有助于三维多孔杂化纳米催化剂的设计。
In this study, a porous hybrid catalyst with carbon-confined Ni2P porous nanosheet arrays supported on nickel foam (Ni2P@C NAs/NF) was developed via a one-step phosphorization of NiMOF precursor. Remarkably, the as-fabricated Ni2P@C NAs/NF exhibited superior oxygen evolution reaction (OER) performance and only required a small overpotential of 243 mV to deliver a current density of 15 mA cm−2, which surpassed most reported noble-metal-free based OER catalysts working in alkaline media. Such striking results could be ascribed to the synergistic effect between the interconnected macroporous structure (facilitating mass transport and exposing rich accessible catalytic centers) and the modulated electronic states induced by electron transfer from the carbon matrix to nickel phosphide (optimizing its intrinsic electrocatalytic property). In particular, the alkaline two-electrode water electrolyser, which was assembled by simultaneously utilizing Ni2P@C NAs/NF as the cathode and anode, showed considerable water-splitting activity and durability. Additionally, systematic post-electrolysis structural study confirmed the in situ formation of a γ-NiOOH film on the Ni2P surface at the anode. This work provides a deep insight into the post-electrolysis structure of nickel-containing catalyst materials and would be helpful for the design of three-dimensional porous hybrid nanocatalysts.