One-pot preparation of Ni3S2@3-D graphene free-standing electrode by simple Q-CVD method for efficient oxygen evolution reaction
One-pot preparation of Ni3S2@3-D graphene free-standing electrode by simple Q-CVD method for efficient oxygen evolution reaction
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DOI：
10.1016/j.ijhydene.2019.09.246
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发表时间：
2019-11
影响因子：
7.2
通讯作者：
Bolin Li;Zesheng Li;Feng He;Q. Pang;Peikang Shen
中科院分区：
文献类型：
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作者：
Bolin Li;Zesheng Li;Feng He;Q. Pang;Peikang Shen
高效的非贵金属析氧反应催化剂在电催化水裂解（ECWS）的实际应用中尤为重要。在此，基于一个简单的准化学气相沉积（Q-CVD）方法，我们制作了一个新的Ni3S2@3-D石墨烯独立电极，用于有效的OER应用。Ni3S2@3-D石墨烯结合了3-D石墨烯和Ni 3S 2在OER方面的优势，如界面催化位点多、孔结构丰富、N掺杂结构和良好的导电性。得益于这些有利的特性，Ni3S2@3-D石墨烯（尤其是900 °C样品）在碱性介质中表现出优异的OER性能，包括低起始电位（1.53 V）、在10 mA cm-2电流密度下305 mV的低过电位以及较小的塔菲尔斜率（50 mV dec-1）。该催化剂在电流密度增加30%的情况下，在10 mA cm-2的计时电流法响应48 h后也显示出稳定性。本工作为一锅法构建金属硫化物和石墨烯之间的杂化材料以提高非贵金属OER催化剂的电催化活性开辟了新途径。
Efficient non-noble metal catalysts for the oxygen evolution reaction (OER) are particularly important in the practical applications of electrocatalytic water splitting (ECWS). Herein, based on a simple quasi chemical vapor deposition (Q-CVD) method, we fabricate a newly Ni3S2@3-D graphene free-standing electrode for efficient OER applications. The Ni3S2@3-D graphene integrates the advantageous features of 3-D graphene and Ni3S2towards OER, such as more interfacial catalytic sites, pore-rich structure, N-doped structure and good electrical conductivity. Benefiting from the favorable features, the Ni3S2@3-D graphene (especially 900 °C sample) exhibits excellent OER performances in alkaline medium, which includes a low on-set potential (1.53 V), low overpotential of 305 mV at a current density of 10 mA cm−2, and a smaller Tafel slope (50 mV dec−1). This catalyst also shows ultrahigh stability after chronoamperometry response at 10 mA cm−2for 48 h with 30% increase in the current density. The present work opens a new approach for the one-pot construction of hybrid materials between metal sulfide and graphene to increase the electrocatalytic activity of non-noble metal OER catalysts.