Novel Ni2P-microporous nickel phosphite supported on nitrogen-doped graphene composite electrocatalyst for efficient hydrogen evolution reaction
Novel Ni2P-microporous nickel phosphite supported on nitrogen-doped graphene composite electrocatalyst for efficient hydrogen evolution reaction
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DOI：
10.1088/1361-6528/abdd5d
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发表时间：
2021-12-10
期刊：
影响因子：
3.5
通讯作者：
Wu, Jian
中科院分区：
文献类型：
--
作者：
Deng, Ruxin;Lin, Lingling;Wu, Jian
过渡金属磷化物被认为是一种很有前途的析氢反应电催化剂。通过构建微孔结构可以促进有效的传质机制。另外，引入碳材料作为载体，形成界面相互作用，有利于提高电子电导率，从而进一步提高催化活性。在这项工作中，氮掺杂石墨烯（NGO）负载的微孔磷化镍-亚磷酸镍（Ni 2 P-Ni-11（HPO 3）（8）（OH）（6）@NGO，Ni 2 P-MPH @NGO），其中Ni 2 P纳米颗粒均匀地填充Ni-11（HPO 3）（8）（OH）（6）的微孔，然后通过简单的两步法负载在二维NGO上，与碳纳米管和石墨烯作为碳基载体相比，优化后的Ni 2 P-MPH @NGO催化剂表现出优异的HER性能，具有较小的过电位、较低的Tafel斜率和在酸性条件下的长期催化稳定性。结果表明，NGO能有效提高Ni 2 P-MPH @NGO的催化活性。结果表明，Ni-11（HPO 3）（8）（OH）（6）微孔结构与NGO的协同作用有效提高了Ni 2 P-MPH @NGO复合催化剂的催化活性，为设计新型低成本、高效率的HER电催化剂提供了一种有前景的策略。
Transition metal phosphides are regarded as promising hydrogen evolution reaction (HER) electrocatalysts for water splitting. An efficient mass-transfer mechanism can be promoted through constructing microporous structures. In addition, introducing carbon materials as carriers to form interface interactions is beneficial for increasing electronic conductivity so as to promote the catalytic activity further. In this work, a nitrogen-doped graphene (NGO)-supported microporous nickel phosphide-nickel phosphite (Ni2P-Ni-11(HPO3)(8)(OH)(6)@NGO, Ni2P-MPH@NGO), where Ni2P nanoparticles uniformly fill the micropores of Ni-11(HPO3)(8)(OH)(6) and then are supported on two-dimensional NGO via a simple two-step method, has been studied as a novel efficient electrocatalyst for HER. Compared with carbon nanotubes and graphene as carbon-based carriers, the optimized Ni2P-MPH@NGO catalyst shows excellent HER performance with a smaller overpotential, lower Tafel slope and long-term catalytic durability under acid conditions. The results demonstrate that NGO can enhance the catalytic activity of Ni2P-MPH@NGO efficiently. The results show that the synergistic effect of the microporous structure of Ni-11(HPO3)(8)(OH)(6) and NGO effectively improves the catalytic activity of the Ni2P-MPH@NGO composite catalyst, which provides a promising strategy for the design of a new low-cost and high-efficiency HER electrocatalysts.