Wei Yong, Fu Jijiang, Song Hao, Zhang Ben, Pi Chaoran, Xia Lu, Zhang Xuming, Gao Biao, Zheng Yang, Chu Paul K
The State Key Laboratory of Refractories and Metallurgy, Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology Wuhan 430081 China
Department of Physics, Department of Materials Science and Engineering, City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China.
RSC Adv. 2019 Apr 15;9(21):11676-11682. doi: 10.1039/c9ra01184f. eCollection 2019 Apr 12.
Efficient and stable non-precious metal based electrocatalysts are crucial to the hydrogen evolution reaction (HER) in renewable energy conversion. Herein, Co P nanoparticles (NPs) are uniformly embedded in N-doped TiO nanotube arrays (Co P/N-TiO NTAs) by low-temperature phosphorization of the precursor of metallic cobalt NPs embedded in N-doped TiO NTAs (Co/N-TiO NTAs) which were fabricated by phase separation of CoTiO NTAs in ammonia. Owing to the abundant exposed surface active sites of Co P NPs, tight contact between the Co P NPs and TiO NTAs, fast electron transfer in N-doped TiO, and channels for effective diffusion of ions and H bubbles in the tubular structure, the Co P/N-TiO NTAs have excellent electrocatalytic activity in HER exemplified by a low overpotential of 180 mV at 10 mA cm and small Tafel slope of 51 mV dec in 0.5 M HSO. The catalyst also shows long-term cycling stability and is a promising non-precious metal catalyst for HER.
高效且稳定的非贵金属基电催化剂对于可再生能源转换中的析氢反应（HER）至关重要。在此，通过对嵌入氮掺杂TiO纳米管阵列（Co/N-TiO NTAs）中的金属钴纳米颗粒前驱体进行低温磷化处理，将CoP纳米颗粒（NPs）均匀地嵌入到N掺杂TiO纳米管阵列（CoP/N-TiO NTAs）中，Co/N-TiO NTAs是通过CoTiO NTAs在氨中相分离制备的。由于CoP NPs具有丰富的表面活性位点、CoP NPs与TiO NTAs之间紧密接触、氮掺杂TiO中快速的电子转移以及管状结构中离子和H气泡有效扩散的通道，CoP/N-TiO NTAs在HER中具有优异的电催化活性，在0.5 M H₂SO₄中，在10 mA cm⁻²时过电位低至180 mV，塔菲尔斜率小至51 mV dec⁻¹。该催化剂还表现出长期循环稳定性，是一种有前景的用于HER的非贵金属催化剂。
