高结晶度硼酸镍纳米棒的制备及其电催化析氧性能研究

氢能被视为21世纪最具发展潜力的能源. 电解水制氢具有诸多优点，如原料来源广泛、操作简便、产品纯度高、无污染，已成为最具有应用前景的方法之一，但其阳极氧析出反应动力学缓慢，严重制约电解水制氢的效率. 因此，发展氧析出电催化剂尤为重要. 本文利用高温煅烧法制备了硼酸镍纳米棒，长度约为2 μm，直径约为200 nm. 与文献报道的低结晶度或无定型硼酸盐析氧催化剂不同，硼酸镍纳米棒的结晶度较高，并且具有较好的OER催化活性和稳定性. 其催化活性可以通过与其他导电材料复合或进一步减小其尺寸等方式提升.

Highly Crystalline Nickel Borate Nanorods as Oxygen Evolution Reaction Electrocatalysts

Hydrogen energy, a kind of clean and renewable energy, is considered to be the solution to the problems of energy crisis and environmental deterioration. Electrochemical water splitting is an efficient and promising technology for the production of high-purity hydrogen. However, oxygen evolution reaction (OER) at the anode of water electrolyzer limits the efficiency of water splitting due to the high overpotential. Therefore, the challenges still remain for the exploration of highly active, stable and low-cost catalysts with superior activity for OER. Herein, nickel borate nanorods with high crystallinity were prepared via high-temperature calcination. The as-obtained nickel borate nanorods with 2 μm in length and 200 nm in diameter exhibited excellent OER activity in terms of an overpotential of 373 mV at 10 mA·cm^-2, even though their capacitance value is extremely low (0.03 mF·cm^-2), which could be further improved by coupling with other conductive materials or decreasing the size of nickel borate.