Institute of Special Materials and Technology, Fudan University , Shanghai 200433, P. R. China.
Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
ACS Appl Mater Interfaces. 2017 Sep 20;9(37):31887-31896. doi: 10.1021/acsami.7b09282. Epub 2017 Sep 7.
Synthesis of highly efficient and robust catalysts with earth-abundant resources for overall water splitting is essential for large-scale energy conversion processes. Herein, a series of highly active and inexpensive Co-Ni-P films were fabricated by a one-step constant current density electrodeposition method. These films were demonstrated to be efficient bifunctional catalysts for both H and O evolution reactions (HER and OER), while deposition time was deemed to be the crucial factor governing electrochemical performance. At the optimal deposition time, the obtained Co-Ni-P-2 catalyst performed remarkably for both HER and OER in alkaline media. In particular, it requires -103 mV overpotential for HER and 340 mV for OER to achieve the current density of 10 mA cm, with corresponding Tafel slopes of 33 and 67 mV dec. Moreover, it outperforms the Pt/C//RuO catalyst and only needs -160 mV (430 mV) overpotential for HER (OER) to achieve 200 mA cm current density. Co-Ni-P electrodes were also conducted for the proof-of-concept exercise, which were proved to be flexible, stable, and efficient, further opening a new avenue for rapid synthesis of efficient, flexible catalysts for renewable energy resources.
具有丰富资源的高效和稳定催化剂的合成对于大规模能源转化过程至关重要。在此，通过一步恒电流密度电沉积法制备了一系列高效且廉价的 Co-Ni-P 薄膜。这些薄膜被证明是 H 和 O 析出反应（HER 和 OER）的高效双功能催化剂，而沉积时间被认为是决定电化学性能的关键因素。在最佳沉积时间下，所获得的 Co-Ni-P-2 催化剂在碱性介质中对 HER 和 OER 均表现出优异的性能。特别是，它在 HER 中仅需 -103 mV 的过电势和 340 mV 的 OER 即可达到 10 mA cm 的电流密度，相应的塔菲尔斜率分别为 33 和 67 mV dec。此外，它优于 Pt/C//RuO 催化剂，仅需 -160 mV（430 mV）的过电势即可达到 200 mA cm 的电流密度。Co-Ni-P 电极也进行了概念验证实验，证明了它们具有柔韧性、稳定性和高效性，为可再生能源资源的高效、灵活催化剂的快速合成开辟了新途径。
