Liu Baocang, Huo Lili, Gao Zhiqing, Zhi Guolei, Zhang Geng, Zhang Jun
College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, P. R. China.
Inner Mongolia Key Lab of Nanoscience and Nanotechnology, Inner Mongolia University, Hohhot, 010021, P. R. China.
Small. 2017 Jun;13(21). doi: 10.1002/smll.201700092. Epub 2017 Apr 10.
Developing high-performance but low-cost hydrogen evolution reaction (HER) electrocatalysts with superior activity and stability for future sustainable energy conversion technologies is highly desired. Tuning of microstructure, configuration, and chemical composition are paramount to developing effective non-noble electrocatalysts for HER. Herein, a universal "nanocasting" method is reported to construct graphene decorated with uniform ternary (CoP) -(FeP) (0 ≤ x ≤ 1) nanorods hybrids with different chemical compositions [(CoP) -(FeP) -NRs/G] as a highly active and durable nonprecious-metal electrocatalyst for the HER. The optimized (CoP) -(FeP) -NRs/G electrocatalyst exhibits overpotentials of as low as 57 and 97 mV at 10 mA cm , Tafel slopes of 52 and 62 mV dec , exchange current densities of 0.489 and 0.454 mA cm , and Faradaic efficiency of nearly 100% in acidic and alkaline media, respectively. More importantly, this electrocatalyst also exhibits high tolerance and durability in a wide pH range and keeps catalytic activity for at least 3000 cycles and 24 h of sustained hydrogen production. The excellent catalytic performance of the (CoP) -(FeP) -NRs/G electrocatalyst may be ascribed to its unique mesoporous structure and strong synergistic effect between CoP and FeP. Thus, the work provides a feasible way to fabricate cheap and highly efficient electrocatalyst as alternatives for Pt-based electrocatalysts for HER in electrochemical water splitting.
开发具有卓越活性和稳定性的高性能低成本析氢反应（HER）电催化剂，对于未来可持续能源转换技术而言是非常必要的。调整微观结构、构型和化学成分对于开发有效的HER非贵金属电催化剂至关重要。在此，报道了一种通用的“纳米铸造”方法，用于构建由均匀的三元（CoP）-(FeP)（0≤x≤1）纳米棒杂化物修饰的石墨烯[(CoP)-(FeP)-NRs/G]，作为一种用于HER的高活性和耐用的非贵金属电催化剂。优化后的（CoP）-(FeP)-NRs/G电催化剂在酸性和碱性介质中，在10 mA cm 时的过电位分别低至57和97 mV，塔菲尔斜率分别为52和62 mV dec ，交换电流密度分别为0.489和0.454 mA cm ，法拉第效率接近100%。更重要的是，这种电催化剂在宽pH范围内还表现出高耐受性和耐久性，并且在至少3000次循环和24小时持续产氢过程中保持催化活性。（CoP）-(FeP)-NRs/G电催化剂的优异催化性能可能归因于其独特的介孔结构以及CoP和FeP之间的强协同效应。因此，这项工作为制备廉价且高效的电催化剂提供了一种可行的方法，作为电化学水分解中HER的基于Pt的电催化剂的替代品。
