Kang Qiaoling, Li Mengyuan, Shi Jiangwei, Lu Qingyi, Gao Feng
State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China.
Department of Materials Science and Engineering, Jiangsu Key Laboratory of Artificial Functional Materials, Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, P. R. China.
ACS Appl Mater Interfaces. 2020 Apr 29;12(17):19447-19456. doi: 10.1021/acsami.0c00795. Epub 2020 Apr 14.
Exploring cost-effective and general approaches for highly active and stable bifunctional transition metal phosphide (TMP) electrocatalysts towards overall water splitting is greatly desirable and challenging. Herein, a general strategy combining sol-gel and a carbonization-assisted route was proposed to facilely fabricate a series of TMP nanoparticles, including CoP, MoP, FeP, CuP, NiP, PtP, FeNiP, CoNiP, and FeCoNiP, coupled in an amorphous carbon matrix with one-step carbon composite formation. The resultant NiFeP@C exhibits excellent activities as a bifunctional electrocatalyst toward oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) with low overpotentials of 260 and 160 mV, respectively, at 10 mA/cm in 1 M KOH solution. With the NiFeP@C electrocatalyst as both electrode materials, an integrated electrolyzer can deliver 47.0 mA/cm of current density at 1.60 V, better than the assembled Pt/C20∥IrO counterpart. The encapsulation of NiFeP nanoparticles in the carbon matrix effectively prevents their corrosion and leads to almost unfading catalytic activities for more than 20 h for either the HER, OER, or overall water splitting, outperforming recently reported bifunctional electrocatalysts. The coexistence of Ni, Fe, P, and C would have synergetic effects to accelerate charge transfer and promote electrocatalytic activity. This universal strategy for TMP-based composites opens up a new avenue to explore TMPs as multifunctional materials for various applications.
探索具有高活性和稳定性的双功能过渡金属磷化物（TMP）电催化剂用于全水分解的经济高效且通用的方法极具吸引力但也具有挑战性。在此，我们提出了一种结合溶胶 - 凝胶法和碳化辅助路线的通用策略，以简便地制备一系列TMP纳米颗粒，包括CoP、MoP、FeP、CuP、NiP、PtP、FeNiP、CoNiP和FeCoNiP，通过一步法形成与非晶碳基质耦合的碳复合材料。所得的NiFeP@C作为双功能电催化剂对析氧反应（OER）和析氢反应（HER）表现出优异的活性，在1 M KOH溶液中，在10 mA/cm²时过电位分别低至260和160 mV。以NiFeP@C电催化剂作为电极材料，集成电解槽在1.60 V时可提供47.0 mA/cm²的电流密度，优于组装的Pt/C||IrO₂对应物。将NiFeP纳米颗粒封装在碳基质中有效地防止了它们的腐蚀，并导致HER、OER或全水分解的催化活性在超过20小时内几乎不衰减，优于最近报道的双功能电催化剂。Ni、Fe、P和C的共存将产生协同效应，加速电荷转移并促进电催化活性。这种基于TMP的复合材料的通用策略为探索TMP作为多功能材料用于各种应用开辟了一条新途径。
