Wu Tianli, Pi Mingyu, Wang Xiaodeng, Zhang Dingke, Chen Shijian
School of Physics, Chongqing University, Shapingba, Chongqing 401331, P. R. China.
College of Physics and Electronic Engineering, Chongqing Normal University, Shapingba, Chongqing 401331, P. R. China.
Phys Chem Chem Phys. 2017 Jan 18;19(3):2104-2110. doi: 10.1039/c6cp07294a.
Developing low-cost and highly-efficient non-precious metal bifunctional electrocatalysts towards the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is an attractively alternative strategy to solve the environmental pollution problems and energy demands. In this study, metal-organic framework (MOF) derived porous cobalt poly-phosphide (CoP) concave polyhedrons are prepared and explored as superior bifunctional electrocatalysts for the HER and OER. The prepared MOF derived CoP concave polyhedrons show excellent electrocatalytic activity and stability towards the HER and OER in both acidic and alkaline media, with the Tafel slopes of 53 mV dec and 76 mV dec and a current density of 10 mA cm at the overpotentials of -78 and 343 mV for the HER and OER, respectively, which are remarkably superior to those of the transition metal phosphides (TMPs) and comparable to those of the commercial precious metal catalysts. In addition, they also offer efficient catalytic activities and durabilities under neutral and basic conditions for the HER. The results of our study may shed light on the direction towards highly efficient bifunctional TMP electrocatalysts with high phosphorous component.
开发低成本、高效的非贵金属双功能电催化剂用于析氢反应（HER）和析氧反应（OER）是解决环境污染问题和能源需求的一种极具吸引力的替代策略。在本研究中，制备了金属有机框架（MOF）衍生的多孔钴多磷化物（CoP）凹面体，并将其作为HER和OER的优异双功能电催化剂进行探索。所制备的MOF衍生CoP凹面体在酸性和碱性介质中对HER和OER均表现出优异的电催化活性和稳定性，HER和OER的塔菲尔斜率分别为53 mV dec和76 mV dec，在过电位为-78和343 mV时的电流密度分别为10 mA cm，显著优于过渡金属磷化物（TMPs），与商业贵金属催化剂相当。此外，它们在中性和碱性条件下对HER也具有高效的催化活性和耐久性。我们的研究结果可能为开发具有高磷含量的高效双功能TMP电催化剂指明方向。
