Kim Dokyoung, Park Jinkyu, Lee Jinwoo, Zhang Zhuo, Yong Kijung
Surface Chemistry Laboratory of Electronic Materials, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea.
Advanced Functional Nanomaterial Laboratory, Department of Chemical Engineering, Korea Advanced Institute of Science and Technology (KASIT), Daejeon, 34051, Republic of Korea.
ChemSusChem. 2018 Oct 24;11(20):3618-3624. doi: 10.1002/cssc.201801733. Epub 2018 Sep 21.
The development of efficient non-noble-metal hydrogen evolution electrocatalysts in alkaline media is crucial for sustainable, ecofriendly production of H through water electrolysis. An alkaline hydrogen evolution reaction (HER) catalyst composed of Ni(OH) -decorated thungsten phosphide (WP) nanorod arrays on carbon paper was synthesized by thermal evaporation and electrodeposition. This hybrid catalyst displayed outstanding HER activity and required a low overpotential of only 77 mV to obtain a current density of 10 mA cm and a Tafel slope of 71 mV dec . The hybrid catalyst also showed long-term electrochemical stability, maintaining its activity for 18 h. This improved HER efficiency was attributed to the synergetic effect of WP and Ni(OH) : Ni(OH) effectively lowers the energy barrier during water dissociation and also provides active sites for hydroxyl adsorption, whereas WP adsorbs hydrogen intermediates and efficiently produces H gas. This interfacial cooperation offers not only excellent HER catalytic activity but also new strategies for the fabrication of effective non-noble-metal-based electrocatalysts in alkaline media.
在碱性介质中开发高效的非贵金属析氢电催化剂对于通过水电解可持续、环保地生产氢气至关重要。通过热蒸发和电沉积合成了一种由装饰有Ni(OH)的磷化钨（WP）纳米棒阵列组成的碱性析氢反应（HER）催化剂，该催化剂负载于碳纸上。这种混合催化剂表现出出色的HER活性，仅需77 mV的低过电位即可获得10 mA cm的电流密度，塔菲尔斜率为71 mV dec。该混合催化剂还表现出长期的电化学稳定性，其活性可维持18 h。HER效率的提高归因于WP和Ni(OH)的协同效应：Ni(OH)有效地降低了水离解过程中的能垒，还为羟基吸附提供了活性位点，而WP吸附氢中间体并有效地产生氢气。这种界面协同作用不仅提供了出色的HER催化活性，还为在碱性介质中制备有效的非贵金属基电催化剂提供了新策略。
