Interfacial Engineering of W 2 N/WC Heterostructures Derived from Solid‐State Synthesis: A Highly Efficient Trifunctional Electrocatalyst for ORR, OER, and HER

Diao, Jinxiang; Qiu, Yu; Liu, Shuangquan; Wang, Weitao; Chen, Kai; Li, Hailong; Yuan, Wenyu; Qu, Yunteng; Guo, Xiaohui

doi:10.1002/adma.201905679

Title: Interfacial Engineering of W ₂ N/WC Heterostructures Derived from Solid‐State Synthesis: A Highly Efficient Trifunctional Electrocatalyst for ORR, OER, and HER

Journal Article · 18 November 2019 · Advanced Materials

DOI: https://doi.org/10.1002/adma.201905679 · OSTI ID:1574511

^[1]; Qiu, Yu ^[2]; Liu, Shuangquan ^[2]; Wang, Weitao ^[3]; Chen, Kai ^[4]; Li, Hailong ^[2]; Yuan, Wenyu ^[5]; Qu, Yunteng ^[6]; Guo, Xiaohui ^[2]

Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education and The College of Chemistry and Materials Science Northwest University Xi'an 710069 China, Aeronautical Polytechnic Institute Xi'an 710089 China
Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education and The College of Chemistry and Materials Science Northwest University Xi'an 710069 China
College of Chemistry and Chemical Engineering Shaanxi University of Science and Technology Xi'an Shaanxi 710021 China
Department of Materials Science and Engineering Pusan National University Busan 46241 Korea
Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN) National Institute for Materials Science (NIMS) Tsukuba 305‐0044 Japan
Department of Chemistry iChEM University of Science and Technology of China Hefei 230026 China

Abstract To meet the practical demand of overall water splitting and regenerative metal–air batteries, highly efficient, low‐cost, and durable electrocatalysts for the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) are required to displace noble metal catalysts. In this work, a facile solid‐state synthesis strategy is developed to construct the interfacial engineering of W ₂ N/WC heterostructures, in which abundant interfaces are formed. Under high temperature (800 °C), volatile CN _x species from dicyanodiamide are trapped by WO ₃ nanorods, followed by simultaneous nitridation and carbonization, to form W ₂ N/WC heterostructure catalysts. The resultant W ₂ N/WC heterostructure catalysts exhibit an efficient and stable electrocatalytic performance toward the ORR, OER, and HER, including a half‐wave potential of 0.81 V (ORR) and a low overpotential at 10 mA cm ⁻² for the OER (320 mV) and HER (148.5 mV). Furthermore, a W ₂ N/WC‐based Zn–air battery shows outstanding high power density (172 mW cm ⁻² ). Density functional theory and X‐ray absorption fine structure analysis computations reveal that W ₂ N/WC interfaces synergistically facilitate transport and separation of charge, thus accelerating the electrochemical ORR, OER, and HER. This work paves a novel avenue for constructing efficient and low‐cost electrocatalysts for electrochemical energy devices.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1574511

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 7 Vol. 32; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Title: Interfacial Engineering of W ₂ N/WC Heterostructures Derived from Solid‐State Synthesis: A Highly Efficient Trifunctional Electrocatalyst for ORR, OER, and HER