Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (10): 1798-1807.DOI: 10.1016/S1872-2067(21)63808-1

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Controlling atomic phosphorous-mounting surfaces of ultrafine W2C nanoislands monodispersed on the carbon frameworks for enhanced hydrogen evolution

Xiangyong Zhanga, Tianying Liua, Ting Guoa, Xueying Hana, Zongyun Mua, Qiang Chenb, Jiangmin Jiangb, Jing Yanb, Jiaren Yuanc, Dezhi Wanga(), Zhuangzhi Wua(), Zongkui Koub()   

  1. aSchool of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China
    bState Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China
    cSchool of Physics and Electronic Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
  • Received:2021-02-06 Accepted:2021-03-22 Online:2021-10-18 Published:2021-06-20
  • Contact: Dezhi Wang,Zhuangzhi Wu,Zongkui Kou
  • Supported by:
    National Natural Science Foundation of China(51572301);National Key R&D Program of China(2017YFB0306000);Hunan Provincial Natural Science Foundation(2016JJ3153);Innovation-Driven Project of Central South University(502221802);Double First-class Funding Project of Central South University.

Abstract:

Controllably mounting foreign atoms on the surfaces of earth-abundant electrocatalysts strongly improve their surface electronic properties for optimizing the catalytic performance of surficial sites to an unusual level, and provides a good platform to gain deep insights into catalytic reactions. The present work describes, employing ultrafine W2C nanoislands (average size: 2.3 nm) monodispersed on the N, P dual-doped carbon frameworks as a model system, how to regulate the atomic phosphorous-mounting effect on the surfaces of W2C to derive an active and stable P-mounting W2C (WCP) catalyst for both acidic and alkaline hydrogen evolution reaction (HER). Since in situ phosphorus substitution into carbon sites of preformed W2C nanoislands gradually proceeds from surfaces to solids, so that using a proper amount of phosphorus sources can readily control the surface mounting level to avoid the mass P-doping into the bulk. By this way, the activity per active site of WCP catalyst with robust stability can be optimized to 0.07 and 0.56 H2 s-1 at -200 mV overpotential in acid and base, respectively, which reach up to the several-fold of pure-phase W2C (0.01 and 0.05 H2 s-1). Theoretical investigations suggest that compared with solid P doping, the P mounting on W2C surface can more remarkably enhance its metallicity and decrease the hydrogen release barrier. This finding disclosed a key correlation between surface foreign atom-mounting and catalytic activity, and suggested a logical extension to other earth-abundant catalysts for various catalytic reactions.

Key words: Tungsten carbide, Doping, Surficial engineering, Hydrogen evolution reaction, Electrocatalyst