Phonos does not support Chinese IPA, for example:
wikitext（IPA of "江"）:

<phonos ipa="tɕjɑŋ˥˥" text="" lang="cmn-CN" />

give error:

The generated audio appears to be empty. The given IPA may be invalid, or is not supported by the engine. Using the 'text' parameter may help.

Chinese IPA test data from IPA dictionary project.

more test see https://en.wikipedia.beta.wmflabs.org/wiki/Phonos#Chinese